Semax

Semax and the Blood-Brain BarrierSemax is a synthetic heptapeptide consisting of the amino acid sequence Met-Glu-His-Phe, a partial sequence derived from the naturally occurring adrenocorticotropic hormone (ACTH). This primary sequence is further augmented by appending a Pro-Gly-Pro (PGP) tripeptide at the C-terminal end, a modification hypothesized to potentially increase the molecule's lipophilicity. Enhanced lipophilicity might, in turn, improve the peptide’s capacity for passive diffusion or uptake through the brain's protective blood-brain barrier (BBB). Such facilitation might occur via lipid raft-mediated endocytosis mechanisms, potentially allowing the peptide to bypass the tight junctions that normally impede substances from entering the brain. Additionally, incorporating the PGP sequence at the C-terminus of the peptide is posited to influence its interaction with specific transporters or receptors located on the BBB, which might promote its entry into the brain through receptor-mediated transcytosis. Furthermore, acetylating Semax may confer increased molecular stability, potentially rendering the peptide more resistant to enzymatic degradation. This alteration might result in an extended half-life of Semax within biological systems, allowing for a prolonged period of activity before breakdown occurs.
Semax and StrokeIn Russia, Semax has been researched in the context of acute cerebral hypoxia resulting from stroke or traumatic brain injury. As per studies in murine models, Semax appears to promote the expression of 24 genes in the brain and spinal cord through various molecular mechanisms. These genes are believed to modulate various functions, from smooth muscle cell migration to red blood cell formation and angiogenesis. The peptide has been suggested to promote the survival of neurons and potentially stabilize mitochondria.[1]Scientists report that“The immunomodulating effect of the peptide discovered in our research and its impact on the vascular system during ischemia is likely to be the key mechanisms underlying the neuroprotective effects of the peptide.”[2]Gusev et al. observed,“early rehabilitation and [introduction] of Semax increased BDNF plasma levels, speed functional recovery, and improve motor performance.”BDNF is a naturalbrain peptidethat some researchers believe may aid in cognitive development. There is data to suppose that BDNF stimulation may support neuroplasticity as well.