title: [Kinetics of Semax penetration into the brain and blood of rats after its intranasal administration].
abstract: The radioactive peptide analogue Semax corresponding to the ACTH(4-10) sequence (Met-Glu-His-Phe-Pro-Gly-Pro) with a molar radioactivity of 56 Ci/mmol labeled with tritium at the C-terminal Pro was prepared. The labeled peptide was used for studying the kinetics of Semax penetration into rat brain and blood after its intranasal administration (50 microg/kg, 20 microl of solution) to nonbred white rats of body mass 200-250 g. It was demonstrated that 0.093% of the total introduced radioactivity per gram can be found in the rat brain 2 min after the administration, 80% of this radioactivity belonged to Semax, and the rest, to its metabolites. The peptide undergoes rapid enzymatic degradation, with the tripeptide Pro-Gly-Pro prevailing in biological samples relative to the total content of Semax and its metabolites.
authors.forename: K V
authors.initials: KV
authors.lastname: Shevchenko
authors.forename: I Iu
authors.initials: IIu
authors.lastname: Nagaev
authors.forename: L Iu
authors.initials: LIu
authors.lastname: Alfeeva
authors.forename: L A
authors.initials: LA
authors.lastname: Andreeva
authors.forename: A A
authors.initials: AA
authors.lastname: Kamenskiĭ
authors.forename: N G
authors.initials: NG
authors.lastname: Levitskaia
authors.forename: V P
authors.initials: VP
authors.lastname: Shevchenko
authors.forename: I A
authors.initials: IA
authors.lastname: Grivennikov
authors.forename: N F
authors.initials: NF
authors.lastname: Miasoedov
mesh_terms: D000281:Administration, Intranasal; D000324:Adrenocorticotropic Hormone / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000493:pharmacokinetics; D000818:Animals; D001923:Brain Chemistry / Q000187:drug effects*; D008297:Male; D018696:Neuroprotective Agents / Q000008:administration & dosage / Q000138:chemical synthesis / Q000493:pharmacokinetics*; D010446:Peptide Fragments / Q000008:administration & dosage / Q000138:chemical synthesis / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors
chemical_list: D018696:Neuroprotective Agents; D010446:Peptide Fragments; C048487:ACTH (4-7), Pro-Gly-Pro-; D000324:Adrenocorticotropic Hormone