Diabetes & Metabolism Journal

Sulwon Lecture 2021

Basic Research
Exercise, Mitohormesis, and Mitochondrial ORF of the 12S rRNA Type-C (MOTS-c): Tae Kwan Yoon, Chan Hee Lee, Obin Kwon, Min-Seon Kim; Diabetes Metab J. 2022;46(3):402-413. Published online May 25, 2022; DOI: https://doi.org/10.4093/dmj.2022.0092

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Low levels of mitochondrial stress are beneficial for organismal health and survival through a process known as mitohormesis. Mitohormetic responses occur during or after exercise and may mediate some salutary effects of exercise on metabolism. Exercise-related mitohormesis involves reactive oxygen species production, mitochondrial unfolded protein response (UPR^mt), and release of mitochondria-derived peptides (MDPs). MDPs are a group of small peptides encoded by mitochondrial DNA with beneficial metabolic effects. Among MDPs, mitochondrial ORF of the 12S rRNA type-c (MOTS-c) is the most associated with exercise. MOTS-c expression levels increase in skeletal muscles, systemic circulation, and the hypothalamus upon exercise. Systemic MOTS-c administration increases exercise performance by boosting skeletal muscle stress responses and by enhancing metabolic adaptation to exercise. Exogenous MOTS-c also stimulates thermogenesis in subcutaneous white adipose tissues, thereby enhancing energy expenditure and contributing to the anti-obesity effects of exercise training. This review briefly summarizes the mitohormetic mechanisms of exercise with an emphasis on MOTS-c.

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