Takahiro Kataoka, Hina Shuto, Junki Yano, Shota Naoe, Tsuyoshi Ishida, Tetsuya Nakada, Keiko Yamato, Katsumi Hanamoto, Takaharu Nomura, Kiyonori Yamaoka
Journal of radiation research 2020 Jul 06The forced swim test (FST) is a screening model for antidepressant activity; it causes immobility and induces oxidative stress. We previously reported that radon inhalation has antidepressant-like effects in mice potentially through the activation of antioxidative functions upon radon inhalation. This study aimed to investigate the effect of prior and post low-dose X-irradiation (0.1, 0.5, 1.0 and 2.0 Gy) on FST-induced immobility and oxidative stress in the mouse brain, and the differences, if any, between the two. Mice received X-irradiation before or after the FST repeatedly for 5 days. In the post-FST-irradiated group, an additional FST was conducted 4 h after the last irradiation. Consequently, animals receiving prior X-irradiation (0.1 Gy) had better mobility outcomes than sham-irradiated mice; however, their levels of lipid peroxide (LPO), an oxidative stress marker, remained unchanged. However, animals that received post-FST X-irradiation (0.5 Gy) had better mobility outcomes and their LPO levels were significantly lower than those of the sham-irradiated mice. The present results indicate that 0.5 Gy X-irradiation after FST inhibits FST-induced immobility and oxidative stress in mice. © Crown copyright 2020.
Takahiro Kataoka, Hina Shuto, Junki Yano, Shota Naoe, Tsuyoshi Ishida, Tetsuya Nakada, Keiko Yamato, Katsumi Hanamoto, Takaharu Nomura, Kiyonori Yamaoka. X-Irradiation at 0.5 Gy after the forced swim test reduces forced swimming-induced immobility in mice. Journal of radiation research. 2020 Jul 06;61(4):517-523
PMID: 32346734
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