Протеолиз His-Phe-Arg-Trp-Pro-Gly-Pro в крови и мозге крыс in vivo

Andreeva, L. A.; Babakov, Vladimir; Мясоедов, Н.Ф.; Нагаев, И. Ю.; Radilov, A. S.; Shevchenko, V. P.; Шевченко, Константин Валерьевич

doi:10.7868/s0869565215270262

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“…раздел "Заключение") [48]. [49,50] При определении концентрации АКТГ(6-9)PGP в крови после интраназального введения наблюдали максимум общей радиоактивности и меченого АКТГ(6-9)PGP через 120 мин после введения пептида (1,12 пмоль/мл). При этом, исходя из проведённых расчётов, общее содержание АКТГ(6-9)PGP в крови через 120 мин составляло около 0,08% от введенной дозы.…”

Section: исследование устойчивости Pro-gly-pro-leuunclassified

“…При интраназальном способе введения различия в концентрациях пептидов в крови и мозге не столь велики, как при внутривенном способе их введения. Количественная оценка вклада двух возможных путей поступления пептидов в мозг из слизистой носовой полости указывает на соизмеримую роль прямого и опосредованного путей транспорта при интраназальном способе введении [44,49].…”

Section: время минunclassified

“…Сравнение значений кажущегося коэффициента распределения АКТГ(6-9)PGP и Pro-Gly-Pro-Leu для разных органов[24] Орган Kd = C(t) орган /C(t) кровь АКТГ(6-9)PGP Pro-Gly-Pro-Зависимость от времени соотношения АКТГ(6-9)PGP, Phe-Arg-Trp-Pro-Gly-Pro, Trp-Pro-Gly-Pro и His-Phe-Arg-Trp-Pro-Gly в крови крыс (A -при внутривенном введении; B -при интраназальном введении) (за 100% принято общее содержание этих соединений в пробах)[50]. Зависимость содержания в крови крыс Phe-Arg-Trp-Pro-Gly-Pro, Trp-Pro-Gly-Pro и Pro-Gly-Pro от времени после введения АКТГ(6-9)PGP[49]…”

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Stability of prolin-containing peptides in biological media

et al. 2019

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New data on peptide drugs have been summarized; their high stability is due to both the introduction of Pro-Gly-Pro in various amino acid sequences and the modification of the glyproline fragment itself. Pro-Gly-Pro-Leu, ACTH(6-9)Pro-Gly-Pro, 5-oxo-Pro-Arg-Pro and 5-oxo-Pro-His-Pro-NH2 were used as proline-containing peptides. Tritiated peptides were obtained: Pro-Gly-Pro-Leu with specific radioactivity of 135 Ci/mmol, ACTH(6-9)Pro-Gly-Pro – 26 Ci/mmol, 5-oxo-Pro-Arg-Pro – 60 Ci/mmol and 5-oxo-Pro-His-Pro-NH2 – 75 Ci/mmol. The concentration of Pro-Gly-Pro-Leu, ACTH(6-9)Pro-Gly-Pro, 5-oxo-Pro-Arg-Pro and 5-oxo-Pro-His-Pro-NH2 in the blood was found to be about 200 times more than in the brain for intranasal administration, and in average 600 times more for intravenous administration. The stability of proline-containing peptides in vitro experiments was determined using different commercially available peptidases (leucine aminopeptidases, dipeptidases, carboxypeptidases B and Y), and using nasal mucus, microsomal fraction of the rat brain (IMPC) and rat blood plasma. During peptidase hydrolysis of Pro-Gly-Pro-Leu, the main metabolites were Gly-Pro-Leu, Pro-Gly-Pro, Gly-Pro and Pro-Gly. For ACTH(6-9)Pro-Gly-Pro, the main metabolites were Phe-Arg-Trp-Pro-Gly-Pro and Trp-Pro-Gly-Pro. In peptidase hydrolysis of 5-oxo-Pro-His-Pro-NH2, the major metabolite was 5-oxo-Pro-His-Pro. It was shown that with different methods of peptides administration the composition of the metabolites formed is different. Based on the data obtained, resistance to enzymatic cleavage of peptides and their metabolic pathways were evaluated. Thus, these new data have shown that the above approaches can be used to prolong the action of glyprolines in living objects. In this case, the degradation of proline-containing peptides occurs mainly not due to the action of proteases, but due to other ways of degradation. In general, the data presented in the review indicate the promise of intranasal way of introducing biologically active peptides into the brain of living organisms.

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Section: исследование устойчивости Pro-gly-pro-leuunclassified

Section: время минunclassified

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