The study of the permeability of the blood-brain barrier for new neurotropic peptide drugs

The paper presents the results of studies of penetration through the hemato-encephalic barrier (BBB) of rats of three new peptide drugs -modified analogues of endogenous neuropeptides and their active metabolites created in the research Zakusov institute of Pharmacology. Discussed the main physical-chemical characteristics of study dipeptides which allow predicting the penetration of peptide compounds through the BBB. All three of the studied compounds: noopept is a peptide analog of piracetam (ethyl ether N-phenylacetyl-L-prolyl-L-glycine) with nootropic and neuroprotective activity, dilept - analoge of neurotensin (methyl ether of N-caproyl-L-prolyl-L-tyrosine) - antipsychotic wich positive mnemotropic effect and the compound GB-115 (amide N-hexanoyl-L-glycyl-L-tryptophan) - retroanaloge of cholecystokinin-4 is a selective anxiolytic with anti-alcohol effect. In experiments on rats using the method of HPLC-MS/MS was shown that noopept and its metabolite cyclo-prolyl-L-glycine (CPG) are found in brain of rats after oral administration of the substance drugs, which indicates their penetration through the BBB with coefficients K_brain/plasma 1.61 and 1.38, respectively; Dilept and its active metabolite M1, are detected in the brain of rats, which indicates the penetration of both compounds through the BBB with the coefficients the brain/plasma for dilept 2.0 and metabolite-0.5, that indicated on different mechanism of transport these compounds trough the BBB. It is shown that the anxiolytic GB-115 also penetrates through the BBB with a high coefficient K_brain/plasma - 1.41. Thus, all three dipeptide analogues of natural neuropeptides penetrate the BBB, have a high tropicity to the brain tissue of rats, which may indicate their direct influence on the brain structures involved in the realization of pharmacological effects of these drugs.

модифицированные аналоги природных нейропептидов, проникание через ГЭБ, фармакокинетические параметры, коэффициент распределения Кмозг/плазма, modified analogues of natural neuropeptides, the penetration through the BBB, pharmacokinetic parameters, the distribution coefficient

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