What is MOTS-c?
MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA-c) is a mitochondrial-derived peptide composed of 16 amino acids. It plays a vital role in regulating metabolic homeostasis, insulin sensitivity, and energy expenditure. Studies indicate its potential applications in obesity, type 2 diabetes, aging, and skeletal muscle function.
MOTS-c is a naturally occurring peptide encoded by mitochondrial DNA, not nuclear DNA. It is produced in response to metabolic stress and acts as a regulator of energy balance and insulin sensitivity. MOTS-c has been shown to mimic the effects of exercise at the cellular level, particularly in metabolic tissues such as muscle and fat. Research also suggests that MOTS-c levels decrease with age, making it a molecule of interest in age-related metabolic decline [1].
MOTS-c Research
MOTS-c and Metabolic Regulation
MOTS-c has demonstrated the ability to improve insulin sensitivity and regulate glucose metabolism. In murine models, it promoted glucose uptake in skeletal muscle and suppressed fat accumulation despite high-fat feeding. These effects are attributed to AMPK pathway activation, a key regulator of energy metabolism [2].
MOTS-c in Aging and Longevity
Levels of MOTS-c decline with age, but supplementation in animal studies has reversed age-related physical decline. In aged mice, MOTS-c treatment improved endurance, metabolic flexibility, and even extended lifespan. These results suggest MOTS-c may serve as a longevity-promoting peptide [3].
MOTS-c and Muscle Function
MOTS-c plays a role in supporting muscle health by promoting mitochondrial biogenesis and increasing muscle fiber regeneration. In studies on aging mice, it enhanced muscle strength and prevented sarcopenia-related decline when combined with exercise regimens [4].
MOTS-c and Bone Health
Early studies suggest that MOTS-c may protect against bone density loss. In an ovariectomy-induced osteoporosis model, MOTS-c supplementation mitigated bone loss and supported osteoblast activity, indicating a potential for future research into osteoporosis [5].
MOTS-c and Cardiovascular Function
MOTS-c is being explored for its influence on cardiovascular markers. Initial findings show potential for reducing vascular inflammation and enhancing endothelial function. While mechanisms remain under investigation, MOTS-c may contribute to overall cardiovascular resilience [2].
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Referenced Citations
- Lee C, Zeng J, Drew BG, et al. “The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance.” Cell Metabolism. 2015. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9905433/
- Kim KH, Son JM, Benayoun BA, Lee C. “The Mitochondrial-Encoded Peptide MOTS-c Translocates to the Nucleus to Regulate Nuclear Gene Expression in Response to Metabolic Stress.” Cell Metabolism. 2018. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9905433/
- Reynolds JC, Lai RWS, Woodhead JST, et al. “MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis.” Nature Communications. 2021. Available at: https://www.nature.com/articles/s41467-020-20790-0
- Hao Y, Xu Y, Zhang H, et al. “MOTS-c increases muscle regeneration and mitochondrial biogenesis in aged mice.” Histochemistry and Cell Biology. 2024. Available at: https://link.springer.com/article/10.1007/s00418-024-02274-0
- Lu H, Zhang L, Li R, et al. “MOTS-c attenuates bone loss in ovariectomized mice by regulating osteoblast activity.” Journal of Orthopaedic Translation. 2023. Available at: https://www.sciencedirect.com/science/article/pii/S2214031X23000363
