MOTS-c: The Mitochondrial Peptide at the Frontier of Longevity Research

MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA-c) is a 16-amino acid peptide encoded within the mitochondrial genome — specifically within the 12S ribosomal RNA gene. This makes it the only known peptide of mitochondrial origin, a distinction that has generated significant scientific interest since its discovery in 2015 by Dr. Changhan David Lee at USC.

Why Mitochondrial Origin Matters

Human cells contain two genomes: the nuclear genome (in the cell nucleus) and the mitochondrial genome (in the mitochondria). The mitochondrial genome is ancient, small (only ~37 genes), and was long thought to encode only components of the mitochondrial machinery. MOTS-c's discovery challenged that assumption and opened a new class of signalling molecules called mitochondria-derived peptides (MDPs).

MOTS-c translocates from the mitochondria to the cytoplasm and nucleus, where it functions as a metabolic regulator — particularly under conditions of stress.

Key Research Findings

Metabolic Regulation

MOTS-c activates AMPK (AMP-activated protein kinase), the master energy sensor of the cell. AMPK activation:

• ·Enhances glucose uptake in skeletal muscle
• ·Promotes fatty acid oxidation
• ·Suppresses hepatic glucose production
• ·Mimics several of the metabolic effects of exercise

A landmark 2015 paper in Cell Metabolism showed MOTS-c improved insulin sensitivity and reduced diet-induced obesity in mouse models when administered exogenously.

Exercise Mimicry

MOTS-c levels rise in humans during exercise. Injecting MOTS-c into sedentary mice improved their treadmill performance — suggesting it contributes to exercise-induced metabolic adaptation. Researchers are studying whether MOTS-c could offset age-related declines in exercise capacity.

Ageing and Longevity

MOTS-c levels decline with age in humans. A 2019 study found that centenarians and their offspring have higher circulating MOTS-c levels compared to age-matched controls, suggesting a link between MOTS-c and exceptional longevity. MOTS-c extends lifespan in aged mouse models.

Skeletal Muscle and Bone

Recent research has identified MOTS-c receptors in both skeletal muscle and bone cells. Studies demonstrate:

• ·Improved muscle mass preservation under caloric restriction
• ·Potential bone density maintenance through osteoblast support

Circadian and Stress-Responsive Behaviour

Unlike most peptides, MOTS-c expression fluctuates throughout the day and responds to metabolic stress. Fasting, exercise, and caloric restriction all increase endogenous MOTS-c production. This makes it an interesting subject for circadian biology research.

Research Protocol

MOTS-c is typically studied via subcutaneous injection given its small size (1,700 Da) and peptide nature. Research doses in published animal studies have been in the 5–15 mg/kg range. View the MOTS-c Research Protocol for reconstitution guidance and dosing tables. Shop MOTS-c or explore the Longevity Protocol for a combined approach with GHK-Cu and other longevity peptides.

Note: MOTS-c is sold by JA Performance strictly for laboratory and in vitro research use. Not for human consumption.