What is MOTS-c?
MOTS-c (mitochondrial open reading frame of the 12S rRNA type-c) is a short peptide of roughly 16 amino acids encoded by a short open reading frame within the mitochondrial 12S rRNA gene region. It belongs to a class of molecules described in the literature as mitochondrial-derived peptides (MDPs), which are studied as putative signaling molecules between the mitochondria and the rest of the cell.
Since its initial description in the research literature, MOTS-c has been characterized in cell-based and animal models as a regulatory peptide associated with cellular metabolism. In these reports, it has been detected in skeletal muscle and in circulation, and researchers have examined how its expression appears to shift under metabolic stress. It is supplied by VANTA strictly as a reference compound for in-vitro and preclinical laboratory investigation.
Studied mechanisms
In published preclinical and in-vitro work, MOTS-c has been most frequently associated with the AMP-activated protein kinase (AMPK) signaling axis. Researchers have reported that MOTS-c appears to influence the folate-methionine cycle and AICAR/AMPK signaling in cell models, and that under conditions such as glucose restriction it can translocate to the nucleus and is associated with altered expression of stress-response and antioxidant-response-element genes.
Additional mechanistic studies have examined MOTS-c in the context of PGC-1alpha-related and AMPK-dependent mitochondrial bioenergetics in muscle models, as well as reductions in mitochondrial reactive-oxygen-species emission in certain in-vitro systems. These descriptions reflect mechanisms reported by investigators in laboratory models and are not statements about effects in humans.
Research models and findings (hedged)
MOTS-c has been studied across rodent and cell-culture systems. Early reports described it as a mitochondrially encoded peptide associated with metabolic homeostasis in models of diet-induced and age-related metabolic dysfunction, where researchers examined markers of insulin sensitivity and adiposity in mice.
It has also been investigated as a candidate exercise-associated factor. In aging-model work, intermittently administered MOTS-c was associated in mice with measures of physical capacity such as treadmill running time, and investigators have observed exercise-induced changes in endogenous MOTS-c in muscle and circulation. Separate exercise studies in diabetic sand rats reported correlations between interval-exercise protocols and PGC-1alpha, GLUT4, and AMPK protein markers alongside MOTS-c.
These are observations from controlled preclinical models. They do not establish any outcome in humans, and nothing here should be read as guidance for use.
Why purity and identity matter in research
For a peptide studied through mechanism-sensitive readouts like AMPK signaling and mitochondrial bioenergetics, the integrity of the test article is a core experimental variable. Truncated sequences, deletion or insertion byproducts, residual synthesis reagents, and counter-ion or moisture content can all confound results and undermine reproducibility between batches.
Because of this, reference-grade characterization is treated by laboratories as a prerequisite rather than an extra. Researchers generally expect documented evidence of both chemical purity and confirmed molecular identity before a compound enters an assay, so that observed effects can be attributed to the intended sequence rather than to impurities.
How VANTA verifies it
VANTA characterizes each MOTS-c lot before release. Purity is assessed by reversed-phase high-performance liquid chromatography (HPLC), which resolves the target peptide from related impurities and supports a quantified purity value. Identity is confirmed by mass spectrometry, where the measured mass is compared against the theoretical monoisotopic or average mass of the defined MOTS-c sequence.
Every batch ships with a per-batch Certificate of Analysis (COA) that documents these results alongside lot identifiers, so a researcher can match the material in hand to its analytical record. This documentation supports traceability and experimental reproducibility. All VANTA materials are sold for laboratory and research use only and are not for human or veterinary use.
References
- 1.Lee C. et al. (2015) - The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance (Cell Metabolism)
- 2.Kim K.H. et al. (2018) - MOTS-c translocates to the nucleus to regulate nuclear gene expression in response to metabolic stress (Cell Metabolism)
- 3.Reynolds J.C. et al. (2021) - MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis (Nature Communications / PMC)
- 4.Lee C., Kim K.H., Cohen P. (2016) - MOTS-c: A novel mitochondrial-derived peptide regulating muscle and fat metabolism (review, Free Radical Biology and Medicine)
- 5.Parseh S. et al. (2024) - An 8-week study on the effects of high and moderate-intensity interval exercises on mitochondrial MOTS-c changes and their relation to metabolic markers in male diabetic sand rats (Diabetes Research and Clinical Practice)