Description
Humanin is a 21-amino-acid mitochondrial-derived peptide (MDP) encoded within the 16S rRNA region of the mitochondrial genome — the first of its kind ever identified. Its discovery fundamentally expanded the understood role of mitochondria from purely metabolic organelles to active sources of signaling peptides that influence cell survival under stress conditions. Humanin is studied for its cytoprotective and anti-apoptotic properties across multiple cell types, acting both intracellularly through JAK/STAT signaling and BCL-2 family protein interactions, and extracellularly through the FPR2 membrane receptor in autocrine, paracrine, and endocrine signaling contexts. Researchers working across mitochondrial and cellular peptide biology use Humanin specifically in models examining stress-induced apoptosis and cytoprotective signaling pathways.
Key Characteristics
- First mitochondrial-derived peptide (MDP) discovered — its identification established the principle that the mitochondrial genome encodes functional bioactive peptides beyond the 13 canonical proteins, opening a research field that now includes MOTS-c, SHLP1–6, and other MDPs
- Dual signaling mode — Humanin acts intracellularly by binding BAX and tBID to inhibit mitochondrial apoptosis initiation, and extracellularly through FPR2 receptor binding that enables autocrine, paracrine, and endocrine cytoprotective signaling across cell populations
- Unlike MOTS-c, which targets metabolic adaptation through AMPK activation and nuclear translocation, Humanin’s primary research focus is anti-apoptotic pathway inhibition and cellular stress resistance — two MDPs from the same genome addressing mechanistically distinct biological questions
- JAK/STAT pathway engagement downstream of FPR2 binding connects Humanin research to immune signaling and inflammatory response biology, extending its research relevance beyond its original cytoprotection context
- Circulating Humanin levels decline with age in preclinical and human studies, and its expression is upregulated in response to cellular stress — making it a relevant biomarker variable in aging biology research alongside its use as an exogenous research tool
Handling and Storage
Store as lyophilized powder under refrigeration, away from heat, moisture, and light. Reconstitute immediately before use and avoid repeated freeze-thaw cycles to maintain peptide integrity and cytoprotective bioactivity across experimental batches.
FAQs
What is Humanin?
Humanin is a 21-amino-acid peptide encoded in the mitochondrial genome — specifically within the 16S rRNA region — and the first mitochondrial-derived peptide (MDP) to be identified. It is studied for cytoprotective and anti-apoptotic signaling through intracellular BAX/BCL-2 pathway interaction and extracellular FPR2 receptor binding. Its discovery established that the mitochondrial genome actively produces functional bioactive signaling peptides.
How does Humanin differ from MOTS-c in mitochondrial peptide research?
Both are mitochondrial-derived peptides encoded within the mitochondrial genome, but they address different biological questions. Humanin is studied for cytoprotective and anti-apoptotic signaling — inhibiting apoptosis initiation through BAX and tBID binding and activating cell survival pathways via FPR2 and JAK/STAT. MOTS-c is studied for metabolic adaptation — it translocates to the nucleus under stress and activates AMPK-mediated energy regulation. Researchers select between them based on whether the study addresses cellular stress survival or metabolic homeostasis.
What research contexts make Humanin most relevant as an experimental tool?
Humanin is most studied in models examining stress-induced apoptosis, oxidative stress response, and mitochondrial dysfunction across neuronal, cardiovascular, and metabolic cell populations. Its dual intracellular and extracellular signaling modes also make it relevant in cancer biology research — its cytoprotective FPR2 signaling has been studied in the context of chemoresistance in tumor cell models, where upregulated Humanin expression represents a mechanism of cell survival under cytotoxic challenge.
