Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.bbrc.2023.149412

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ23-0524

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

AIMS: In our previously reported randomized controlled trial in patients with noninsulin-treated type 2 diabetes, the use of flash glucose monitoring (FGM) improved glycated hemoglobin (HbA1c), and the improvement was sustained after the cessation of glucose monitoring. In this post-hoc analysis, we examined data from our trial to identify the factors that influenced FGM efficacy. METHODS: We analyzed data for 48 of 49 participants of the FGM group who completed the trial to clarify the changes in various parameters and factors related to HbA1c improvement with the use of FGM. RESULTS: Analyses of the FGM data during the 12-week FGM provision period showed that the weekly mean blood glucose levels considerably decreased as early as at 1 week compared with the baseline values, and this decline continued for 12 weeks. An enhancement in the Diabetes Treatment Satisfaction Questionnaire regarding "willingness to continue the current treatment" score was significantly associated with the improvement in HbA1c at 12 (p = 0.009) and 24 weeks (p = 0.012). CONCLUSIONS: Glycemic control was improved soon after FGM initiation, accompanied by improved satisfaction with continuation of the current treatment in patients with noninsulin-treated type 2 diabetes.

DOI： 10.1016/j.pcd.2023.09.009

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1210/clinem/dgad231

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Pituitary organoids are promising graft sources for transplantation in treatment of hypopituitarism. Building on development of self-organizing culture to generate pituitary-hypothalamic organoids (PHOs) using human pluripotent stem cells (hPSCs), we established techniques to generate PHOs using feeder-free hPSCs and to purify pituitary cells. The PHOs were uniformly and reliably generated through preconditioning of undifferentiated hPSCs and modulation of Wnt and TGF-β signaling after differentiation. Cell sorting using EpCAM, a pituitary cell-surface marker, successfully purified pituitary cells, reducing off-target cell numbers. EpCAM-expressing purified pituitary cells reaggregated to form three-dimensional pituitary spheres (3D-pituitaries). These exhibited high adrenocorticotropic hormone (ACTH) secretory capacity and responded to both positive and negative regulators. When transplanted into hypopituitary mice, the 3D-pituitaries engrafted, improved ACTH levels, and responded to in vivo stimuli. This method of generating purified pituitary tissue opens new avenues of research for pituitary regenerative medicine.

DOI： 10.1016/j.stemcr.2023.05.002

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)  

Hyperglycemia impairs immune response; however, it remains unknown whether the anti-tumor effects of anti-programmed cell death-1 antibody (PD-1-Ab) treatment are changed in hyperglycemic conditions. We analyzed the effect of PD-1-Ab on tumor growth in streptozotocin-induced diabetic mice (STZ-mice) subcutaneously inoculated with MC38 (a colon carcinoma cell line). Furthermore, we assessed the expression of chemokines by polymerase chain reaction (PCR) array in tumor-draining lymph nodes (dLNs) of these mice and MC38 cells cultured in different glucose concentrations. The suppressive effect of PD-1-Ab on tumor growth was attenuated. This was accompanied by fewer tumor-infiltrating CD8+ T cells, and STZ-mice had fewer tumor-infiltrating CD11c+ dendritic cells (DCs) than normoglycemic mice. mRNA expression levels of CXCL9, a chemokine recruiting CD8+ T cells, were lower in dLNs of STZ-mice than in normoglycemic mice after PD-1-Ab treatment, and its protein was expressed in DCs. In MC38 cells cultured with 25 mM glucose, mRNA expression of CCL7, a chemokine recruiting DCs, was decreased compared to cells cultured with 5 mM glucose. These results suggest that the STZ-induced hyperglycemia impairs the effect of PD-1-Ab treatment on MC38 tumor growth, and is accompanied by reduced infiltration of DCs and CD8+ T cells and decreased expression of CCL7 and CXCL9.

DOI： 10.1038/s41598-023-33049-7

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

When damaged, restoring the function of the hypothalamus is currently impossible. It is unclear whether neural stem cells exist in the hypothalamus. Studies have reported that adult rodent tanycytes around the third ventricle function as hypothalamic neural stem cell-like cells. However, it is currently impossible to collect periventricular cells from humans. We attempted to generate hypothalamic neural stem cell-like cells from human embryonic stem cells (ESCs). We focused on retina and anterior neural fold homeobox (RAX) because its expression is gradually restricted to tanycytes during the late embryonic stage. We differentiated RAX::VENUS knockin human ESCs (hESCs) into hypothalamic organoids and sorted RAX+ cells from mature organoids. The isolated RAX+ cells formed neurospheres and exhibited self-renewal and multipotency. Neurogenesis was observed when neurospheres were transplanted into the mouse hypothalamus. We isolated RAX+ hypothalamic neural stem cell-like cells from wild-type human ES organoids. This is the first study to differentiate human hypothalamic neural stem cell-like cells from pluripotent stem cells.

DOI： 10.1016/j.stemcr.2023.02.006

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3389/fimmu.2023.1165004

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本糖尿病学会  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3389/fendo.2023.1130465

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

OBJECTIVE: Resting energy expenditure (REE) decreases if there is reduced energy intake and body weight (BW). The decrease in REE could make it difficult for patients with obesity to maintain decreased BW. This study aimed to investigate the correlation among changes in REE, energy intake, and BW during the weight loss process in patients with obesity. MATERIALS AND METHODS: We conducted a retrospective cohort study of patients hospitalized for the treatment of obesity in Japan. Patients received fully controlled diet during hospitalization and performed exercises if able. REE was measured once a week using a hand-held indirect calorimetry. Energy intake was determined by actual dietary intake. RESULTS: Of 44 inpatients with obesity, 17 were included in the analysis. Their BW decreased significantly after 1 week (-4.7 ± 2.0 kg, P < 0.001) and 2 weeks (-5.7 ± 2.2 kg, P < 0.001). The change in REE after 1 and 2 weeks was positively correlated with the energy intake/energy expenditure ratio (r = 0.66, P = 0.004 at 1 week, r = 0.71, P = 0.002 at 2 weeks). Using a regression equation (y = 0.5257x - 43.579), if the energy intake/energy expenditure ratio within the second week was 82.9%, the REE after 2 weeks was similar to the baseline level. There was no significant correlation between the change in REE and BW. CONCLUSION: Our data suggest that changes in REE depend on energy intake/energy expenditure ratio and that the decrease in REE can be minimized by matching energy intake to energy expenditure, even during the weight loss process.

DOI： 10.20945/2359-3997000000532

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1530/EDM-22-0305

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Arginine vasopressin (AVP) is expressed in both magnocellular (magnAVP) and parvocellular AVP (parvAVP) neurons of the paraventricular nucleus, and AVP colocalizes with corticotropin-releasing hormone (CRH) only in the parvocellular neurons. The immunoglobulin heavy chain binding protein (BiP) is a major endoplasmic reticulum (ER) chaperone which regulates the unfolded protein response under ER stress. We previously demonstrated that knockdown of BiP in magnAVP neurons exacerbated ER stress, which resulted in the autophagy-associated cell death of magnAVP neurons. Using the same approach, in the present study we examined the role of BiP in mouse parvAVP/CRH neurons. Our data demonstrate that BiP is expressed in mouse parvAVP/CRH neurons under nonstress conditions and is upregulated in proportion to the increase in CRH expression after adrenalectomy. For BiP knockdown in parvAVP/CRH neurons, we utilized a viral approach in combination with shRNA interference. Knockdown of BiP expression induced ER stress in parvAVP/CRH neurons, as reflected by the expression of C/EBP homologous protein. Furthermore, BiP knockdown led to the loss of parvAVP/CRH neurons after 4 weeks. In summary, our results demonstrate that BiP plays a pivotal role in parvAVP/CRH neurons, which function as neuroendocrine cells producing a large number of secretory proteins.

DOI： 10.1111/jne.13223

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Arginine vasopressin (AVP) is an antidiuretic hormone synthesized principally in the hypothalamic supraoptic and paraventricular nuclei. The immunoglobulin heavy chain binding protein (BiP), one of the most abundant endoplasmic reticulum (ER) chaperones, is highly expressed in AVP neurons, even under basal conditions. Moreover, its expression is upregulated in proportion to the increase in AVP expression under dehydration. These data suggest that AVP neurons are constantly exposed to ER stress. BiP knockdown in AVP neurons induces ER stress and autophagy, resulting in AVP neuronal loss, indicating that BiP is pivotal in maintaining the AVP neuron system. Furthermore, inhibition of autophagy after BiP knockdown exacerbates AVP neuronal loss, suggesting that autophagy induced under ER stress is a protective cellular mechanism by which AVP neurons cope with ER stress. Familial neurohypophysial diabetes insipidus (FNDI) is an autosomal dominant disorder caused by mutations in the AVP gene. It is characterized by delayed-onset progressive polyuria and eventual AVP neuronal loss. In AVP neurons of FNDI model mice, mutant protein aggregates are confined to a specific compartment of the ER, called the ER-associated compartment (ERAC). The formation of ERACs contributes to maintaining the function of the remaining intact ER, and mutant protein aggregates in ERACs undergo autophagic-lysosomal degradation without isolation or translocation from the ER, representing a novel protein degradation system in the ER.

DOI： 10.1507/endocrj.EJ23-0193

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ23-0256

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s11102-022-01276-2

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

The symptoms of diabetes insipidus may be masked by the concurrence of adrenal insufficiency and emerge after the administration of hydrocortisone, occasionally at high doses. To elucidate the mechanism underlying polyuria induced by the administration of high-dose corticosteroids in the deficiency of arginine vasopressin (AVP), we first examined the secretion of AVP in three patients in whom polyuria was observed only after the administration of high-dose corticosteroids. Next, we examined the effects of dexamethasone or aldosterone on water balance in wild-type and familial neurohypophysial diabetes insipidus (FNDI) model mice. A hypertonic saline test showed that AVP secretion was partially impaired in all patients. In one patient, there were no apparent changes in AVP secretion before and after the administration of high-dose corticosteroids. In FNDI mice, unlike dexamethasone, the administration of aldosterone increased urine volumes and decreased urine osmolality. Immunohistochemical analyses showed that, after the administration of aldosterone in FNDI mice, aquaporin-2 expression was decreased in the apical membrane and increased in the basolateral membrane in the collecting duct. These changes were not observed in wild-type mice. The present data suggest that treatment with mineralocorticoids induces polyuria by reducing aquaporin-2 expression in the apical membrane of the kidney in partial AVP deficiency.

DOI： 10.1507/endocrj.EJ22-0339

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ20220831

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1210/clinem/dgac547

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1530/EC-22-0378

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1530/EJE-22-0751

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.20945/2359-3997000000528

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本医療情報学会  

Language：English   Publishing type：Research paper (scientific journal)  

Familial neurohypophyseal diabetes insipidus (FNDI) is a degenerative disease of vasopressin (AVP) neurons. Studies in mouse in vivo models indicate that accumulation of mutant AVP prehormone is associated with FNDI pathology. However, studying human FNDI pathology in vivo is technically challenging. Therefore, an in vitro human model needs to be developed. When exogenous signals are minimized in the early phase of differentiation in vitro, mouse embryonic stem cells (ESCs)/induced pluripotent stem cells (iPSCs) differentiate into AVP neurons, whereas human ESCs/iPSCs die. Human ESCs/iPSCs are generally more similar to mouse epiblast stem cells (mEpiSCs) compared to mouse ESCs. In this study, we converted human FNDI-specific iPSCs by the naive conversion kit. Although the conversion was partial, we found improved cell survival under minimal exogenous signals and differentiation into rostral hypothalamic organoids. Overall, this method provides a simple and straightforward differentiation direction, which may improve the efficiency of hypothalamic differentiation.

DOI： 10.1038/s41598-022-22405-8

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/cen.14819

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1159/000527139

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Thyroid dysfunction is frequently caused by treatment with anti-programmed cell death-1 ligand 1 antibodies (PD-L1-Abs) as well as anti-cancer drugs, including ramucirumab (RAM) and multi-targeted tyrosine kinase inhibitors (multi-TKIs), which are often used prior to PD-L1-Ab treatment in cancer patients. METHODS: A total of 148 patients treated with PD-L1-Abs were evaluated for anti-thyroid antibodies at baseline and for thyroid function every six weeks for 24 weeks after treatment initiation and then were observed until the visits stopped. RESULTS: Of the 148 patients, 15 (10.1%) developed thyroid dysfunction after PD-L1-Ab treatment (destructive thyroiditis in eight and hypothyroidism without preceding thyrotoxicosis in seven). The prevalences of an elevated thyroid-stimulating hormone (TSH) level at baseline (3/15 [20.0%] vs. 4/133 [3.0%], p < 0.05), positive anti-thyroglobulin antibodies (TgAb) at baseline (4/15 [26.7%] vs. 5/133 [3.8%], p < 0.05) and prior treatment with RAM or multi-TKIs (3/15 [20.0%] vs. 5/133 [3.8%], p < 0.05) were significantly higher in patients with versus without thyroid dysfunction. In a multivariate analysis, elevated TSH level at baseline, TgAb positivity at baseline and prior treatment with RAM or multi-TKIs were significantly associated with the development of thyroid dysfunction, with odds ratios of 7.098 (95% confidence interval [CI], 1.154-43.638), 11.927 (95% CI, 2.526-56.316) and 8.476 (95% CI, 1.592-45.115), respectively. CONCLUSIONS: The results of this real-world study suggest that the risk of thyroid dysfunction induced by PD-L1-Abs can be predicted by the TSH level at baseline, TgAb positivity at baseline and prior treatment with RAM or multi-TKIs.

DOI： 10.1210/clinem/dgac467

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Binge eating is a characteristic symptom observed in obese individuals that is related to dysfunction of dopaminergic neurons (DNs). Intermittent administration of a high-fat diet (HFD) is reported to induce binge-like eating, but the underlying mechanisms remain unclear. We generated dopaminergic neuron specific IKKβ deficient mice (KO) to examine the effects of inflammation in DNs on binge-like eating under inflammatory conditions associated with HFD. After administration of HFD for 4 weeks, mice were fasted for 24 h, and then the consumption of HFD was measured for 2 h. We also evaluated that the mRNA expressions of inflammatory cytokines, glial markers, and dopamine signaling-related genes in the ventral tegmental area (VTA) and striatum. Moreover, insulin was administered intraventricularly to assess downstream signaling. The consumption of HFD was significantly reduced, and the phosphorylation of AKT in the VTA was significantly increased in female KO compared to wild-type (WT) mice. Analyses of mRNA expressions revealed that DNs activity and inflammation in the VTA were significantly decreased in female KO mice. Thus, our data suggest that HFD-induced inflammation with glial cell activation in the VTA affects DNs function and causes abnormal eating behaviors accompanied by insulin resistance in the VTA of female mice.

DOI： 10.3390/nu14183835

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Leptin, a hormone secreted by adipocytes, exhibits therapeutic potential for the treatment of insulin-dependent diabetes mellitus (IDDM). Protein tyrosine phosphatase 1B (PTP1B) is a key enzyme that negatively regulates leptin receptor signaling. Here, the role of PTP1B in the treatment of IDDM was investigated using PTP1B deficient (KO) mice and a PTP1B inhibitor. IDDM wild-type (WT) mice induced by streptozotocin showed marked hyperglycemia compared to non-IDDM WT mice. KO mice displayed significantly improved glucose metabolism equivalent to non-IDDM WT mice, whereas peripheral or central administration of leptin partially improved glucose metabolism in IDDM WT mice. Peripheral combination therapy of leptin and a PTP1B inhibitor in IDDM WT mice improved glucose metabolism to the same level as non-IDDM WT mice. Leptin was shown to act on the arcuate nucleus in the hypothalamus to suppress gluconeogenesis in liver and enhance glucose uptake in both brown adipose tissue and soleus muscle via the sympathetic nervous system. These effects were enhanced by PTP1B deficiency. Thus, treatment of IDDM with leptin, PTP1B deficiency or a PTP1B inhibitor was shown to enhance leptin activity in the hypothalamus to improve glucose metabolism. These findings suggest a potential alternative therapy for IDDM.

DOI： 10.2337/db21-0953

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Pituitary adenomas are characterized by abnormal growth in the pituitary gland. Surgical excision is the first-line treatment for functional (hormone-producing) pituitary adenomas, except for prolactin-producing adenomas; however, complete excision is technically challenging, and many patients require long-term medication after the treatment. In addition, the pathophysiology of pituitary adenomas, such as tumorigenesis, has not been fully understood. Pituitary adenoma pathophysiology has mainly been studied using animal models and animal tumor-derived cell lines. Nevertheless, experimental studies on human pituitary adenomas are difficult because of the significant differences among species and the lack of reliable cell lines. Recently, several methods have been established to differentiate pituitary cells from human pluripotent stem cells (hPSCs). The induced pituitary hormone-producing cells retain the physiological properties already lost in tumor-derived cell lines. Moreover, CRISPR/Cas9 systems have expedited the introduction of causative gene mutations in various malignant tumors into hPSCs. Therefore, hPSC-derived pituitary cells have great potential as a novel platform for studying the pathophysiology of human-specific pituitary adenomas and developing novel drugs. This review presents an overview of the recent progresses in hPSC applications for pituitary research, functional pituitary adenoma pathogenesis, and genome-editing techniques for introducing causative mutations. We also discuss future applications of hPSCs for studying pituitary adenomas.

DOI： 10.3390/cancers14153660

Web of Science

Scopus

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3389/fendo.2022.941166

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.bbrc.2022.04.038

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.beem.2022.101660

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Previous studies showed that although the risk of thyroid dysfunction [thyroid immune-related adverse events (irAEs)] induced by anti-programmed cell death-1 antibodies (PD-1-Ab) was as low as 2% to 7% in patients negative for anti-thyroid antibodies (ATAs) at baseline, it was much higher (30%-50%) in patients positive for ATAs. However, whether a similar increase occurs with combination therapy using PD-1-Ab plus anti-cytotoxic T-lymphocyte antigen-4 antibody (CTLA-4-Ab) is unknown. METHODS: A total of 451 patients with malignancies treated with PD-1-Ab, CTLA-4-Ab, or a combination of PD-1-Ab and CTLA-4-Ab (PD-1/CTLA-4-Abs) were evaluated for ATAs at baseline and for thyroid function every 6 weeks for 24 weeks after treatment initiation and then observed until the last clinical visit. RESULTS: Of the 451 patients, 51 developed thyroid irAEs after immunotherapy [41 of 416 (9.9%) treated with PD-1-Ab, 0 of 8 (0%) treated with CTLA-4-Ab, and 10 of 27 (37.0%) treated with PD-1/CTLA-4-Abs]. The cumulative incidence of thyroid irAEs was significantly higher in patients who were positive vs negative for ATAs at baseline after both PD-1-Ab [28/87 (32.2%) vs 13/329 (4.0%), P < 0.001] and PD-1/CTLA-4-Abs [6/10 (60.0%) vs 4/17 (23.5%), P < 0.05] treatments. The risk of thyroid irAEs induced by PD-1/CTLA-4Abs, which was significantly higher than that induced by PD-1-Ab, in patients negative for ATAs at baseline was not statistically different from that induced by PD-1-Ab in patients positive for ATAs at baseline. CONCLUSIONS: This study showed that the incidence of thyroid irAEs was high and not negligible after PD-1/CTLA-4-Abs treatment even in patients negative for ATAs at baseline.

DOI： 10.1210/clinem/dgab829

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Prolactin (PRL), a hormone involved in lactation, is mainly produced and secreted by the lactotrophs of the anterior pituitary (AP) gland. We previously reported a method to generate functional adrenocorticotropic hormone-producing cells by differentiating the AP and hypothalamus simultaneously from human induced pluripotent stem cells (iPSCs). However, PRL-producing cells in the induced AP have not been investigated. Here, we confirmed the presence of PRL-producing cells and evaluated their endocrine functions. We differentiated pituitary cells from human iPSCs using serum-free floating culture of embryoid-like aggregates with quick reaggregation (SFEB-q) method and evaluated the appearance and function of PRL-producing cells. Secretion of PRL from the differentiated aggregates was confirmed, which increased with further culture. Fluorescence immunostaining and immunoelectron microscopy revealed PRL-producing cells and PRL-positive secretory granules, respectively. PRL secretion was promoted by various prolactin secretagogues such as thyrotropin-releasing hormone, vasoactive intestinal peptide, and prolactin-releasing peptide, and inhibited by bromocriptine. Moreover, the presence of tyrosine hydroxylase-positive dopaminergic nerves in the hypothalamic tissue area around the center of the aggregates connecting to PRL-producing cells indicated the possibility of recapitulating PRL regulatory mechanisms through the hypothalamus. In conclusion, we generated pituitary lactotrophs from human iPSCs; these displayed similar secretory responsiveness as human pituitary cells in vivo. In the future, this is expected to be used as a model of human PRL-producing cells for various studies, such as drug discovery, prediction of side effects, and elucidation of tumorigenic mechanisms using disease-specific iPSCs. Furthermore, it may help to develop regenerative medicine for the pituitary gland.

DOI： 10.1210/endocr/bqac004

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本肥満学会  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3803/EnM.2021.1282

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00125-021-05610-4

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.RMK69-08

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1172/jci.insight.142464

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

AIMS/HYPOTHESIS: Patients with GAD antibodies (GADAb) showing clinical features of type 2 diabetes typically exhibit progression to an insulin-dependent state in several months or years. This condition is diagnosed as slowly progressive insulin-dependent (type 1) diabetes mellitus (SPIDDM) or latent autoimmune diabetes in adults, a subtype of adult-onset autoimmune diabetes. However, some patients diagnosed with adult-onset autoimmune diabetes do not progress to an insulin-dependent state. We conducted a retrospective cohort study to identify patients with non-insulin-dependent diabetes among those diagnosed with adult-onset autoimmune diabetes using measurable indicators in routine clinical practice. METHODS: We surveyed data from the electronic medical records of all patients with GADAb from eight medical centres in Japan for selecting and analysing patients who matched the diagnostic criteria of SPIDDM. RESULTS: Overall, 345 patients were analysed; of these, 162 initiated insulin therapy (insulin therapy group), whereas 183 did not (non-insulin therapy group) during the follow-up period (median 3.0 years). Patients in the non-insulin therapy group were more likely to be male and presented a later diabetes onset, shorter duration of diabetes, higher BMI, higher blood pressure levels, lower HbA1c levels, lower GADAb levels and lesser antidiabetic agent use than those in the insulin therapy group when GADAb was first identified as positive. A Cox proportional hazards model showed that BMI, HbA1c levels and GADAb levels were independent factors for progression to insulin therapy. Kaplan-Meier analyses revealed that 86.0% of the patients with diabetes having GADAb who presented all three factors (BMI ≥ 22 kg/m2, HbA1c < 75 mmol/mol [9.0%] and GADAb <10.0 U/ml) did not require insulin therapy for 4 years. CONCLUSIONS/INTERPRETATION: Higher BMI (≥22 kg/m2), lower HbA1c (<75 mmol/mol [9.0%]) and lower GADAb levels (<10.0 U/ml) can predict a non-insulin-dependent state for at least several years in Japanese patients with diabetes having GADAb.

DOI： 10.1007/s00125-021-05516-1

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Previous studies suggest that signaling by the gamma-aminobutyric acid (GABA) type B receptor (GABABR) is involved in the regulation of binge eating, a disorder which might contribute to the development of obesity. Here, we show that intermittent access to a high fat diet (HFD) induced binge-like eating behavior with activation of dopamine receptor d1 (drd1)-expressing neurons in the caudate putamen (CPu) and nucleus accumbens (NAc) in wild-type (WT) mice. The activation of drd1-expressing neurons during binge-like eating was substantially increased in the CPu, but not in the NAc, in corticostriatal neuron-specific GABABR-deficient knockout (KO) mice compared to WT mice. Treatment with the GABABR agonist, baclofen, suppressed binge-like eating behavior in WT mice, but not in KO mice, as reported previously. Baclofen also suppressed the activation of drd1-expressing neurons in the CPu, but not in the NAc, during binge-like eating in WT mice. Thus, our data suggest that GABABR signaling in CPu neurons expressing drd1 suppresses binge-like consumption during a HFD in mice.

DOI： 10.1038/s41598-021-98590-9

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Wolfram syndrome (WS) is mainly caused by mutations in the WFS1 gene and characterized by diabetes mellitus, optic atrophy, hearing loss, and central diabetes insipidus (CDI). WFS1 is an endoplasmic reticulum (ER)-resident transmembrane protein, and Wfs1 knockout (Wfs1-/-) mice, which have been used as a mouse model for WS, reportedly manifested impairment of glucose tolerance due to pancreatic β-cell loss. In the present study, we examined water balance, arginine vasopressin (AVP) secretion, and ER stress in AVP neurons of the hypothalamus in Wfs1-/- mice. There were no differences in urine volumes between Wfs1-/- and wild-type mice with free access to water. Conversely, when mice were subjected to intermittent water deprivation (WD) for 20 weeks, during which water was unavailable for 2 days a week, urine volumes were larger in Wfs1-/- mice, accompanied by lower urine AVP concentrations and urine osmolality, compared to wild-type mice. The mRNA expression of immunoglobulin heavy chain binding protein, a marker of ER stress, was significantly increased in the supraoptic nucleus and paraventricular nuclei in Wfs1-/- mice compared to wild-type mice after WD. Our results thus showed that Wfs1 knockout leads to a decrease in AVP secretion during dehydration, which could explain in part the mechanisms by which Wfs1 mutations cause CDI in humans.

DOI： 10.1007/s11102-021-01135-6

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/dme.14607

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ20-0707

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

The reward system, which consists of dopaminergic neurons projecting from the ventral tegmental area (VTA) to the nucleus accumbens and caudate-putamen in the striatum, has an important role in the pathogenesis of not only drug addiction but also diet-induced obesity. In the present study, we examined whether signaling through glucocorticoid receptors (GRs) in the reward system affects the rewarding value of a high-fat diet (HFD). To do so, we generated mice that lack functional GRs specifically in dopaminergic neurons (D-KO mice) or corticostriatal neurons (CS-KO mice), subjected the mice to caloric restriction stress conditions, and evaluated the rewarding value of a HFD by conditioned place preference (CPP) test. Caloric restriction induced increases in serum corticosterone to similar levels in all genotypes. While CS-KO as well as WT mice exhibited a significant preference for HFD in the CPP test, D-KO mice exhibited no such preference. There were no differences between WT and D-KO mice in consumption of HFD after fasting or cognitive function evaluated by a novel object recognition test. These data suggest that glucocorticoid signaling in the VTA increases the rewarding value of a HFD under restricted caloric stress.

DOI： 10.1038/s41598-021-92386-7

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

INTRODUCTION: Dysphagia is a common symptom that occurs in patients with diabetes mellitus (DM). There have been few prospective observational studies on esophageal motility disorders in DM using high-resolution manometry (HRM). This study aimed to clarify the characteristics of esophageal motility disorders using HRM in patients with dysphagia and compare them between DM and non-DM patients. METHODS: Patients with dysphagia were prospectively recruited between October 2018 and July 2019. Patients (n = 89) underwent esophagogastroduodenoscopy and HRM and completed the Gastrointestinal Symptom Rating Scale (GSRS) questionnaire. Manometry parameters and motility disorder classifications were compared between DM and non-DM patients. We also investigated the differences in clinical backgrounds and questionnaire scores among DM patients with normal and abnormal manometry results. RESULTS: A higher prevalence of esophageal motility disorder was observed in DM patients (60%, 21/35) compared to non-DM patients (29.6%, 16/54) (p = 0.001). The prevalence of minor disorders such as ineffective esophageal motor disorder and fragmented peristalsis was significantly higher (45 vs. 11%), and the distal contractile integral, integrated relaxation pressure, and contractile front velocity values were lower in the DM group. Among DM patients, those with abnormal esophageal motility had a significantly higher prevalence of neuropathy, retinopathy, and nephropathy, as well as higher reflux or constipation scores on the GSRS, than those with normal results. CONCLUSIONS: Among patients with dysphagia, the frequency of minor esophageal motility disorders was higher in DM patients than in non-DM patients. Abnormal esophageal motility related to poor esophageal clearance was associated with higher prevalence of diabetic complications.

DOI： 10.1159/000510081

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(株)メディカル・サイエンス・インターナショナル  

＜文献概要＞key point 中枢性尿崩症 ▼尿崩症を疑うきっかけの多くは多尿であるが,頻尿との判別に注意する。▼多尿の症例では尿浸透圧を評価し,低浸透圧尿であれば,内分泌専門医へ紹介する。▼デスモプレシン(経鼻製剤または経口製剤)による治療が開始され,その管理を内分泌専門医から引き継いだ場合,薬効が切れて尿量が増加する時間帯を適宜設けさせ,過量投与による水中毒の発生を回避する。特に渇感障害を合併する症例は管理が難しく,毎日の体重測定が投与量調整に有効である。抗利尿ホルモン分泌過剰症(SIADH) ▼SIADHを疑うきっかけは,主に低ナトリウム血症であり,無症状のことが多いが,重症例や急速進行例では倦怠感などの症状を呈することがある。▼水分制限を実施しても低ナトリウム血症が改善しない症例は,内分泌専門医に紹介する。▼内分泌専門医からトルバプタンによる治療を引き継いだ場合,状況に合わせた飲水方針を決定したうえで,血清ナトリウム値の定期フォローを行う。

Language：English   Publishing type：Research paper (scientific journal)  

The programmed cell death 1 (PD-1)/programmed cell death 1 ligand 1 (PD-L1) axis is vital for immune resistance during tumor development, while PD-L1 inhibitors can also inhibit the PD-L1/B7-1 (CD80) interaction, indicating one of the molecular differences between PD-1 and PD-L1 inhibitors. However, the clinical benefits of PD-L1 inhibitors in patients previously treated with PD-1 inhibitors remain unknown. In this study, we retrospectively analyzed the clinical data of eight patients with non-small cell lung cancer who received the PD-L1 inhibitor atezolizumab and previously treated with the PD-1 inhibitor nivolumab. The median progression-free survival was 2.1 months (1.8-18.7 months), and 4 of 8 patients achieved at least stable disease. In two of these patients, atezolizumab treatment resulted in longer progression-free survival (PFS) compared with that of nivolumab. Conversely, one patient exhibited grade 4 diabetic ketoacidosis (DKA) within 2 weeks after the initial administration of atezolizumab. Another patient had developed type 1 diabetes mellitus (T1DM) during the prior nivolumab treatment and then developed DKA due to an infection after the initiation of atezolizumab. Both of them had high-risk human leukocyte antigen-DR/DQ types relevant to T1DM. These results demonstrate the potential efficacy of PD-L1 inhibitors to some tumors that have acquired resistance to PD-1 inhibitors and suggest that appropriate managements are required for not only a newly onset of T1DM but also blood glucose control after the development of T1DM during a reiteration of the PD-1/PD-L1 blockade.

DOI： 10.1507/endocrj.EJ20-0769

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41598-021-90086-w

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

<title>Abstract</title>For pituitary regenerative medicine, the creation of a hypophyseal model in monkeys is necessary to conduct future preclinical studies; however, previous studies reported that hypophysectomy in monkeys is not always safe or satisfactory. This study aimed to create a hypophyseal dysfunction model in a cynomolgus monkey using a safer surgical technique and establish the protocol of pituitary hormone replacement therapy for this model. Surgical resection of the pituitary gland of a 7.8-year-old healthy adult cynomolgus male monkey weighing 5.45 kg was performed to create a hypophyseal dysfunction model for future regenerative studies. Endoscopic transoral transsphenoidal surgery was used to perform hypophysectomy under navigation support. These procedures were useful for confirming total removal of the pituitary gland without additional bone removal and preventing complications such as cerebrospinal fluid leakage. Total removal was confirmed by pathological examination and computed tomography. Hypopituitarism was verified with endocrinological examinations including stimulation tests. Postoperatively, the monkey’s general condition of hypopituitarism was treated with hormone replacement therapy, resulting in long-term survival. The success of a minimally invasive and safe surgical method and long-term survival indicate the creation of a hypophyseal dysfunction model in a cynomolgus monkey; hence, this protocol can be employed in the future.

DOI： 10.1038/s41598-021-90209-3

Web of Science

PubMed

Other Link： http://www.nature.com/articles/s41598-021-90209-3

Language：English   Publishing type：Research paper (scientific journal)  

Immune-related adverse events induced by anti-programmed cell death-1 antibodies (PD-1-Ab), including destructive thyroiditis (thyroid-irAE), are thought to be caused by activated T cells. However, the T cell subsets that are directly responsible for damaging self-organs remain unclear. To clarify which T cell subsets are involved in the development of thyroid-irAE, a mouse model of thyroid-irAE was analyzed. PD-1-Ab administration 2.5 months after immunization with thyroglobulin caused destructive thyroiditis. Thyroiditis was completely prevented by previous depletion of CD4+ T cells and partially prevented by depleting CD8+ T cells. The frequencies of central and effector memory CD4+ T cell subsets and the secretion of interferon-γ after stimulation with thyroglobulin were increased in the cervical lymph nodes of mice with thyroid-irAE compared with controls. Histopathological analysis revealed infiltration of CD4+ T cells expressing granzyme B in thyroid glands and major histocompatibility complex class II expression on thyrocytes in mice with thyroid-irAE. Adoptive transfer of CD4+ T cells from cervical lymph nodes in mice with thyroid-irAE caused destruction of thyroid follicular architecture in the irradiated recipient mice. Flow cytometric analyses showed that the frequencies of central and effector memory CD4+ T cells expressing the cytotoxic marker CD27 were higher in peripheral blood mononuclear cells collected from patients with thyroid-irAE induced by PD-1-Ab versus those without. These data suggest a critical role for cytotoxic memory CD4+ T cells activated by PD-1-Ab in the pathogenesis of thyroid-irAE.

DOI： 10.1126/scitranslmed.abb7495

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

The reward system plays an important role in the pathogenesis of not only drug addiction, but also diet-induced obesity. Recent studies have shown that insulin and leptin receptor signaling in the ventral tegmental area (VTA) regulate energy homeostasis and that their dysregulation is responsible for obesity and altered food preferences. Although a high-fat diet (HFD) induces inflammation that leads to insulin and leptin resistance in the brain, it remains unclear whether HFD induces inflammation in the VTA. In the present study, we placed male mice on a chow diet or HFD for 3, 7, and 28 days and evaluated the mRNA expression of inflammatory cytokines and microglial activation markers in the VTA. The HFD group showed significantly elevated mRNA expressions of IL1β at 3 days; tumor necrosis factor-alpha (TNFα), IL1β, IL6, Iba1, and CD11b at 7 days; and TNFα, IL1β, Iba1, and CD11b at 28 days. The changes in TNFα were also confirmed in immunohistochemical analysis. Next, after administration of chow or HFD for 7 days, we selected mice with equal weights in both groups. In experiments using these mice, Akt phosphorylation in the VTA was significantly decreased after intracerebroventricular injection of insulin, whereas no change in STAT3 phosphorylation was found with leptin. Taken together, these results suggest that HFD induces inflammation at least partly associated with microglial activation in the VTA leading to insulin resistance, independently of the energy balance. Our data provide new insight into the pathophysiology of obesity caused by a dysfunctional reward system under HFD conditions.

DOI： 10.1016/j.neuroscience.2021.02.009

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：BMJ  

Background

Pituitary dysfunction is a life-threatening immune-related adverse event (irAE) induced by immune checkpoint inhibitors (ICIs). To date, it is not possible to identify patients who may develop pituitary irAEs prior to ICI treatment. The aim of this study was to characterize the predisposition for ICI-induced pituitary irAEs by analyzing anti-pituitary antibodies (APAs) and human leukocyte antigens (HLAs).

Methods

In this case–control study, APAs and HLA alleles were analyzed in 62 patients (17 who developed ICI-induced isolated adrenocorticotropic hormone deficiency (ICI-IAD), 5 who developed ICI-induced hypophysitis (ICI-H) and 40 who did not develop pituitary irAEs) treated with ICIs between November 2, 2015, and March 31, 2020, at Nagoya University Hospital. The main outcome measures in this study were the association between the development of pituitary irAEs with APAs at baseline and after treatment and HLA alleles.

Results

Eleven of 17 (64.7%) patients who developed ICI-IAD had APAs at baseline, whereas APAs were positive only in 1 of 40 (2.5%) control patients. Although APAs were negative at baseline in all patients who developed ICI-H, they had become positive before the onset of ICI-H in 3 of 4 patients several weeks after ipilimumab administration. At the onset of ICI-IAD and ICI-H, APAs were positive in 15 of 17 (88.2%) and 4 of 5 (80%) patients, respectively. The prevalence of HLA-Cw12, HLA-DR15, HLA-DQ7, and HLA-DPw9 was significantly higher in patients with ICI-IAD, whereas that of HLA-Cw12 and HLA-DR15 was significantly higher in patients with ICI-H than in controls.

Conclusions

This study showed distinct and overlapped patterns of APAs and HLA alleles between ICI-IAD and ICI-H. Our findings also showed that positive APAs at baseline and after treatment, together with susceptible HLA alleles, could become predictive biomarkers for ICI-IAD and ICI-H, respectively.

Trial registration number

UMIN000019024.

DOI： 10.1136/jitc-2021-002493

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Arginine vasopressin (AVP) synthesized in the magnocellular neurons of the hypothalamus is transported through their axons and released from the posterior pituitary into the systemic circulation to act as an antidiuretic hormone. AVP synthesis and release are precisely regulated by changes in plasma osmolality. Magnocellular AVP neurons receive innervation from osmosensory and sodium-sensing neurons, but previous studies showed that AVP neurons per se are osmosensitive as well. In the current study, we made AVP-Venus reporter mice and showed that Venus was expressed exclusively in AVP neurons and was upregulated under water deprivation. In hypothalamic organotypic cultures from the AVP-Venus mice, Venus-labeled AVP neurons in the supraoptic and paraventricular nuclei survived for 1 month, and Venus expression was upregulated by forskolin. Furthermore, in dissociated Venus-labeled magnocellular neurons, treatment with NaCl, but not with mannitol, decreased Venus fluorescence in the soma of the AVP neurons. Thus, Venus expression in AVP-Venus transgenic mice, as well as in primary cultures, faithfully showed the properties of intrinsic AVP expression. These findings indicate that AVP-Venus mice as well as the primary hypothalamic cultures could be useful for studying magnocellular AVP neurons.

DOI： 10.1016/j.peptides.2021.170517

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Endocrinology and Metabolism  

DOI： 10.3803/EnM.2021.1007

Web of Science

PubMed

Authorship：Last author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：(一社)日本内分泌学会  

Authorship：Last author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Authorship：Last author,　Corresponding author   Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

Excessive sodium salt (NaCl) or fat intake is associated with a variety of increased health risks. However, whether excessive NaCl intake accompanied by a high-fat diet (HFD) affects glucose metabolism has not been elucidated. In this study, C57BL/6J male mice were fed a normal chow diet (NCD), a NCD plus high-NaCl diet (NCD plus NaCl), a HFD, or a HFD plus high-NaCl diet (HFD plus NaCl) for 30 weeks. No significant differences in body weight gain, insulin sensitivity, and glucose tolerance were observed between NCD-fed and NCD plus NaCl-fed mice. In contrast, body and liver weights were decreased, but the weight of epididymal white adipose tissue was increased in HFD plus NaCl-fed compared to HFD-fed mice. HFD plus NaCl-fed mice had lower plasma glucose levels in an insulin tolerance test, and showed higher plasma glucose and lower plasma insulin levels in an intraperitoneal glucose tolerance test compared to HFD-fed mice. The β-cell area and number of islets were decreased in HFD plus NaCl-fed compared to HFD-fed mice. Increased Ki67-positive β-cells, and increased expression levels of Ki67, CyclinB1, and CyclinD1 mRNA in islets were observed in HFD-fed but not HFD plus NaCl-fed mice when compared to NCD-fed mice. Our data suggest that excessive NaCl intake accompanied by a HFD exacerbates glucose intolerance, with impairment in insulin secretion caused by the attenuation of expansion of β-cell mass in the pancreas.

DOI： 10.1371/journal.pone.0248065

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

The hypothalamus and pituitary have been identified to play essential roles in maintaining homeostasis. Various diseases can disrupt the functions of these systems, which can often result in serious lifelong symptoms. The current treatment for hypopituitarism involves hormone replacement therapy. However, exogenous drug administration cannot mimic the physiological changes that are a result of hormone requirements. Therefore, patients are at a high risk of severe hormone deficiency, including adrenal crisis. Pluripotent stem cells (PSCs) self-proliferate and differentiate into all types of cells. The generation of endocrine tissues from PSCs has been considered as another new treatment for hypopituitarism. Our colleagues established a 3-dimensional (3D) culture method for embryonic stem cells (ESCs). In this culture, the ESC-derived aggregates exhibit self-organization and spontaneous formation of highly ordered patterning. Recent results have shown that strict removal of exogenous patterning factors during early differentiation efficiently induces rostral hypothalamic progenitors from mouse ESCs. These hypothalamic progenitors generate vasopressinergic neurons, which release neuropeptides upon exogenous stimulation. Subsequently, we reported adenohypophysis tissue self-formation in 3D cultures of mouse ESCs. The ESCs were found to differentiate into both nonneural oral ectoderm and hypothalamic neuroectoderm in adjacent layers. Interactions between the 2 tissues appear to be critically important for in vitro induction of a Rathke's pouch-like developing embryo. Various endocrine cells were differentiated from nonneural ectoderm. The induced corticotrophs efficiently secreted adrenocorticotropic hormone when engrafted in vivo, which rescued hypopituitary hosts. For future regenerative medicine, generation of hypothalamic and pituitary tissues from human PSCs is necessary. We and other groups succeeded in establishing a differentiation method with the use of human PSCs. Researchers could use these methods for models of human diseases to elucidate disease pathology or screen potential therapeutics.

DOI： 10.1210/jendso/bvaa188

Web of Science

PubMed

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.neuroscience.2021.02.009.

Language：English   Publishing type：Research paper (scientific journal)  

This paper overviews the development and differentiation of the hypothalamus and pituitary gland from embryonic stem (ES) and induced pluripotent stem (iPS) cells. It is important to replicate the developmental process in vivo to create specific cells/organoids from ES/iPS cells. We also introduce the latest findings and discuss future issues for clinical application. Neuroectodermal progenitors are induced from pluripotent stem cells by strictly removing exogenous patterning factors during the early differentiation period. The induced progenitors differentiate into rostral hypothalamic neurons, in particular magnocellular vasopressin+ neurons. In three-dimensional cultures, the ES/iPS cells differentiate into hypothalamic neuroectoderm as well as non-neural head ectoderm back to back. Rathke's pouch-like structures self-organize at the interface between the two layers and generated various endocrine cells, including corticotrophs and somatotrophs from the Rathke's pouch-like structures. Our next objective is to sophisticate our stepwise methodology to establish the novel transplantation treatment for hypopituitarism and to apply it to developmental disease models.

DOI： 10.1111/dgd.12719

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本糖尿病学会  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ20-0216

PubMed

Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPANESE PHARMACOLOGICAL SOC  

We investigated whether peripheral combination treatment of a sodium-glucose cotransporter 2 (SGLT2) inhibitor and leptin improves glucose metabolism in insulin-dependent diabetes mellitus (IDDM) model mice. Twelve-week-old male C57BL6 mice were intraperitoneally administered a high dose of streptozotocin to produce IDDM. IDDM mice were then divided into five groups: SGLT2 inhibitor treatment alone, leptin treatment alone, leptin and SGLT2 inhibitor co-treatment, untreated IDDM mice, and healthy mice groups. The blood glucose (BG) level at the end of the dark cycle was measured, and a glucose tolerance test (GTT) was performed and compared between the five groups. Leptin was peripherally administered at 20 mu g/day using an osmotic pump, and an SGLT2 inhibitor, ipragliflozin, was orally administered at 3 mg/kg/day. Monotherapy with SGLT2 inhibitor or leptin significantly improved glucose metabolism in mice as evaluated by BG and GTT compared with the untreated group, whereas the co-treatment group with SGLT2 inhibitor and leptin further improved glucose metabolism as compared with the monotherapy group. Notably, glucose metabolism in the co-treatment group improved to the same level as that in the healthy mice group. Thus, peripheral combination treatment with leptin and SGLT2 inhibitor improved glucose metabolism in IDDM mice without the use of insulin. (C) 2021 The Authors. Production and hosting by Elsevier B.V. on behalf of Japanese Pharmacological Society.

DOI： 10.1016/j.jphs.2021.08.010

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)  

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)  

Web of Science

Authorship：Last author   Language：English  

DOI： 10.1210/jendso/bvaa188.

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ20-0436

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

<title>Abstract</title>The immunoglobulin heavy chain binding protein (BiP), also referred to as 78-kDa glucose-regulated protein (GRP78), is a pivotal endoplasmic reticulum (ER) chaperone which modulates the unfolded protein response under ER stress. Our previous studies showed that BiP is expressed in arginine vasopressin (AVP) neurons under non-stress conditions and that BiP expression is upregulated in proportion to the increased AVP expression under dehydration. To clarify the role of BiP in AVP neurons, we used a viral approach in combination with shRNA interference for BiP knockdown in mouse AVP neurons. Injection of a recombinant adeno-associated virus equipped with a mouse AVP promoter and BiP shRNA cassette provided specific BiP knockdown in AVP neurons of the supraoptic (SON) and paraventricular nuclei (PVN) in mice. AVP neuron-specific BiP knockdown led to ER stress and AVP neuronal loss in the SON and PVN, resulting in increased urine volume due to lack of AVP secretion. Immunoelectron microscopy of AVP neurons revealed that autophagy was activated through the process of AVP neuronal loss, whereas no obvious features characteristic of apoptosis were observed. Pharmacological inhibition of autophagy by chloroquine exacerbated the AVP neuronal loss due to BiP knockdown, indicating a protective role of autophagy in AVP neurons under ER stress. In summary, our results demonstrate that BiP is essential for the AVP neuron system.

DOI： 10.1038/s41598-020-76839-z

Web of Science

PubMed

Other Link： http://www.nature.com/articles/s41598-020-76839-z

Language：English   Publishing type：Research paper (scientific journal)  

Misfolded or unfolded proteins in the ER are said to be degraded only after translocation or isolation from the ER. Here, we describe a mechanism by which mutant proteins are degraded within the ER. Aggregates of mutant arginine vasopressin (AVP) precursor were confined to ER-associated compartments (ERACs) connected to the ER in AVP neurons of a mouse model of familial neurohypophysial diabetes insipidus. The ERACs were enclosed by membranes, an ER chaperone and marker protein of phagophores and autophagosomes were expressed around the aggregates, and lysosomes fused with the ERACs. Moreover, lysosome-related molecules were present within the ERACs, and aggregate degradation within the ERACs was dependent on autophagic-lysosomal activity. Thus, we demonstrate that protein aggregates can be degraded by autophagic-lysosomal machinery within specialized compartments of the ER.

DOI： 10.1016/j.isci.2020.101648

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.scr.2020.101960

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41387-020-00137-w

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(有)科学評論社  

Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: The aim of this study was to determine the effectiveness of the Smart Life Stay (SLS) program, which is an experience-oriented stayover program, in combination with health tourism and mandatory health guidance on glucose metabolism after 2 years. METHODS: The participants of the SLS program (n = 792) were recruited from a database of 23 medical insurers. They underwent a mandatory health examination termed Specific Health Checkups in 2014. The participants were included if they had diabetes or were at a high risk of diabetes and if they satisfied the following inclusion criteria: (1) body mass index (BMI; kg/m2) > 25, or (2) waist circumference (WC; cm) > 85 for men and > 90 for women, or (3) hemoglobin A1c (HbA1c; %) > 5.6, or (4) fasting plasma glucose (FPG; mg/dl) > 100. Individuals who corresponded to one or more items were included as study participants. The control subjects (n = 3645) were nonparticipants of the program who were selected from the database and met the inclusion criteria. The lifestyle changes and changes in mean BMI, WC, FPG, and HbA1c in both groups from baseline to 2-year follow-up were compared by inverse probability weighting of a propensity score. RESULTS: The percentage of people who exercised regularly increased significantly in the SLS group compared with the control group. In the SLS group, BW, BMI, and WC significantly decreased by 1.75 kg, 0.60 kg/m2, and 1.45 cm, respectively, whereas in the control group, WC, FPG, and HbA1c increased significantly by 0.38 cm, 3.37 mg/dl, and 0.12%, respectively. The comparison between groups revealed that the BW, BMI, WC, FPG, and HbA1c improved significantly in the SLS group. CONCLUSIONS: The SLS program is suggested to help improve glucose metabolism. This program could be a feasible option as a lifestyle intervention program for diabetes.

DOI： 10.1038/s41387-020-00136-x

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1182/blood.2019002654

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本糖尿病学会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

We generated three disease-specific iPSC lines from a Multiple endocrine neoplasia type 1 (MEN1) patient and three control iPSC lines from an unaffected blood relative of the patient using unutilized lymphoblastoid B cell lines (LCLs) as a cell resource. The expression of pluripotency markers, retaining of normal karyotype of chromosome, absence of episomal vectors used for generating the iPSCs and EBV used for generating LCLs, and the potential to differentiate into three germ layers, were confirmed for each iPSC line. These iPSC lines can be useful for construction of the disease models in vitro, and elucidation of the disease mechanisms.

DOI： 10.1016/j.scr.2020.101846

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

Glial cells can mediate hypothalamic inflammatory processes induced in response to a high-fat diet (HFD). We used magnetic-activated cell sorting (MACS) to isolate microglia and astrocytes from hypothalamus of mice fed HFD and examined changes in expression of inflammation-related cytokines and markers related to glial cell activation status. Hypothalamus from male C57BL6 mice fed a chow diet (chow) or HFD for 1, 3, or 28 days were collected and microglia and astrocytes were isolated by MACS. After confirming cell viability by fluorescence activated cell sorting, mRNA expression levels of inflammation-related cytokines and markers of glial cell activation status were examined by qRT-PCR, which revealed that both glial cell types isolated by MACS retained specificity. On day 3 of HFD, both CD86 and TNFα mRNA expression was significantly increased in microglia relative to the chow group. In astrocytes, TNFα mRNA expression levels were similar between the chow and HFD groups on day 3, but anti-inflammatory cytokine IL-10 levels were significantly increased. On day 7 of HFD, TNFα expression in microglia decreased to levels comparable to the chow group while that in astrocytes remained unchanged. On day 28 of HFD, TNFα levels were significantly increased in both microglia and astrocytes, which had increased mRNA expression of CD86 and MAO-B, respectively. For both glial cell types, results for TNFα expression assessed by RT-PCR and immunohistochemical analysis were similar. These results indicate that the role of microglia and astrocytes in hypothalamic inflammation under HFD conditions changed with time and these changes were accompanied by changes in the activation status of glial cells. Our data suggest that early after initiating HFD, hypothalamic astrocytes suppress diet-induced inflammation at least in part by secreting IL-10, whereas continued HFD feeding impairs this suppressive function such that both microglia and astrocytes promote hypothalamic inflammation.

DOI： 10.1016/j.neuint.2020.104733

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

BACKGROUND: Anti-programmed cell death-1 (PD-1) antibodies can cause thyroid dysfunction. However, no predictive biomarkers enabling stratification of thyroid dysfunction risk have been identified. METHODS: A total of 209 patients treated with an anti-PD-1 antibody were evaluated for anti-thyroid antibodies at baseline and prospectively for thyroid function every 6 weeks for 24 weeks after treatment initiation, and then observed until the visits stopped. Thyroid ultrasonography was performed if the patient was positive for anti-thyroid antibodies at baseline. RESULTS: Of the 209 patients, 19 (9.1%) developed thyroid dysfunction (destructive thyroiditis or hypothyroidism). The cumulative incidence of thyroid dysfunction was significantly higher in patients who were positive vs. negative for anti-thyroid antibodies (15/44 [34.1%] vs. 4/165 [2.4%], p < 0.001). Forty-two patients positive for anti-thyroid antibodies at baseline were divided into two groups according to the presence of an irregular echo pattern. The cumulative incidence of thyroid dysfunction was significantly higher in those with an irregular vs. a regular echo pattern (13/23 [56.5%] vs. 1/19 [5.3%], p = 0.001). None of the patients developed thyroid dysfunction after the initial 24-week period. CONCLUSIONS: The risk of thyroid dysfunction induced by anti-PD-1 antibodies can be predicted by evaluation of anti-thyroid antibodies and the thyroid echo pattern at baseline. TRIAL REGISTRATION: UMIN000019024.

DOI： 10.1038/s41416-020-0736-7

Web of Science

PubMed

Other Link： http://www.nature.com/articles/s41416-020-0736-7

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)  

Type 2 diabetes and dyslipidemia are diseases that collectively increase the risk of patients developing cardiovascular complications. Several incretin-based drugs are reported to improve lipid metabolism, and one of these medications, anagliptin, is a dipeptidyl peptidase-4 (DPP-4) inhibitor that has been shown to decrease serum triglyceride and low-density lipoproteins cholesterol. This study aimed to conduct an investigation into the effects of anagliptin on serum lipid profiles. This multicenter, open-label, randomized (1:1), parallel group study was designed to evaluate the effects of anagliptin on serum lipid profiles (triglycerides, lipoproteins, apolipoproteins, and cholesterol fractions). The study involved 24 patients with type 2 diabetes at two participating hospitals for a period of 24 weeks. Patients were randomly assigned to the anagliptin (n = 12) or control (n = 12) groups. Patients in the anagliptin group were treated with 200 mg of the drug twice daily. Patients in the control group did not receive anagliptin, but continued with their previous treatment schedules. Lipid metabolism was examined under fasting conditions at baseline and 24 weeks. Patients treated with anagliptin for 24 weeks exhibited significantly reduced levels of serum apolipoprotein B-48, a marker for lipid transport from the intestine, compared with the control group patients (P < 0.05). After 24 weeks of treatment, serum adiponectin levels were significantly raised, whereas glycated hemoglobin (HbA1c) levels were significantly lower compared with the baseline in the anagliptin group (P < 0.05), but not in the control group. This study showed that the DPP-4 inhibitor anagliptin reduces fasting apolipoprotein B-48 levels, suggesting that this drug may have beneficial effects on lipid metabolism possibly mediated by the inhibition of intestinal lipid transport.

DOI： 10.1371/journal.pone.0228004

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Nonalcoholic steatohepatitis (NASH) is a hepatic phenotype of the metabolic syndrome, and increases the risk of cirrhosis and hepatocellular carcinoma (HCC). Although increasing evidence points to the therapeutic implications of certain types of anti-diabetic agents in NASH, it remains to be elucidated whether their effects on NASH are independent of their effects on diabetes. Genetically obese melanocortin 4 receptor-deficient (MC4R-KO) mice fed Western diet are a murine model that sequentially develops hepatic steatosis, NASH, and HCC in the presence of obesity and insulin resistance. In this study, we investigated the effect of the dipeptidyl peptidase-4 (DPP-4) inhibitor anagliptin on NASH and HCC development in MC4R-KO mice. Anagliptin treatment effectively prevented inflammation, fibrosis, and carcinogenesis in the liver of MC4R-KO mice. Interestingly, anagliptin only marginally affected body weight, systemic glucose and lipid metabolism, and hepatic steatosis. Histological data and gene expression analysis suggest that anagliptin treatment targets macrophage activation in the liver during the progression from simple steatosis to NASH. As a molecular mechanism underlying anagliptin action, we showed that glucagon-like peptide-1 suppressed proinflammatory and profibrotic phenotypes of macrophages in vitro. This study highlights the glucose metabolism-independent effects of anagliptin on NASH and HCC development.

DOI： 10.1038/s41598-020-57935-6

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

The pituitary is a major hormone center that secretes systemic hormones responding to hypothalamus-derived-releasing hormones. Previously, we reported the independent pituitary induction and hypothalamic differentiation of human embryonic stem cells (ESCs). Here, a functional hypothalamic-pituitary unit is generated using human induced pluripotent stem (iPS) cells in vitro. The adrenocorticotropic hormone (ACTH) secretion capacity of the induced pituitary reached a comparable level to that of adult mouse pituitary because of the simultaneous maturation with hypothalamic neurons within the same aggregates. Corticotropin-releasing hormone (CRH) from the hypothalamic area regulates ACTH cells similarly to our hypothalamic-pituitary axis. Our induced hypothalamic-pituitary units respond to environmental hypoglycemic condition in vitro, which mimics a life-threatening situation in vivo, through the CRH-ACTH pathway, and succeed in increasing ACTH secretion. Thus, we generated powerful hybrid organoids by recapitulating hypothalamic-pituitary development, showing autonomous maturation on the basis of interactions between developing tissues.

DOI： 10.1016/j.celrep.2019.12.009

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1136/bmjdrc-2019-001115

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Endocrine Society  

DOI： 10.1507/endocrj.EJ19-0224

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Hypophysitis, which is often accompanied by pituitary dysfunction, is classified into several subtypes based on the cause, histology, and the location of inflammation in the pituitary gland. A definitive diagnosis requires pituitary biopsy, which is invasive, and the process is limited to specialized clinical settings. In this opinion paper, we review the literature associated with hypophysitis, and provide the guidelines of the Japan Endocrine Society for the diagnosis and treatment of autoimmune and IgG4-related hypophysitis.

DOI： 10.1507/endocrj.EJ19-0569

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: Several immune-related adverse events (irAEs) are reported to be associated with therapeutic efficacy of immune checkpoint inhibitors, yet whether pituitary dysfunction, a life-threatening irAE, affects overall survival (OS) in patients with malignancies is unclear. This prospective study examined the association of pituitary dysfunction (pituitary-irAE) with OS of patients with non-small cell lung carcinoma (NSCLC) or malignant melanoma (MM). METHODS: A total of 174 patients (NSCLC, 108; MM, 66) treated with ipilimumab, nivolumab, pembrolizumab, or atezolizumab at Nagoya University Hospital were evaluated for OS and the development of pituitary-irAE. Kaplan-Meier curves of OS as a function of the development of pituitary-irAE were produced with the log-rank test as a primary endpoint. RESULTS: Pituitary-irAE was observed in 16 patients (4 (3.7%) with NSCLC, 12 (18.2%) with MM) having two different disease types: hypophysitis with deficiency of multiple anterior pituitary hormones accompanied by pituitary enlargement, and isolated adrenocorticotropic hormone (ACTH) deficiency without pituitary enlargement. Among these patients, 6 developed pituitary-irAE while being treated with ipilimumab (6/25 patients (24.0%) treated with ipilimumab) and 10 developed pituitary-irAE during treatment with nivolumab or pembrolizumab (10/167 (6.0%)). All 16 patients had ACTH deficiency and were treated with physiological doses of hydrocortisone. The development of pituitary-irAE was associated with better OS in patients with NSCLC (not reached vs 441 (95% CI not calculated) days, p<0.05) and MM (885 (95% CI 434 to 1336) vs 298 (95% CI 84 to 512) days, p<0.05). CONCLUSIONS: In our study cohort, the incidence of pituitary-irAE was higher than previously reported and the development of pituitary-irAE predicted better prognosis for both NSCLC and MM when patients were treated with physiological doses of hydrocortisone. CLINICAL TRIALS REGISTRATION: UMIN000019024.

DOI： 10.1136/jitc-2020-000779

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)  

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

Binge eating could contribute to the development of obesity, and previous studies suggest that gamma-aminobutyric acid (GABA) type B receptor (GABABR) signaling is involved in the regulation of binge eating. Here, we show that time-restricted access to a high-fat diet (HFD) induces binge-like eating behavior in wild-type mice. HFD consumption during restricted time was significantly increased in corticostriatal neuron-specific GABABR-deficient mice compared with wild-type mice. Furthermore, the GABABR agonist baclofen suppressed HFD intake during restricted time in wild-type mice but not in corticostriatal or dopaminergic neuron-specific GABABR-deficient mice. In contrast, there were no significant differences in food consumption among genotypes under ad libitum access to HFD. Thus, our data show that the mesolimbic system regulates food consumption under time-restricted but not ad libitum access to HFD and have identified a mechanism by which GABABR signaling suppresses binge-like eating of HFD.

DOI： 10.1016/j.isci.2019.09.032

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本肥満学会  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.scr.2019.101572

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

TAR DNA-binding protein 43 kDa (TDP-43), encoded by TARDBP, is an RNA-binding protein, the nuclear depletion of which is the histopathological hallmark of amyotrophic lateral sclerosis (ALS), a fatal neurodegenerative disorder affecting both upper and lower motor neurons. Besides motor symptoms, patients with ALS often develop nonneuronal signs including glucose intolerance, but the underlying pathomechanism is still controversial, i.e., whether it is impaired insulin secretion and/or insulin resistance. Here, we showed that ALS subjects reduced early-phase insulin secretion and that the nuclear localization of TDP-43 was lost in the islets of autopsied ALS pancreas. Loss of TDP-43 inhibited exocytosis by downregulating CaV1.2 calcium channels, thereby reducing early-phase insulin secretion in a cultured β cell line (MIN6) and β cell-specific Tardbp knockout mice. Overexpression of CaV1.2 restored early-phase insulin secretion in Tardbp knocked-down MIN6 cells. Our findings suggest that TDP-43 regulates cellular exocytosis mediated by L-type voltage-dependent calcium channels and thus plays an important role in the early phase of insulin secretion by pancreatic islets. Thus, nuclear loss of TDP-43 is implicated in not only the selective loss of motor neurons but also in glucose intolerance due to impaired insulin secretion at an early stage of ALS.

DOI： 10.1172/JCI124481

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1177/1932296819851785

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Tanycytes have recently been accepted as neural stem/progenitor cells in the postnatal hypothalamus. Persistent retina and anterior neural fold homeobox (Rax) expression is characteristic of tanycytes in contrast to its transient expression of whole hypothalamic precursors. In this study, we found that Rax+ residual cells in the maturation phase of hypothalamic differentiation in mouse embryonic stem cell (mESC) cultures had similar characteristics to ventral tanycytes. They expressed typical neural stem/progenitor cell markers, including Sox2, vimentin, and nestin, and differentiated into mature neurons and glial cells. Quantitative RT-PCR analysis showed that Rax+ residual cells expressed Fgf-10, Fgf-18, and Lhx2, which are expressed by ventral tanycytes. They highly expressed tanycyte-specific genes Dio2 and Gpr50 compared with Rax+ early hypothalamic progenitor cells. Therefore, Rax+ residual cells in the maturation phase of hypothalamic differentiation were considered to be more differentiated and similar to late progenitor cells and tanycytes. They self-renewed and formed neurospheres when cultured with exogenous FGF-2. Additionally, these Rax+ neurospheres differentiated into three neuronal lineages (neurons, astrocytes, and oligodendrocytes), including neuropeptide Y+ neuron, that are reported to be differentiated from ventral tanycytes toward the arcuate nuclei. Thus, Rax+ residual cells were multipotent neural stem/progenitor cells. Rax+ neurospheres were stably passaged and retained high Sox2 expression even after multiple passages. These results suggest the successful induction of Rax+ tanycyte-like cells from mESCs [induced tanycyte-like (iTan) cells]. These hypothalamic neural stem/progenitor cells may have potential in regenerative medicine and as a research tool.

DOI： 10.1210/en.2019-00105

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.foodres.2019.03.034

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内科学会  

Language：English   Publishing type：Research paper (scientific journal)  

Primary sclerosing cholangitis (PSC) has been known as a cause of secondary osteoporosis, which often requires medication. Herein, we give the first report of a case of a 38-year-old man with fatigue and paralysis in both upper limbs who had been treated with denosumab for secondary osteoporosis associated with PSC. Since bisphosphonate (alendronate) was ineffective in our patient, the treatment was changed from alendronate to denosumab. Despite replacements with calcium and active vitamin D (alfacalcidol; 1-hydroxycholecalciferol), he developed severe hypocalcemia (albumin-adjusted serum calcium: 5.2 mg/dL) 2 weeks after the second administration of denosumab, which required immediate correction. After that, the corrected serum calcium levels were controlled within the normal range with 0.75 μg of eldecalcitol (1α,25-dihydroxy-2β-(3-hydroxypropyloxy)vitamin D3) and increased doses of calcium (1,500 mg daily) and phosphate (900 mg daily) without denosumab. Even though denosumab treatment had been terminated, the T score of the lumbar spine improved from -4.4 to -2.6 by 1 year after the second administration, possibly due to the amelioration of osteomalacia through the treatment with eldecalcitol and the higher doses of calcium and phosphate. This report indicates that denosumab can cause severe hypocalcemia in patients with osteoporosis associated with chronic diseases of the hepatobiliary system including PSC, in turn suggesting that the possibility of vitamin D deficiency or osteomalacia should be considered before administering treatments and that serum calcium levels should be closely monitored to detect life-threatening hypocalcemia in patients who have high risk factors for hypocalcemia.

DOI： 10.1507/endocrj.EJ18-0545

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Immune checkpoint inhibitors (ICIs) have become a promising treatment for advanced malignancies. However, these drugs can induce immune-related adverse events (irAEs) in several organs, including skin, gastrointestinal tract, liver, muscle, nerve, and endocrine organs. Endocrine irAEs comprise hypopituitarism, primary adrenal insufficiency, thyroid dysfunction, hypoparathyroidism, and type 1 diabetes mellitus. These conditions have the potential to lead to life-threatening consequences, such as adrenal crisis, thyroid storm, severe hypocalcemia, and diabetic ketoacidosis. It is therefore important that both endocrinologists and oncologists understand the clinical features of each endocrine irAE to manage them appropriately. This opinion paper provides the guidelines of the Japan Endocrine Society and in part the Japan Diabetes Society for the management of endocrine irAEs induced by ICIs.

DOI： 10.1507/endocrj.EJ19-0163

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

BACKGROUND: In pediatric patients with steroid-sensitive nephrotic syndrome, recent trials have revealed that a 2-month, short-term steroid regimen is not inferior to an extended steroid course. However, the optimal duration of initial steroid therapy for adult steroid-sensitive minimal change disease (MCD) remains unclear. OBJECTIVES: The aim of present study was to evaluate the effectiveness of a 2-month, short-term steroid regimen in the treatment of adult steroid-sensitive MCD patients. METHOD: This was a prospective observational study. Adult patients with steroid-sensitive MCD (n = 35) who were initiated on a short-term steroid regimen between January 2015 and June 2016 were included. The details of the regimen are as follows: (1) prednisolone was administered at an initial dose of 0.8-1.0 mg/kg/day and continued for 4-6 weeks and (2) dosage was reduced to 0.5-0.6 mg/kg/alternate day and continued for 4 weeks. Control patients (n = 140), who were treated using conventional steroid administration, were selected from our previous adult MCD cohort. All patients fulfilled the following criteria: biopsy-proven MCD, age ≥20 years, first episode of nephrotic syndrome, and attainment of complete remission within 4 weeks. The following parameters of patients who received short-term treatment regimen and control patients were compared: any relapse and frequent relapse, adverse events caused by steroid treatment and cumulative steroid dose. RESULTS: Throughout the observation period (median: 17.3 months), 24 (68.6%) patients in the short-term group developed at least one relapse. The short-term regimen showed earlier occurrence of any relapse than the conventional regimen (adjusted hazard ratio [aHR] 2.45; 95% CI 1.51-3.97; p < 0.001), but there was no difference in frequent relapse (aHR 1.31; 95% CI 0.43-3.99; p = 0.63). None of the patients showed any symptoms of adrenal insufficiency after discontinuation of corticosteroids. The cumulative steroid dose during the observational period was significantly lower in the short-term group than in the conventional group. CONCLUSIONS: The short-term steroid regimen may represent an effective treatment option that ensures lower steroid exposure when treating adult steroid-sensitive MCD patients.

DOI： 10.1159/000495352

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/cas.13800

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本肥満学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

当院で傍鞍部腫瘍に対しeTSS(内視鏡下経鼻経蝶形骨手術)を施行した98例(男性50例、女性48例、平均年齢55.9歳)を対象に、術後の遅発性低Na血症(DHN)発症について検討した。その結果、DHNは37例(37.8%)に認められた。DHN発症患者ではDHN発症時のAVP分泌が抑制されていないことが確認された。また、術後7日目においてDHN非発症患者では約3%程度の体重低下を認めるのに対し、DHN発症例では体重減少は1%程度と軽微であり、体内への水分貯留が示唆された。術前より尿崩症が認められた患者群ではDHN発症が少なかったものの、DHN発症例では渇感中枢障害を伴っていた。これは術後の脱水を危惧したADH補充による医原性のものと考えられた。以上、傍鞍部腫瘍の術後DHNの発症にはSIADHが強く関与していることが考えられた。尚、術後早期からの水分制限はDHN発症予防に有効と考えられたが、より適切なプロトコールならびに予測法の確立が必要である。

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ireland Ltd  

Familial neurohypophysial diabetes insipidus (FNDI), characterized by progressive polyuria and loss of arginine vasopressin (AVP) neurons, is an autosomal dominant disorder caused by AVP gene mutations. Our previous studies with FNDI model mice demonstrated that mutant proteins accumulated in the endoplasmic reticulum (ER) of AVP neurons. Here, we examined therapeutic effects of the chemical chaperone 4-phenylbutylate (4-PBA) in FNDI mice. Treatment with 4-PBA reduced mutant protein accumulation in the ER of FNDI mice and increased AVP release, leading to reduced urine volumes. Furthermore, AVP neuron loss under salt loading was attenuated by 4-PBA treatment. These data suggest that 4-PBA ameliorated mutant protein accumulation in the ER of AVP neurons and thereby prevented FNDI phenotype progression.

DOI： 10.1016/j.neulet.2018.06.013

Web of Science

Scopus

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/jdi.12907

PubMed

Language：English  

DOI： 10.1007/s00441-018-2872-4

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/jdi.12877

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1200/JCO.2018.36.15_suppl.9091

Web of Science

Language：English   Publishing type：Research paper (scientific journal)  

The anterior pituitary gland produces several hormones essential for regulation of the somatic endocrine system. Deficiency of these hormones can cause life-threatening diseases, including adrenal crisis. Pituitary tissue generated from human pluripotent stem cells is expected to provide better treatment than current hormone replacement therapy. During early mammalian development, the pituitary anlage (Rathke's pouch) develops from non-neural ectoderm adjacent to the developing ventral hypothalamus. The close interaction between these two tissues is crucial for Rathke's pouch development and involves several signaling molecules. Early exposure of human embryonic stem cells in 3D floating culture to sonic hedgehog and bone morphogenetic protein 4 promoted the cells' differentiation into oral ectoderm and, subsequently, hormone-producing cells such as corticotrophs (adrenocorticotropic hormone-producing cells). The differentiation approach described herein, which induces the formation of pituitary tissue in contact with hypothalamic neural tissue, mimics mammalian pituitary development. The differentiated corticotrophs are functional, responding normally to both release and feedback signals. © 2018 by John Wiley & Sons, Inc.

DOI： 10.1002/cpns.48

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)  

Context: Immune checkpoint inhibitors, including anti-programmed cell death-1 (PD-1) antibodies, have become promising treatments for a variety of advanced malignancies. However, these medicines can cause immune-related adverse events (irAEs), including endocrinopathies. Objective: This study examined the incidence of endocrine irAEs induced by nivolumab. Patients and Main Outcome Measured: Sixty-six patients treated with nivolumab at Nagoya University Hospital were prospectively evaluated for pituitary hormones, thyroid function, antithyroid antibodies (Abs), and glucose levels every 6 weeks after the initiation of nivolumab for 24 weeks. Results: Four out of 66 patients developed destructive thyroiditis, and three patients developed hypothyroidism requiring levothyroxine replacement. The prevalence of positive anti-thyroglobulin Abs (TgAbs) and/or anti-thyroid peroxidase Abs (TPOAbs) at baseline was significantly higher in the group that developed destructive thyroiditis (3/4) compared with the group that did not develop thyroiditis (3/62; P = 0.002). There were no significant differences in other clinical variables between the groups. There were no endocrine irAEs other than destructive thyroiditis during the 24 weeks. The prevalence of TgAbs and/or TPOAbs at baseline was not associated with the development of other irAEs, including pneumonitis, colitis, or skin reactions. Conclusions: Our real-world data showed that destructive thyroiditis was an endocrine irAE that was frequently induced by nivolumab and was significantly associated with positive TgAbs and/or TPOAbs before treatment. Our findings indicate that evaluating these Abs before treatment may help identify patients with a high risk of thyroidal irAEs and may have important clinical benefit.

DOI： 10.1210/js.2017-00432

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41598-018-22053-x

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1152/ajpendo.00352.2017

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/path.5046

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1507/endocrj.EJ17-0399

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE INC  

Excess carbohydrate intake causes obesity in humans. On the other hand, acute administration of fructose, glucose or sucrose in experimental animals has been shown to increase the plasma concentration of anti-obesity hormones such as glucagon-like peptide 1 (GLP-1) and Fibroblast growth factor 21 (FGF21), which contribute to reducing body weight. However, the secretion and action of GLP-1 and FGF21 in mice chronically fed a high-sucrose diet has not been investigated. To address the role of anti-obesity hormones in response to increased sucrose intake, we analyzed mice fed a high-sucrose diet, a high-starch diet or a normal diet for 15 weeks. Mice fed a high-sucrose diet showed resistance to body weight gain, in comparison with mice fed a high-starch diet or control diet, due to increased energy expenditure. Plasma FGF21 levels were highest among the three groups in mice fed a high-sucrose diet, whereas no significant difference in GLP-1 levels was observed. Expression levels of uncoupling protein 1 (UCP-1), FGF receptor 1c (FGFR1c) and beta-klotho (KLB) mRNA in brown adipose tissue were significantly increased in high sucrose-fed mice, suggesting increases in FGF21 sensitivity and energy expenditure. Expression of carbohydrate responsive element binding protein (ChREBP) mRNA in liver and brown adipose tissue was also increased in high sucrose-fed mice. These results indicate that FGF21 production in liver and brown adipose tissue is increased in high-sucrose diet and participates in resistance to weight gain. (C) 2017 The Authors. Published by Elsevier Inc.

DOI： 10.1016/j.jnutbio.2017.07.010

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本肥満学会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：NAGOYA UNIV, SCH MED  

The Internet of Things (IoT) allows collecting vast amounts of health-relevant data such as daily activity, body weight (BW), and blood pressure (BP) automatically. The use of IoT devices to monitor diabetic patients has been studied, but could not evaluate IoT-dependent effects because health data were not measured in control groups. This multicenter, open-label, randomized, parallel group study will compare the impact of intensive health guidance using IoT and conventional medical guidance on glucose control. It will be conducted in outpatients with type 2 diabetes for a period of 6 months. IoT devices to measure amount of daily activity, BW, and BP will be provided to IoT group patients. Healthcare professionals (HCPs) will provide appropriate feedback according to the data. Non-IoT control, patients will be given measurement devices that do not have a feedback function. The primary outcome is glycated hemoglobin at 6 months. The study has already enrolled 101 patients, 50 in the IoT group and 51 in the non-IoT group, at the two participating outpatient clinics. The baseline characteristics of two groups did not differ, except for triglycerides. This will be the first randomized, controlled study to evaluate IoT-dependent effects of intensive feedback from HCPs. The results will validate a new method of health-data collection and provision of feedback suitable for diabetes support with increased effectiveness and low cost.

DOI： 10.18999/nagjms.79.3.323

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER IRELAND LTD  

Sequestosome 1 (SQSTM1) also known as ubiquitin-binding protein p62 (p62) is a cargo protein involved in the degradation of misfolded proteins via selective autophagy. Disruption of autophagy and resulting accumulation of misfolded proteins in the endoplasmic reticulum (ER) leads to ER stress. ER stress is implicated in several neurodegenerative diseases and obesity. As knockout of p62 (p62KO) reportedly induces obesity in mice, we examined how p62 contributes to ER stress and the ensuing unfolded protein response (UPR) in hypothalamus using mouse organotypic cultures in the present study. Cultures from p62KO mice showed significantly reduced formation of LC3-GFP puncta, an index of autophagosome formation, in response to the chemical ER stressor thapsigargin compared to wild-type (WT) cultures. Hypothalamic cultures from p62KO mice exhibited higher basal expression of the UPR/ER stress markers CHOP mRNA and ATF4 mRNA than WT cultures. Thapsigargin enhanced CHOP, ATF4, and BiP mRNA as well as p-elF2 alpha protein expression in both NWT and p62KO cultures, but all peak values were greater in p621(0 cultures. A proteasome inhibitor increased p62 expression in WT cultures and upregulated the UPR/ER stress markers CHOP mRNA and ATF4 mRNA in both genotypes, but to a greater extent in p62KO cultures. Therefore, p62 deficiency disturbed autophagosome formation and enhanced both basal and chemically induced ER stress, suggesting that p62 serves to prevent ER stress in mouse hypothalamus by maintaining protein folding capacity. (C) 2017 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.neulet.2017.06.014

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE  

Hypothalamic insulin receptor signaling regulates energy balance and glucose homeostasis via agouti related protein (AgRP). While protein tyrosine phosphatase 1B (PTP1B) is classically known to be a negative regulator of peripheral insulin signaling by dephosphorylating both insulin receptor beta (IR beta) and insulin receptor substrate, the role of PTP1B in hypothalamic insulin signaling remains to be fully elucidated. In the present study, we investigated the role of PTP1B in hypothalamic insulin signaling using PTP1B deficient (KO) mice in vivo and ex vivo. For the in vivo study, hypothalamic insulin resistance induced by a high-fat diet (HFD) improved in KO mice compared to wild-type (WT) mice. Hypothalamic AgRP mRNA expression levels were also significantly decreased in KO mice independent of body weight changes. In an ex vivo study using hypothalamic organotypic cultures, insulin treatment significantly increased the phosphorylation of both IR beta and Akt in the hypothalamus of KO mice compared to WT mice, and also significantly decreased AgRP mRNA expression levels in KO mice. While incubation with inhibitors of phosphatidylinositol-3 kinase (PI3K) had no effect on basal levels of Akt phosphorylation, these suppressed insulin induction of Akt phosphorylation to almost basal levels in WT and KO mice. The inhibition of the PI3K-Akt pathway blocked the downregulation of AgRP mRNA expression in KO mice treated with insulin. These data suggest that PTP1B acts on the hypothalamic insulin signaling via the PI3K-Akt pathway. Together, our results suggest a deficiency of PTP1B improves hypothalamic insulin sensitivity resulting in the attenuation of AgRP mRNA expression under HFD conditions. (C) 2017 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.bbrc.2017.05.019

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSIOLOGICAL SOC  

S100 calcium-binding protein B (S100B), a multifunctional macromolecule mainly expressed in nerve tissues and adipocytes, has been suggested to contribute to the pathogenesis of obesity. To clarify the role of S100B in insulin action and glucose metabolism in peripheral tissues, we investigated the effect of S100B on glycolysis in myoblast and myotube cells. Rat myoblast L6 cells were treated with recombinant mouse S100B to examine glucose consumption, lactate production, glycogen accumulation, glycolytic metabolites and enzyme activity, insulin signaling, and poly(ADP-ribosyl)ation of glyceraldehyde-3-phosphate dehydrogenase (GAPDH). Glycolytic metabolites were investigated by enzyme assays or metabolome analysis, and insulin signaling was assessed by Western blot analysis. Enzyme activity and poly(ADP-ribosyl) ation of GAPDH was evaluated by an enzyme assay and immunoprecipitation followed by dot blot with an anti-poly(ADP-ribose) antibody, respectively. S100B significantly decreased glucose consumption, glucose analog uptake, and lactate production in L6 cells, in either the presence or absence of insulin. In contrast, S100B had no effect on glycogen accumulation and insulin signaling. Metabolome analysis revealed that S100B increased the concentration of glycolytic intermediates upstream of GAPDH. S100B impaired GAPDH activity and increased poly(ADP-ribosyl) ated GAPDH proteins. The effects of S100B on glucose metabolism were mostly canceled by a poly(ADP-ribose) polymerase inhibitor. Similar results were obtained in C2C12 myotube cells. We conclude that S100B as a humoral factor may impair glycolysis in muscle cells independent of insulin action, and the effect may be attributed to the inhibition of GAPDH activity from enhanced poly(ADP-ribosyl) ation of the enzyme.

DOI： 10.1152/ajpendo.00328.2016

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

Purpose IgG4-related disease is a systemic inflammatory disease characterized by infiltration of IgG4-positive plasma cells into multiple organs, including the pituitary gland. Autoimmunity is thought to be involved in the pathogenesis of IgG4-related disease. The diagnosis of IgG4-related hypophysitis (IgG4-RH) is difficult because its clinical features, such as pituitary swelling and hypopituitarism, are similar to those of other pituitary diseases, including lymphocytic hypophysitis and sellar/suprasellar tumors. The presence and significance of anti-pituitary antibodies (APA) in IgG4-RH is unclear.
Methods In this case-control study, we used single indirect immunofluorescence on human pituitary substrates to assess the prevalence of serum APA in 17 patients with IgG4-RH, 8 control patients with other pituitary diseases (lymphocytic infundibulo-neurohypophysitis, 3; craniopharyngioma, 2; germinoma, 3), and 9 healthy subjects.We further analyzed the endocrine cells targeted by the antibodies using double indirect immunofluorescence.
Results APA were found in 5 of 17 patients with IgG4-RH (29%), and in none of the pituitary controls or healthy subjects. The endocrine cells targeted by the antibodies in the 5 IgG4-RH cases were exclusively corticotrophs. Antibodies were of the IgG1 subclass, rather than IgG4, in all 5 cases, suggesting that IgG4 is not directly involved in the pathogenesis. Finally, antibodies recognized pro-opiomelanocortin in 2 of the cases.
Conclusions Our study suggests that autoimmunity is involved in the pathogenesis of IgG4-RH and that corticotrophs are the main antigenic target, highlighting a possible new diagnostic marker for this condition.

DOI： 10.1007/s11102-016-0780-8

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

2016年6月時点において、当院で免疫チェックポイント阻害薬として抗CTLA-4抗体イピリムマブ(Ipi)が投与された12例および抗PD-1抗体ニボルマブ(Niv)が投与された23例を対象に、内分泌学的評価を行った。その結果、Ipi投与中の内分泌有害事象は下垂体炎が2件(16.7%)、低Na血症が2件(16.7%)、副腎炎が1件(8.3%)、TSH値異常が4件(33.3%)に認められた。Niv投与中の内分泌有害事象はTSH値異常が7件(35.0%)、破壊性甲状腺炎が1件(4.3%)、甲状腺自己抗体陽転化が1件(4.3%)に認められた。Ipi投与中に発生した下垂体炎は、2件とも前治療としてNivが投与されており、Niv治療歴のある場合にはIpiによる下垂体炎を特に注意する必要があると考えられた。また、当院で経験した重篤な破壊性甲状腺炎の経過から、Niv投与前に甲状腺自己抗体が陽性の場合には甲状腺障害の発症に注意が必要であると示唆された。

Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2017&ichushi_jid=J01160&link_issn=&doc_id=20170718400022&doc_link_id=10.1507%2Fendocrine.93.S.Update_70&url=https%3A%2F%2Fdoi.org%2F10.1507%2Fendocrine.93.S.Update_70&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Protein tyrosine phosphatase 1B (PTP1B) regulates leptin signaling in hypothalamic neurons via the JAK2-STAT3 pathway. PTP1B has also been implicated in the regulation of inflammation in the periphery. However, the role of PTP1B in hypothalamic inflammation, which is induced by a high-fat diet (HFD), remains to be elucidated. Here, we showed that STAT3 phosphorylation (p-STAT3) was increased in microglia in the hypothalamic arcuate nucleus of PTP1B knock-out mice (KO) on a HFD, accompanied by decreased Tnf and increased Il10 mRNA expression in the hypothalamus compared to wild-type mice (WT). In hypothalamic organotypic cultures, incubation with TNF alpha led to increased p-STAT3, accompanied by decreased Tnf and increased Il10 mRNA expression, in KO compared to WT. Incubation with p-STAT3 inhibitors or microglial depletion eliminated the differences in inflammation between genotypes. These data indicate an important role of JAK2-STAT3 signaling negatively regulated by PTP1B in microglia, which attenuates hypothalamic inflammation under HFD conditions. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

DOI： 10.1016/j.ebiom.2017.01.007

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Clozapine, a second-generation antipsychotic (SGA), is a cause of side effects related to metabolic syndrome. The participation of serotonin 5-HT2C and histamine H1 receptors in the central nervous system has been reported as a mechanism of the weight gain caused by clozapine. In the present study, we investigated the direct pharmacological action of clozapine on the 3T3-L1 adipocytes and compared it to that of blonanserin, an SGA with low affinity for both receptors. Short-term exposure to clozapine decreased secretion and mRNA expression of leptin. Long-term exposure decreased leptin as well as adiponectin secretion, and further increased lipid droplets accumulation. However, short- and long-term exposures to blonanserin did not affect these parameters. A selective serotonin 5-HT2C, but not a histamine H1, receptor antagonist enhanced the decreased secretion of leptin induced by short-term exposure to clozapine, but did not affect the increased accumulation of lipid droplets. Our findings indicate that clozapine, but not blonanserin, strongly and directly affected the secretion of adipokines, such as leptin, in adipocytes and caused adipocyte enlargement.

DOI： 10.1016/j.jphs.2017.01.004

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE  

Selective apoptosis of granule cells in the hippocampal dentate gyrus (DG) of rats with bilateral adrenalectomy (ADX) and in patients who died of adrenal insufficiency has been reported. Although adrenal insufficiency is a common disease and is usually associated with hyponatremia, its effect on the central nervous system and in apoptosis in the hippocampus remain to be elucidated. Using rat models to represent clinical hyponatremia accompanying adrenal insufficiency, we show that reduced serum [Na+] was associated with selective apoptosis in the DG. Nine days after ADX, apoptotic cells were observed in the DG of rats whose serum [Na+] was &lt;125 mEq/L (moderate hyponatremia), but rarely in those whose serum [Na+] was 125 mEq/L or in normonatremic rats. Although all hyponatremic ADX rats survived following treatment with corticosterone and saline started 7 days after ADX when apoptosis had not yet occurred, selective apoptosis on day 9 was not prevented in moderately hyponatremic rats. Interestingly, treatment with memantine, a noncompetitive NMDAR antagonist, prevented the selective apoptosis in the DG in moderately hyponatremic, ADX rats, and improved electrophysiological dysfunction, including impaired basal synaptic transmission and long-term potentiation at the entorhinal cortex-DG synapses. These results demonstrated that in adrenal insufficient rats, hyponatremia was associated with apoptosis in the DG, and that memantine prevented the apoptosis and improved cell function. Our data imply the importance of assessing the possibility of neurological impairments after treatment with CORT in patients with moderate or severe hyponatremia accompanying adrenal insufficiency and that memantine may represent a beneficial therapeutic strategy to prevent neurological impairments in such patients. (C) 2016 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.expneurol.2016.08.007

Web of Science

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Clinical Immunology  

Immune checkpoint inhibitors, used for cancer immunotherapy, show anti-tumor effects through T cell activations. Monoclonal antibodies against cytotoxic T lymphocyte antigen-4 (CTLA-4), programmed cell death (PD)-1, or PD-ligand 1 which is a ligand of PD-1 have been shown to be effective in the treatments of advanced cancers including malignant melanoma, non-small cell lung cancer, and renal cell carcinoma. However, these drugs also have immune-related adverse events (irAEs). The irAEs, which have unique characteristics different from those seen in conventional cytotoxic anti-tumor medicines, are observed in the several tissues such as skin, gastrointestinal tract, liver, lung, muscle, nerve and endocrine systems. To safely use immune checkpoint inhibitors, it is quite important to understand the characteristics of irAEs and to manage them in clinical practice. In this review, we focus on clinical characteristics and pathogenesis of adverse events in the pituitary gland.

DOI： 10.2177/jsci.40.90

Scopus

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1155/2017/1543149

Web of Science

PubMed

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1136/bcr.02.2010.2742

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1136/bcr.12.2009.2559

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1136/bcr.10.2008.1172

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese Book type：Scholarly book

Total pages：8   Responsible for pages：8   Language：Japanese

Total pages：5   Responsible for pages：5   Language：Japanese Book type：Dictionary, encyclopedia

Total pages：3   Responsible for pages：3   Language：Japanese

Total pages：3   Responsible for pages：3   Language：Japanese

Total pages：1   Responsible for pages：1   Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

Language：Japanese   Publisher：(一社)日本内分泌学会  

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：Elsevier Ireland Ltd  

Familial neurohypophysial diabetes insipidus (FNDI), characterized by progressive polyuria and loss of arginine vasopressin (AVP) neurons, is an autosomal dominant disorder caused by AVP gene mutations. Our previous studies with FNDI model mice demonstrated that mutant proteins accumulated in the endoplasmic reticulum (ER) of AVP neurons. Here, we examined therapeutic effects of the chemical chaperone 4-phenylbutylate (4-PBA) in FNDI mice. Treatment with 4-PBA reduced mutant protein accumulation in the ER of FNDI mice and increased AVP release, leading to reduced urine volumes. Furthermore, AVP neuron loss under salt loading was attenuated by 4-PBA treatment. These data suggest that 4-PBA ameliorated mutant protein accumulation in the ER of AVP neurons and thereby prevented FNDI phenotype progression.

DOI： 10.1016/j.neulet.2018.06.013

Scopus

PubMed

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：(一社)日本糖尿病学会  

Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

The anterior pituitary gland produces several hormones essential for regulation of the somatic endocrine system. Deficiency of these hormones can cause life-threatening diseases, including adrenal crisis. Pituitary tissue generated from human pluripotent stem cells is expected to provide better treatment than current hormone replacement therapy. During early mammalian development, the pituitary anlage (Rathke's pouch) develops from non-neural ectoderm adjacent to the developing ventral hypothalamus. The close interaction between these two tissues is crucial for Rathke's pouch development and involves several signaling molecules. Early exposure of human embryonic stem cells in 3D floating culture to sonic hedgehog and bone morphogenetic protein 4 promoted the cells' differentiation into oral ectoderm and, subsequently, hormone-producing cells such as corticotrophs (adrenocorticotropic hormone-producing cells). The differentiation approach described herein, which induces the formation of pituitary tissue in contact with hypothalamic neural tissue, mimics mammalian pituitary development. The differentiated corticotrophs are functional, responding normally to both release and feedback signals. © 2018 by John Wiley & Sons, Inc.

DOI： 10.1002/cpns.48

PubMed

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

Context: Immune checkpoint inhibitors, including anti-programmed cell death-1 (PD-1) antibodies, have become promising treatments for a variety of advanced malignancies. However, these medicines can cause immune-related adverse events (irAEs), including endocrinopathies. Objective: This study examined the incidence of endocrine irAEs induced by nivolumab. Patients and Main Outcome Measured: Sixty-six patients treated with nivolumab at Nagoya University Hospital were prospectively evaluated for pituitary hormones, thyroid function, antithyroid antibodies (Abs), and glucose levels every 6 weeks after the initiation of nivolumab for 24 weeks. Results: Four out of 66 patients developed destructive thyroiditis, and three patients developed hypothyroidism requiring levothyroxine replacement. The prevalence of positive anti-thyroglobulin Abs (TgAbs) and/or anti-thyroid peroxidase Abs (TPOAbs) at baseline was significantly higher in the group that developed destructive thyroiditis (3/4) compared with the group that did not develop thyroiditis (3/62; P = 0.002). There were no significant differences in other clinical variables between the groups. There were no endocrine irAEs other than destructive thyroiditis during the 24 weeks. The prevalence of TgAbs and/or TPOAbs at baseline was not associated with the development of other irAEs, including pneumonitis, colitis, or skin reactions. Conclusions: Our real-world data showed that destructive thyroiditis was an endocrine irAE that was frequently induced by nivolumab and was significantly associated with positive TgAbs and/or TPOAbs before treatment. Our findings indicate that evaluating these Abs before treatment may help identify patients with a high risk of thyroidal irAEs and may have important clinical benefit.

DOI： 10.1210/js.2017-00432

PubMed

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：(一社)日本病態栄養学会  

J-GLOBAL

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：ELSEVIER SCIENCE INC  

Excess carbohydrate intake causes obesity in humans. On the other hand, acute administration of fructose, glucose or sucrose in experimental animals has been shown to increase the plasma concentration of anti-obesity hormones such as glucagon-like peptide 1 (GLP-1) and Fibroblast growth factor 21 (FGF21), which contribute to reducing body weight. However, the secretion and action of GLP-1 and FGF21 in mice chronically fed a high-sucrose diet has not been investigated. To address the role of anti-obesity hormones in response to increased sucrose intake, we analyzed mice fed a high-sucrose diet, a high-starch diet or a normal diet for 15 weeks. Mice fed a high-sucrose diet showed resistance to body weight gain, in comparison with mice fed a high-starch diet or control diet, due to increased energy expenditure. Plasma FGF21 levels were highest among the three groups in mice fed a high-sucrose diet, whereas no significant difference in GLP-1 levels was observed. Expression levels of uncoupling protein 1 (UCP-1), FGF receptor 1c (FGFR1c) and beta-klotho (KLB) mRNA in brown adipose tissue were significantly increased in high sucrose-fed mice, suggesting increases in FGF21 sensitivity and energy expenditure. Expression of carbohydrate responsive element binding protein (ChREBP) mRNA in liver and brown adipose tissue was also increased in high sucrose-fed mice. These results indicate that FGF21 production in liver and brown adipose tissue is increased in high-sucrose diet and participates in resistance to weight gain. (C) 2017 The Authors. Published by Elsevier Inc.

DOI： 10.1016/j.jnutbio.2017.07.010

Web of Science

PubMed

Language：Japanese  

CiNii Books

Other Link： http://search.jamas.or.jp/link/ui/2017380517

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：Nagoya University  

The Internet of Things (IoT) allows collecting vast amounts of health-relevant data such as daily activity, body weight (BW), and blood pressure (BP) automatically. The use of IoT devices to monitor diabetic patients has been studied, but could not evaluate IoT-dependent effects because health data were not measured in control groups. This multicenter, open-label, randomized, parallel group study will compare the impact of intensive health guidance using IoT and conventional medical guidance on glucose control. It will be conducted in outpatients with type 2 diabetes for a period of 6 months. IoT devices to measure amount of daily activity, BW, and BP will be provided to IoT group patients. Healthcare professionals (HCPs) will provide appropriate feedback according to the data. Non-IoT control, patients will be given measurement devices that do not have a feedback function. The primary outcome is glycated hemoglobin at 6 months. The study has already enrolled 101 patients, 50 in the IoT group and 51 in the non-IoT group, at the two participating outpatient clinics. The baseline characteristics of two groups did not differ, except for triglycerides. This will be the first randomized, controlled study to evaluate IoT-dependent effects of intensive feedback from HCPs. The results will validate a new method of health-data collection and provision of feedback suitable for diabetes support with increased effectiveness and low cost.

DOI： 10.18999/nagjms.79.3.323

Scopus

PubMed

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：NAGOYA UNIV, SCH MED  

The Internet of Things (IoT) allows collecting vast amounts of health-relevant data such as daily activity, body weight (BW), and blood pressure (BP) automatically. The use of IoT devices to monitor diabetic patients has been studied, but could not evaluate IoT-dependent effects because health data were not measured in control groups. This multicenter, open-label, randomized, parallel group study will compare the impact of intensive health guidance using IoT and conventional medical guidance on glucose control. It will be conducted in outpatients with type 2 diabetes for a period of 6 months. IoT devices to measure amount of daily activity, BW, and BP will be provided to IoT group patients. Healthcare professionals (HCPs) will provide appropriate feedback according to the data. Non-IoT control, patients will be given measurement devices that do not have a feedback function. The primary outcome is glycated hemoglobin at 6 months. The study has already enrolled 101 patients, 50 in the IoT group and 51 in the non-IoT group, at the two participating outpatient clinics. The baseline characteristics of two groups did not differ, except for triglycerides. This will be the first randomized, controlled study to evaluate IoT-dependent effects of intensive feedback from HCPs. The results will validate a new method of health-data collection and provision of feedback suitable for diabetes support with increased effectiveness and low cost.

DOI： 10.18999/nagjms.79.3.323

Web of Science

PubMed

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：ELSEVIER IRELAND LTD  

Sequestosome 1 (SQSTM1) also known as ubiquitin-binding protein p62 (p62) is a cargo protein involved in the degradation of misfolded proteins via selective autophagy. Disruption of autophagy and resulting accumulation of misfolded proteins in the endoplasmic reticulum (ER) leads to ER stress. ER stress is implicated in several neurodegenerative diseases and obesity. As knockout of p62 (p62KO) reportedly induces obesity in mice, we examined how p62 contributes to ER stress and the ensuing unfolded protein response (UPR) in hypothalamus using mouse organotypic cultures in the present study. Cultures from p62KO mice showed significantly reduced formation of LC3-GFP puncta, an index of autophagosome formation, in response to the chemical ER stressor thapsigargin compared to wild-type (WT) cultures. Hypothalamic cultures from p62KO mice exhibited higher basal expression of the UPR/ER stress markers CHOP mRNA and ATF4 mRNA than WT cultures. Thapsigargin enhanced CHOP, ATF4, and BiP mRNA as well as p-elF2 alpha protein expression in both NWT and p62KO cultures, but all peak values were greater in p621(0 cultures. A proteasome inhibitor increased p62 expression in WT cultures and upregulated the UPR/ER stress markers CHOP mRNA and ATF4 mRNA in both genotypes, but to a greater extent in p62KO cultures. Therefore, p62 deficiency disturbed autophagosome formation and enhanced both basal and chemically induced ER stress, suggesting that p62 serves to prevent ER stress in mouse hypothalamus by maintaining protein folding capacity. (C) 2017 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.neulet.2017.06.014

Web of Science

PubMed

Language：Japanese  

CiNii Books

Other Link： http://search.jamas.or.jp/link/ui/2017253172

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：SPRINGER  

Purpose IgG4-related disease is a systemic inflammatory disease characterized by infiltration of IgG4-positive plasma cells into multiple organs, including the pituitary gland. Autoimmunity is thought to be involved in the pathogenesis of IgG4-related disease. The diagnosis of IgG4-related hypophysitis (IgG4-RH) is difficult because its clinical features, such as pituitary swelling and hypopituitarism, are similar to those of other pituitary diseases, including lymphocytic hypophysitis and sellar/suprasellar tumors. The presence and significance of anti-pituitary antibodies (APA) in IgG4-RH is unclear.
Methods In this case-control study, we used single indirect immunofluorescence on human pituitary substrates to assess the prevalence of serum APA in 17 patients with IgG4-RH, 8 control patients with other pituitary diseases (lymphocytic infundibulo-neurohypophysitis, 3; craniopharyngioma, 2; germinoma, 3), and 9 healthy subjects.We further analyzed the endocrine cells targeted by the antibodies using double indirect immunofluorescence.
Results APA were found in 5 of 17 patients with IgG4-RH (29%), and in none of the pituitary controls or healthy subjects. The endocrine cells targeted by the antibodies in the 5 IgG4-RH cases were exclusively corticotrophs. Antibodies were of the IgG1 subclass, rather than IgG4, in all 5 cases, suggesting that IgG4 is not directly involved in the pathogenesis. Finally, antibodies recognized pro-opiomelanocortin in 2 of the cases.
Conclusions Our study suggests that autoimmunity is involved in the pathogenesis of IgG4-RH and that corticotrophs are the main antigenic target, highlighting a possible new diagnostic marker for this condition.

DOI： 10.1007/s11102-016-0780-8

Web of Science

PubMed

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：AMER PHYSIOLOGICAL SOC  

S100 calcium-binding protein B (S100B), a multifunctional macromolecule mainly expressed in nerve tissues and adipocytes, has been suggested to contribute to the pathogenesis of obesity. To clarify the role of S100B in insulin action and glucose metabolism in peripheral tissues, we investigated the effect of S100B on glycolysis in myoblast and myotube cells. Rat myoblast L6 cells were treated with recombinant mouse S100B to examine glucose consumption, lactate production, glycogen accumulation, glycolytic metabolites and enzyme activity, insulin signaling, and poly(ADP-ribosyl)ation of glyceraldehyde-3-phosphate dehydrogenase (GAPDH). Glycolytic metabolites were investigated by enzyme assays or metabolome analysis, and insulin signaling was assessed by Western blot analysis. Enzyme activity and poly(ADP-ribosyl) ation of GAPDH was evaluated by an enzyme assay and immunoprecipitation followed by dot blot with an anti-poly(ADP-ribose) antibody, respectively. S100B significantly decreased glucose consumption, glucose analog uptake, and lactate production in L6 cells, in either the presence or absence of insulin. In contrast, S100B had no effect on glycogen accumulation and insulin signaling. Metabolome analysis revealed that S100B increased the concentration of glycolytic intermediates upstream of GAPDH. S100B impaired GAPDH activity and increased poly(ADP-ribosyl) ated GAPDH proteins. The effects of S100B on glucose metabolism were mostly canceled by a poly(ADP-ribose) polymerase inhibitor. Similar results were obtained in C2C12 myotube cells. We conclude that S100B as a humoral factor may impair glycolysis in muscle cells independent of insulin action, and the effect may be attributed to the inhibition of GAPDH activity from enhanced poly(ADP-ribosyl) ation of the enzyme.

DOI： 10.1152/ajpendo.00328.2016

Web of Science

PubMed

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE  

Hypothalamic insulin receptor signaling regulates energy balance and glucose homeostasis via agouti related protein (AgRP). While protein tyrosine phosphatase 1B (PTP1B) is classically known to be a negative regulator of peripheral insulin signaling by dephosphorylating both insulin receptor beta (IR beta) and insulin receptor substrate, the role of PTP1B in hypothalamic insulin signaling remains to be fully elucidated. In the present study, we investigated the role of PTP1B in hypothalamic insulin signaling using PTP1B deficient (KO) mice in vivo and ex vivo. For the in vivo study, hypothalamic insulin resistance induced by a high-fat diet (HFD) improved in KO mice compared to wild-type (WT) mice. Hypothalamic AgRP mRNA expression levels were also significantly decreased in KO mice independent of body weight changes. In an ex vivo study using hypothalamic organotypic cultures, insulin treatment significantly increased the phosphorylation of both IR beta and Akt in the hypothalamus of KO mice compared to WT mice, and also significantly decreased AgRP mRNA expression levels in KO mice. While incubation with inhibitors of phosphatidylinositol-3 kinase (PI3K) had no effect on basal levels of Akt phosphorylation, these suppressed insulin induction of Akt phosphorylation to almost basal levels in WT and KO mice. The inhibition of the PI3K-Akt pathway blocked the downregulation of AgRP mRNA expression in KO mice treated with insulin. These data suggest that PTP1B acts on the hypothalamic insulin signaling via the PI3K-Akt pathway. Together, our results suggest a deficiency of PTP1B improves hypothalamic insulin sensitivity resulting in the attenuation of AgRP mRNA expression under HFD conditions. (C) 2017 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.bbrc.2017.05.019

Web of Science

PubMed

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：(一社)日本内分泌学会  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Protein tyrosine phosphatase 1B (PTP1B) regulates leptin signaling in hypothalamic neurons via the JAK2-STAT3 pathway. PTP1B has also been implicated in the regulation of inflammation in the periphery. However, the role of PTP1B in hypothalamic inflammation, which is induced by a high-fat diet (HFD), remains to be elucidated. Here, we showed that STAT3 phosphorylation (p-STAT3) was increased in microglia in the hypothalamic arcuate nucleus of PTP1B knock-out mice (KO) on a HFD, accompanied by decreased Tnf and increased Il10 mRNA expression in the hypothalamus compared to wild-type mice (WT). In hypothalamic organotypic cultures, incubation with TNF alpha led to increased p-STAT3, accompanied by decreased Tnf and increased Il10 mRNA expression, in KO compared to WT. Incubation with p-STAT3 inhibitors or microglial depletion eliminated the differences in inflammation between genotypes. These data indicate an important role of JAK2-STAT3 signaling negatively regulated by PTP1B in microglia, which attenuates hypothalamic inflammation under HFD conditions. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

DOI： 10.1016/j.ebiom.2017.01.007

Web of Science

PubMed

Language：English  

Clozapine, a second-generation antipsychotic (SGA), is a cause of side effects related to metabolic syndrome. The participation of serotonin 5-HT2C and histamine H1 receptors in the central nervous system has been reported as a mechanism of the weight gain caused by clozapine. In the present study, we investigated the direct pharmacological action of clozapine on the 3T3-L1 adipocytes and compared it to that of blonanserin, an SGA with low affinity for both receptors. Short-term exposure to clozapine decreased secretion and mRNA expression of leptin. Long-term exposure decreased leptin as well as adiponectin secretion, and further increased lipid droplets accumulation. However, short- and long-term exposures to blonanserin did not affect these parameters. A selective serotonin 5-HT2C, but not a histamine H1, receptor antagonist enhanced the decreased secretion of leptin induced by short-term exposure to clozapine, but did not affect the increased accumulation of lipid droplets. Our findings indicate that clozapine, but not blonanserin, strongly and directly affected the secretion of adipokines, such as leptin, in adipocytes and caused adipocyte enlargement.

DOI： 10.1016/j.jphs.2017.01.004

PubMed

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE  

Selective apoptosis of granule cells in the hippocampal dentate gyrus (DG) of rats with bilateral adrenalectomy (ADX) and in patients who died of adrenal insufficiency has been reported. Although adrenal insufficiency is a common disease and is usually associated with hyponatremia, its effect on the central nervous system and in apoptosis in the hippocampus remain to be elucidated. Using rat models to represent clinical hyponatremia accompanying adrenal insufficiency, we show that reduced serum [Na+] was associated with selective apoptosis in the DG. Nine days after ADX, apoptotic cells were observed in the DG of rats whose serum [Na+] was &lt;125 mEq/L (moderate hyponatremia), but rarely in those whose serum [Na+] was 125 mEq/L or in normonatremic rats. Although all hyponatremic ADX rats survived following treatment with corticosterone and saline started 7 days after ADX when apoptosis had not yet occurred, selective apoptosis on day 9 was not prevented in moderately hyponatremic rats. Interestingly, treatment with memantine, a noncompetitive NMDAR antagonist, prevented the selective apoptosis in the DG in moderately hyponatremic, ADX rats, and improved electrophysiological dysfunction, including impaired basal synaptic transmission and long-term potentiation at the entorhinal cortex-DG synapses. These results demonstrated that in adrenal insufficient rats, hyponatremia was associated with apoptosis in the DG, and that memantine prevented the apoptosis and improved cell function. Our data imply the importance of assessing the possibility of neurological impairments after treatment with CORT in patients with moderate or severe hyponatremia accompanying adrenal insufficiency and that memantine may represent a beneficial therapeutic strategy to prevent neurological impairments in such patients. (C) 2016 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.expneurol.2016.08.007

Web of Science

PubMed

Language：Japanese   Publisher：(一社)日本糖尿病学会  

Language：Japanese   Publisher：(一社)日本内分泌学会  

J-GLOBAL

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

DOI： 10.1155/2017/1543149

PubMed

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

DOI： 10.2177/jsci.40.90

PubMed

Event date： 2020.10

Language：English  

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Event date： 2020.7

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Event date： 2020.7

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Event date： 2020.5

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Event date： 2019.6

Language：Japanese   Presentation type：Oral presentation (keynote)  

Venue：仙台   Country：Japan  

Event date： 2019.4

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：名古屋   Country：Japan  

Event date： 2019.4

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Israel   Country：Israel  

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：名古屋   Country：Japan  

Event date： 2018.4

Language：Japanese   Presentation type：Oral presentation (keynote)  

Venue：宮崎   Country：Japan  

Event date： 2018.2

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：浜松   Country：Japan  

Event date： 2017.11

Language：Japanese   Presentation type：Oral presentation (keynote)  

Venue：神戸   Country：Japan  

Event date： 2017.11

Language：Japanese   Presentation type：Oral presentation (keynote)  

Venue：神戸   Country：Japan  

Event date： 2017.7

Language：Japanese   Presentation type：Oral presentation (keynote)  

Venue：群馬   Country：Japan  

Event date： 2017.4

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：京都   Country：Japan  

Event date： 2017.3

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2016.11

Language：English   Presentation type：Oral presentation (keynote)  

Venue：大宮   Country：Japan  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (keynote)  

Venue：大宮   Country：Japan  

Event date： 2015.12

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：神戸   Country：Japan  

Event date： 2015.10

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：名古屋   Country：Japan  

Event date： 2015.9

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：仙台   Country：Japan  

Event date： 2014.10 - 2014.11

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2014.4

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：福岡   Country：Japan  

Event date： 2014.1

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：名古屋   Country：Japan  

Event date： 2013.10

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2013.7

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Bristol   Country：United Kingdom  

Event date： 2012.4

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2012.4

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：名古屋   Country：Japan  

Event date： 2011.9

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：淡路島   Country：Japan  

Event date： 2011.4

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：神戸   Country：Japan  

Event date： 2009.9

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2008.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2008.3

Language：English   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2008.7

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2007.7

Language：English   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2010.7

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：France  

Event date： 2007.6

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2007.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2007.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2006.10

Language：English   Presentation type：Poster presentation  

Event date： 2006.10

Language：English   Presentation type：Poster presentation  

Event date： 2006.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2006.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2006.5

Language：Japanese   Presentation type：Poster presentation  

Event date： 2006.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2005.11

Language：English   Presentation type：Poster presentation