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Mitochondrial fission promotes radiation-induced increase in intracellular Ca2+ level leading to mitotic catastrophe in mouse breast cancer EMT6 cells

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Title: Mitochondrial fission promotes radiation-induced increase in intracellular Ca2+ level leading to mitotic catastrophe in mouse breast cancer EMT6 cells
Authors: Bo, Tomoki Browse this author
Yamamori, Tohru Browse this author
Yamamoto, Kumiko Browse this author
Fujimoto, Masaki Browse this author
Yasui, Hironobu Browse this author
Inanami, Osamu Browse this author →KAKEN DB
Keywords: Ca2+
Calcium regulation
Mitotic catastrophe
Issue Date: 29-Jan-2020
Publisher: Elsevier
Journal Title: Biochemical and biophysical research communications
Volume: 522
Issue: 1
Start Page: 144
End Page: 150
Publisher DOI: 10.1016/j.bbrc.2019.11.027
Abstract: 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. (C) 2019 Elsevier Inc. All rights reserved.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 稲波 修

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