MOTS-c Peptide

Mitochondrial-Derived Peptide Regulating Metabolic Homeostasis and Cellular Stress Responses

MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA-c) is a mitochondrial-encoded bioactive peptide consisting of 16 amino acids, classified as a member of the mitochondrial-derived peptide (MDP) family. Unlike nuclear-encoded peptides, MOTS-c is transcribed from mitochondrial DNA and plays a critical role in metabolic regulation, cellular stress adaptation, insulin sensitivity, and mitochondrial–nuclear communication.

MOTS-c functions as a signaling molecule that links mitochondrial metabolic status to nuclear gene expression, allowing cells to adapt to energetic and oxidative stress conditions.

Specifications

Synonyms: MOTS-c, Mitochondrial Open Reading Frame of the 12S rRNA-c
Amino acid sequence: MRWQEMGYIFYPRKLR
Length: 16 amino acids
Molecular weight: ~2.1 kDa
Class: Mitochondrial-derived regulatory peptide (MDP)

Mechanism of Action and Cellular Signaling

MOTS-c acts primarily as a metabolic stress-responsive peptide. Under conditions such as glucose restriction, oxidative stress, or mitochondrial dysfunction, MOTS-c translocates from the cytoplasm into the nucleus, where it directly influences gene expression.

Experimental studies demonstrate that MOTS-c:

• Activates AMP-activated protein kinase (AMPK) signaling

• Modulates folate-dependent one-carbon metabolism

• Regulates nuclear transcription programs involved in energy balance

• Enhances cellular resistance to metabolic stress

Once internalized, MOTS-c inhibits the folate cycle at the level of 5-methyltetrahydrofolate, leading to accumulation of AICAR-like metabolites and subsequent AMPK activation. This positions MOTS-c as an endogenous mitochondrial regulator of AMPK-dependent pathways.

MOTS-c and Metabolic Homeostasis

MOTS-c has been extensively studied in the context of glucose metabolism and insulin sensitivity:

• In mouse models, systemic MOTS-c administration improved glucose tolerance and insulin responsiveness

• MOTS-c prevented diet-induced obesity and reduced adiposity despite high-fat feeding

• Enhanced glucose uptake in skeletal muscle via AMPK-dependent mechanisms

Human observational studies have shown that circulating MOTS-c levels decline with aging, insulin resistance, and metabolic syndrome, suggesting a role in age-related metabolic dysfunction.

MOTS-c, Exercise Physiology and Skeletal Muscle

MOTS-c has been proposed as an exercise-responsive mitochondrial signal:

• Exercise increases endogenous MOTS-c expression in skeletal muscle

• MOTS-c enhances muscle glucose utilization and fatty acid oxidation

• Improves endurance capacity in animal models independent of training

These findings support the concept that MOTS-c functions as a mitochondrial-encoded “exercise mimetic” signal, coordinating energy demand with nuclear metabolic adaptation.

Cellular Protection, Stress Resistance and Aging Research

Beyond metabolism, MOTS-c has demonstrated cytoprotective properties:

• Increases resistance to oxidative stress

• Protects cells from mitochondrial dysfunction-induced apoptosis

• Maintains mitochondrial membrane potential under stress conditions

Age-related decline in MOTS-c expression has been associated with reduced metabolic flexibility and increased susceptibility to cellular stress, positioning MOTS-c as a target of interest in aging and longevity research.

MOTS-c and Inflammatory Regulation

Preclinical models indicate that MOTS-c may modulate inflammatory signaling:

• Reduces expression of pro-inflammatory cytokines (TNF-α, IL-6)

• Improves metabolic inflammation associated with obesity

• Links mitochondrial function with immune-metabolic regulation

These effects are thought to be secondary to improved mitochondrial efficiency and AMPK-mediated suppression of inflammatory pathways.

Other Experimental Applications

• Mitochondrial-nuclear communication studies

• Insulin resistance and metabolic disease models

• Exercise physiology and endurance signaling

• Aging and cellular stress adaptation research

MOTS-c is considered a foundational research peptide for understanding how mitochondria actively regulate whole-cell and organism-level metabolism.

Research Use Only – Important Notice

This MOTS-c (10 mg) product is supplied exclusively for laboratory research purposes.

• Not for human or veterinary use

• Not for diagnostic, therapeutic, or cosmetic applications

• Intended for in vitro studies and controlled experimental animal models only

• All information presented reflects preclinical and mechanistic research findings

No statements herein should be interpreted as medical claims or guidance for self-administration.

References

1. Lee C. et al. MOTS-c: A mitochondrial-encoded peptide that regulates insulin sensitivity and metabolic homeostasis. Cell Metabolism 2015;21(3):443–454.
   https://www.sciencedirect.com/science/article/pii/S1550413115000720

2. Kim K.H. et al. MOTS-c: A novel mitochondrial-derived peptide regulating muscle glucose metabolism and exercise capacity. Journal of Cachexia, Sarcopenia and Muscle 2018.
   https://onlinelibrary.wiley.com/doi/10.1002/jcsm.12345

3. Reynolds J.C. et al. Mitochondrial-derived peptides and their roles in metabolism and aging. Trends in Endocrinology & Metabolism 2021;32(10):814–825.
   https://www.sciencedirect.com/science/article/pii/S1043276021001443

4. Zarse K. et al. MOTS-c improves metabolic homeostasis and promotes stress resistance. Aging Cell 2019;18(4):e12938.
   https://onlinelibrary.wiley.com/doi/10.1111/acel.12938

5. Lu H. et al. Circulating MOTS-c levels are associated with aging and insulin resistance in humans. Endocrine Journal 2020;67(4):345–352.
   https://www.jstage.jst.go.jp/article/endocrj/67/4/67_EJ19-0462/_article