title: [Semax and selank inhibit the enkephalin-degrading enzymes from human serum]].
abstract: A dose-dependent effect of synthetic heptapeptides Semax (Met-Glu-His-Phe-Pro-Gly-Pro) and Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) on the enkephalin-degrading enzymes of human serum was demonstrated. The inhibitory effects of Semax (IC50 10 microM) and Selank (IC50 20 microM) are more pronounced than those of puromycin (IC50 10 mM), bacitracin, and some other inhibitors of peptidases. Beside the heptapeptides, their pentapeptide fragments also possessed an inhibitory effect; tri-, tetra-, and hexapeptide fragments did not display such an effect. As the above enzymes take part in degradation of not only enkephalins but also other regulatory peptides, it can be assumed that one of the mechanisms of biological activity of Semax and Selank is related to this inhibitory activity of theirs.
authors.affiliation: National Research Center for Mental Health, Russian Academy of Medical Sciences, Zagorodnoe shosse 2/2, Moscow, 113152 Russia. kost@rcmh.msk.ru
authors.forename: N V
authors.initials: NV
authors.lastname: Kost
authors.forename: O Iu
authors.initials: OIu
authors.lastname: Sokolov
authors.forename: M V
authors.initials: MV
authors.lastname: Gabaeva
authors.forename: I A
authors.initials: IA
authors.lastname: Grivennikov
authors.forename: L A
authors.initials: LA
authors.lastname: Andreeva
authors.forename: N F
authors.initials: NF
authors.lastname: Miasoedov
authors.forename: A A
authors.initials: AA
authors.lastname: Zozulia
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000031:analogs & derivatives / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006801:Humans; D015260:Neprilysin / Q000037:antagonists & inhibitors* / Q000097:blood; D009842:Oligopeptides / Q000494:pharmacology; D010446:Peptide Fragments / Q000494:pharmacology*
chemical_list: D004791:Enzyme Inhibitors; D009842:Oligopeptides; D010446:Peptide Fragments; C048487:ACTH (4-7), Pro-Gly-Pro-; D000324:Adrenocorticotropic Hormone; D015260:Neprilysin; C100827:TP 7