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YAMAMOTO Kumiko Assistant Professor |
From Graduate School 【 display / non-display 】
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Hokkaido University Graduate School, Division of Veterinary Medicine Doctor Course Completed
2016.04 - 2020.03
Country：Japan
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Hokkaido University of Education Graduate School, Division of Education Master Course Completed
2014.04 - 2016.03
Country：Japan
Degree 【 display / non-display 】
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博士（獣医学） ( 2020.03 北海道大学 )
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修士（教育学） ( 2016.03 北海道教育大学 )
Employment Record in Research 【 display / non-display 】
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Tokyo University of Agriculture Faculty of Bio-Industry Department of Food, Aroma and Cosmetic Chemistry Assistant Professor
2020.04
Papers 【 display / non-display 】
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Ririko Nakaoka, Kazuhiro Kato, Kumiko Yamamoto, Hironobu Yasui, Shingo Matsumoto, Igor A. Kirilyuk, Valery V. Khramtsov, Osamu Inanami, Hiroshi Hirata
Analytical Chemistry 2023.02
Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)
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Metformin preferentially enhances the radio-sensitivity of cancer stem-like cells with highly mitochondrial respiration ability in HMPOS. International journal
Tatsuya Deguchi, Kenji Hosoya, Shango Kim, Yusuke Murase, Kumiko Yamamoto, Tomoki Bo, Hironobu Yasui, Osamu Inanami, Mahiro Okumura
Molecular therapy oncolytics 22 143 - 151 2021.09
Language：English Publishing type：Research paper (scientific journal)
Metformin has many anti-cancer effects, alone or in combination with radiation. However, the mechanism underlying its radio-sensitized effect is still unclear, especially for cancer stem-like cells (CSCs). Here, the radio-sensitized effect of metformin was investigated, and its mechanism was revealed in CSCs derived from canine osteosarcoma cell line (HMPOS), a canine osteosarcoma cell line. Spheroid cells (SCs) were used as CSCs-rich cells derived from sphere formation, and SCs were compared with normal adherent culture cells (ACs). The radio-sensitizing effect of metformin using clonogenic assay and tumor growth in mice xenograft model were evaluated, and the mechanism of its radio-sensitization focusing on mitochondrial function was revealed. Metformin significantly enhanced radio-sensitivity of SCs through its inhibition of the mitochondrial function, as shown by decreased oxygen consumption, decreased mitochondrial membrane potential, and decreased ATP production. Additionally, SCs had a higher ability of mitochondrial respiration than ACs, which may have caused difference of their sensitivity of metformin and irradiation. In conclusion, mitochondrial function might play an important role in the sensitivity of metformin and irradiation, and drugs that target mitochondrial respiration, such as metformin, are promising radio-sensitizers to target CSCs.
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Using the larvae of caddisfly as a biomonitor to assess the spatial distribution and effective half-life of radiocesium in riverine environments in Fukushima, Japan Reviewed
Yuki Matsuo, Kunihiko Nakai, Nozomi Tatsuta, Osamu Inanami, Kumiko Yamamoto, Hazuki Mizukawa, Hiromitsu Nagasaka, Futoshi Mizutani, Youichi Chisaki, Toshiki Aiba, Takashi Ohba, Izumi Watanabe, Hiromi Nabeshi, Taiki Higuchi, Yuki Koga, Hideaki Matsumoto, Kou Nishimuta, Hideki Miyamoto, Tomokazu Haraguchi, Noriko Ryuda, Daisuke Ueno
Physics Open 6 100060 - 100060 2021.02
Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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Masaki Fujimoto, Tomoki Bo, Kumiko Yamamoto, Hironobu Yasui, Tohru Yamamori, Osamu Inanami
Journal of Clinical Biochemistry and Nutrition 67 ( 3 ) 240 - 247 2020.11
Publishing type：Research paper (scientific journal) Publisher：The Society for Free Radical Research Japan
DOI： 10.3164/jcbn.19-80
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Mitochondrial fission promotes radiation-induced increase in intracellular Ca2+ level leading to mitotic catastrophe in mouse breast cancer EMT6 cells. Reviewed
Tomoki Bo, Tohru Yamamori, Kumiko Yamamoto, Masaki Fujimoto, Hironobu Yasui, Osamu Inanami
Biochemical and biophysical research communications 522 ( 1 ) 144 - 150 2020.01
Language：English Publishing type：Research paper (scientific journal)
Mitochondrial dynamics are crucial for cellular survival in response to various stresses. Previously, we reported that Drp1 promoted mitochondrial fission after x-irradiation and its inhibition resulted in reduced cellular radiosensitivity and mitotic catastrophe. However, the mechanisms of radiation-induced mitotic catastrophe related to mitochondrial fission remain unclear. In this study, we investigated the involvement of cellular ATP production, ROS generation, and Ca2+ levels in mitotic catastrophe in EMT6 cells. Knockdown of Drp1 and Fis1, which are mitochondrial fission regulators, resulted in elongated mitochondria and significantly attenuated cellular radiosensitivity. Reduced mitochondrial fission mainly decreased mitotic catastrophe rather than necrosis and apoptosis after irradiation. Cellular ATP contents in Drp1 and Fis1 knockdown cells were similar to those in control cells. N-acetylcysteine and 2-glucopyranoside ascorbic acid have no effect on mitotic catastrophe after irradiation. The cellular [Ca2+]i level increased after irradiation, which was completely suppressed by Drp1 and Fis1 inhibition. Furthermore, BAPTA-AM significantly reduced radiation-induced mitotic catastrophe, indicating that cellular Ca2+ is a key mediator of mitotic catastrophe induction after irradiation. These results suggest that mitochondrial fission is associated with radiation-induced mitotic catastrophe via cytosolic Ca2+ regulation.