MOTS-c vs Epithalon

MOTS-c (Mitochondrial-derived Open reading frame within 12S rRNA, type c) is a 16-amino acid peptide encoded within the 12S rRNA gene of the mitochondrial genome, a unique position for a signaling peptide. Identified by Lee et al. in 2015, MOTS-c is produced in the mitochondria and translocated to the nucleus under metabolic stress conditions, where it functions as a retrograde signal linking mitochondrial status to nuclear gene expression. Its primary documented signaling pathway involves AMPK activation through an AICAR-related metabolic intermediate, promoting glucose uptake, mitochondrial fatty acid oxidation, and metabolic flexibility. MOTS-c plasma levels decline with age and are reduced in metabolically dysfunctional states, supporting its consideration as a longevity-relevant biomarker.

Epithalon (Ala-Glu-Asp-Gly) is a synthetic tetrapeptide developed by the Khavinson group as a functional analog of Epithalamin, a polypeptide derived from bovine pineal gland tissue. Its primary research mechanism is telomerase activation, specifically the induction of hTERT expression in somatic cells that normally have low telomerase activity. Telomere shortening is a fundamental driver of cellular senescence and is considered one of the primary hallmarks of biological aging. In cell culture experiments, Epithalon treatment has been reported to extend the number of cell divisions beyond the standard Hayflick limit and to elongate telomeres as measured by telomere length assays. Animal studies have additionally documented effects on immune cell aging, melatonin secretion, and tissue aging markers across multiple organ systems.