MOTS-c (Mitochondrial Open Reading Frame of the 12S rRNA Type-c) is a naturally occurring 16-amino-acid mitochondrial-derived peptide (MDP) encoded within mitochondrial DNA.

Unlike most peptides, which are encoded by nuclear DNA, MOTS-c originates from a small open-reading frame within the mitochondrial 12S rRNA (MT-RNR1) region. This unusual origin has made MOTS-c an important research target in the fields of mitochondrial signalling, cellular energy metabolism, insulin sensitivity, exercise physiology and ageing.

Key Research Areas

Mitochondrial & Cellular Energy Research
MOTS-c is being investigated as a signalling molecule that allows mitochondria to communicate with the rest of the cell. Under metabolic stress, MOTS-c can translocate to the nucleus and influence expression of genes associated with metabolic adaptation and cellular stress resistance.

Glucose Metabolism & Insulin Sensitivity
Some of the strongest early MOTS-c research involves glucose metabolism. Experimental studies found that MOTS-c increased cellular glucose utilisation and improved skeletal-muscle insulin sensitivity in mice. It also protected mice against high-fat-diet-induced insulin resistance and excessive weight gain.

AMPK & Metabolic Signalling
A major focus of MOTS-c research is AMP-activated protein kinase (AMPK), one of the body’s primary cellular energy sensors.

Research indicates that MOTS-c influences the folate cycle and purine biosynthesis, increasing AICAR and subsequently activating AMPK.

Exercise & Performance Research
MOTS-c has generated considerable interest in exercise physiology. Animal research has demonstrated improvements in exercise capacity and metabolic adaptation following MOTS-c treatment.

Human studies have also investigated how naturally occurring MOTS-c responds to exercise. Research indicates that acute exercise can alter mitochondrial-derived peptide concentrations, although responses vary with exercise type and other factors.

Skeletal Muscle Research
Skeletal muscle appears to be an important target of MOTS-c signalling. Experimental research has investigated its effects on glucose uptake, GLUT4 expression, AMPK activation, insulin sensitivity and muscle metabolic function.

Metabolic & Body-Composition Research
MOTS-c has been studied in animal models involving obesity, insulin resistance and metabolic dysfunction. Early experiments demonstrated protection against diet-induced obesity and improvements in metabolic homeostasis. These findings are predominantly preclinical and should not be interpreted as evidence that MOTS-c is an established human weight-loss treatment.

Ageing & Longevity Research
MOTS-c is also being investigated in the biology of ageing. Research has explored age-associated changes in MOTS-c signalling and its potential involvement in metabolic resilience, mitochondrial function, muscle performance and cellular stress responses.

How MOTS-c Is Being Studied

One proposed pathway is:

MOTS-c → Folate/Purine Metabolism → AICAR → AMPK Activation → Metabolic & Cellular Adaptation

During cellular stress, MOTS-c can also move into the nucleus, where research indicates that it interacts with transcription factors including NRF2 and influences genes containing antioxidant response elements.

Research surrounding MOTS-c therefore includes:

• Mitochondrial-to-nuclear signalling
• AMPK activation
• Glucose utilisation
• Insulin sensitivity
• Skeletal-muscle metabolism
• Exercise adaptation
• Cellular stress resistance
• Oxidative-stress pathways
• Metabolic ageing