MOTS-c: A Mitochondrial-Derived Peptide in Metabolic ResearchMOTS-c: A Mitochondrial-Derived Peptide in Metabolic Research

MOTS-c (Mitochondrial Open Reading frame of the Twelve S rRNA-c) is a 16-amino-acid peptide encoded within the mitochondrial 12S rRNA region — one of the first formally characterized mitochondrial-derived peptides (MDPs) [1]. Since its initial description by Lee and colleagues in 2015, MOTS-c has emerged as an important research probe for studying retrograde mitochondrial-to-nuclear communication and metabolic regulation in preclinical models.

The peptide’s most characterized activity is regulation of cellular metabolism via the AMPK pathway. In cultured myotubes and in mouse skeletal muscle, MOTS-c administration activates AMPK, increases glucose uptake independent of insulin signaling, and shifts metabolism toward fatty-acid oxidation [1]. In diet-induced obese mice, intraperitoneal MOTS-c reversed weight gain and insulin resistance over a multi-week dosing window [1].

Subsequent work has identified nuclear translocation of MOTS-c under metabolic stress. Kim and colleagues demonstrated that glucose restriction triggers AMPK-dependent translocation of MOTS-c to the nucleus, where it regulates expression of antioxidant-response and metabolic genes [2]. This positions MOTS-c as one of the clearest examples of a mitochondrially-encoded peptide acting as a transcriptional regulator.

Aging-related research has also examined MOTS-c. Circulating MOTS-c levels decline with age in rodent serum, and exogenous administration in aged mice restored running endurance and improved indices of physical function on rotarod and grip-strength testing [3]. Complementary cell-culture work has linked MOTS-c signaling to mitochondrial biogenesis markers including PGC-1α [4].

For laboratory studies, MOTS-c is typically supplied as a lyophilized powder requiring reconstitution in sterile aqueous solvent prior to use in cell culture or rodent dosing experiments. Frontier Peptide Labs offers a research-grade MOTS-c vial with third-party HPLC verification for laboratory research use only.

References

1. Lee C, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis. Cell Metab. 2015;21(3):443-54. DOI: 10.1016/j.cmet.2015.02.009
2. Kim KH, et al. The mitochondrial-encoded peptide MOTS-c translocates to the nucleus to regulate nuclear gene expression. Cell Metab. 2018;28(3):516-524. DOI: 10.1016/j.cmet.2018.06.008
3. Reynolds JC, et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline. Nat Commun. 2021;12(1):470. DOI: 10.1038/s41467-020-20790-0
4. Lu H, et al. MOTS-c peptide regulates adipose homeostasis. J Mol Med (Berl). 2019;97(4):473-485. PubMed: 30729259