MOTS-c
Also known as: Mitochondrial Open Reading Frame of the 12S rRNA-c
A 16-amino-acid, mitochondrial-DNA-encoded peptide studied as an exercise mimetic for its effects on AMPK activation and metabolic homeostasis.
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Molecular Data
- Class
- 16-amino-acid mitochondrial-derived peptide (MDP) / Metabolic regulator
- Molecular Weight
- 2,174.59 Da
- Molecular Formula
- C₁₀₁H₁₅₂N₂₈O₂₂S₂
- Half-Life
- Short (estimated from rodent pharmacokinetic data; precise human half-life not established)
- Sequence / Structure
- Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg
Mechanism of Action
MOTS-c is unusual among signaling peptides in that it is encoded within the mitochondrial genome itself — specifically the 12S rRNA region of mitochondrial DNA — rather than the nuclear genome. Once translated, it translocates to the cytoplasm and nucleus to influence metabolic gene programs.
- AMPK activation: MOTS-c inhibits the folate-methionine cycle and its linked de novo purine biosynthesis pathway, causing AICAR to accumulate and activate AMP-activated protein kinase (AMPK) — the same energy-sensing pathway engaged by exercise and caloric restriction.
- Glucose uptake: Downstream of AMPK activation, MOTS-c promotes GLUT4 translocation to the cell membrane, increasing glucose uptake in skeletal muscle independent of insulin signaling.
- Mitochondrial–nuclear communication: Under metabolic stress, MOTS-c translocates to the nucleus and regulates antioxidant response element (ARE)-containing genes, positioning it as a messenger between mitochondrial status and nuclear gene expression.
- Exercise mimetic activity: Because MOTS-c reproduces several molecular signatures of aerobic exercise training (AMPK activation, improved insulin sensitivity, enhanced mitochondrial respiratory capacity), it is studied as a tool for isolating exercise-associated metabolic pathways from physical activity itself.
Research History
MOTS-c was first described in 2015 by Changhan Lee and colleagues at the University of Southern California's Leonard Davis School of Gerontology, in a study published in Cell Metabolism. The discovery was notable because MOTS-c is one of only a small number of peptides now known to be encoded by mitochondrial rather than nuclear DNA.
The foundational study demonstrated that MOTS-c administration improved insulin sensitivity on euglycemic clamp testing in mice, and that sustained lower-dose administration over 8 weeks attenuated diet-induced obesity and restored glucose tolerance in a high-fat-diet model. These findings established MOTS-c's core research profile as a regulator of glucose and lipid metabolism acting through AMPK.
Subsequent research has extended into exercise physiology (MOTS-c levels rise in response to physical activity in both rodent and human studies), aging biology (age-related decline in circulating MOTS-c has been reported), and pancreatic islet cell senescence. As of the most recent published research, MOTS-c remains an investigational compound studied in preclinical and early translational settings; it has not been evaluated in large-scale human clinical trials or approved for any therapeutic use.
Notable Studies
The Mitochondrial-Derived Peptide MOTS-c Promotes Metabolic Homeostasis and Reduces Obesity and Insulin Resistance
2015Lee C, Zeng J, Drew BG, et al. · Cell Metabolism
Foundational paper describing MOTS-c's discovery and demonstrating improved insulin sensitivity (euglycemic clamp) and attenuated diet-induced obesity with sustained lower-dose administration in mice.
MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis
2021Reynolds JC, Lai RW, Woodhead JST, et al. · Nature Communications
Demonstrated that MOTS-c levels rise with exercise and decline with age, and that administration in older mice improved physical performance and muscle function.
MOTS-c: A promising mitochondrial-derived peptide for therapeutic exploitation
2023Kim KH, Son JM, Benayoun BA, Lee C. · Frontiers in Endocrinology
Review summarizing MOTS-c's proposed mechanisms and research applications across metabolic disease, aging, and exercise physiology.
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