Satoh, Akiho Tokushima University
堀ノ内, 裕也 Tokushima University
Watanabe, Hiroaki Tokushima University
Imao, Mizuki Tokushima University
今西, 正樹 Tokushima University
武智, 研志 Tokushima University
Hirayama, Tasuku Gifu Pharmaceutical University
永澤, 秀子 Gifu Pharmaceutical University
mitogen-activated protein kinases(MAPKs)
Skeletal muscle atrophy is caused by disruption in the homeostatic balance of muscle degeneration and regeneration under various pathophysiological conditions. We have previously reported that iron accumulation induces skeletal muscle atrophy via a ubiquitin ligase-dependent pathway. However, the potential effect of iron accumulation on muscle regeneration remains unclear. To examine the effect of iron accumulation on myogenesis, we used a mouse model with cardiotoxin (CTX)-induced muscle regeneration in vivo and C2C12 mice myoblast cells in vitro. In mice with iron overload, the skeletal muscles exhibited increased oxidative stress and decreased expression of satellite cell markers. Following CTX-induced muscle injury, these mice also displayed delayed muscle regeneration with a decrease in the size of regenerating myofibers, reduced expression of myoblast differentiation markers, and decreased phosphorylation of mitogen-activated protein kinase signaling pathways. In vitro, iron overload also suppressed the differentiation of C2C12 myoblast cells, but the suppression could be reversed by superoxide scavenging using tempol. Excess iron inhibits myogenesis via oxidative stress, leading to an imbalance in skeletal muscle homeostasis.
The FASEB Journal
Federation of American Societies for Experimental Biology|John Wiley & Sons
This is the peer reviewed version of the following article: Ikeda, Y., Satoh, A., Horinouchi, Y., Hamano, H., Watanabe, H., Imao, M., Imanishi, M., Zamami, Y., Takechi, K., Izawa‐Ishizawa, Y., Miyamoto, L., Hirayama, T., Nagasawa, H., Ishizawa, K., Aihara, K.‐I., Tsuchiya, K. and Tamaki, T. (2019), Iron accumulation causes impaired myogenesis correlated with MAPK signaling pathway inhibition by oxidative stress. Faseb, 33: 9551-9564, which has been published in final form at https://doi.org/10.1096/fj.201802724RR. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
faseb_33_8_9551.pdf 1.94 MB