Humanin

Overview

Humanin was the first mitochondria-derived peptide (MDP) discovered, originally cloned from the occipital lobe of an Alzheimer’s patient. It is a 24-amino acid peptide encoded from the 16S rRNA region of mitochondrial DNA with potent neuroprotective, cytoprotective, and anti-apoptotic properties. Research shows humanin levels decline with age but remain stable in long-lived species like naked mole-rats, and offspring of centenarians have significantly higher humanin levels.

Mechanism of action

Humanin exerts its effects through multiple mechanisms. It interacts with cell surface receptors including FPRL1 and CNTFR, activating PI3K/AKT signaling pathways that promote cell survival. It blocks pro-apoptotic proteins like Bax, reduces beta-amyloid toxicity in neurons, protects against oxidative stress, and promotes mitochondrial biogenesis. These actions support healthy cellular aging at a fundamental level.

Key research findings

• Potent neuroprotection against Alzheimer’s and Parkinson’s pathology
• Extended lifespan in animal models (C. elegans)
• Improved metabolic healthspan parameters
• Reduced inflammatory markers
• Cytoprotective effects across multiple cell types
• Anti-apoptotic activity
• Mitochondrial optimization and biogenesis
• Protection against oxidative stress

Research applications

Neuroprotection

• Alzheimer’s Disease Protection — Originally discovered for its ability to protect against amyloid-β toxicity in neuronal cells.
• Parkinson’s Disease Support — Promotes mitochondrial biogenesis via PI3K/AKT signaling in PD models.
• General Neuroprotection — Broad neuroprotective effects against various neurotoxic insults.

Longevity

• Lifespan Extension — Overexpression increases lifespan in C. elegans, dependent on daf-16/Foxo pathway.
• Healthspan Improvement — HNG analog improves metabolic healthspan parameters in middle-aged mice.
• Anti-Aging — Higher levels associated with longevity in centenarians and their offspring.

Cellular Protection

• Cytoprotection — Protects various cell types from stress-induced damage and death.
• Anti-Apoptosis — Blocks pro-apoptotic proteins like Bax to prevent programmed cell death.
• Mitochondrial Support — Promotes mitochondrial function and biogenesis.