Inhibition of Extrahepatic Human Cytochromes P450 1A1 and 1B1 by Metabolism of Isoflavones Found in <i>Trifolium pratense</i> (Red Clover)
作者:Dean W. Roberts、Daniel R. Doerge、Mona I. Churchwell、Gonçalo Gamboa da Costa、M. Matilde Marques、William H. Tolleson
DOI:10.1021/jf049418x
日期:2004.10.1
Biochanin A and formononetin are the predominant isoflavones in red clover. In a previous study (J. Agric. Food Chem. 2002, 50, 4783-4790), it was demonstrated that human liver microsomes converted biochanin A and formononetin to genistein and daidzein. This paper now shows CYP1B1-catalyzed O-demethylation of biochanin A and formononetin to produce genistein and daidzein, respectively, which inhibit
红三叶草中主要的异黄酮是Biochanin A和formononetin。在先前的研究中(J. Agric。Food Chem。2002,50,4783-4790),已证明人肝微粒体将生物素A和formononetin转化为染料木黄酮和黄豆苷元。现在,本文显示了CYP1B1催化的生物素A和formononetin的O-去甲基化分别产生染料木黄酮和黄豆苷元,它们分别抑制CYP1B1。将重组人CYP1A1或CYP1B1与biochanin A或formononetin一起孵育。CYP1A1催化异黄酮4'-O-去甲基化和羟基化的效率相似,而CYP1B1则比羟基化更倾向于4'-O-去甲基化。三种生物chanin A代谢产物(5,7,3'-三羟基-4'-甲氧基异黄酮,5,7,8-三羟基-4'-甲氧基异黄酮和5,6,7-三羟基-4' -甲氧基异黄酮)通过1 H NMR光谱和质谱进行表征。大豆苷元(Ki