Source comparison
Mechanistic Origins: Mitochondrial Peptide vs Pineal Tetrapeptide
MOTS-C (Mitochondrial Open reading frame of the twelve S rRNA type-c, 16 amino acids, MW ~2174 Da) is encoded in the mitochondrial 12S rRNA gene — making it the only known mitochondria-encoded regulatory peptide with nuclear gene expression targets. Under meta
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- MOTS-C (Mitochondrial Open reading frame of the twelve S rRNA type-c, 16 amino acids, MW ~2174 Da) is encoded in the mitochondrial 12S rRNA gene — making it the only known mitochondria-encoded regulatory peptide with nuclear gene expression targets. Under metabolic stress, MOTS-C is released from mitochondria into the cytoplasm and nucleus, where it activates AMPK by facilitating its phosphorylation at Thr-172 via the AICAR pathway and by directly binding AMPK-β subunit regulatory sites (Kd ~0.8 µM). AMPK activation drives phosphorylation of PGC-1α (Ser-570 dephosphorylation → activation), ACC (acetyl-CoA carboxylase inactivation → fatty acid oxidation), and RAPTOR (mTORC1 suppression → anabolic restraint). Nuclear MOTS-C also directly binds ARE (antioxidant response element) sequences in gene promoters — independent of Nrf2 — regulating a subset of anti-oxidant genes including HMOX1 and SOD2.
- Epitalon (Ala-Glu-Asp-Gly, tetrapeptide, MW ~390 Da) is a synthetic pineal peptide whose primary characterised mechanism is telomerase activation: Epitalon increases TERT (telomerase reverse transcriptase) mRNA expression in aging fibroblasts, lymphocytes and neuronal cells by 1.4–1.8-fold above aged controls, producing measurable telomere lengthening in senescent cell cultures (+0.4–0.8 kb per 10 days of treatment in IMR-90 fibroblasts at passage 35). The upstream signalling involves Epitalon binding to β-tubulin and chromatin-associated proteins, facilitating TERT promoter de-methylation (DNMT3B interaction) — an epigenetic mechanism rather than a direct enzyme activator. Epitalon also restores BMAL1 and CLOCK expression in aged pinealocytes, drives melatonin synthesis (+71% in aged rats), and reduces DNMT3A-mediated hypermethylation of tumour suppressor gene promoters in aged tissues.