Source comparison
MOTS-c vs Other Mitochondrial-Derived Peptides: Humanin and SHLP Families
MOTS-c is part of a broader class of mitochondrial-derived peptides (MDPs) that includes humanin and the small humanin-like peptides (SHLPs 1–6). All are encoded within mitochondrial DNA, all translocate to extramitochondrial compartments, and all exert cytopr
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- MOTS-c is part of a broader class of mitochondrial-derived peptides (MDPs) that includes humanin and the small humanin-like peptides (SHLPs 1–6). All are encoded within mitochondrial DNA, all translocate to extramitochondrial compartments, and all exert cytoprotective or metabolic regulatory effects. But their mechanisms and tissue-specific actions differ substantially.
- Humanin, a 24-amino-acid peptide encoded in the mitochondrial 16S rRNA gene, functions primarily as an anti-apoptotic factor. It binds to the pro-apoptotic protein BAX, preventing mitochondrial outer membrane permeabilization and blocking cytochrome c release during cellular stress. Humanin levels are elevated in long-lived individuals and decline sharply in Alzheimer's disease patients. Its metabolic effects are secondary to its cell survival role. It improves insulin sensitivity, but through preventing beta-cell apoptosis in the pancreas rather than directly enhancing skeletal muscle glucose uptake.
- The SHLP family (small humanin-like peptides 1–6) are encoded in adjacent mitochondrial genes and appear to regulate mitochondrial respiration, reactive oxygen species production, and lipid metabolism. SHLP2 and SHLP3 have shown effects on brown adipose tissue thermogenesis and energy expenditure in rodent models, but human data remains limited.
- MOTS-c
- 12S rRNA ORF Type-C
- AMPK activation + nuclear transcription (GLUT4, CPT1 upregulation)
- Insulin sensitization, glucose disposal, fatty acid oxidation
- Human observational: inverse correlation with diabetes risk; rodent RCTs show 30% fasting glucose reduction
- Humanin
- 16S rRNA
- BAX inhibition, anti-apoptotic signaling
- Beta-cell preservation, secondary insulin sensitivity
- Elevated in centenarians; clinical trials in metabolic syndrome show modest HbA1c reduction
- SHLP2
- 16S rRNA (adjacent ORF)
- Mitochondrial uncoupling, thermogenesis
- Increased energy expenditure, cold tolerance
- Rodent data only; human trials pending
- The key distinction: MOTS-c is the only MDP with demonstrated direct transcriptional control over glucose metabolism genes. Humanin protects cells that are already insulin-responsive; MOTS-c makes insulin-resistant cells responsive again.