MOTS-c

Overview

MOTS-c belongs to a small class of "mitochondrial-derived peptides" — encoded by mitochondrial DNA rather than the cell's nuclear genome, a genuinely distinct category from most peptides discussed on this site. It's produced naturally in skeletal muscle and increases with exercise, which has driven substantial research interest in its role in metabolic adaptation.

Proposed Mechanism of Action

MOTS-c is proposed to act on skeletal muscle glucose metabolism, and is linked to "mitohormesis" — the concept that mild mitochondrial stress (such as that induced by exercise) triggers adaptive, beneficial signaling responses. Research described in the cited review associates MOTS-c with improved glucose handling and enhanced metabolic response to exercise in animal models.

Research Context

The cited review, from researchers at the USC Leonard Davis School of Gerontology (a lab central to the discovery and characterization of mitochondrial-derived peptides), summarizes the mechanistic case for MOTS-c as a metabolic signaling molecule connecting mitochondrial function to whole-body glucose and fat metabolism, with particular relevance to exercise physiology, obesity, and aging research.

Limitations of the Current Evidence

• The cited source is a review synthesizing mechanistic and animal evidence, not a single human clinical trial — MOTS-c's discovery is relatively recent (first described around 2015), and the evidence base is still maturing.
• Much of the human-relevant data referenced in the broader MOTS-c literature involves measuring naturally occurring MOTS-c levels in response to exercise, which is different from evidence about the effects of exogenously administered MOTS-c — worth distinguishing when you read dosing claims elsewhere.