Aryl Acetylenes as Mechanism-Based Inhibitors of Cytochrome P450-Dependent Monooxygenase Enzymes
作者:Maryam Foroozesh、Ginny Primrose、Zuyu Guo、L. Chastine Bell、William L. Alworth、F. Peter Guengerich
DOI:10.1021/tx960064g
日期:1997.1.1
methylene groups are selective inhibitors of P450 2B1/2B2 in liver microsomes from rats. Aryl acetylenes also act as suicide inhibitors of P450 1A2 in human liver microsomes, of purified P450 1A2 from rabbit or rat liver in reconstituted systems, and of purified recombinant human P450 1A2 and 1A1 in reconstituted systems. 4-(1-Propynyl)biphenyl (4PBi) inactivated P450 1A2-dependent ethoxyresourfin deethylation
已经研究了芳基乙炔在从暴露于β-萘黄酮,异黄酮或苯巴比妥的大鼠制备的肝微粒体中作为细胞色素P450(P450)依赖性烷氧基间苯二酚脱烷基化脱烷基活性的抑制剂。研究的许多乙炔会产生假一阶时间依赖性和NADPH依赖性的脱烷基活性损失,这些是基于机制的不可逆失活(自杀抑制)的特征。用甲基取代芳基乙炔的末端氢以将乙炔转化为丙炔,可以增强对P450 1A酶的抑制作用。在某些情况下,这种修饰将可逆的P450抑制剂转化为自杀抑制剂。相反,乙炔比相应的丙炔更有效地抑制P450 2B依赖性脱烷基的自杀。在大鼠肝微粒体内,在萘2位或菲9位上具有乙炔基的芳基乙炔和具有2、3或4个亚甲基烷基链的芳基烷基乙炔是P450 2B1 / 2B2的选择性抑制剂。芳基乙炔还充当人肝微粒体中P450 1A2的自杀抑制剂,重组系统中来自兔或大鼠肝脏的纯化P450 1A2的自杀抑制剂以及重组系统中纯化的重组人P450 1A2和1A