Humanin
HN / HNG / Humanin G
Humanin is a 24-amino acid mitochondrial-derived peptide (MDP) encoded within the 16S ribosomal RNA gene of mitochondrial DNA, first discovered in 2001 from surviving neurons in Alzheimer's disease brains. It exhibits potent neuroprotective, anti-apoptotic, and cytoprotective properties across multiple organ systems through interactions with IGFBP-3, BAX, and the formyl peptide receptor-like 1 (FPRL1). Research interest has expanded from neurodegeneration to encompass metabolic disease, cardiovascular protection, and aging biology.
Mechanism of Action
Mitochondria-derived micropeptide encoded in the 16S rRNA region. Neuroprotective through binding to IGFBP-3 (blocking apoptosis), activating STAT3 signaling, and modulating BAX-mediated cell death. Also improves insulin sensitivity and reduces amyloid-beta toxicity.
Research Protocols
For research purposes only. Not medical advice.
Research protocols are primarily preclinical. Humanin analogs (HNG, HNGF6A) used at 1-4mg/kg in animal models. Human dosing not established. Intranasal and subcutaneous routes studied.
Research Notes
Clinical Research Status
Humanin remains in the preclinical and early translational research phase, with no completed human clinical trials as of current literature. Observational studies have found that circulating humanin levels decline with age and correlate inversely with markers of cognitive decline and metabolic dysfunction. Several humanin analogs with enhanced potency and stability, particularly HNG (S14G-Humanin), have been developed to overcome the native peptide's short half-life and advance toward clinical testing.
Key Published Findings
The original discovery by Bhimori Hashimoto (2001) demonstrated that humanin specifically protected neurons against amyloid-beta toxicity, presenilin mutant-induced apoptosis, and other Alzheimer's-related insults. Subsequent research revealed humanin acts as an insulin sensitizer, reducing hepatic glucose production and improving glucose tolerance in animal models of diabetes. Studies in cardiovascular models show humanin protects against ischemia-reperfusion injury, reduces atherosclerotic plaque formation, and inhibits vascular smooth muscle cell apoptosis.
Safety Profile
As an endogenously produced peptide, humanin is considered to have a favorable safety profile, though systematic toxicology studies in humans have not been conducted. The primary theoretical concern involves its anti-apoptotic properties potentially interfering with tumor suppression mechanisms, though some evidence suggests it may actually enhance certain anti-cancer immune responses. No significant adverse effects have been reported in animal studies at supraphysiological doses, though long-term exposure data remains limited.
Comparison to Related Compounds
Humanin is the founding member of the mitochondrial-derived peptide family, which also includes MOTS-c (a 16-amino acid exercise mimetic peptide) and the SHLPs (Small Humanin-Like Peptides 1-6). Unlike exogenous neuroprotective peptides such as Cerebrolysin or Semax, humanin represents an endogenous protective signal that declines with mitochondrial aging. The analog HNG is approximately 1000-fold more potent than native humanin, making it more practical for research applications.
Community Observations
Interest in humanin within longevity research communities centers on its role as a biomarker and potential therapeutic for mitochondrial aging. Due to extremely limited commercial availability and the early stage of research, human experimentation outside academic settings is rare. The peptide's connection to centenarian genetics (elevated humanin levels correlate with exceptional longevity) has generated significant interest in the anti-aging research community.
Half-Life
~30-60 minutes
Reconstitution
Sterile saline or bacteriostatic water
Storage
Lyophilized
Store at -20C. Sensitive to freeze-thaw cycles.
Reconstituted
Refrigerate 2-8C. Use within 7 days.
US Legal Status
Also Known As
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