Faculty Profiles - TOYOKUNI Shinya

Papers - TOYOKUNI Shinya

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Enhancement of ethanol production and cell growth in budding yeast by direct irradiation of low-temperature plasma Reviewed International journal Open Access

Hiromasa Tanaka, Shogo Matsumura, Kenji Ishikawa, Hiroshi Hashizume, Masafumi Ito, Kae Nakamura, Hiroaki Kajiyama, Fumitaka Kikkawa, Mikako Ito, Kinji Ohno, Yasumasa Okazaki, Shinya Toyokuni, Masaaki Mizuno, Masaru Hori

Japanese Journal of Applied Physics Vol. 61 ( SA ) 2022.1

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

Ethanol production by budding yeast was compared between direct and indirect plasma irradiation. We observed enhancement of ethanol production and cell growth not by indirect plasma irradiation but by direct plasma irradiation. Glucose consumption was increased in budding yeast by direct plasma irradiation. Extracellular flux analysis revealed that glycolytic activity in the budding yeast was elevated by direct plasma irradiation. These results suggest that direct plasma irradiation enhances ethanol production in budding yeast by elevating the glycolytic activity.

DOI： 10.35848/1347-4065/ac2037

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Double-edged Sword Role of Iron-loaded Ferritin in Extracellular Vesicles. International journal

Shinya Toyokuni, Yingyi Kong, Hao Zheng, Danyang Mi, Misako Katabuchi, Yashiro Motooka, Fumiya Ito

Journal of cancer prevention Vol. 26 ( 4 ) page： 244 - 249 2021.12

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

Human epidemiological and animal studies have demonstrated that excess iron is a risk for cancer. The responsible mechanisms are: 1) increased intracellular iron catalyzes the Fenton reaction to generate hydroxyl radicals, leading to mutagenic oxidative DNA lesions; 2) iron is necessary for cellular proliferation as cofactors of many enzymes. Thus, iron-excess milieu promotes selecting cellular evolution to ferroptosis-resistance, a major basis for carcinogenesis. Ferritin is a 24-subunit nanocage protein required for iron storage under the regulation of the iron-regulatory protein (IRP)/iron-responsive element (IRE) system. Ferritin is a serum marker, representing total body iron storage. However, how ferritin is secreted extracellularly has been unelucidated. We recently discovered that an exosomal marker CD63 is regulated by the IRP/IRE system and that iron-loaded ferritin is secreted as extracellular vesicles under the guidance of nuclear receptor coactivator 4 (NCOA4). On the other hand, we found that macrophages under asbestos-induced ferroptosis emit ferroptosis-dependent extracellular vesicles (FedEVs), which are received by nearby mesothelial cells, resulting in significant mutagenic DNA damage. Therefore, cells, including macrophages, can share excess iron with other cells, via iron-loaded ferritin packaged in extracellular vesicles as safe non-catalytic iron. However, similar process, such as one involving FedEVs, may cause accumulation of excess iron in other specific cells, which may eventually promote carcinogenesis.

DOI： 10.15430/JCP.2021.26.4.244

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Ferroptosis-dependent extracellular vesicles from macrophage contribute to asbestos-induced mesothelial carcinogenesis through loading ferritin. Reviewed International journal Open Access

Fumiya Ito, Katsuhiro Kato, Izumi Yanatori, Toyoaki Murohara, Shinya Toyokuni

Redox biology Vol. 47 page： 102174 - 102174 2021.11

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

Asbestos-associated diseases remain a social burden worldwide. Our previous studies identified asbestos-induced iron-rich milieu for mesothelial cells with ceaseless macrophage ferroptosis. However, molecular mechanisms how this mutagenic milieu influences mesothelial cells have not been elucidated yet. Here, we propose a novel mechanism that extracellular vesicles (EVs) mediate asbestos-associated mutagenic factors to mesothelial cells. In a mice model of intraperitoneal crocidolite injection, mutagenic milieu highly expressed CD63, an exosomal marker. We then used a GFP-CD63 labeled THP-1 macrophage model exposed to crocidolite/iron, which generated EVs under ferroptotic process. We observed that MeT-5A mesothelial cells can receive and internalize these EVs. Furthermore, we comprehensively analyzed the ferroptosis-dependent EVs (FedEVs) for transported proteins and identified ferritin heavy/light chains as major components. Therefore, we inferred that FedEVs transport iron from ferroptotic macrophages to mesothelial cells. RNA sequencing revealed that the mesothelial cells receiving higher amounts of the FedEVs were mitotic, especially at the S and G2/M phases, by the use of Fucci mesothelial cells. Nuclear 8-hydroxy-2'-deoxyguanosine and γ-H2AX were significantly increased in the recipient mesothelial cells after exposure to FedEVs. Collectively, we here demonstrate a novel mechanism that FedEVs act as a key mutagenic mediator by transporting iron, which contribute to asbestos-induced mesothelial carcinogenesis.

DOI： 10.1016/j.redox.2021.102174

Mitochondrial involvement in the development and progression of diseases. Reviewed International journal

Giuseppe Valacchi, Alessandra Pecorelli, Shinya Toyokuni

Archives of biochemistry and biophysics Vol. 711 page： 109006 - 109006 2021.10

Embryonal erythropoiesis and aging exploit ferroptosis. Reviewed International coauthorship International journal Open Access

Hao Zheng, Li Jiang, Tsuyoshi Tsuduki, Marcus Conrad, Shinya Toyokuni

Redox biology Vol. 48 page： 102175 - 102175 2021.10

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

Ferroptosis is a form of regulated cell necrosis, as a consequence of Fe(II)-dependent lipid peroxidation. Although ferroptosis has been linked to cancer cell death, neurodegeneration and reperfusion injury, physiological roles of ferroptosis have not been elucidated to date mostly due to the lack of appropriate methodologies. Here, we show that 4-hydroxy-2-nonenal (HNE)-modified proteins detected by a HNEJ-1 mouse monoclonal antibody is a robust immunohistochemical technology to locate ferroptosis in tissues in combination with morphological nuclear information, based on various models of ferroptosis, including erastin-induced cysteine-deprivation, conditional Gpx4 knockout and Fe(II)-dependent renal tubular injury, as well as other types of regulated cell death. Specificity of HNEJ-1 with ferroptosis was endorsed by non-selective identification of HNE-modified proteins in an Fe(II)-dependent renal tubular injury model. We further comprehensively searched for signs of ferroptosis in different developmental stages of Fischer-344 rats from E9.5-2.5 years of age. We observed that there was a significant age-dependent increase in ferroptosis in the kidney, spleen, liver, ovary, uterus, cerebellum and bone marrow, which was accompanied by iron accumulation. Not only phagocytic cells but also parenchymal cells were affected. Epidermal ferroptosis in ageing SAMP8 mice was significantly promoted by high-fat or carbohydrate-restricted diets. During embryogenesis of Fischer-344 rats, we found ferroptosis in nucleated erythrocytes at E13.5, which disappeared in enucleated erythrocytes at E18.5. Administration of a ferroptosis inhibitor, liproxstatin-1, significantly delayed erythrocyte enucleation. Therefore, our results demonstrate for the first time the involvement of ferroptosis in physiological processes, such as embryonic erythropoiesis and aging, suggesting the evolutionally acquired mechanism and the inevitable side effects, respectively.

DOI： 10.1016/j.redox.2021.102175

CD63 is regulated by iron via the IRE-IRP system and is important for ferritin secretion by extracellular vesicles. Reviewed International journal Open Access

Izumi Yanatori, Des R Richardson, Herschel S Dhekne, Shinya Toyokuni, Fumio Kishi

Blood Vol. 138 ( 16 ) page： 1490 - 1503 2021.10

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

Extracellular vesicles (EVs) transfer functional molecules between cells. CD63 is a widely recognized EV marker that contributes to EV secretion from cells. However, the regulation of its expression remains largely unknown. Ferritin is a cellular iron storage protein that can be also secreted by the exosome pathway (Truman-Rosentsvit M. et al. BLOOD 131 (2018) 342-352), with serum ferritin levels classically reflecting body iron stores. Iron metabolism-associated proteins, such as ferritin, are intricately regulated by cellular iron levels via the iron responsive element (IRE)-iron regulatory protein (IRP) system. Herein, we present a novel mechanism demonstrating that the expression of the EV-associated protein, CD63, is under the regulation of the IRE-IRP system. We discovered a canonical IRE in the 5'-untranslated region (UTR) of CD63 mRNA responsible for regulating its expression in response to increased iron. Cellular iron-loading caused a marked increase in CD63 expression and the secretion from cells of CD63 positive (i.e., CD63(+)) EVs, which were shown to contain ferritin-H (FtH) and -L (FtL). Our results demonstrate that under iron-loading, intracellular ferritin is transferred via nuclear receptor coactivator 4 (NCOA4) to CD63(+) EVs that are then secreted. Such iron-regulated secretion of the major iron storage protein ferritin via CD63(+) EVs, poses significant impact for understanding the local cell-to-cell exchange of ferritin and iron.

DOI： 10.1182/blood.2021010995

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Mice lacking DYRK2 exhibit congenital malformations with lung hypoplasia and altered Foxf1 expression gradient. Reviewed International journal Open Access

Satomi Yogosawa, Makiko Ohkido, Takuro Horii, Yasumasa Okazaki, Jun Nakayama, Saishu Yoshida, Shinya Toyokuni, Izuho Hatada, Mitsuru Morimoto, Kiyotsugu Yoshida

Communications biology Vol. 4 ( 1 ) page： 1204 - 1204 2021.10

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

Congenital malformations cause life-threatening diseases in pediatrics, yet the molecular mechanism of organogenesis is poorly understood. Here we show that Dyrk2-deficient mice display congenital malformations in multiple organs. Transcriptome analysis reveals molecular pathology of Dyrk2-deficient mice, particularly with respect to Foxf1 reduction. Mutant pups exhibit sudden death soon after birth due to respiratory failure. Detailed analyses of primordial lungs at the early developmental stage demonstrate that Dyrk2 deficiency leads to altered airway branching and insufficient alveolar development. Furthermore, the Foxf1 expression gradient in mutant lung mesenchyme is disrupted, reducing Foxf1 target genes, which are necessary for proper airway and alveolar development. In ex vivo lung culture system, we rescue the expression of Foxf1 and its target genes in Dyrk2-deficient lung by restoring Shh signaling activity. Taken together, we demonstrate that Dyrk2 is essential for embryogenesis and its disruption results in congenital malformation.

DOI： 10.1038/s42003-021-02734-6

Role of ferroptosis in nanofiber-induced carcinogenesis International journal

Toyokuni Shinya, Ito Fumiya, Motooka Yashiro

Metallomics Research Vol. 1 ( 1 ) page： rev-14 - rev-21 2021.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Society for Biomedical Research on Trace Elements

<p>Biopersistent nanofibers with specified physical dimension are unexpected human carcinogens whether they are natural or synthetic. Asbestos, a natural fibrous mineral, is classified as a definite human carcinogen (IARC Group 1) to cause malignant mesothelioma (MM) and lung cancer. Multi-walled carbon nanotube of 50 nm-diameter was defined in 2014 as a possible carcinogen (IARC Group 2B) toward MM, fortunately with no authorized patients thus far. Carcinogenic mechanism of asbestos has been a mystery for a long time. It is now recognized that asbestos goes through lung parenchyma by collecting hemoglobin-derived iron to reach pleural cavity, which takes several decades. Iron-loaded asbestos can induce oxidative damage directly to mesothelial cells, carcinogenesis-target cells lining somatic cavities. Recently, it was clarified that surrounding stromal environment are as important for mesothelial carcinogenesis. The novel concept here is ceaseless ferroptosis of macrophages, which forms a Fe(II)-dependent stromal mutagenic milieu indirectly for mesothelial cells and indeed is a revised understanding of frustrated phagocytosis. Deposition of foreign materials eventually causes iron accumulation <i>in situ</i> due to the innate characteristic of preserving iron inside cells. Nanofiber-induced carcinogenesis may be involved in other human carcinogenesis, including ovarian cancer. Alternatively, iron excess can be an optimal target of cancer prevention and cancer treatment. </p>

DOI： 10.11299/metallomicsresearch.mr202102

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Txn1 mutation causes epilepsy associated with vacuolar degeneration in the midbrain

Iori Ohmori, Mamoru Ouchida, Hirohiko Imai, Saeko Ishida, Shinya Toyokuni, Tomoji Mashimo

bioRxiv 2021.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Cold Spring Harbor Laboratory

<title>Abstract</title>Thioredoxin (TXN), encoded by <italic>Txn1</italic>, acts as a critical antioxidant in the defense against oxidative stress by regulating the dithiol/disulfide balance of interacting proteins. The role of TXN in the central nervous system (CNS) is largely unknown. A phenotype-driven study of <italic>N</italic>-ethyl-<italic>N</italic>-nitrosourea-mutated rats with running seizures at around five-week of age revealed the relevance of <italic>Txn1</italic> mutations to CNS disorders. Genetic mapping identified <italic>Txn1</italic>-F54L in epileptic rats. The insulin-reducing activity of <italic>Txn1</italic>-F54L rats was approximately one-third that of the wild-type. Vacuolar degeneration in the midbrain, mainly in the thalamus and the inferior colliculus, was observed in the <italic>Txn1</italic>-F54L rats. The lesions displayed neuronal and oligodendrocyte cell death. Neurons in <italic>Txn1</italic>-F54L rats showed morphological changes in the mitochondria. Vacuolar degeneration began at three weeks of age, and spontaneous repair began at seven weeks; a dramatic change from cell death to repair occurred in the midbrain during a restricted period. In conclusion, <italic>Txn1</italic> is essential for the development of the midbrain in juvenile rats.

DOI： 10.1101/2021.10.07.463470

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Plasma-activated Ringer's lactate solution inhibits the cellular respiratory system in HeLa cells Reviewed International journal

Hiromasa Tanaka, Shogo Maeda, Kae Nakamura, Hiroshi Hashizume, Kenji Ishikawa, Mikako Ito, Kinji Ohno, Masaaki Mizuno, Yashiro Motooka, Yasumasa Okazaki, Shinya Toyokuni, Hiroaki Kajiyama, Fumitaka Kikkawa, Masaru Hori

PLASMA PROCESSES AND POLYMERS Vol. 18 ( 10 ) 2021.10

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

Nonequilibrium atmospheric pressure plasma has enabled a variety of new applications in medicine, agriculture, and other industries. It is particularly noteworthy that plasma itself and/or plasma-activated culture medium have been shown to preferentially kill various cancer cells. We have previously developed a plasma-activated Ringer's lactate solution (PAL) for use as a new cancer treatment. In this study, behaviors of extracellular and intracellular reactive oxygen and nitrogen species in the cellular respiratory system of PAL-treated HeLa cells were investigated using an extracellular flux analyzer and a probe to measure mitochondrial membrane potential. In PAL-treated HeLa cells, extracellular hydrogen peroxide in PAL was found to be responsible for the induction of intracellular hydrogen peroxide and apoptosis, while other components in PAL are responsible for the induction of non-H2O2 intracellular ROS and non-apoptotic cell death, which should be clarified by further experiments. We believe that these are long-lived species derived from plasma-activated lactates. Furthermore, we found that the plasma-activated lactates inhibited glycolysis and the tricarboxylic acid (TCA) cycle, but not the electron transport chain in HeLa cells. These results suggest that PAL induces multiple modes of cell death, including apoptosis through hydrogen peroxide, and non-apoptotic cell death associated with the impairment of mitochondrial functions (glycolysis and TCA cycle). These findings shed light on the novel mechanism underlying plasma-activated lactate-induced cell death.

DOI： 10.1002/ppap.202100056

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Low temperature plasma irradiation products of sodium lactate solution that induce cell death on U251SP glioblastoma cells were identified. Reviewed International journal Open Access

Hiromasa Tanaka, Yugo Hosoi, Kenji Ishikawa, Jun Yoshitake, Takahiro Shibata, Koji Uchida, Hiroshi Hashizume, Masaaki Mizuno, Yasumasa Okazaki, Shinya Toyokuni, Kae Nakamura, Hiroaki Kajiyama, Fumitaka Kikkawa, Masaru Hori

Scientific reports Vol. 11 ( 1 ) page： 18488 - 18488 2021.9

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

Low-temperature plasma is being widely used in the various fields of life science, such as medicine and agriculture. Plasma-activated solutions have been proposed as potential cancer therapeutic reagents. We previously reported that plasma-activated Ringer's lactate solution exhibited selective cancer-killing effects, and that the plasma-treated L-sodium lactate in the solution was an anti-tumor factor; however, the components that are generated through the interactions between plasma and L-sodium lactate and the components responsible for the selective killing of cancer cells remain unidentified. In this study, we quantified several major chemical products, such as pyruvate, formate, and acetate, in plasma-activated L-sodium lactate solution by nuclear magnetic resonance analysis. We further identified novel chemical products, such as glyoxylate and 2,3-dimethyltartrate, in the solution by direct infusion-electrospray ionization with tandem mass spectrometry analysis. We found that 2,3-dimethyltartrate exhibited cytotoxic effects in glioblastoma cells, but not in normal astrocytes. These findings shed light on the identities of the components that are responsible for the selective cytotoxic effect of plasma-activated solutions on cancer cells, and provide useful data for the potential development of cancer treatments using plasma-activated L-sodium lactate solution.

DOI： 10.1038/s41598-021-98020-w

女性器へのタルクの曝露は鉄過剰環境を形成し卵巣がんの発がんに関わる

本岡大社, 伊藤文哉, 田代浩徳, 片渕秀隆, 豊國伸哉

日本癌学会総会記事 Vol. 80回 page： [E1 - 6] 2021.9

BRCA1欠損は腎臓における鉄代謝の変化と酸化ストレスによる腎発がんに関わる

孔穎怡, 本岡大社, 赤塚慎也, 真下知士, 今岡達彦, 豊國伸哉

日本癌学会総会記事 Vol. 80回 page： [P2 - 1] 2021.9

変革する病理学:形態診断から普遍的研究プラットフォームへ実験病理学に起源を持つがんのフェロトーシス抵抗性

豊國伸哉, Zheng Hao, Kong Yingyi, Yaguang Luo, 本岡大社

日本癌学会総会記事 Vol. 80回 page： [S10 - 6] 2021.9

Pericentromeric noncoding RNA changes DNA binding of CTCF and inflammatory gene expression in senescence and cancer. Reviewed International journal Open Access

Kenichi Miyata, Yoshinori Imai, Satoshi Hori, Mika Nishio, Tze Mun Loo, Ryo Okada, Liying Yang, Tomoyoshi Nakadai, Reo Maruyama, Risa Fujii, Koji Ueda, Li Jiang, Hao Zheng, Shinya Toyokuni, Toyonori Sakata, Katsuhiko Shirahige, Ryosuke Kojima, Mizuho Nakayama, Masanobu Oshima, Satoshi Nagayama, Hiroyuki Seimiya, Toru Hirota, Hideyuki Saya, Eiji Hara, Akiko Takahashi

Proceedings of the National Academy of Sciences of the United States of America Vol. 118 ( 35 ) 2021.8

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

Cellular senescence causes a dramatic alteration of chromatin organization and changes the gene expression profile of proinflammatory factors, thereby contributing to various age-related pathologies through the senescence-associated secretory phenotype (SASP). Chromatin organization and global gene expression are maintained by the CCCTC-binding factor (CTCF); however, the molecular mechanism underlying CTCF regulation and its association with SASP gene expression remains unclear. We discovered that noncoding RNA (ncRNA) derived from normally silenced pericentromeric repetitive sequences directly impairs the DNA binding of CTCF. This CTCF disturbance increases the accessibility of chromatin and activates the transcription of SASP-like inflammatory genes, promoting malignant transformation. Notably, pericentromeric ncRNA was transferred into surrounding cells via small extracellular vesicles acting as a tumorigenic SASP factor. Because CTCF blocks the expression of pericentromeric ncRNA in young cells, the down-regulation of CTCF during cellular senescence triggers the up-regulation of this ncRNA and SASP-related inflammatory gene expression. In this study, we show that pericentromeric ncRNA provokes chromosomal alteration by inhibiting CTCF, leading to a SASP-like inflammatory response in a cell-autonomous and non-cell-autonomous manner and thus may contribute to the risk of tumorigenesis during aging.

DOI： 10.1073/pnas.2025647118

Prenatal Molecular Hydrogen Administration Ameliorates Several Findings in Nitrofen-Induced Congenital Diaphragmatic Hernia. Reviewed International journal Open Access

Mayo Miura, Kenji Imai, Hiroyuki Tsuda, Rika Miki, Sho Tano, Yumiko Ito, Shima Hirako-Takamura, Yoshinori Moriyama, Takafumi Ushida, Yukako Iitani, Tomoko Nakano-Kobayashi, Shinya Toyokuni, Hiroaki Kajiyama, Tomomi Kotani

International journal of molecular sciences Vol. 22 ( 17 ) 2021.8

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

Oxidative stress plays a pathological role in pulmonary hypoplasia and pulmonary hypertension in congenital diaphragmatic hernia (CDH). This study investigated the effect of molecular hydrogen (H2), an antioxidant, on CDH pathology induced by nitrofen. Sprague-Dawley rats were divided into three groups: control, CDH, and CDH + hydrogen-rich water (HW). Pregnant dams of CDH + HW pups were orally administered HW from embryonic day 10 until parturition. Gasometric evaluation and histological, immunohistochemical, and real-time polymerase chain reaction analyses were performed. Gasometric results (pH, pO2, and pCO2 levels) were better in the CDH + HW group than in the CDH group. The CDH + HW group showed amelioration of alveolarization and pulmonary artery remodeling compared with the CDH group. Oxidative stress (8-hydroxy-2'-deoxyguanosine-positive-cell score) in the pulmonary arteries and mRNA levels of protein-containing pulmonary surfactant that protects against pulmonary collapse (surfactant protein A) were significantly attenuated in the CDH + HW group compared with the CDH group. Overall, prenatal H2 administration improved respiratory function by attenuating lung morphology and pulmonary artery thickening in CDH rat models. Thus, H2 administration in pregnant women with diagnosed fetal CDH might be a novel antenatal intervention strategy to reduce newborn mortality due to CDH.

DOI： 10.3390/ijms22179500

Role and management of oxidative stress in human disease. Reviewed International journal Open Access

Rahul Checker, Deepak Sharma, Santosh K Sandur, Shinya Toyokuni

Free radical research Vol. 55 ( 8 ) page： 755 - 757 2021.8

Non-thermal plasma-induced DMPO-OH yields hydrogen peroxide. International journal

Yasumasa Okazaki, Hiromasa Tanaka, Ken-Ichiro Matsumoto, Masaru Hori, Shinya Toyokuni

Archives of biochemistry and biophysics Vol. 705 page： 108901 - 108901 2021.7

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

Recent developments in electronics have enabled the medical applications of non-thermal plasma (NTP), which elicits reactive oxygen species (ROS) and reactive nitrogen species (RNS), such as hydroxyl radical (●OH), hydrogen peroxide (H2O2), singlet oxygen (1O2), superoxide (O2●-), ozone, and nitric oxide at near-physiological temperatures. In preclinical studies or human clinical trials, NTP promotes blood coagulation, eradication of bacterial, viral and biofilm-related infections, wound healing, and cancer cell death. To elucidate the solution-phase biological effects of NTP in the presence of biocompatible reducing agents, we employed electron paramagnetic resonance (EPR) spectroscopy to quantify ●OH using a spin-trapping probe, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO); 1O2 using a fluorescent probe; and O2●- and H2O2 using luminescent probes in the presence of thiols or tempol. NTP-induced ●OH was significantly scavenged by dithiothreitol (DTT), reduced glutathione (GSH), and oxidized glutathione (GSSG) in 2 or 5 mM DMPO. NTP-induced O2●- was significantly scavenged by 10 μM DTT and GSH, while 1O2 was not efficiently scavenged by these compounds. GSSG degraded H2O2 more effectively than GSH and DTT, suggesting that the disulfide bonds reacted with H2O2. In the presence of 1-50 mM DMPO, NTP-induced H2O2 quantities were unchanged. The inhibitory effect of tempol concentration (50 and 100 μM) on H2O2 production was observed in 1 and 10 mM DMPO, whereas it became ineffective in 50 mM DMPO. Furthermore, DMPO-OH did not interact with tempol. These results suggest that DMPO and tempol react competitively with O2●-. Further studies are warranted to elucidate the interaction between NTP-induced ROS and biomolecules.

DOI： 10.1016/j.abb.2021.108901

Lysosomal nitric oxide determines transition from autophagy to ferroptosis after exposure to plasma-activated Ringer's lactate. International journal Open Access

Li Jiang, Hao Zheng, Qinying Lyu, Shotaro Hayashi, Kotaro Sato, Yoshitaka Sekido, Kae Nakamura, Hiromasa Tanaka, Kenji Ishikawa, Hiroaki Kajiyama, Masaaki Mizuno, Masaru Hori, Shinya Toyokuni

Redox biology Vol. 43 page： 101989 - 101989 2021.7

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

Non-thermal plasma (NTP), an engineered technology to generate reactive species, induces ferroptosis and/or apoptosis specifically in various-type cancer cells. NTP-activated Ringer's lactate (PAL) is another modality for cancer therapy at preclinical stage. Here we found that PAL induces selective ferroptosis of malignant mesothelioma (MM) cells, where non-targeted metabolome screening identified upregulated citrulline-nitric oxide (.NO) cycle as a PAL target. .NO probe detected biphasic peaks transiently at PAL exposure with time-dependent increase, which was responsible for inducible . NO synthase (iNOS) overexpression through NF-κB activation. .NO and lipid peroxidation occupied lysosomes as a major compartment with increased TFEB expression. Not only ferrostatin-1 but inhibitors for . NO and/or iNOS could suppress this ferroptosis. PAL-induced ferroptosis accompanied autophagic process in the early phase, as demonstrated by an increase in essential amino acids, LC3B-II, p62 and LAMP1, transforming into the later phase with boosted lipid peroxidation. Therefore, .NO-mediated lysosomal impairment is central in PAL-induced ferroptosis.

DOI： 10.1016/j.redox.2021.101989

L-Dehydroascorbate efficiently degrades non-thermal plasma-induced hydrogen peroxide International journal

Okazaki Y.

Archives of Biochemistry and Biophysics Vol. 700 2021.3

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Papers - TOYOKUNI Shinya