What is Semax?
Semax is a synthetic heptapeptide derived from the naturally occurring adrenocorticotropic hormone (ACTH) fragment 4-10 (Met-Glu-His-Phe-Pro-Gly-Pro). Developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, Semax incorporates the Pro-Gly-Pro tripeptide extension at the C-terminus to enhance stability and biological activity.
Originally investigated for its neurological properties, Semax has become one of the most extensively studied neuropeptides, with a broad research profile spanning cognitive function, neuroprotection, neurotrophic factor regulation, and immune modulation.
Mechanism of Action
BDNF and NGF Modulation: Semax significantly upregulates brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) expression. Research has demonstrated 1.5-3x increases in BDNF mRNA in the hippocampus and cortex following Semax administration, with corresponding increases in protein levels.
Melanocortin System: As an ACTH analog, Semax interacts with melanocortin receptors (MC3R and MC4R) in the central nervous system. These receptors modulate synaptic plasticity, learning, memory consolidation, and neuroinflammatory responses.
Dopaminergic and Serotonergic Modulation: Research has shown that Semax influences monoamine neurotransmitter systems, increasing dopamine and serotonin turnover in specific brain regions. These effects contribute to its cognitive-enhancing properties observed in research models.
Gene Expression: Transcriptomic studies have revealed that Semax modulates the expression of hundreds of genes involved in neuroplasticity, immune function, and vascular biology, suggesting a broad molecular mechanism of action.
Key Research Applications
Cognitive Enhancement Research
Semax has been extensively studied in cognitive performance models, demonstrating improvements in learning, memory formation, memory retrieval, and attention. Research in both young and aged animal models has shown consistent nootropic effects.
Neuroprotection Research
Significant research has focused on Semax’s neuroprotective properties in ischemic brain injury models. Studies have demonstrated reduced infarct volume, improved neurological outcomes, and decreased markers of oxidative stress and neuroinflammation following cerebral ischemia.
Neurodevelopmental Research
Research has explored Semax’s effects on neuronal differentiation, axonal growth, and synaptogenesis. Studies using neuronal cell cultures have shown enhanced neurite outgrowth and improved cell survival under stress conditions.
Immune Modulation Research
Studies have revealed that Semax modulates immune function by influencing cytokine expression, immune cell differentiation, and inflammatory responses. This immunomodulatory activity appears to be mediated through both melanocortin receptor-dependent and independent pathways.
Structure and Properties
- Sequence: Met-Glu-His-Phe-Pro-Gly-Pro
- Molecular Weight: ~813.93 Da
- Amino Acid Count: 7 (heptapeptide)
- Parent Molecule: ACTH fragment 4-10
- Storage: Lyophilized at -20°C; reconstituted at 2-8°C
- Solubility: Soluble in sterile water
- Purity: Research-grade typically ?98% by HPLC
Handling and Storage
Store lyophilized Semax at -20°C. Reconstituted solutions should be stored at 2-8°C and used within 14-21 days. Semax is relatively stable in solution but should be protected from light and excessive heat. Standard aseptic technique should be used during reconstitution.
Related Peptides
- KPV – Anti-inflammatory peptide with melanocortin system activity
- BPC-157 – Neuroprotective body protection compound
- GHK-Cu – Copper peptide with neurotrophic properties
Conclusion
Semax stands as one of the most thoroughly researched neuropeptides available, with a unique mechanism spanning neurotrophic factor regulation, melanocortin receptor modulation, and broad gene expression changes. Its consistent cognitive-enhancing and neuroprotective effects in research models make it an invaluable tool for neuroscience research.
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