Updated on 2024/03/28

写真a

 
FURUKAWA Kyohei
 
Organization
Graduate School of Bioagricultural Sciences Department of Animal Sciences Assistant Professor
Graduate School
Graduate School of Bioagricultural Sciences
Undergraduate School
School of Agricultural Sciences Department of Bioresource Sciences
Title
Assistant Professor
External link

Degree 3

  1. 博士(農学) ( 2019.3   東北大学 ) 

  2. 修士(農学) ( 2016.3   東北大学 ) 

  3. 学士 ( 2014.3   東北大学 ) 

Research History 6

  1. Nagoya University   Graduate School of Bioagricultural Sciences Department of Animal Sciences   Assistant Professor

    2023.7

  2. Tohoku University   Graduate School of Agricultural Science

    2023.4 - 2023.6

  3. Tohoku University   Graduate School of Agricultural Science

    2022.6 - 2023.3

  4. The University of Tokyo   Graduate School of Agricultural and Life Sciences

    2022.4 - 2022.9

  5. The University of Tokyo   Graduate School of Agricultural and Life Sciences

    2019.4 - 2022.3

  6. Tohoku University

    2016.4 - 2019.3

▼display all

Education 3

  1. Tohoku University   Graduate School of Agricultural Science

    2016.4 - 2019.3

  2. Tohoku University   Graduate School of Agricultural Science

    2014.4 - 2016.3

  3. Tohoku University   Faculty of Agriculture

    2010.4 - 2014.3

Awards 4

  1. 奨励賞

    2023.9   日本アミノ酸学会  

  2. 東北大学大学院 農学研究科 研究科長賞

    2019.3  

  3. 日本家禽学会第121回大会 優秀発表賞

    2018.9  

  4. 日本畜産学会第119回大会 若手優秀発表賞

    2015.3  

 

Papers 20

  1. FcRY is a key molecule controlling maternal blood IgY transfer to yolks during egg development in avian species. International journal

    Mayuko Okamoto, Ryo Sasaki, Koki Ikeda, Kasumi Doi, Fumiya Tatsumi, Kenzi Oshima, Takaaki Kojima, Shusei Mizushima, Keisuke Ikegami, Takashi Yoshimura, Kyohei Furukawa, Misato Kobayashi, Fumihiko Horio, Atsushi Murai

    Frontiers in immunology   Vol. 15   page: 1305587 - 1305587   2024

     More details

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

    Maternal immunoglobulin transfer plays a key role in conferring passive immunity to neonates. Maternal blood immunoglobulin Y (IgY) in avian species is transported to newly-hatched chicks in two steps: 1) IgY is transported from the maternal circulation to the yolk of maturing oocytes, 2) the IgY deposited in yolk is transported to the circulation of the embryo via the yolk sac membrane. An IgY-Fc receptor, FcRY, is involved in the second step, but the mechanism of the first step is still unclear. We determined whether FcRY was also the basis for maternal blood IgY transfer to the yolk in the first step during egg development. Immunohistochemistry revealed that FcRY was expressed in the capillary endothelial cells in the internal theca layer of the ovarian follicle. Substitution of the amino acid residue in Fc region of IgY substantially changed the transport efficiency of IgY into egg yolks when intravenously-injected into laying quail; the G365A mutant had a high transport efficiency, but the Y363A mutant lacked transport ability. Binding analyses of IgY mutants to FcRY indicated that the mutant with a high transport efficiency (G365A) had a strong binding activity to FcRY; the mutants with a low transport efficiency (G365D, N408A) had a weak binding activity to FcRY. One exception, the Y363A mutant had a remarkably strong binding affinity to FcRY, with a small dissociation rate. The injection of neutralizing FcRY antibodies in laying quail markedly reduced IgY uptake into egg yolks. The neutralization also showed that FcRY was engaged in prolongation of half-life of IgY in the blood; FcRY is therefore a multifunctional receptor that controls avian immunity. The pattern of the transport of the IgY mutants from the maternal blood to the egg yolk was found to be identical to that from the fertilized egg yolk to the newly-hatched chick blood circulation, via the yolk sac membrane. FcRY is therefore a critical IgY receptor that regulates the IgY uptake from the maternal blood circulation into the yolk of avian species, further indicating that the two steps of maternal-newly-hatched IgY transfer are controlled by a single receptor.

    DOI: 10.3389/fimmu.2024.1305587

    PubMed

  2. The Epigenetic Legacy of Maternal Protein Restriction: Renal Ptger1 DNA Methylation Changes in Hypertensive Rat Offspring

    Huijuan Jia, Moe Miyoshi, Xuguang Li, Kyohei Furukawa, Lila Otani, Katsuhiko Shirahige, Fumihito Miura, Takashi Ito, Hisanori Kato

    Nutrients   Vol. 15 ( 18 ) page: 3957 - 3957   2023.9

     More details

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

    Nutrient imbalances during gestation are a risk factor for hypertension in offspring. Although the effects of prenatal nutritional deficiency on the development of hypertension and cardiovascular diseases in adulthood have been extensively documented, its underlying mechanisms remain poorly understood. In this study, we aimed to elucidate the precise role and functional significance of epigenetic modifications in the pathogenesis of hypertension. To this end, we integrated methylome and transcriptome data to identify potential salt-sensitive hypertension genes using the kidneys of stroke-prone spontaneously hypertensive rat (SHRSP) pups exposed to a low-protein diet throughout their fetal life. Maternal protein restriction during gestation led to a positive correlation between DNA hypermethylation of the renal prostaglandin E receptor 1 (Ptger1) CpG island and high mRNA expression of Ptger1 in offspring, which is consistently conserved. Furthermore, post-weaning low-protein or high-protein diets modified the Ptger1 DNA hypermethylation caused by fetal malnutrition. Here, we show that this epigenetic variation in Ptger1 is linked to disease susceptibility established during fetal stages and could be reprogrammed by manipulating the postnatal diet. Thus, our findings clarify the developmental origins connecting the maternal nutritional environment and potential epigenetic biomarkers for offspring hypertension. These findings shed light on hypertension prevention and prospective therapeutic strategies.

    DOI: 10.3390/nu15183957

    Scopus

    PubMed

  3. Postnatal nutrition environment reprograms renal DNA methylation patterns in offspring of maternal protein-restricted stroke-prone spontaneously hypertensive rats. Reviewed International journal

    Chika Ando, Sihui Ma, Moe Miyoshi, Kyohei Furukawa, Xuguang Li, Huijuan Jia, Hisanori Kato

    Frontiers in nutrition   Vol. 10   page: 1134955 - 1134955   2023

     More details

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

    Maternal malnutrition hampers the offspring health by manipulating the epigenome. Recent studies indicate that the changes in DNA methylation could be reversed by afterbirth nutrition supplementation. In this study, we used DNA methylation arrays to comprehensively investigate the DNA methylation status of the renal promoter regions and the effects of postnatal protein intake on DNA methylation. We fed stroke-prone spontaneously hypertensive (SHRSP) rat dams a normal diet or a low-protein diet during pregnancy, and their 4-week-old male offspring were fed a normal diet or a high-/low-protein diet for 2 weeks. We found that the methylation status of 2,395 differentially methylated DNA regions was reprogrammed, and 34 genes were reset by different levels of postnatal protein intake in the offspring. Among these genes, Adora2b, Trpc5, Ar, Xrcc2, and Atp1b1 are involved in renal disease and blood pressure regulation. Our findings indicate that postnatal nutritional interventions can potentially reprogram epigenetic changes, providing novel therapeutic and preventive epigenetic targets for salt-sensitive hypertension.

    DOI: 10.3389/fnut.2023.1134955

    Scopus

    PubMed

  4. Association between Dietary Behaviors and BMI Stratified by Sex and the ALDH2 rs671 Polymorphism in Japanese Adults. Reviewed International journal

    Maki Igarashi, Shun Nogawa, Tsuyoshi Hachiya, Kyohei Furukawa, Shoko Takahashi, Huijuan Jia, Kenji Saito, Hisanori Kato

    Nutrients   Vol. 14 ( 23 )   2022.12

     More details

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

    The rs671 polymorphism, unique to East Asians, is well known to change the sensitivity to alcohol. Moreover, this polymorphism is associated not only with alcohol intake but also with several dietary behaviors (DBs), chronic diseases, and BMI, but the triadic association among the rs671 genotype, DBs, and BMI is unclear. This study included 12,271 Japanese subjects and aimed to observe this three-way association using the rs671 polymorphism, data of 56 DBs, and BMI. All analyses were stratified by participant sex. First, linear regression analyses resulted in significant associations between 18 and 21 DBs and BMI in males and females, respectively. Next, genetic heterogeneity was observed in all sub-groups via interaction analysis of the rs671 genotype stratified by drinking habits. Finally, we observed the characteristics of BMI-related DBs based on the rs671 genotype via stepwise regression analyses stratified by the rs671 genotype and drinking habits. Notably, positive associations were observed between lactobacillus beverage intake and BMI among participants with the rs671 polymorphism AA genotype in both sexes. This study suggests that the rs671 polymorphism modifies the association between DBs and BMI independently of drinking habits, providing evidence for the potential use of rs671 polymorphism information for precision nutrition with East Asians.

    DOI: 10.3390/nu14235116

    Scopus

    PubMed

  5. Suppressive Effects of Turmeric Extract on Muscle Atrophy in Dexamethasone-Treated Mice and Myotubes. Reviewed International journal

    Kyohei Furukawa, Marika Kousaka, Huijuan Jia, Hisanori Kato

    Nutrients   Vol. 14 ( 19 )   2022.9

     More details

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

    Sarcopenia is the decline in skeletal muscle mass, strength, and functions, which decreases the quality of life in elderly people. This study investigated the suppressive effect of turmeric (Curcuma longa) extract (TE) on muscle atrophy in dexamethasone (DEX)-treated mice and C2C12 myotubes. DEX treatment significantly decreased the muscle weight and significantly increased Fbxo32 and Murf1 expression in mice, and these changes were suppressed by the supplementation of an AIN-93 based diet with 2% TE. A similar pattern was observed in FBXO32 and MuRF1 protein expression. In C2C12 myotubes, DEX treatment significantly increased FBXO32 and MuRF1 gene and protein expression, and these increases were significantly suppressed by TE supplementation at a concentration of 200 µg/mL. Furthermore, one of the five TE fractions, which were separated by high-performance liquid chromatography had a similar effect with TE supplementation. The present study proposes the suppressive effect of turmeric on sarcopenia.

    DOI: 10.3390/nu14193979

    Scopus

    PubMed

  6. Eggshell membrane modulates gut microbiota to prevent murine pre-cachexia through suppression of T helper cell differentiation. Reviewed International journal

    Huijuan Jia, Weida Lyu, Kazuki Hirota, Eri Saito, Moe Miyoshi, Hirohiko Hohjoh, Kyohei Furukawa, Kenji Saito, Makoto Haritani, Akashi Taguchi, Yukio Hasebe, Hisanori Kato

    Journal of cachexia, sarcopenia and muscle   Vol. 13 ( 4 ) page: 2088 - 2101   2022.6

     More details

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

    BACKGROUND: Cachexia is a life-threatening condition observed in several pathologies, such as cancer or chronic diseases. Interleukin 10 (Il10) gene transfer is known to improve cachexia by downregulating Il6. Here, we used an IL10-knockout mouse model to simulate cachexia and investigate the effects of eggshell membrane (ESM), a resistant protein, on general pre-cachexia symptoms, which is particularly important for the development of cachexia therapeutics. METHODS: Five-week-old male C57BL6/J mice were fed an AIN-93G powdered diet (WT), and 5-week-old male B6.129P2-Il10 < tm1Cgn>/J (IL10-/- ) mice were fed either the AIN-93G diet (KO) or an 8% ESM-containing diet (KOE) for 28 weeks. The tissue weight and levels of anaemia-, blood glucose-, lipid metabolism-, and muscular and colonic inflammation-related biochemical markers were measured. Transcriptomic analysis on liver and colon mucus and proteomic analysis on skeletal muscle were performed. Ingenuity Pathway Analysis was used to identify molecular pathways and networks. Caecal short-chain fatty acids (SCFAs) were identified using HPLC, and caecal bacteria DNA were subjected to metagenomic analysis. Flow cytometry analysis was performed to measure the CD4+ IL17+ T cells in mesenteric lymph nodes. RESULTS: The body weight, weight of gastrocnemius muscle and fat tissues, colon weight/length ratio, plasma HDL and NEFA, muscular PECAM-1 levels (P < 0.01), plasma glucose and colonic mucosal myeloperoxidase activity (P < 0.05) and T helper (Th) 17 cell abundance (P = 0.071) were improved in KOE mice over KO mice. Proteomic analysis indicated the protective role of ESM in muscle weakness and maintenance of muscle formation (>1.5-fold). Transcriptomic analysis revealed that ESM supplementation suppressed the LPS/IL1-mediated inhibition of RXR function pathway in the liver and downregulated the colonic mucosal expression of chemokines and Th cell differentiation-related markers (P < 0.01) by suppressing the upstream BATF pathway. Analysis of the intestinal microenvironment revealed that ESM supplementation ameliorated the microbial alpha diversity and the abundance of microbiota associated with the degree of inflammation (P < 0.05) and increased the level of total organic acids, particularly of SCFAs such as butyrate (2.3-fold), which could inhibit Th1 and Th17 production. CONCLUSIONS: ESM supplementation ameliorated the chief symptoms of cachexia, including anorexia, lean fat tissue mass, skeletal muscle wasting and reduced physical function. ESM also improved colon and skeletal muscle inflammation, lipid metabolism and microbial dysbiosis. These results along with the suppressed differentiation of Th cells could be associated with the beneficial intestinal microenvironment and, subsequently, attenuation of pre-cachexia. Our findings provide insights into the potential of ESM in complementary interventions for pre-cachexia prevention.

    DOI: 10.1002/jcsm.13019

    Scopus

    PubMed

  7. Oxidation of amino acids, glucose, and fatty acids as metabolic fuels in enterocytes of post-hatching developing chickens. Reviewed International coauthorship International journal

    Wenliang He, Kyohei Furukawa, Christopher A Bailey, Guoyao Wu

    Journal of animal science   Vol. 100 ( 4 )   2022.2

     More details

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

    This study determined the oxidation of amino acids, glucose and fatty acid in enterocytes of developing chickens. Jejunal enterocytes were isolated from 0-, 7-, 21- and 42-d-old broiler chickens, and incubated at 40℃ for 30 min in Krebs-Henseleit bicarbonate buffer (pH 7.4) containing 5 mM D-glucose and one of the following: 0.5-5 mM L-[U- 14C]glutamate, 0.5-5 mM L-[U- 14C]glutamine, 0.5-5 mM L-[U- 14C]aspartate, 0.5-5 mM L-[U- 14C]alanine, 0.5-2 mM L-[U- 14C]palmitate, D-[U- 14C]glucose, 0.5-5 mM [U- 14C]propionate, and 0.5-5 mM [1- 14C]butyrate. 14CO2 produced from each 14C-labeled substrate was collected for determination of radioactivity. Among all the substrates studied, glutamate had the greatest rate of oxidation in enterocytes from 0- to 42-d-old chickens. Glutamate transaminases, rather than glutamate dehydrogenase, may be primarily responsible for initiating glutamate degradation. Rates of amino acid and fatty acid oxidation by cells increased (P ˂ 0.05) with increasing their extracellular concentrations from 0.5 to 5 mM. Rates of glutamate and glucose oxidation in enterocytes decreased (P ˂ 0.05) with increasing age, and rates of glutamine, aspartate, propionate and butyrate oxidation were lower (P ˂ 0.05) in 42-d-old chickens than in 0-d-old chickens. By contrast, oxidation of palmitate at 2 mM increased (P ˂ 0.05) by 118% in cells from 42-d-old chickens, compared with 0-d-old chickens. Compared with glutamate, oxidation of glutamine, aspartate, alanine, propionate, butyrate and palmitate was limited in cells from all age groups of chickens. Collectively, these results indicate that glutamate is the major metabolic fuel in enterocytes of 0- to 42-d-old chickens.

    DOI: 10.1093/jas/skac053

    Scopus

    PubMed

  8. Polyamine synthesis from arginine and proline in tissues of developing chickens. Reviewed International coauthorship International journal

    Kyohei Furukawa, Wenliang He, Christopher A Bailey, Fuller W Bazer, Masaaki Toyomizu, Guoyao Wu

    Amino acids   Vol. 53 ( 11 ) page: 1739 - 1748   2021.10

     More details

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

    Polyamines (putrescine, spermidine, and spermine) are synthesized primarily from ornithine via ornithine decarboxylase (ODC) in mammals. Although avian tissues contain ODC activity, little is known about intracellular sources of ornithine for their polyamine synthesis. This study tested the hypothesis that arginase and proline oxidase contribute to polyamine synthesis in chickens. Kidney, jejunum, leg muscle, and liver from 0-, 7-, 14- and 21-day-old broiler chickens were assayed for the activities of arginase, proline oxidase (POX), ornithine aminotransferase (OAT), and ornithine decarboxylase (ODC). Kidney slices were also used to determine 14C-polyamine synthesis from [U-14C]arginine and [U-14C]proline. Furthermore, these tissues and plasma were analyzed for polyamines. Results indicate that all tissues contained OAT (mitochondrial) and ODC (cytosolic) activities, but arginase and POX activities were only detected in the mitochondria of chicken kidneys. Renal POX and arginase activities were greater at 7 days of age compared to newly hatched birds, and declined by Day 14. Renal arginase activity was greater at 21 days compared to 14 days of age, but there was no change in renal POX activity during that same period. Concentrations of polyamines in the kidneys and plasma were greater on Day 7 compared to Day 0 and decreased thereafter on Days 14 and 21. Kidney slices readily converted arginine and proline into polyamines, with peak rates being on Day 7. Concentrations of putrescine, spermidine and spermine in the plasma of chickens were about 20- to 100-fold greater than those in mammals. Our results indicate that polyamines are synthesized from arginine and proline in avian kidneys. Unlike mammals, polyamines released from the kidneys are likely the major source of polyamines in the blood and other extra-renal tissues in chickens.

    DOI: 10.1007/s00726-021-03084-7

    Scopus

    PubMed

  9. Interorgan Metabolism, Nutritional Impacts, and Safety of Dietary L-Glutamate and L-Glutamine in Poultry. Reviewed International journal

    Wenliang He, Kyohei Furukawa, Masaaki Toyomizu, Tomonori Nochi, Christopher A Bailey, Guoyao Wu

    Advances in experimental medicine and biology   Vol. 1332   page: 107 - 128   2021.7

     More details

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

    L-glutamine (Gln) is the most abundant amino acid (AA) in the plasma and skeletal muscle of poultry, and L-glutamate (Glu) is among the most abundant AAs in the whole bodies of all avian tissues. During the first-pass through the small intestine into the portal circulation, dietary Glu is extensively oxidized to CO2, but dietary Gln undergoes limited catabolism in birds. Their extra-intestinal tissues (e.g., skeletal muscle, kidneys, and lymphoid organs) have a high capacity to degrade Gln. To maintain Glu and Gln homeostasis in the body, they are actively synthesized from branched-chain AAs (abundant AAs in both plant and animal proteins) and glucose via interorgan metabolism involving primarily the skeletal muscle, heart, adipose tissue, and brain. In addition, ammonia (produced from the general catabolism of AAs) and α-ketoglutarate (α-KG, derived primarily from glucose) serve as substrates for the synthesis of Glu and Gln in avian tissues, particularly the liver. Over the past 20 years, there has been growing interest in Glu and Gln metabolism in the chicken, which is an agriculturally important species and also a useful model for studying some aspects of human physiology and diseases. Increasing evidence shows that the adequate supply of dietary Glu and Gln is crucial for the optimum growth, anti-oxidative responses, productivity, and health of chickens, ducklings, turkeys, and laying fowl, particularly under stress conditions. Like mammals, poultry have dietary requirements for both Glu and Gln. Based on feed intake, tissue integrity, growth performance, and health status, birds can tolerate up to 12% Glu and 3.5% Gln in diets (on the dry matter basis). Glu and Gln are quantitatively major nutrients for chickens and other avian species to support their maximum growth, production, and feed efficiency, as well as their optimum health and well-being.

    DOI: 10.1007/978-3-030-74180-8_7

    Scopus

    PubMed

  10. Effects of Eggshell Membrane on Keratinocyte Differentiation and Skin Aging In Vitro and In Vivo Reviewed

    Kyohei Furukawa, Masaya Kono, Tetsuro Kataoka, Yukio Hasebe, Huijuan Jia, Hisanori Kato

    Nutrients   Vol. 13 ( 7 ) page: 2144 - 2144   2021.6

     More details

    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:{MDPI} {AG}  

    DOI: 10.3390/nu13072144

    Scopus

  11. In vivo emergence of beige-like fat in chickens as physiological adaptation to cold environments. Reviewed International journal

    Rina Sotome, Akira Hirasawa, Motoi Kikusato, Taku Amo, Kyohei Furukawa, Anna Kuriyagawa, Kouichi Watanabe, Anne Collin, Hitoshi Shirakawa, Ryota Hirakawa, Yuta Tanitaka, Hideki Takahashi, Guoyao Wu, Tomonori Nochi, Tsuyoshi Shimmura, Craig H Warden, Masaaki Toyomizu

    Amino acids   Vol. 53 ( 3 ) page: 381 - 393   2021.2

     More details

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

    While it has been hypothesized that brown adipocytes responsible for mammalian thermogenesis are absent in birds, the existence of beige fat has yet to be studied directly. The present study tests the hypothesis that beige fat emerges in birds as a mechanism of physiological adaptation to cold environments. Subcutaneous neck adipose tissue from cold-acclimated or triiodothyronine (T3)-treated chickens exhibited increases in the expression of avian uncoupling protein (avUCP, an ortholog of mammalian UCP2 and UCP3) gene and some known mammalian beige adipocyte-specific markers. Morphological characteristics of white adipose tissues of treated chickens showed increased numbers of both small and larger clusters of multilocular fat cells within the tissues. Increases in protein levels of avUCP and mitochondrial marker protein, voltage-dependent anion channel, and immunohistochemical analysis for subcutaneous neck fat revealed the presence of potentially thermogenic mitochondria-rich cells. This is the first evidence that the capacity for thermogenesis may be acquired by differentiating adipose tissue into beige-like fat for maintaining temperature homeostasis in the subcutaneous fat 'neck warmer' in chickens exposed to a cold environment.

    DOI: 10.1007/s00726-021-02953-5

    Scopus

    PubMed

  12. Possible role of corticosterone in proteolysis, glycolytic, and amino acid metabolism in primary cultured avian myotubes incubated at high-temperature conditions. Reviewed International journal

    Kyohei Furukawa, Masaaki Toyomizu, Motoi Kikusato

    Domestic animal endocrinology   Vol. 76   page: 106608 - 106608   2021.1

     More details

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

    Excess glucocorticoid secretion induces oxidative damage and muscle proteolysis and modulates glucose and lipid metabolism. It is known that the high-temperature (HT) treatment enhances corticosterone (CORT) secretion, muscle proteolysis, and mitochondrial reactive oxygen species (mtROS) generation in chickens. The present study investigated the co-effects of CORT on proteolysis and mtROS production, together with glucose, fatty acid, and amino acid metabolism in HT-treated cells. Myoblast cells were isolated from the major pectoralis muscle of five 0- or 1-day-old neonatal chicks and were precultured at 37°C/CO2 conditions for 48 h to reach subconfluent (80%-90%) conditions. Cells were then reseeded onto a 6- or 24-well microplate for the subsequent measurement, followed by the culture under a control temperature (37°C, control) or HT (41°C) conditions for 1 or 6 h. The HT-treated cells were cocultured with physiologically relevant concentrations of CORT (20 ng/mL in dimethyl sulfoxide). The HT treatment decreased cellular protein content (P < 0.05) and increased atrogin-1 mRNA levels and mtROS generation levels compared to the control group (P < 0.05), whereas HT/CORT co-treatment did not induce changes in either parameter. The mRNA level of glucose transporter-1 was decreased in HT-treated cells compared to that in normal cells (P < 0.05), and the decrease was increased in the CORT co-treatment (P < 0.05). While HT treatment did not alter pyruvate dehydrogenase kinase-4 mRNA level, the level was increased in the CORT co-treatment compared to the control and HT-treated cells (P < 0.05). Neither HT nor HT/CORT treatments altered the mRNA levels of fatty acid oxidation-related factors, carnitine palmitoyl transferase-1, and cluster of differentiation 36. The study conducted a metabolic analysis using gas chromatography-mass spectrometry. The results showed that HT/CORT-treated cells had decreased intracellular citrate and α-ketoglutarate levels (P < 0.05) and increased extracellular alanine and amino acid that have gluconeogenic properties, as well as increased aspartate, isoleucine, serine, methionine, and threonine levels (P < 0.05) compared to HT-treated cells. These results suggest that CORT may not affect proteolysis and mtROS production but can suppress pyruvate oxidation and promote alanine production in HT-treated chickens.

    DOI: 10.1016/j.domaniend.2021.106608

    Scopus

    PubMed

  13. A Genome-Wide Association Study Identifies the Association between the 12q24 Locus and Black Tea Consumption in Japanese Populations Reviewed

    Kyohei Furukawa, Maki Igarashi, Huijuan Jia, Shun Nogawa, Kaoru Kawafune, Tsuyoshi Hachiya, Shoko Takahashi, Kenji Saito, Hisanori Kato

    Nutrients   Vol. 12 ( 10 ) page: 3182 - 3182   2020.10

     More details

    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:{MDPI} {AG}  

    Several genome-wide association studies (GWASs) have reported the association between genetic variants and the habitual consumption of foods and drinks; however, no association data are available regarding the consumption of black tea. The present study aimed to identify genetic variants associated with black tea consumption in 12,258 Japanese participants. Data on black tea consumption were collected by a self-administered questionnaire, and genotype data were obtained from a single nucleotide polymorphism array. In the discovery GWAS, two loci met suggestive significance (p &lt; 1.0 × 10−6). Three genetic variants (rs2074356, rs144504271, and rs12231737) at 12q24 locus were also significantly associated with black tea consumption in the replication stage (p &lt; 0.05) and during the meta-analysis (p &lt; 5.0 × 10−8). The association of rs2074356 with black tea consumption was slightly attenuated by the additional adjustment for alcohol drinking frequency. In conclusion, genetic variants at the 12q24 locus were associated with black tea consumption in Japanese populations, and the association is at least partly mediated by alcohol drinking frequency.

    DOI: 10.3390/nu12103182

    Scopus

  14. Heat Stress Causes Immune Abnormalities via Massive Damage to Effect Proliferation and Differentiation of Lymphocytes in Broiler Chickens Reviewed

    Ryota Hirakawa, Siti Nurjanah, Kyohei Furukawa, Atsushi Murai, Motoi Kikusato, Tomonori Nochi, Masaaki Toyomizu

    Frontiers in Veterinary Science   Vol. 7   page: 46   2020

     More details

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

    © Copyright © 2020 Hirakawa, Nurjanah, Furukawa, Murai, Kikusato, Nochi and Toyomizu. Broiler chickens are highly sensitive to high ambient temperatures due to their feathers, lack of skin sweat glands, and high productivity. Heat stress (HS) is a major concern for the poultry industry because it negatively affects growth as well as immune functions, which increase the potential risk of infectious disease outbreaks. Therefore, it is vital to elucidate HS's effect on the avian immune system, especially considering the global rise in average surface temperature. Our study identified a series of immunological disorders in heat-stressed broiler chickens. We exposed 22-day-old broiler chickens to a continuous HS condition (34.5 ± 0.5°C) for 14 days and immunized them with a prototype bovine serum albumin (BSA) antigen. The plasma and lymphoid tissues (thymus, bursa of Fabricius, and spleen) were harvested at the end of the experiments to investigate the induction of BSA-specific immune responses. Our results revealed that plasma titers of immunoglobulin (Ig)Y, IgM, and IgA antibodies specific for BSA were lower than those of thermoneutral chickens immunized with BSA. Furthermore, the spleens of the heat-stressed broiler chickens displayed severe depression of Bu1+ B cells and CD3+ T cells, including CD4+ T cells and CD8+ T cells, and lacked a fully developed germinal center (GC), which is crucial for B cell proliferation. These immunological abnormalities might be associated with severe depression of CD4−CD8− or CD4+CD8+ cells, which are precursors of either helper or killer T cells in the thymus and Bu1+ B cells in the bursa of Fabricius. Importantly, HS severely damaged the morphology of the thymic cortex and bursal follicles, where functional maturation of T and B cells occur. These results indicate that HS causes multiple immune abnormalities in broiler chickens by impairing the developmental process and functional maturation of T and B cells in both primary and secondary lymphoid tissues.

    DOI: 10.3389/fvets.2020.00046

    Scopus

    PubMed

  15. Eggshell membrane powder lowers plasma triglyceride and liver total cholesterol by modulating gut microbiota and accelerating lipid metabolism in high-fat diet-fed mice Reviewed

    Nurul Shazini Ramli, Huijuan Jia, Ayumu Sekine, Weida Lyu, Kyohei Furukawa, Kenji Saito, Yukio Hasebe, Hisanori Kato

    Food Science and Nutrition   Vol. 8 ( 5 ) page: 2512 - 2523   2020

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 The Authors. Food Science & Nutrition published by Wiley Periodicals, Inc. Obesity is a major global lifestyle disorder associated with gut microbiota. The health benefits of eggshell membrane (ESM) have been shown in previous reports, particularly as regards gut microbiota composition. Here, we investigated whether ESM improves lipid metabolism and alters gut microbiota in high-fat diet-fed mice. A total of 20 C57BL/6J mice aged 6 weeks were given either a control diet (CON), high-fat diet (HFD), or high-fat diet + 8% ESM powder (HESM) for 20 weeks. ESM supplementation in HFD-fed mice reduced plasma triglycerides (TG) and liver total cholesterol (TC) and upregulated the expression of lipid metabolism genes carnitine palmitoyltransferase 1A and suppressor of cytokine signaling 2. Microbiota analysis showed increased relative abundance of the anti-obesity bacterium, Lactobacillus reuteri, at 4, 12, and 16 weeks and reduced the abundance of inflammation-related Blautia hydrogenotrophica, Roseburia faecis, and Ruminococcus callidus at 12 and 20 weeks. ESM-supplemented mice had increased cecal isobutyrate, negatively correlated with B. hydrogenotrophica and Parabacteroides goldsteinii abundance. The results indicate that ESM supplementation in HFD-fed mice reduced plasma TG and liver TC, possibly through alteration of lipid metabolism gene expression and gut microbiota composition, suggesting that ESM may be effective in obesity management.

    DOI: 10.1002/fsn3.1545

    Scopus

  16. Effects of low-dose oleuropein diet supplementation on the oxidative status of skeletal muscles and plasma hormonal concentration of growing broiler chickens Reviewed

    R. Shimao, H. Muroi, K. Furukawa, M. Toyomizu, M. Kikusato

    British Poultry Science   Vol. 60 ( 6 ) page: 784 - 789   2019.11

     More details

    Publishing type:Research paper (scientific journal)  

    © 2019, © 2019 British Poultry Science Ltd. 1. Oleuropein (Ole) is a major phenolic compound in Olea europaea, with anti-oxidative, anti-obesity, and anti-inflammatory properties. To explore the effect of Ole on the physiology and metabolism of poultry, this study, evaluated the effects of feeding low-dose Ole on the growth performance, metabolic hormonal status, muscle oxidative status in growing broiler chickens. 2. Thirty-two 8-day-old chickens were assigned to four different treatments, and fed either 0 (control), 0.1, 0.5, or 2.5 ppm Ole-supplemented diets for 2 weeks. 3. There were no differences in the body weight gain, feed consumption, and feed efficiency during the feeding periods between the groups tested. Birds fed Ole 0.5- and 2.5 ppm-supplemented diets exhibited a significant decrease in muscle carbonyl content compared to the control group. In the group fed Ole 0.5 ppm, the mRNA expression levels of mitochondrial ROS-reducing factors: avian uncoupling protein and manganese superoxide dismutase, as well as peroxisome proliferator-activated receptor γ coactivator 1-α, sirtuin-1 and −3 (each of which co-ordinately induce the transcription of the previous two factors) were upregulated compared to the control group, and the changes were independent of plasma noradrenaline and thyroid hormone levels. The group fed Ole-2.5 ppm did not show such transcriptional changes, but exhibited a higher corticosterone concentration. 4. This study demonstrates that ingesting a low dose of Ole can reduce muscle oxidative damage, and that the suppression machinery may differ depending on the amount of Ole ingested by growing broiler chickens.

    DOI: 10.1080/00071668.2019.1662886

    Scopus

    PubMed

  17. Nutritional regulation of mitochondrial ROS production of chickens exposed to acute and chronic heat stress

    M. Toyomizu, A. Mujahid, R. Hirakawa, K. Furukawa, M. A.K. Azad, M. Taciak, M. Kikusato

    EAAP Scientific Series   Vol. 138   page: 73 - 81   2019

     More details

    Publishing type:Research paper (scientific journal)  

    Harmful effects of heat stress on organisms are a matter of concern for environmental health and global warming. High ambient temperature, whether it is ‘acute' or ‘chronic' in nature, constitutes a significant hindrance to the growth of animals. Heat-induced reactive oxygen species (ROS) formation may be a factor that causes molecular changes in DNA, proteins, lipids and other biological molecules. To create a method for nutritional regulation of ROS production and protein degradation of skeletal muscle in heat-stressed chickens, we focused on elucidating underlying effects of heat stress on ROS production of skeletal muscle with two models to identify conditions for making broiler chickens more tolerant to heat stress. ‘Acute' heat stress in broiler chickens under 34 °C conditions induces increased mitochondrial ROS production via increased β-oxidation and downregulation of the avian form of mitochondrial uncoupling protein (avUCP), resulting in higher oxidative damage to mitochondrial proteins and lipids. Similarly, ‘chronic' heat stress induces increased ROS production in skeletal muscle mitochondria, probably via elevation of the membrane potential DY in state 4, resulting from enhanced oxygen consumption in the initial stage of heat exposure. However, animals can become acclimatized to environmental heat stress. Muscle protein degradation can occur after a short time (3 d) after heat exposure and this may be due to the activation of ubiquitination by atrogin-1 involved with mitochondrial ROS production. Nutritional regulation of ROS production and protein degradation, such as via enhanced avUCP gene expression, are important for making broiler chickens more tolerant to heat stress.

    DOI: 10.3920/978-90-8686-891-9_5

    Scopus

  18. Oleuropein induces mitochondrial biogenesis and decreases reactive oxygen species generation in cultured avian muscle cells, possibly via an up-regulation of peroxisome proliferator-activated receptor γ coactivator-1α Reviewed

    Motoi Kikusato, Hikaru Muroi, Yuichiro Uwabe, Kyohei Furukawa, Masaaki Toyomizu

    Animal Science Journal   Vol. 87 ( 11 ) page: 1371 - 1378   2016.11

     More details

    Publishing type:Research paper (scientific journal)  

    © 2016 Japanese Society of Animal Science It has been shown that oleuropein, a phenolic compound in the fruit and leaves of the olive tree (Olea europaea) induces mammalian uncoupling protein 1 (UCP1) expression via an increased secretion of noradrenaline and adrenaline. This study investigated the effects of oleuropein on avian UCP (avUCP) expression as well as genes related to mitochondrial oxidative phosphorylation and biogenesis in cultured avian muscle cells, together with reactive oxygen species generation. Oleuropein induced avUCP as well as peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α), nuclear respiratory factor-1 (NRF1), mitochondrial transcription factor A (TFAM) and ATP5a1 (a component of mitochondrial adenosine triphosphate synthase) gene expression and cytochrome c oxidase activity, indicating the induction of mitochondrial biogenesis. Sirtuin-1 (SIRT1) gene expression was also up-regulated by this compound, which could contribute to an increase in PGC-1α activity. Oleuropein suppressed the level of superoxide generation per mitochondrion, possibly via the up-regulation of avUCP and manganese superoxide dismutase (MnSOD) expression. Based on these findings, this study is the first to show that oleuropein may induce avUCP expression in avian muscle cells independent of the catecholamines, in which PGC-1α may be involved.

    DOI: 10.1111/asj.12559

    Scopus

    PubMed

  19. Time-course changes in muscle protein degradation in heat-stressed chickens: Possible involvement of corticosterone and mitochondrial reactive oxygen species generation in induction of the ubiquitin-proteasome system Reviewed

    Kyohei Furukawa, Motoi Kikusato, Tomomi Kamizono, Masaaki Toyomizu

    General and Comparative Endocrinology   Vol. 228   page: 105 - 110   2016.3

     More details

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

    © 2016 Elsevier Inc. Heat stress (HS) induces muscle protein degradation as well as production of mitochondrial reactive oxygen species (ROS). In the present study, to improve our understanding of how protein degradation is induced by HS treatment in birds, a time course analysis of changes in the circulating levels of glucocorticoid and Nτ-methylhistidine, muscle proteolysis-related gene expression, and mitochondrial ROS generation, was conducted. At 25 days of age, chickens were exposed to HS conditions (33 °C) for 0, 0.5, 1 or 3 days. While no alteration in plasma Nτ-methylhistidine concentration relative to that of the control group was observed in the 0.5 day HS group, the concentration was significantly higher in the 3-d HS treatment group. Plasma corticosterone concentrations increased in response to 0.5-d HS treatment, but subsequently returned to near-normal values. HS treatment for 0.5 days did not change the levels of μ-calpain, cathepsin B, or proteasome C2 subunit mRNA, but increased the levels of mRNA encoding atrogin-1 (P < 0.05) and its transcription factor, forkhead box O3 (P = 0.09). Under these hyperthermic conditions, mitochondrial superoxide production was significantly increased than that of thermoneutral control. Here, we show that HS-induced muscle protein degradation may be due to the activation of ubiquitination by atrogin-1, and that this process may involve mitochondrial ROS production as well as corticosterone secretion.

    DOI: 10.1016/j.ygcen.2016.02.007

    Scopus

    PubMed

  20. Possible involvement of mitochondrial reactive oxygen species production in protein degradation induced by heat stress in avian muscle cells Reviewed

    Kyohei Furukawa, Motoi Kikusato, Tomomi Kamizono, Hayami Yoshida, Masaaki Toyomizu

    Journal of Poultry Science   Vol. 52 ( 4 ) page: 260 - 267   2015.10

     More details

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

    � 2015, Japan Poultry Science Association. Heat stress (HS) stimulates mitochondrial reactive oxygen species (ROS) production and protein degradation in skeletal muscle. The present study investigated the stimulatory effects of HS-induced mitochondrial ROS production on the ubiquitin-proteasome protein degradation system in primary cultured avian muscle cells. Cells were isolated from the breast muscle of neonatal chicks, and then grown for 48 h. Thereafter, the cells were subjected to 37�C or 41�C (HS). Exposure to 6 h of HS treatment significantly decreased the cellular protein content compared to that of normal cells, an effect was completely suppressed by the addition of a proteasome-specific inhibitor. Whereas the mRNA levels of the 20S proteasome C2 subunit, which is one of the subunits of the 26S proteasome, did not change at any time during HS treatment (1, 3, 6 h), the mRNA levels of atrogin-1 and muscle ring-finger protein 1, both of which are muscle-specific ubiquitin ligases, increased after 1 h of HS but then decreased to near-normal values with time. Intracellular ROS production (the sum of H2O2, hydroxyl radicals, peroxyl radicals, peroxynitrite) did not change in the 1 h HS-exposed cells, but was significantly increased after 3 h and 6 h of HS. Mitochondrial superoxide production was significantly increased after 1 h of HS, which might increase the mRNA expression of ubiquitin ligase in muscle cells. In cells pretreated with 4-hydroxy TEMPO, which is able to decrease mitochondrial superoxide production, the increases in mitochondrial superoxide production and ubiquitin ligase mRNA levels observed after 1 h of HS were suppressed. The protein content of these cells was not decreased, which was observed after the longest period of HS (6 h). These findings suggest that mitochondrial superoxide production may play an important role in activating the ubiquitin-proteasome system, probably via the induction of ubiquitin ligases, in HS-exposed muscle cells.

    DOI: 10.2141/jpsa.0150028

    Scopus

▼display all

MISC 24

  1. アルコール感受性一塩基多型はヒトおよびマウスの嗜好性に影響する

    五十嵐麻希, 野川駿, 中出恵梨香, 中出恵梨香, 近都航太, 近都航太, 古川恭平, 煙山紀子, 福井由宇子, 高田修治, 八谷剛史, 八谷剛史, 高橋祥子, 斉藤憲司, 斉藤憲司, 賈慧娟, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 76th   2022

     More details

  2. クロセチンが酸化ストレス状況下の肝細胞および脂肪細胞に与える影響

    古川恭平, 齋藤柚里, 賈慧娟, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 75th   2021

     More details

  3. 日本人集団における一塩基多型と緑茶摂取量の関連解析

    染谷駿一, 野川駿, 五十嵐麻希, 古川恭平, 八谷剛史, 八谷剛史, 賈慧娟, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 75th   2021

     More details

  4. 妊娠期の低タンパク質食給餌が胎仔組織中のアミノ酸およびポリアミン濃度におよぼす影響

    古川恭平, 三好萌, 賈慧娟, 加藤久典

    アミノ酸研究   Vol. 14 ( 1 )   2021

     More details

  5. 卵殻膜成分によるケラチノサイトの分化促進効果の検討

    片岡哲郎, 古川恭平, 河野誠也, 長谷部由紀夫, 賈慧娟, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 75th   2021

     More details

  6. 個別化栄養を目指した飲酒関連一塩基多型の遺伝型別・食行動とBMIの特徴解析

    五十嵐麻希, 野川駿, 古川恭平, 八谷剛史, 八谷剛史, 高橋祥子, 斉藤憲司, 斉藤憲司, 賈慧娟, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 75th   2021

     More details

  7. マルチオミクス解析を用いたコリアンダーの炎症性腸疾患の抑制メカニズムの検討

    古川恭平, 賈慧娟, 斉藤憲司, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 74th   2020

     More details

  8. ラット離乳後のタンパク質摂取量が胎児期低栄養により生じるDNAメチル化に与える影響

    三好萌, 古川恭平, 賈慧娟, 加藤久典

    日本栄養・食糧学会大会講演要旨集   Vol. 74th   2020

     More details

  9. 急性暑熱感作時における肉用鶏の小胞体ストレス応答の解析

    高梨涼, 徳武優佳子, 徳武優佳子, 古川恭平, 谷高優太, 喜久里基, 喜久里基, 豊水正昭, 豊水正昭

    日本畜産学会大会講演要旨   Vol. 125th   2019

     More details

  10. 暑熱環境下のニワトリにおける液性免疫機能低下機序の解明

    平川良太, 野地智法, 喜久里基, 古川恭平, 村井篤嗣, 豊水正昭

    日本畜産学会大会講演要旨   Vol. 125th   2019

     More details

  11. Heat stress-induced muscle proteolytic mechanism and the nutritional regulation in broiler chickens

      Vol. 63 ( 1 ) page: 43 - 53   2019

     More details

    Language:Japanese  

    CiNii Books

    J-GLOBAL

  12. 暑熱感作鶏の骨格筋タンパク質分解に対するグルタミン・グルタミン酸同時給与の抑制効果

    古川恭平, 喜久里基, WU Guoyao, 豊水正昭

    日本家禽学会誌   Vol. 56   2019

     More details

  13. 暑熱条件下で抗原接種した鶏の液性免疫応答が遅延する原因解明

    平川良太, 野地智法, 喜久里基, 古川恭平, 村井篤嗣, 豊水正昭

    日本家禽学会誌   Vol. 55   2018

     More details

  14. 鶏における暑熱感作時の骨格筋タンパク質分解亢進の分子メカニズムの解明

    古川恭平, 喜久里基, 豊水正昭

    日本家禽学会誌   Vol. 55   2018

     More details

  15. 肉用鶏へのCNSLならびに加熱CNSL給与時におけるその動態と腸内細菌叢の解析

    永津健太郎, AZAD Md. Abul Kalam, 南都文香, 古川恭平, 平川良太, 喜久里基, 陶山佳久, 森田英利, 嶋田武志, 豊水正昭

    日本家禽学会誌   Vol. 55   2018

     More details

  16. 暑熱環境が肉用鶏のリンパ組織に及ぼす影響

    平川良太, 野地智法, 喜久里基, 古川恭平, 村井篤嗣, 豊水正昭

    日本畜産学会大会講演要旨   Vol. 124th   2018

     More details

  17. 熱ストレスを負荷したニワトリにおける解糖減少は免疫応答と関連している(Decreased Glycolysis Relates to Immune Response in Heat-Stressed Chicken)

    Nurjanah Siti, 野地 智法, 南都 文香, 古川 恭平, 阿部 汐里, 福田 栞, 喜久里 基, 豊水 正昭

    日本畜産学会大会講演要旨集   Vol. 122回   page: 127 - 127   2017.3

     More details

    Language:English   Publisher:(公社)日本畜産学会  

  18. 生理的濃度のコルチコステロンはニワトリ高温培養筋細胞のタンパク質分解を増強しない

    古川恭平, 喜久里基, 豊水正昭

    日本畜産学会大会講演要旨   Vol. 122nd   2017

     More details

  19. Roles of mitochondrial oxidative phosphorylation and reactive oxygen species generation in the metabolic modification of avian skeletal muscle

      Vol. 60 ( 2 ) page: 57 - 68   2016

     More details

  20. ニワトリ筋細胞におけるオレウロペインのPGC-1α発現誘導作用がミトコンドリア生合成・活性酸素産生におよぼす影響

    室井ひかる, 喜久里基, 上部雄一郎, 古川恭平, 豊水正昭

    日本畜産学会大会講演要旨   Vol. 120th   2015

     More details

  21. 高温処理時の鶏骨格筋細胞におけるミトコンドリア活性酸素種(ROS)がタンパク質分解に及ぼす影響

    古川恭平, 喜久里基, 神園巴美, 吉田隼巳, 豊水正昭

    日本畜産学会大会講演要旨   Vol. 119th   2015

     More details

  22. 慢性暑熱曝露時のタンパク質分解関連遺伝子発現亢進におけるミトコンドリア活性酸素種(ROS)の関与

    古川恭平, 喜久里基, 神園巴美, 豊水正昭

    日本家禽学会誌   Vol. 52   2015

     More details

  23. In vitro studies investigating a possible mechanism by which heat-induced reactive oxygen species (ROS) down-regulates the protein contents in skeletal muscle of broilers chickens

      Vol. 58 ( 2 ) page: 53 - 63   2014

     More details

  24. 電解還元水給与による慢性暑熱曝露鶏の酸化ストレス緩和機構の解明ならびに炎症応答抑制効果の検証

    松野良平, 喜久里基, 古川恭平, 大津晴彦, 高橋和昭, 豊水正昭

    日本家禽学会誌   Vol. 51   2014

     More details

▼display all

Research Project for Joint Research, Competitive Funding, etc. 1

  1. ニュートリジェネティクスから見る大豆製品の嗜好性に関する基盤研究

    2021.4 - 2022.3

      More details

    Authorship:Principal investigator 

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. ポリアミンの抗肥満効果の検証とその作用メカニズムの解明

    Grant number:21K14814  2021.4 - 2024.3

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    古川 恭平

      More details

    Authorship:Principal investigator 

    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    ポリアミンは穀類、大豆製品や肉類など多様な食材に含まれる化合物であり、近年様々な健康効果があることが知られ始めている。本研究の研究ターゲットとなる、肥満は特に先進国で問題となっており、様々な疾患に関与するため、健康寿命を縮小する原因の一つになっている。そこで、本研究は、抗肥満効果という観点からポリアミンの有用性を明らかにする。また、ポリアミンの作用メカニズムを抗生物質や網羅的解析により調べることで、栄養生理学の発展にも貢献することができると考えられる。
    ポリアミンは様々な食材に含まれる食品成分であるが、健康効果に関する報告は他の食品成分に比べると比較的少ない。本研究では、肥満は様々な疾患の発症ならびに老化反応の促進に関わることに着目し、ポリアミンの抗肥満効果について検証する。研究初年度における実験として、3種のポリアミン(プトレシン・スペルミジン・スペルミン)およびポリアミンの合成に用いられるプロリンが高脂肪食誘導性の肥満を改善するかを検討した。
    高脂肪食の摂取により体重や脂肪重量は有意に増加した。ポリアミンおよびプロリンの飲水投与により、体重はわずかに減少したが、有意な変化は認められず、脂肪重量においても効果は認められなかった。しかしながら、経口グルコース負荷試験においては、高脂肪食群におけるグルコース投与後の血糖値の増加をプトレシン、スペルミジンおよびプロリン添加は有意に抑制した。同様の傾向がインスリン負荷試験においても観察されるかを検討したが、ポリアミンおよびプロリンの効果は認められなかった。血中パラメータの解析では、血中インスリン濃度は、高脂肪食により有意に増加したが、この増加はスペルミジン投与により抑制された。また、肝臓中総コレステロール含量はプトレシン添加群において、高脂肪食群と比較して減少する傾向を示した。
    したがって、プトレシン、スペルミジンおよびプロリンは高脂肪食による血糖調節機能の障害を改善することが示された。また、スペルミジンはインスリン分泌機能を改善している可能性も示された他、プトレシンは肝臓脂質代謝を改善している可能性が示された。
    本年度の目的として、ポリアミンの抗肥満効果の検証とそれに腸内細菌叢が関与するかの検証であった。前者においては、抗肥満効果は確認されなかったものの、プトレシン、スペルミジンおよびプロリンにより経口グルコース負荷試験の改善が認められた。これは、高脂肪食による負の効果を改善することを意味しているため、目的の一部は達成できたと考えられる。また、後者の目的に関しては直接的な検討は行えなかったものの、プトレシンおよびスペルミジンの投与により同様の効果を得た。プトレシンの小腸における吸収率は他のポリアミンに比べると低いため、プトレシンが腸内細菌叢によりスペルミジンに変換された可能性や腸内細菌叢の構成を変化させた可能性など、腸内細菌叢の関与を示唆している。したがって、後者の目的に関しても一部達成されたと考える。
    次年度の研究としてまず行うのは、本研究の主目的である抗肥満効果の有無の再検討である。今年度の結果において、糖代謝に効果を持つ可能性が示されたため、高脂肪のみならず糖質も増やしたウエスタン食での実験を行うことを改善点の候補として考えている。また、インスリン分泌の関与も疑われたため、膵臓を用いた実験を行うことも計画している。
    上記の実験において、抗肥満効果が認められれば、腸内細菌叢の関与を検討するため、糞便移植や抗生物質投与を行い、抗肥満効果がキャンセルされるか否かを検討する。

  2. 胎児期のポリアミンによるエピゲノム変化の必須性

    Grant number:19J01450  2019.4 - 2022.3

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    古川 恭平

  3. 暑熱環境下における肉用鶏のタンパク質分解誘導メカニズムの解明とその制御

    Grant number:16J02953  2016.4 - 2019.3

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    古川 恭平

      More details

    本研究の目的は、暑熱負荷ニワトリにおける筋タンパク質分解の誘導メカニズムを解明し、これに基づき、同分解の飼料制御を行うことである。H29年度までの研究により、暑熱時のニワトリ骨格筋では、ユビキチン転移酵素Atrogin-1の発現増加にともなうユビキチンプロテアソーム系のタンパク質分解が亢進すること、ならびに、同酵素発現には「筋ミトコンドリア活性酸素の過剰産生」と「筋Akt/FoxO1の脱リン酸化」が関与することを明らかにしている。最終年度となるH30年度の研究では、①Akt/FoxO1脱リン酸化をもたらす因子を決定し、暑熱時の筋タンパク質分解亢進メカニズムの全体像を推定した上で、②アミノ酸による栄養制御を試みた。実験①において、Aktシグナルに影響を与えていることが考えられたインスリンの血中濃度を調べた結果、Atrogin-1発現の増加した暑熱0.5日後において血中インスリン濃度は低下した。したがって、暑熱時のAktシグナルの脱リン酸化はインスリンの分泌低下によってもたらされる可能性が示され、暑熱時の筋タンパク質分解の制御点は「活性酸素の過剰産生」と「インスリンシグナル伝達の不活性化」の2点であることが考えられた。つづいて、実験②では、それら双方の因子に効果を示すことが考えられたグルタミンおよびグルタミン酸を暑熱ニワトリに同時給与し、筋タンパク質分解の抑制効果を検証した。その結果、グルタミンおよびグルタミン酸の添加により、暑熱0.5日後の筋Atrogin-1発現および暑熱3日後の血中3-メチルヒスチジン濃度(筋タンパク質分解の指標)の増加は共に抑制され、暑熱時の筋タンパク質分解に対する両アミノ酸添加の抑制効果が実証された。このように、本研究が明らかにした暑熱時の筋タンパク質分解に関する知見は、暑熱時の家禽産肉量を改善する生産システムの基盤となることが期待される。