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• W2050670325 abstract "FUNDAMENTO: A caracterização de uma enzima conversora de angiotensina (ECA) no líquido pericárdico humano é relevante diante do seu papel na liberação de angiotensina II e, portanto, do papel do pericárdio na homeostase cardivascular. OBJETIVO: Isolar e caracterizar uma ECA do líquido pericárdico humano. Comparar as atividades conversoras de angiotensina I do fluido pericárdico e do soro de pacientes submetidos à cirurgia cardiovascular. MÉTODOS: A enzima do líquido pericárdico humano foi purificada por meio de etapas cromatográficas e caracterizada por eletroforese em gel de poliacrilamida (SDS-PAGE), hidrólise de angiotensina I, bradicinina, Hip-His-Leu e substratos sintéticos com supressão interna de fluorescência. Lisinopril foi usado como inibidor. A atividade de ECA foi determinada em amostras de sangue e líquido pericárdico de 23 pacientes submetidos à cirurgia cardiovascular. RESULTADOS: A ECA purificada (MM = 140 kDa) libera angiotensina II, hidrolisa a bradicinina e o substrato Hip-His-Leu. Os parâmetros cinéticos k cat,(s-1) e k cat/Km (µM-1. s-1) foram respectivamente: Hip-His-Leu (1,14 e 7 x 10 -4), Abz-YRK(Dnp)P-OH (2,60 e 0,77), Abz-LFK(Dnp)-OH (2,77 e 0,36) e Abz-SDK(Dnp)P-OH (1,92 e 0,19). As atividades conversoras de angiotensina I (média ± DP) do líquido pericárdico e no soro foram, respectivamente, 3,16 ± 0,90 mU x mg -1x min-1 e 0,33 ± 0,11 mU x mg -1x min-1 . A diferença foi significativa entre os dois fluidos. CONCLUSÃO: Uma ECA com grande similaridade com a enzima somática foi isolada do fluido pericárdico humano. A atividade conversora de angiotensina I é maior no líquido pericárdico quando comparada com a atividade do soro. Esses dados constituem importante evidência do papel do líquido pericárdico no metabolismo de peptídeos ativos." @default.
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• W2050670325 date "2008-09-01" @default.
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• W2050670325 title "Enzima conversora de angiotensina no líquido pericárdico: estudo comparativo com a atividade sérica" @default.
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• W2050670325 doi "https://doi.org/10.1590/s0066-782x2008001500006" @default.
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