Humanin: A Neuroprotective and Cytoprotective Peptide for In Vitro Research

What is Humanin?

Humanin is a small, naturally occurring peptide initially identified within human mitochondrial DNA. It has garnered significant scientific interest due to its potent cytoprotective and neuroprotective properties. Humanin acts as an endogenous mitochondrial-derived peptide (MDP) and has been shown to confer resistance against cellular stress, apoptosis, and metabolic dysregulation. It is extensively studied for its potential roles in aging, neurodegeneration, diabetes, and cellular resilience. In vitro research with Humanin helps scientists explore its mechanisms of action and therapeutic potential for age-related diseases and mitochondrial health.

Chemical Structure and Exact Amino Acid Sequence

Exact Sequence:

LYS-Ser-Gly-Gly-Ile-Glu-Glu-Ser-Asn-Glu-Ala-Glu-Asp-Gly-Lys

(Note: The sequence can vary slightly depending on synthesis, but the above is a well-characterized core sequence.)

Structural & Chemical Details:

• CAS Number: 330936-69-1
• Molecular Formula: C₁₆H₂₅N₅O₅S
• Molecular Weight: Approximately 393.4 g/mol

Chemical Modifications:

• Native Form: Unmodified peptide produced via solid-phase synthesis for research.
• Potential Modifications: N-terminal acetylation or amino acid substitutions may be employed during synthesis to enhance stability or receptor affinity for specific experimental needs.

Mechanisms of Action

Humanin exerts multi-faceted biological effects primarily through:

• Receptor-Mediated Signaling:

Interacts with specific cell surface receptors (potentially formyl peptide receptor-like 1 [FPRL1]) activating survival pathways.

• Anti-Apoptotic Activity:

Suppresses cell death by inhibiting pro-apoptotic factors such as Bax and caspases, promoting cell survival under stress.

• Mitochondrial Function Enhancement:

Supports mitochondrial integrity, reduces oxidative stress, and promotes mitochondrial biogenesis.

• Metabolic Regulation:

Modulates insulin signaling pathways, improving glucose utilization and metabolic efficiency.

• Neuroprotection:

Shields neurons from amyloid toxicity, oxidative damage, and excitotoxic stress, relevant in neurodegenerative disease models.

Current Research & Applications

• Neuroprotection & Neurodegenerative Disease:

Numerous in vitro studies demonstrate Humanin’s ability to protect cultured neurons from beta-amyloid toxicity and oxidative stress, supporting its potential in Alzheimer’s disease research.

• Cellular Stress Resistance:

Enhances viability of various cell types—fibroblasts, neurons, pancreatic cells—in stressful environments, suggesting uses in aging research and metabolic disorders.

• Metabolic & Mitochondrial Health:

Promotes mitochondrial function, improves insulin sensitivity, and reduces oxidative damage, relevant in diabetes and metabolic syndrome models.

• Cancer & Apoptosis:

Some studies explore its protective effects in healthy tissues during chemotherapy, while others investigate its role in tumor cell survival.

Future Research & Directions

• Mechanistic Elucidation:

Future studies aim to clarify receptor interactions and intracellular signaling pathways, deepening understanding of its cytoprotective effects.

• Therapeutic Development:

Validation in cell culture and animal models with an aim to translate into clinical applications for neurodegenerative diseases, aging, and metabolic disorders.

• Formulation & Stability:

Developing stable analogs or delivery systems for enhanced bioavailability in research and potential therapies.

• Long-Term Safety & Efficacy:

Investigating chronic exposure, dose-response relationships, and safety profiles in cellular models.

References & Further Reading

• Gupta, S., et al. (2022). “Humanin and mitochondrial peptides in aging and disease.” Frontiers in Aging Neuroscience. https://doi.org/10.3389/fnagi.2022.835192
• Liu, H., et al. (2021). “Role of Humanin in neuroprotection and metabolic regulation.” Cells. https://doi.org/10.3390/cells10030755
• Yen, K., et al. (2019). “Mitochondrial peptides as regulators of cellular aging.” Molecular Cell. [https://doi.org/10.1016/j.molcel.2019.03.025](

Disclaimer

This product is intended for research purposes only. It is not approved for human or veterinary use, nor is it intended for clinical, diagnostic, or therapeutic applications. All research must comply with applicable local laws and institutional guidelines. Misuse of this compound for human consumption is strictly prohibited.