Faculty Profiles - TOYOKUNI Shinya

Papers - TOYOKUNI Shinya

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Cold plasma irradiation of chitosan: A straight pathway to selective antitumor therapy. Reviewed International journal Open Access

Camelia Miron, Bianca Andreica, Manuela M Iftime, Adrian Fifere, Taishi Yamakawa, Shinya Toyokuni, Masaaki Mizuno, Liliana M Tartau, Andrei Bejan, Yashiro Motooka, Takashi Kondo, Ion Sava, Valeria Harabagiu, Jun Kumagai, Ayako Tanaka, Hiromasa Tanaka, Luminita Marin, Masaru Hori

International journal of biological macromolecules Vol. 281 ( Pt 4 ) page： 136513 - 136513 2024.11

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

Plasma-activated chitosan (PAC) colloids for cancer treatment were obtained by using the cold atmospheric plasma technique. Chitosan solutions were irradiated by plasma ignited in argon gas and in a mixture of argon with nitrogen and oxygen gases in certain ratios. The structural modifications of chitosan and the chemical species generated in plasma were investigated by EPR, LC-MS/MS, XRD, DLS, and TGA methods. The cell viability test showed a selective cytotoxic effect on human breast carcinoma cells (MCF-7), while the human mammary epithelial cells (MCF-10A) were left unharmed. The cytotoxic effect was attributed mainly to chitooligosaccharides, but also to a synergistic effect with other compounds generated in very low concentrations in plasma, such as glyceric acid, ethyl acetate, or tricarballylic acid. The plasma irradiation improved the antioxidant activity and mucoadhesivity, while not affecting the hemocompatibility investigated by a standard hemolysis ex vivo test on mice blood. Moreover, the in vivo biocompatibility investigation at intraperitoneal administration of PAC in mice showed no statistically significant changes in the hematologic, biochemical, and immune system parameters, and no morphologic alterations of the liver and kidney. All these data indicate the cold plasma activation of chitosan as a straight method to produce biocompatible, antitumor systems.

DOI： 10.1016/j.ijbiomac.2024.136513

Effects of autophagy on the selective death of human breast cancer cells exposed to plasma-activated Ringer’s lactate solution Reviewed International journal

Taishi Yamakawa, Ayako Tanaka, Camelia Miron, Kae Nakamura, Hiroaki Kajiyama, Shinya Toyokuni, Masaaki Mizuno, Masaru Hori, Hiromasa Tanaka

Free Radical Research Vol. 58 ( 11 ) page： 758 - 769 2024.11

増大特集学術研究支援の最先端 Ⅱ.先端モデル動物支援プラットフォーム(AdAMS) ⅱ.病理形態解析支援てんかん,神経変性症および慢性腎臓病モデル動物としてのTxn1遺伝子変異ラットの樹立 Reviewed International journal

大守(川﨑) 伊織, 大内田守, 真下知士, 豊國伸哉

生体の科学 Vol. 75 ( 5 ) page： 454 - 455 2024.10

増大特集学術研究支援の最先端 Ⅱ.先端モデル動物支援プラットフォーム(AdAMS) ⅱ.病理形態解析支援経験豊富な病理専門医が研究の方向性を指南する(総論) Reviewed International journal

豊國伸哉

生体の科学 Vol. 75 ( 5 ) page： 438 - 439 2024.10

Ferroptosis is a targetable detrimental factor in metabolic dysfunction-associated steatotic liver disease. International journal Open Access

Peleman C, Hellemans S, Veeckmans G, Arras W, Zheng H, Koeken I, Van San E, Hassannia B, Walravens M, Kayirangwa E, Beyene NT, Van Herck MA, De Vos WH, Pintelon I, van Nassauw L, Oosterlinck B, Smet A, Vits L, Dirinck E, Verrijken A, De Man J, Van Eyck A, Kwanten WJ, Vonghia L, Driessen A, Augustyns K, Toyokuni S, De Winter B, Van Steenkiste C, Francque S, Vanden Berghe T

Cell death and differentiation Vol. 31 ( 9 ) page： 1113 - 1126 2024.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Cell Death and Differentiation

There is an unmet clinical need for pharmacologic treatment for metabolic dysfunction-associated steatotic liver disease (MASLD). Hepatocyte cell death is a hallmark of this highly prevalent chronic liver disease, but the dominant type of cell death remains uncertain. Here we report that ferroptosis, an iron-catalyzed mode of regulated cell death, contributes to MASLD. Unsupervised clustering in a cohort of biopsy-proven MASLD patients revealed a subgroup with hepatic ferroptosis signature and lower glutathione peroxidase 4 (GPX4) levels. Likewise, a subgroup with reduced ferroptosis defenses was discerned in public transcriptomics datasets. Four weeks of choline-deficient L-amino acid-defined high-fat diet (CDAHFD) induced MASLD with ferroptosis in mice. Gpx4 overexpression did not affect steatohepatitis, instead CDAHFD protected from morbidity due to hepatocyte-specific Gpx4 knockout. The ferroptosis inhibitor UAMC-3203 attenuated steatosis and alanine aminotransferase in CDAHFD and a second model, i.e., the high-fat high-fructose diet (HFHFD). The effect of monounsaturated and saturated fatty acids supplementation on ferroptosis susceptibility was assessed in human HepG2 cells. Fat-laden HepG2 showed a drop in ferroptosis defenses, increased phosphatidylglycerol with two polyunsaturated fatty acid (PUFA) lipid tails, and sustained ferroptosis sensitivity. In conclusion, this study identified hepatic ferroptosis as a detrimental factor in MASLD patients. Unexpectedly, non-PUFA supplementation to hepatocytes altered lipid bilayer composition to maintain ferroptosis sensitivity. Based on findings in in vivo models, ferroptosis inhibition represents a promising therapeutic target in MASLD. (Figure presented.)

DOI： 10.1038/s41418-024-01348-9

Ferroptosis induced by plasma-activated Ringer's lactate solution prevents oral cancer progression. International journal Open Access

Sato K, Yang M, Nakamura K, Tanaka H, Hori M, Nishio M, Suzuki A, Hibi H, Toyokuni S

Oral diseases Vol. 30 ( 6 ) page： 3912 - 3924 2024.9

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

Objective: This study aimed to investigate the effect of plasma-activated Ringer's lactate solution (PAL) on oral squamous cell carcinoma (OSCC) cells and carcinogenic processes with a particular focus on iron and collagenous matrix formation. Materials and Methods: We used three OSCC cell lines, one keratinocyte cell line, and two fibroblast lines, and cell viability assays, immunoblotting, flow cytometry, and transmission electron microscopy were performed to evaluate the effect and type of cell death. The effect of PAL treatment on lysyl oxidase (LOX) expression was investigated in vitro and in vivo. Tamoxifen-inducible Mob1a/b double-knockout mice were used for the in vivo experiment. Results: PAL killed OSCC cells more effectively than the control nontumorous cells and suppressed cell migration and invasion. Ferroptosis occurred and the protein level of LOX was downregulated in cancer cells in vitro and in vivo. Additionally, PAL improved the survival rate of mice and suppressed collagenous matrix formation. Conclusions: We demonstrated that PAL specifically kills OSCC cells and that ferroptosis occurs in vitro and in vivo. Furthermore, PAL can prevent carcinogenesis and improve the survival rate of oral cancer, especially tongue cancer, by changing collagenous matrix formation via LOX suppression.

DOI： 10.1111/odi.14827

A guideline on the molecular ecosystem regulating ferroptosis. International journal Open Access

Dai E, Chen X, Linkermann A, Jiang X, Kang R, Kagan VE, Bayir H, Yang WS, Garcia-Saez AJ, Ioannou MS, Janowitz T, Ran Q, Gu W, Gan B, Krysko DV, Zhu X, Wang J, Krautwald S, Toyokuni S, Xie Y, Greten FR, Yi Q, Schick J, Liu J, Gabrilovich DI, Liu J, Zeh HJ, Zhang DD, Yang M, Iovanna J, Kopf M, Adolph TE, Chi JT, Li C, Ichijo H, Karin M, Sankaran VG, Zou W, Galluzzi L, Bush AI, Li B, Melino G, Baehrecke EH, Lotze MT, Klionsky DJ, Stockwell BR, Kroemer G, Tang D

Nature cell biology Vol. 26 ( 9 ) page： 1447 - 1457 2024.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Cell Biology

Ferroptosis, an intricately regulated form of cell death characterized by uncontrolled lipid peroxidation, has garnered substantial interest since this term was first coined in 2012. Recent years have witnessed remarkable progress in elucidating the detailed molecular mechanisms that govern ferroptosis induction and defence, with particular emphasis on the roles of heterogeneity and plasticity. In this Review, we discuss the molecular ecosystem of ferroptosis, with implications that may inform and enable safe and effective therapeutic strategies across a broad spectrum of diseases.

DOI： 10.1038/s41556-024-01360-8

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BRCA2変異は酸化ストレス発がん環境下でAKTを介したフェロトーシス抵抗性を誘導し細胞周期を促進する(BRCA2 mutant induce ferroptosis resistance via AKT and promote cell cycle under Fenton reaction-based carcinogenesis) Reviewed International journal

前田勇貴, 真下知士, 豊國伸哉, 豊國伸哉

日本癌学会総会記事 Vol. 83回 page： P - 2013 2024.9

Special issue: Extracellular fine particles in life, death and disease. International journal

Toyokuni S

Archives of biochemistry and biophysics Vol. 757 page： 110027 2024.7

Heat-treated and/or lysozyme-treated Enterococcus faecalis (FK-23) improves the progression of renal disease in a unilateral ischemia-reperfusion injury rat model International journal Open Access

Takemura Shigekazu, Minamiyama Yukiko, Ito Norihiko, Yamamoto Atsushi, Ichikawa Hiroshi, Nakagawa Kanako, Toyokuni Shinya, Osada-Oka Mayuko, Yoshikawa Toshikazu

Journal of Clinical Biochemistry and Nutrition Vol. 75 ( 1 ) page： 78 - 89 2024.7

Language：English Publishing type：Research paper (scientific journal) Publisher：SOCIETY FOR FREE RADICAL RESEARCH JAPAN

The prevalence of chronic kidney disease (CKD) is increasing owing to the elderly population. Here, we investigated the effects of heat-treated Enterococcus faecalis (FK-23) and lysozyme-treated FK-23 (LFK) on the progression of CKD in rats. A CKD model was established using male Wistar rats by subjecting them to right nephrectomy (1K), followed by ischemia and reperfusion (IR). FK-23 or LFK was fed ad libitum as a mixed diet after right nephrectomy. Animals subjected to renal ischemia-reperfusion injury (IRI) showed increased plasma creatinine and blood urea nitrogen levels. Furthermore, in the kidneys, collagen accumulation and α-smooth muscle actin, indicative of fibroblast activation and fibrosis-related gene and protein expression, increased 3 weeks after IRI. FK-23 and LFK suppressed the increase in the mRNA levels of some of these genes. The increase in oxidative stress markers, 4-hydroxy-2-nonenal, endothelial nitric oxide synthase, and nitrotyrosine in the kidney, as well as increased plasma uremic toxins after IRI, were also ameliorated by FK-23 and LFK. Metagenomic analysis of fecal samples revealed that gut microbial alteration caused by IRI was also ameliorated by LFK treatment. These results suggest that Enterococcus faecalis ingredients may improve CKD progression by suppressing oxidative stress and correcting the balance of the intestinal microflora.

DOI： 10.3164/jcbn.24-29

International consensus guidelines for the definition, detection, and interpretation of autophagy-dependent ferroptosis. International journal Open Access

Chen X, Tsvetkov AS, Shen HM, Isidoro C, Ktistakis NT, Linkermann A, Koopman WJH, Simon HU, Galluzzi L, Luo S, Xu D, Gu W, Peulen O, Cai Q, Rubinsztein DC, Chi JT, Zhang DD, Li C, Toyokuni S, Liu J, Roh JL, Dai E, Juhasz G, Liu W, Zhang J, Yang M, Liu J, Zhu LQ, Zou W, Piacentini M, Ding WX, Yue Z, Xie Y, Petersen M, Gewirtz DA, Mandell MA, Chu CT, Sinha D, Eftekharpour E, Zhivotovsky B, Besteiro S, Gabrilovich DI, Kim DH, Kagan VE, Bayir H, Chen GC, Ayton S, Lünemann JD, Komatsu M, Krautwald S, Loos B, Baehrecke EH, Wang J, Lane JD, Sadoshima J, Yang WS, Gao M, Münz C, Thumm M, Kampmann M, Yu D, Lipinski MM, Jones JW, Jiang X, Zeh HJ, Kang R, Klionsky DJ, Kroemer G, Tang D

Autophagy Vol. 20 ( 6 ) page： 1213 - 1246 2024.6

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

Macroautophagy/autophagy is a complex degradation process with a dual role in cell death that is influenced by the cell types that are involved and the stressors they are exposed to. Ferroptosis is an iron-dependent oxidative form of cell death characterized by unrestricted lipid peroxidation in the context of heterogeneous and plastic mechanisms. Recent studies have shed light on the involvement of specific types of autophagy (e.g. ferritinophagy, lipophagy, and clockophagy) in initiating or executing ferroptotic cell death through the selective degradation of anti-injury proteins or organelles. Conversely, other forms of selective autophagy (e.g. reticulophagy and lysophagy) enhance the cellular defense against ferroptotic damage. Dysregulated autophagy-dependent ferroptosis has implications for a diverse range of pathological conditions. This review aims to present an updated definition of autophagy-dependent ferroptosis, discuss influential substrates and receptors, outline experimental methods, and propose guidelines for interpreting the results. Abbreviation: 3-MA:3-methyladenine; 4HNE: 4-hydroxynonenal; ACD: accidentalcell death; ADF: autophagy-dependentferroptosis; ARE: antioxidant response element; BH2:dihydrobiopterin; BH4: tetrahydrobiopterin; BMDMs: bonemarrow-derived macrophages; CMA: chaperone-mediated autophagy; CQ:chloroquine; DAMPs: danger/damage-associated molecular patterns; EMT,epithelial-mesenchymal transition; EPR: electronparamagnetic resonance; ER, endoplasmic reticulum; FRET: Försterresonance energy transfer; GFP: green fluorescent protein;GSH: glutathione;IF: immunofluorescence; IHC: immunohistochemistry; IOP, intraocularpressure; IRI: ischemia-reperfusion injury; LAA: linoleamide alkyne;MDA: malondialdehyde; PGSK: Phen Green™ SK;RCD: regulatedcell death; PUFAs: polyunsaturated fatty acids; RFP: red fluorescentprotein;ROS: reactive oxygen species; TBA: thiobarbituricacid; TBARS: thiobarbituric acid reactive substances; TEM:transmission electron microscopy.

DOI： 10.1080/15548627.2024.2319901

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Fatal COVID-19 pulmonary disease involves ferroptosis. International journal Open Access

Qiu B, Zandkarimi F, Saqi A, Castagna C, Tan H, Sekulic M, Miorin L, Hibshoosh H, Toyokuni S, Uchida K, Stockwell BR

Nature communications Vol. 15 ( 1 ) page： 3816 2024.5

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

Ferroptosis is a form of cell death that has been associated with different diseases. Here the authors describe an association of ferroptosis with COVID-19 pulmonary pathologies in both patient samples and hamster model and suggest that the dysregulation in iron and lipid metabolism could provide targets to reduce pathology.

DOI： 10.1038/s41467-024-48055-0

特集活性酸素と酸化ストレスがんとフェロトーシス International journal

豊國伸哉

医学のあゆみ Vol. 289 ( 4 ) page： 263 - 266 2024.4

Protocol for the isolation of GFP-expressing ferroptosis-dependent extracellular vesicles in in vitro cell culture models. Reviewed International journal Open Access

Fumiya Ito, Izumi Yanatori, Katsuhiro Kato, Shinya Toyokuni

STAR protocols Vol. 5 ( 1 ) page： 102892 - 102892 2024.3

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

Extracellular vesicles (EVs) are complex structures that transport various DNA, RNA, and protein. Recently, new EV secretion mechanisms have been identified through the iron regulatory system in mammalian cells. We revealed that ferroptosis increases EV secretion, which is named ferroptosis-dependent EVs (FedEVs). Here, we describe a step-by-step procedure to isolate GFP-expressing FedEVs for in vitro analysis. The FedEVs are further analyzed by imaging and flow cytometry analysis. For complete details on the use and execution of this protocol, please refer to Ito et al.1.

DOI： 10.1016/j.xpro.2024.102892

Elaborate cooperation of poly(rC)-binding proteins 1/2 and glutathione in ferroptosis induced by plasma-activated Ringer's lactate. International journal Open Access

Jiang L, Zheng H, Ishida M, Lyu Q, Akatsuka S, Motooka Y, Sato K, Sekido Y, Nakamura K, Tanaka H, Ishikawa K, Kajiyama H, Mizuno M, Hori M, Toyokuni S

Free radical biology & medicine Vol. 214 page： 28 - 41 2024.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Free Radical Biology and Medicine

Reactive species are involved in various aspects of neoplastic diseases, including carcinogenesis, cancer-specific metabolism and therapeutics. Non-thermal plasma (NTP) can directly provide reactive species, by integrating atmospheric and interjacent molecules as substrates, to represent a handy strategy to load oxidative stress in situ. NTP causes apoptosis and/or ferroptosis specifically in cancer cells of various types. Plasma-activated Ringer's lactate (PAL) is another modality at the preclinical stage as cancer therapeutics, based on more stable reactive species. PAL specifically kills malignant mesothelioma (MM) cells, employing lysosomal ·NO as a switch from autophagy to ferroptosis. However, the entire molecular mechanisms have not been elucidated yet. Here we studied cytosolic iron regulations in MM and other cancer cells in response to PAL exposure. We discovered that cells with higher catalytic Fe(II) are more susceptible to PAL-induced ferroptosis. PAL caused a cytosolic catalytic Fe(II)-associated pathology through iron chaperones, poly (rC)-binding proteins (PCBP)1/2, inducing a disturbance in glutathione-regulated iron homeostasis. PCBP1/NCOA4-mediated ferritinophagy started at a later phase, further increasing cytosolic catalytic Fe(II), ending in ferroptosis. In contrast, PCBP2 after PAL exposure contributed to iron loading to mitochondria, leading to mitochondrial dysfunction. Therapeutic effect of PAL was successfully applied to an orthotopic MM xenograft model in mice. In conclusion, PAL can selectively sensitize MM cells to ferroptosis by remodeling cytoplasmic iron homeostasis, where glutathione and PCBPs play distinct roles, resulting in lethal ferritinophagy and mitochondrial dysfunction. Our findings indicate the clinical application of PAL as a ferroptosis-inducer and the potential of PCBPs as novel targets in cancer therapeutics.

DOI： 10.1016/j.freeradbiomed.2024.02.001

BRCA2 mutation promotes ferroptosis resistance via suppression of p53 Reviewed International journal

Yuki Maeda, Tomoji Mashimo, Shinya Toyokuni

CANCER SCIENCE Vol. 115 page： 504 - 504 2024.3

Brca2((p.T1942fs/+)) dissipates ovarian reserve in rats through oxidative stress in follicular granulosa cells. International journal Open Access

Tanaka H, Motooka Y, Maeda Y, Sonehara R, Nakamura T, Kajiyama H, Mashimo T, Toyokuni S

Free radical research Vol. 58 ( 2 ) page： 130 - 143 2024.2

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

Pathogenic variants of BRCA1/2 constitute hereditary breast and ovarian cancer (HBOC) syndrome, and BRCA1/2 mutant is a risk for various cancers. Whereas the clinical guideline for HBOC patients has been organized for the therapy and prevention of cancer, there is no recommendation on the female reproductive discipline. Indeed, the role of BRCA1/2 pathogenic variants in ovarian reserve has not been established due to the deficiency of appropriate animal models. Here, we used a rat model of Brca2(p.T1942fs/+) mutant of Sprague-Dawley strain with CRISPR-Cas9 editing to evaluate ovarian reserve in females. Fertility and ovarian follicles were evaluated and anti-Müllerian hormone (AMH) was measured at 8–32 weeks of age with a comparison between the wild-type and the mutant rats (MUT). MUT revealed a significantly smaller number of deliveries with fewer total pups. Furthermore, MUT showed a significant decrease in primordial follicles at 20 weeks and a low AMH level at 28 weeks. RNA-sequencing of the ovary at 10 weeks detected acceleration of the DNA damage repair pathway, which was accompanied by oxidative stress-induced DNA double-strand breaks, a decrease in PTEN, and an increase in mTOR in follicular granulosa cells. In conclusion, Brca2(p.T1942fs/+) dissipates primordial follicles via early activation of granulosa cells through oxidative stress, leading to earlier termination of fertility.

DOI： 10.1080/10715762.2024.2320405

Formalin-Fixed Paraffin-Embedded Proteomics of Malignant Mesothelioma and New Candidate Biomarkers Thioredoxin and Superoxide Dismutase 2 for Immunohistochemistry. International journal Open Access

Hiratsuka T, Yoshizawa A, Endo T, Yamamoto T, Toyokuni S, Tsuruyama T

Laboratory investigation; a journal of technical methods and pathology Vol. 104 ( 2 ) page： 100299 2024.2

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

The pathogenesis of malignant mesothelioma (MM) has been extensively investigated, focusing on stress derived from reactive oxygen species. We aimed to identify diagnostic biomarkers of MM by analyzing proteins in formalin-fixed paraffin-embedded specimens using liquid chromatography-mass spectrometry. We extracted proteins from formalin-fixed paraffin-embedded sections of MM tissues (n = 7) and compared their profiles with those of benign mesothelial tissues (n = 4) and alveolar tissue (n = 1). Proteomic data were statistically assessed and profiled using principal component analysis. We were successful in the classification of MM and healthy tissue. The levels of superoxide dismutase 2 (SOD2), an enzyme that converts superoxide anion into oxygen and hydrogen peroxide, and thioredoxin (TXN), which plays a crucial role in reducing disulfide bonds in proteins, primarily contributed to the classification. Other redox-related proteins, such as pyruvate dehydrogenase subunit X, and ceruloplasmin also contributed to the classification. Protein-protein interaction analysis demonstrated that these proteins play essential roles in MM pathogenesis. Immunohistochemistry revealed that TXN levels were significantly lower, whereas SOD2 levels were significantly higher in MM and lung cancer tissues than in controls. Proteomic profiling suggested that MM tissues experienced increased exposure to hydrogen peroxide and other reactive oxygen species. Combining immunohistochemistry for TXN and SOD2 allows for differentiation among MM, lung cancer, and control tissues; hence, TXN and SOD2 may be promising MM biomarkers and therapeutic targets.

DOI： 10.1016/j.labinv.2023.100299

BRCA2の生殖細胞変異は卵胞発育を促進し卵巣予備能の低下を惹起する(BRCA2 germline mutation accelerates follicle maturation, leading to reduced ovarian reserve) Reviewed International journal

田中秀明, 本岡大社, 前田勇貴, 真下知士, 梶山広明, 豊國伸哉

日本病理学会会誌 Vol. 113 ( 1 ) page： 428 - 429 2024.2

病理形態学から発がんメカニズムの本質に迫る環境中の微粒子であるアスベストやタルクによる卵巣発がん(Mechanisms of carcinogenesis revealed by pathomorphology Ovarian carcinogenesis induced by environmental particulates: asbestos and talc) Reviewed International journal

本岡大社, 豊國伸哉

日本病理学会会誌 Vol. 113 ( 1 ) page： 194 - 194 2024.2

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Papers - TOYOKUNI Shinya