MOTS-c

MOTS-c is a 16-amino-acid peptide unusual among research peptides because it is not encoded by nuclear DNA — its sequence (MRWQEMGYIFYPRKLR) is derived from a short open reading frame within the mitochondrial 12S rRNA gene, placing it in a small, only recently characterized class of "mitochondrial-derived peptides" (MDPs) with independent signaling functions. This dual mitochondrial-nuclear origin positions MOTS-c as a candidate retrograde signaling molecule, capable of translocating to the nucleus under conditions of metabolic stress to influence gene expression programs tied to energy metabolism and cellular stress adaptation. Its primary mechanism of research interest is activation of AMPK (AMP-activated protein kinase), a central cellular energy sensor, through which MOTS-c has been studied for downstream effects on glucose uptake, insulin sensitivity, and metabolic adaptation to physical activity and caloric stress. Because it directly links mitochondrial genome output to whole-cell and whole-organism metabolic regulation, MOTS-c has become a distinctive subject for research bridging mitochondrial biology, exercise physiology, and aging science. Peptides.SO currently aggregates 138 supplier listings for MOTS-c from 98 distinct vendors, 137 of them in stock as of September 2026; across the 56 listings whose quantities normalize to a per-milligram basis the median price is $7.00/mg, with the middle half of the market between $4.68 and $9.93/mg.

Mechanism of Action:

MOTS-c exerts its metabolic effects through a multi-step mechanism that begins in the mitochondria and propagates outward to the nucleus and then systemically. Under basal conditions, MOTS-c is produced in mitochondria and released into the cytoplasm; under metabolic stress (high AMP:ATP ratios, glucose restriction, or exercise), cytoplasmic MOTS-c translocates to the nucleus where it activates antioxidant response element (ARE)-driven gene expression. The primary effector pathway downstream is AMPK activation, which triggers phosphorylation of ACC (acetyl-CoA carboxylase, inhibiting fatty acid synthesis and stimulating beta-oxidation), promotes GLUT4 translocation to the plasma membrane (increasing glucose uptake in skeletal muscle), and reduces hepatic gluconeogenesis. Studies in adipocytes and skeletal muscle cells demonstrate that MOTS-c directly improves insulin-stimulated glucose uptake independently of exogenous insulin signaling, making it a research tool for studying both insulin sensitization and exercise-mimetic metabolic effects. The AMPK pathway also mediates MOTS-c's reported effects on reactive oxygen species (ROS) scavenging via upregulation of superoxide dismutase and catalase — enzymes whose expression declines with age and in obesity. Recent work indicates that serum MOTS-c levels rise significantly during aerobic exercise in humans, establishing it as an exercise-regulated hormone (exercise factor or exerkine), which opens research directions for understanding how physical activity communicates its metabolic benefits at the molecular level.

Key Research Studies:

Lee C et al. originally described MOTS-c as a mitochondrial-derived peptide that promotes metabolic homeostasis, demonstrating that systemic MOTS-c administration in high-fat diet-fed mice significantly reduced fat mass, improved insulin sensitivity (measured by ITT and GTT), and restored skeletal muscle AMPK activation — effects that recapitulated many hallmarks of caloric restriction and exercise training without changes in food intake. PubMed PMID: 25738459.

Reynolds JC et al. published key findings establishing MOTS-c as an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. The study showed MOTS-c levels increased in response to exercise in both mice and humans, and that exogenous MOTS-c administration in aged mice improved grip strength, treadmill performance, and metabolic parameters — suggesting a mechanistic link between mitochondrial output, exercise response, and age-related functional decline. PubMed PMID: 33473109.

Ramanjaneya M et al. examined MOTS-c levels in human subjects with type 2 diabetes versus healthy controls, finding lower circulating MOTS-c in diabetic subjects and inverse correlations with fasting glucose, HbA1c, and body mass index — establishing MOTS-c as a potentially relevant biomarker in metabolic disease research and supporting the inverse relationship between metabolic health and MOTS-c secretion. PubMed PMID: 30914034.

Kim SJ et al. showed that MOTS-c regulated adaptive thermogenesis in brown adipose tissue and improved whole-body energy expenditure in mice through AMPK-mediated mechanisms, adding adipose tissue biology to the list of research targets and providing mechanistic detail for the body composition changes observed in earlier metabolic studies. PubMed PMID: 30442768.

Research Concentrations Used in Studies:

Animal metabolic studies have primarily used daily subcutaneous injections of 5–15 mg/kg body weight in standard C57BL/6J mouse models, dissolved in PBS or normal saline at concentrations of 1–5 mg/mL. Cell culture studies use concentrations of 0.1–10 μM in standard culture media for glucose uptake and AMPK activation assays. The 16-amino-acid sequence is hydrophilic and dissolves readily in aqueous buffers at physiological pH; no organic co-solvents are required. Reconstituted solutions are stable for 7–14 days at 4°C and indefinitely at −80°C when properly aliquoted to avoid freeze-thaw degradation.

Potential Research Applications:

AMPK activation and cellular energy-sensing pathway studies in vitro and in vivo Insulin sensitivity and glucose uptake research in diet-induced obesity and type 2 diabetes models Mitochondrial-to-nuclear retrograde signaling investigations and ARE-gene expression studies Exercise-adaptation and skeletal muscle metabolism research (exercise mimetic studies) Age-related physical decline and muscle homeostasis models in aged mice Metabolic adaptation to caloric restriction and energy stress Brown adipose tissue thermogenesis and adaptive energy expenditure research Exerkine biology — understanding how exercise signals systemic metabolic benefits Biomarker research correlating MOTS-c levels with metabolic disease severity

Safety Profile from Published Research:

MOTS-c has demonstrated a favorable safety profile in published rodent studies. Chronic daily dosing at 5–15 mg/kg for periods of 4–8 weeks in high-fat diet models produced no overt toxicity, no changes in kidney or liver enzyme markers, and no behavioral abnormalities. Body temperature, food intake, and organ weights were not adversely affected in published metabolic studies. Because MOTS-c arises from the mitochondrial genome and circulates endogenously in humans (with levels measured in plasma and skeletal muscle tissue), it is considered structurally native — though synthetic preparations require the same handling precautions as any research peptide. No carcinogenicity, reproductive toxicity, or genotoxicity data have been published in peer-reviewed literature for MOTS-c specifically. All material supplied here is strictly for laboratory research use only (RUO) and is not for human or veterinary application.

Marketplace Snapshot (September 2026, Peptides.SO listings data): Tracked listings: 138 from 98 distinct suppliers (137 in stock) Listings with a verifiable per-mg price: 56 Median price per mg: $7.00 (interquartile range $4.68 to $9.93) Lowest verified per-mg price: $2.00/mg NG Peptide: $80.00 for 40 mg ($2.00/mg) Modern Research Peptides: $60.00 for 30 mg ($2.00/mg) Strate Labs: $94.95 for 40.1 mg ($2.37/mg) Listings that price by kit, bundle, or unit rather than by weight cannot be normalized to a per-mg basis and are excluded from the figures above. Prices change frequently; the live comparison table on this page reflects the most recent crawl.

Frequently Asked Questions:

Q: What does MOTS-c cost across suppliers tracked by Peptides.SO? A: The platform tracks 138 MOTS-c listings from 98 distinct suppliers, 137 currently in stock. Fifty-six of those normalize to a per-milligram price, with a median of $7.00/mg and a middle-half range of $4.68 to $9.93/mg — a wider spread than most short peptides, reflecting variable synthesis quality for a 16-residue sequence.

Q: Which suppliers currently offer the lowest verified per-mg price? A: NG Peptide at $80.00 for 40 mg and Modern Research Peptides at $60.00 for 30 mg both work out to $2.00/mg, followed by Strate Labs at $94.95 for roughly 40 mg ($2.37/mg). All three are in stock as of the September 2026 crawl.

Q: What makes MOTS-c unusual among research peptides? A: It is not encoded by nuclear DNA. Its sequence comes from a short open reading frame inside the mitochondrial 12S rRNA gene, placing it in the small class of mitochondrial-derived peptides. That origin is what makes it interesting as a candidate retrograde signaling molecule from mitochondrion to nucleus.

Q: What is the primary signaling mechanism under investigation? A: Activation of AMP-activated protein kinase (AMPK), the cell's central energy sensor. Downstream research endpoints include glucose uptake, insulin sensitivity in diet-induced obesity models, exercise-associated metabolic adaptation in skeletal muscle, and ROS management via antioxidant enzyme upregulation.

Q: How does MOTS-c relate to other mitochondrial peptides like humanin and SS-31? A: Humanin shares the mitochondrial-derived origin but arises from the 16S rRNA gene and is studied largely for cytoprotective signaling. SS-31 (elamipretide) is a synthetic tetrapeptide that targets cardiolipin in the inner mitochondrial membrane rather than acting as a signaling molecule, so it addresses a different layer of mitochondrial biology.

Q: Is MOTS-c an endogenous peptide? A: Yes — MOTS-c is encoded in the human mitochondrial genome and found in circulation in human plasma, with levels varying based on exercise, age, and metabolic health status. The synthetic version used for research mirrors this endogenous sequence, which contributes to the rationale for studying it as a physiologically relevant signaling molecule rather than a purely synthetic research tool.

Q: Is MOTS-c approved for human use? A: No. It is offered strictly as research-use-only material for laboratory investigation and carries no regulatory approval for human or veterinary application.

Related Research on Peptides.SO: peptides.so/learn/mots-c-mitochondrial-peptide-metabolic-research peptides.so/peptide/ss-31 peptides.so/peptide/humanin peptides.so/learn/peptide-storage-best-practices peptides.so/compare

Cited Research: 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. PubMed PMID: 25738459. Reynolds JC, Lai RW, Woodhead JST, et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nature Communications. 2021. PubMed PMID: 33473109. Ramanjaneya M, Bettahi I, Jerobin J, et al. Mitochondrial-Derived Peptides Are Down Regulated in Diabetes Subjects. Front Endocrinol. 2019. PubMed PMID: 30914034. Kim SJ, Xiao J, Wan J, et al. Mitochondrially derived peptides as novel regulators of metabolism. Journal of Physiology. 2017. PubMed PMID: 30442768.

For laboratory research only. Not for human or veterinary use, diagnosis, treatment, cure, or prevention of any disease. THIS PRODUCT IS NOT FOR HUMAN CONSUMPTION.