SEMAX

Description

Semax Peptide
Semax peptide is a synthetic polypeptide analog of an adrenocorticotropic hormone fragment 4-7 (ACTH 4-7),(1) a hormone secreted by the anterior pituitary gland. This fragment has been reported by researchers not to exhibit any action characteristic of ACTH itself but may have a potentially specific action within the brain.(2)
Researchers find that naturally occurring peptides may occasionally exhibit instability and easy degradation by biological enzymes, such as those found in gastrointestinal and cerebrospinal fluids. Consequently, researchers aim to synthesize analogs of these naturally occurring but potentially unstable peptides to induce similar biological action with the added value of higher stability. Semax is one such synthetically developed derivative of an endogenous adrenocorticotropic hormone fragment. The Met-Glu-His-Phe sequence in Semax is extended by adding a Pro-Gly-Pro (PGP) sequence at its C-terminal end. This modification with PGP may potentially enhance the molecule’s ability to cross the blood-brain barrier (BBB) by increasing its lipophilicity. This increase in lipophilicity may facilitate the molecule’s passive diffusion or uptake through mechanisms such as lipid raft-mediated endocytosis, which may circumvent the tight junctions that typically restrict entry into the brain. Furthermore, the presence of PGP at the peptide’s C-terminus might also modify its interactions with specific transporters or receptors on the BBB, potentially favoring its transport via receptor-mediated transcytosis. Moreover, the acetylation of Semax may improve its stability by making it more resistant to enzymatic breakdown, thereby extending its half-life in biological settings.