研究者詳細 - 豊國　伸哉

論文 - 豊國　伸哉

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Fenton reaction-induced renal carcinogenesis in Mutyh-deficient mice exhibits less chromosomal aberrations than the rat model. 査読有り Open Access

Li GH, Akatsuka S, Chew SH, Jiang L, Nishiyama T, Sakamoto A, Takahashi T, Futakuchi M, Suzuki H, Sakumi K, Nakabeppu Y, Toyokuni S.

Pathology International 67 巻 ( 11 ) 頁： 564-574 2017年11月

Role of catalytic iron and oxidative stress in nitrofen-induced congenital diaphragmatic hernia and its amelioration by Saireito (TJ-114). 査読有り国際誌 Open Access

Hirako S, Tsuda H, Ito F, Okazaki Y, Hirayama T, Nagasawa H, Nakano T, Imai K, Kotani T, Kikkawa F, Toyokuni S

Journal of clinical biochemistry and nutrition 61 巻 ( 3 ) 頁： 176 - 182 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人　日本酸化ストレス学会

Congenital diaphragmatic hernia (CDH) is a life-threatening neonatal disease that leads to lung hypoplasia and pulmonary hypertension. We recently found that maternal prenatal administration of Saireito (TJ-114) ameliorates fetal CDH in a nitrofen-induced rat model. Here, we studied the role of iron and oxidative stress in neonates of this model and in lung fibroblasts IMR90-SV in asso-ciation with nitrofen and Saireito. We observed increased immuno- staining of 8-hydroxy-2'-deoxyguanosine in the lungs of neonates with CDH, which was ameliorated by maternal Saireito intake. Pulmonary transferrin receptor expression was significantly decreased in both CDH and CDH after Saireito in comparison to normal controls, indicating functional lung immaturity, whereas catalytic Fe(ll) and pulmonaiy DMT1/ferroportin expression remained constant among the three groups. Saireito revealed a dose-dependent scavenging capacity with electron spin resonance spin trapping in vitro against hydroxyl radicals but not against superoxide. Finally, nitrofen revealed dose-dependent cytotoxicity to IMR90-SV cells, accompanied by an increase in oxidative stress, as seen by 5(6)-chloromethyl-2',7'-dichlorodihydrofluorescein diacetate and catalytic Fe(ll). Saireito ameliorated all of these in IMR90-SV cells. In conclusion, catalytic Fe(ll)-dependent oxidative stress by nitrofen may be the pathogenic cause of CDH, and the antioxidative activity of Saireito is at least partially responsible for improving nitrof en-induced CDH.

DOI： 10.3164/jcbn.17-17

Fenton reaction-induced renal carcinogenesis in Mutyh-deficient mice exhibits less chromosomal aberrations than the rat model. 国際誌 Open Access

Li GH, Akatsuka S, Chew SH, Jiang L, Nishiyama T, Sakamoto A, Takahashi T, Futakuchi M, Suzuki H, Sakumi K, Nakabeppu Y, Toyokuni S

Pathology international 67 巻 ( 11 ) 頁： 564 - 574 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Pathology International

Oxidative stress including iron excess has been associated with carcinogenesis. The level of 8-oxoguanine, a major oxidatively modified base in DNA, is maintained very low by three distinct enzymes, encoded by OGG1, MUTYH and MTH1. Germline biallelic inactivation of MUTYH represents a familial cancer syndrome called MUTYH-associated polyposis. Here, we used Mutyh-deficient mice to evaluate renal carcinogenesis induced by ferric nitrilotriacetate (Fe-NTA). Although the C57BL/6 background is cancer-resistant, a repeated intraperitoneal administration of Fe-NTA induced a high incidence of renal cell carcinoma (RCC; 26.7%) in Mutyh-deficient mice in comparison to wild-type mice (7.1%). Fe-NTA treatment also induced renal malignant lymphoma, which did not occur without the Fe-NTA treatment in both the genotypes. Renal tumor-free survival after Fe-NTA treatment was marginally different (P = 0.157) between the two genotypes. Array-based comparative genome hybridization analyses revealed, in RCC, the loss of heterozygosity in chromosomes 4 and 12 without p16INKA inactivation; these results were confirmed by a methylation analysis and showed no significant difference between the genotypes. Lymphomas showed a preference for genomic amplifications. Dlk1 inactivation by promoter methylation may be involved in carcinogenesis in both tumors. Fe-NTA-induced murine RCCs revealed significantly less genomic aberrations than those in rats, demonstrating a marked species difference.

DOI： 10.1111/pin.12598

Ferroptosis: A Regulated Cell Death Nexus Linking Metabolism, Redox Biology, and Disease. 国際誌

Stockwell BR, Friedmann Angeli JP, Bayir H, Bush AI, Conrad M, Dixon SJ, Fulda S, Gascón S, Hatzios SK, Kagan VE, Noel K, Jiang X, Linkermann A, Murphy ME, Overholtzer M, Oyagi A, Pagnussat GC, Park J, Ran Q, Rosenfeld CS, Salnikow K, Tang D, Torti FM, Torti SV, Toyokuni S, Woerpel KA, Zhang DD

Cell 171 巻 ( 2 ) 頁： 273 - 285 2017年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Cell

Ferroptosis is a form of regulated cell death characterized by the iron-dependent accumulation of lipid hydroperoxides to lethal levels. Emerging evidence suggests that ferroptosis represents an ancient vulnerability caused by the incorporation of polyunsaturated fatty acids into cellular membranes, and cells have developed complex systems that exploit and defend against this vulnerability in different contexts. The sensitivity to ferroptosis is tightly linked to numerous biological processes, including amino acid, iron, and polyunsaturated fatty acid metabolism, and the biosynthesis of glutathione, phospholipids, NADPH, and coenzyme Q10. Ferroptosis has been implicated in the pathological cell death associated with degenerative diseases (i.e., Alzheimer's, Huntington's, and Parkinson's diseases), carcinogenesis, stroke, intracerebral hemorrhage, traumatic brain injury, ischemia-reperfusion injury, and kidney degeneration in mammals and is also implicated in heat stress in plants. Ferroptosis may also have a tumor-suppressor function that could be harnessed for cancer therapy. This Primer reviews the mechanisms underlying ferroptosis, highlights connections to other areas of biology and medicine, and recommends tools and guidelines for studying this emerging form of regulated cell death. Ferroptosis is a form of regulated cell death characterized by the iron-dependent accumulation of lipid hydroperoxides to lethal levels. Emerging evidence suggests that ferroptosis represents an ancient vulnerability caused by the incorporation of polyunsaturated fatty acids into cellular membranes, and cells have developed complex systems that exploit and defend against this vulnerability in different contexts. The sensitivity to ferroptosis is tightly linked to numerous biological processes, including amino acid, iron, and polyunsaturated fatty acid metabolism, and the biosynthesis of glutathione, phospholipids, NADPH, and coenzyme Q10. Ferroptosis has been implicated in the pathological cell death associated with degenerative diseases (i.e., Alzheimer's, Huntington's, and Parkinson's diseases), carcinogenesis, stroke, intracerebral hemorrhage, traumatic brain injury, ischemia-reperfusion injury, and kidney degeneration in mammals and is also implicated in heat stress in plants. Ferroptosis may also have a tumor-suppressor function that could be harnessed for cancer therapy. This Primer reviews the mechanisms underlying ferroptosis, highlights connections to other areas of biology and medicine, and recommends tools and guidelines for studying this emerging form of regulated cell death.

DOI： 10.1016/j.cell.2017.09.021

Osteogenic differentiation in dedifferentiated liposarcoma: a study of 36 cases in comparison to the cases without ossification. 査読有り

Yamashita K, Kohashi K, Yamada Y, Ishii T, Nishida Y, Urakawa H, Ito I, Takahashi M, Inoue T, Ito M, Ohara Y, Oda Y, Toyokuni S.

Histopathology 2017年10月

Osteogenic differentiation in dedifferentiated liposarcoma: a study of 36 cases in comparison to the cases without ossification. 査読有り国際誌

Yamashita K, Kohashi K, Yamada Y, Ishii T, Nishida Y, Urakawa H, Ito I, Takahashi M, Inoue T, Ito M, Ohara Y, Oda Y, Toyokuni S

Histopathology 2017年10月

The iron chaperone poly(rC)-binding protein 2 forms a metabolon with the heme oxygenase 1/cytochrome P450 reductase complex for heme catabolism and iron transfer. 査読有り

Yanatori I, Richardson DR, Toyokuni S, Kishi F.

Journal of Biological Chemistry 292 巻 ( 32 ) 頁： 13205-13229 2017年8月

The iron chaperone poly(rC)-binding protein 2 forms a metabolon with the heme oxygenase 1/cytochrome P450 reductase complex for heme catabolism and iron transfer. 国際誌

Yanatori I, Richardson DR, Toyokuni S, Kishi F

The Journal of biological chemistry 292 巻 ( 32 ) 頁： 13205 - 13229 2017年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Biological Chemistry

Mammals incorporate a major proportion of absorbed iron as heme, which is catabolized by the heme oxygenase 1 (HO1)–NADPH-cytochrome P450 reductase (CPR) complex into biliverdin, carbon monoxide, and ferrous iron. Moreover, intestinal iron is incorporated as ferrous iron, which is transported via the iron importer, divalent metal transporter 1 (DMT1). Recently, we demonstrated that the iron chaperone poly(rC)-binding protein 2 (PCBP2) can directly receive ferrous iron from DMT1 or transfer iron to the iron exporter, ferroportin 1. To promote intracellular iron flux, an iron chaperone may be essential for receiving iron generated by heme catabolism, but this hypothesis is untested so far. Herein, we demonstrate that HO1 binds to PCBP2, but not to other PCBP family members, namely PCBP1, PCBP3, or PCBP4. Interestingly, HO1 formed a complex with either CPR or PCBP2, and it was demonstrated that PCBP2 competes with CPR for HO1 binding. Using PCBP2-deletion mutants, we demonstrated that the PCBP2 K homology 3 domain is important for the HO1/PCBP2 interaction. In heme-loaded cells, heme prompted HO1–CPR complex formation and decreased the HO1/PCBP2 interaction. Furthermore, in vitro reconstitution experiments with purified recombinant proteins indicated that HO1 could bind to PCBP2 in the presence of heme, whereas loading of PCBP2 with ferrous iron caused PCBP2 to lose its affinity for HO1. These results indicate that ferrous iron released from heme can be bound by PCBP2 and suggest a model for an integrated heme catabolism and iron transport metabolon.

DOI： 10.1074/jbc.M117.776021

The iron chaperone poly(rC)-binding protein 2 forms a metabolon with the heme oxygenase 1/cytochrome P450 reductase complex for heme catabolism and iron transfer. 査読有り国際誌

Yanatori I, Richardson DR, Toyokuni S, Kishi F

Journal of Biological Chemistry 292 巻 ( 32 ) 頁： 13205-13229 2017年8月

IRON OVERLOAD ENHANCED CELL DEATH INDUCED BY CARCINOGENIC FIBROUS MATERIALS

Ito Fumiya, Shi Lei, Toyokuni Shinya

AMERICAN JOURNAL OF HEMATOLOGY 92 巻 ( 8 ) 頁： E365 - E365 2017年8月

IRON OVERLOAD ENHANCED CELL DEATH INDUCED BY CARCINOGENIC FIBROUS MATERIALS 国際誌

Fumiya Ito, Lei Shi, Shinya Toyokuni

AMERICAN JOURNAL OF HEMATOLOGY 92 巻 ( 8 ) 頁： E365 - E365 2017年8月

Novel Intraperitoneal Treatment With Non-Thermal Plasma-Activated Medium Inhibits Metastatic Potential of Ovarian Cancer Cells. 査読有り Open Access

Nakamura K, Peng Y, Utsumi F, Tanaka H, Mizuno M, Toyokuni S, Hori M, Kikkawa F, Kajiyama H.Sci

Scientific Reports 7 巻 ( 1 ) 頁： 6085 2017年7月

Novel Intraperitoneal Treatment With Non-Thermal Plasma-Activated Medium Inhibits Metastatic Potential of Ovarian Cancer Cells. 国際誌 Open Access

Nakamura K, Peng Y, Utsumi F, Tanaka H, Mizuno M, Toyokuni S, Hori M, Kikkawa F, Kajiyama H

Scientific reports 7 巻 ( 1 ) 頁： 6085 - 6085 2017年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Reports

Non-thermal atmospheric pressure plasma has been proposed as a new therapeutic tool for cancer treatment. Recently, plasma-activated medium (PAM) has been widely studied in various cancer types. However, there are only few reports demonstrating the anti-tumour effects of PAM in an animal model reflecting pathological conditions and the accompanying mechanism. Here we investigated the inhibitory effect of PAM on the metastasis of ovarian cancer ES2 cells in vitro and in vivo. We demonstrated that ES2 cell migration, invasion and adhesion were suppressed by PAM at a certain PAM dilution ratio, whereas cell viability remained unaffected. In an in vivo mouse model of intraperitoneal metastasis, PAM inhibited peritoneal dissemination of ES2 cells, resulting in prolonged survival. Moreover, we assessed the molecular mechanism and found that MMP-9 was decreased by PAM. On further investigation, we also found that PAM prevented the activation of the MAPK pathway by inhibiting the phosphorylation of JNK1/2 and p38 MAPK. These findings indicate that PAM inhibits the metastasis of ovarian cancer cells through reduction of MMP-9 secretion, which is critical for cancer cell motility. Our findings suggest that PAM intraperitoneal therapy may be a promising treatment option for ovarian cancer.

DOI： 10.1038/s41598-017-05620-6

Astaxanthin ameliorates ferric nitrilotriacetate-induced renal oxidative injury in rats. 査読有り Open Access

Okazaki Y, Okada S, Toyokuni S.

Journal of Clinical Biochemistry and Nutrition 61 巻 ( 1 ) 頁： 18-24 2017年7月

Non-thermal plasma induces a stress response in mesothelioma cells resulting in increased endocytosis, lysosome biogenesis and autophagy. 査読有り Open Access

Shi L, Ito F, Wang Y, Okazaki Y, Tanaka H, Mizuno M, Hori M, Hirayama T, Nagasawa H, Richardson DR, Toyokuni S.

Free Radical Biology & Medicine 108 巻頁： 904-917 2017年7月

Astaxanthin ameliorates ferric nitrilotriacetate-induced renal oxidative injury in rats. Open Access

Okazaki Y, Okada S, Toyokuni S

Journal of clinical biochemistry and nutrition 61 巻 ( 1 ) 頁： 18 - 24 2017年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人　日本酸化ストレス学会

Daily intake of vegetables can reduce the risk of cancer and lifestyle-related diseases. However, supplementary intake of p-carotene alone has been reported to increase the risk of lung cancer in male cigarette smokers and people who were exposed to asbestos. The mechanism of the antioxidative properties of carotenoids in vivo, especially under oxidative stress conditions, still remains unclear. To investigate the antioxidant properties of dietary compounds, we examined the effects of chemically modified astaxanthin (Ax-C-8) using a rat model of ferric nitrilotriacetate (Fe-NTA)-induced renal oxidative injury. Ax-C-8 demonstrated lethally toxic effects on the rats in a dose-dependent manner. Following supplementation with Ax-C-8 (0.02%, w/w) for 30 days, the rats were euthanized 1, 4 and 24 h after injection of Fe-NTA. After 4 h, Ax-C-8 pretreatment suppressed the elevation of creatinine and blood urea nitrogen and protected the rats from renal tubular necrosis and the formation of 4-hydroxy-2-nonenal-modified proteins. After 24 h, pretreatment with Ax-C-8 maintained the renal antioxidant enzyme levels and renal tubules. Here, we demonstrate the antioxidant effects of Ax-C-8 against Fe-NTA-induced oxidative injury in rats receiving a regular diet. These data suggest that dietary intake of astaxanthin may be useful for the prevention of renal tubular oxidative damage.

DOI： 10.3164/jcbn.16-114

Iron and thiol redox signaling in cancer: An exquisite balance to escape ferroptosis. 査読有り国際誌 Open Access

Toyokuni S, Ito F, Yamashita K, Okazaki Y, Akatsuka S

Free radical biology & medicine 108 巻頁： 610 - 626 2017年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Free Radical Biology and Medicine

Epidemiological data indicate a constant worldwide increase in cancer mortality, although the age of onset is increasing. Recent accumulation of genomic data on human cancer via next-generation sequencing confirmed that cancer is a disease of genome alteration. In many cancers, the Nrf2 transcription system is activated via mutations either in Nrf2 or Keap1 ubiquitin ligase, leading to persistent activation of the genes with antioxidative functions. Furthermore, deep sequencing of passenger mutations is clarifying responsible cancer causative agent(s) in each case, including aging, APOBEC activation, smoking and UV. Therefore, it is most likely that oxidative stress is the principal initiating factor in carcinogenesis, with the involvement of two essential molecules for life, iron and oxygen. There is evidence based on epidemiological and animal studies that excess iron is a major risk for carcinogenesis, suggesting the importance of ferroptosis-resistance. Microscopic visualization of catalytic Fe(II) has recently become available. Although catalytic Fe(II) is largely present in lysosomes, proliferating cells harbor catalytic Fe(II) also in the cytosol and mitochondria. Oxidative stress catalyzed by Fe(II) is counteracted by thiol systems at different functional levels. Nitric oxide, carbon monoxide and hydrogen (per)sulfide modulate these reactions. Mitochondria generate not only energy but also heme/iron sulfur cluster cofactors and remain mostly dysfunctional in cancer cells, leading to Warburg effects. Cancer cells are under persistent oxidative stress with a delicate balance between catalytic iron and thiols, thereby escaping ferroptosis. Thus, high-dose L-ascorbate and non-thermal plasma as well as glucose/glutamine deprivation may provide additional benefits as cancer therapies over preexisting therapeutics.

DOI： 10.1016/j.freeradbiomed.2017.04.024

Non-thermal plasma induces a stress response in mesothelioma cells resulting in increased endocytosis, lysosome biogenesis and autophagy. 国際誌 Open Access

Shi L, Ito F, Wang Y, Okazaki Y, Tanaka H, Mizuno M, Hori M, Hirayama T, Nagasawa H, Richardson DR, Toyokuni S

Free radical biology & medicine 108 巻頁： 904 - 917 2017年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Free Radical Biology and Medicine

Non-thermal plasma (NTP) is a potential new therapeutic modality for cancer. However, its mechanism of action remains unclear. Herein, we studied the effect of NTP on mesothelioma cells and fibroblasts to understand its anti-proliferative efficacy. Interestingly, NTP demonstrated greater selective anti-proliferative activity against mesothelioma cells relative to fibroblasts than cisplatin, which is used for mesothelioma treatment. The anti-proliferative effect of NTP was enhanced by pre-incubation with the cellular iron donor, ferric ammonium citrate (FAC), and inhibited by iron chelation using desferrioxamine (DFO). Three oxidative stress probes (CM-H2DCFDA, MitoSOX and C11-BODIPY) demonstrated reactive oxygen species (ROS) generation by NTP, which was inhibited by DFO. Moreover, NTP decreased transferrin receptor-1 and increased ferritin-H and -L chain expression that was correlated with decreased iron-regulatory protein expression and RNA-binding activity. This regulation was potentially due to increased intracellular iron in lysosomes, which was demonstrated via the Fe(II)-selective probe, HMRhoNox-M, and was consistent with autophagic-induction. Immunofluorescence using LysoTracker and Pepstatin A probes demonstrated increased cellular lysosome content, which was confirmed by elevated LAMP1 expression. The enhanced lysosomal biogenesis after NTP could be due to the observed increase in fluid-phase endocytosis and early endosome formation. These results suggest NTP acts as a stressor, which results in increased endocytosis, lysosome content and autophagy. In fact, NTP rapidly increased autophagosome formation, as judged by increased LC3B-II expression, which co-localized with LAMP1, indicating autophagolysosome formation. Autophagic-induction by NTP was confirmed using electron microscopy. In summary, NTP acts as a cellular stressor to rapidly induce fluid-phase endocytosis, lysosome biogenesis and autophagy.

DOI： 10.1016/j.freeradbiomed.2017.04.368

Astaxanthin ameliorates ferric nitrilotriacetate-induced renal oxidative injury in rats. 査読有り国際誌 Open Access

Okazaki Y, Okada S, Toyokuni S

Journal of Clinical Biochemistry and Nutrition 61 巻 ( 1 ) 頁： 18-24 2017年7月

Stapled BIG3 helical peptide ERAP potentiates anti-tumour activity for breast cancer therapeutics. 査読有り

Yoshimaru T, Aihara K, Komatsu M, Matsushita Y, Okazaki Y, Toyokuni S, Honda J, Sasa M, Miyoshi Y, Otaka A, Katagiri T.

Scientific Reports 7 巻 ( 1 ) 頁： 1821 2017年5月

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論文 - 豊國　伸哉