Hepatic metabolism of diclofenac: role of human CYP in the minor oxidative pathways
作者:Roque Bort、Katherine Macé、Alan Boobis、Marı́a-José Gómez-Lechón、Andrea Pfeifer、José Castell
DOI:10.1016/s0006-2952(99)00167-7
日期:1999.9
study was to re-examine the human hepatic metabolism of diclofenac, with special focus on the generation of minor hydroxylated metabolites implicated in the idiosyncratic hepatotoxicity of the drug. Different experimental approaches were used: human hepatocytes, human microsomes, and engineered cells expressing single human CYP (cytochromes P450). Human hepatocytes formed 3'-hydroxy-, 4'-hydroxy-, 5-hydroxy-
这项研究的目的是重新检查双氯芬酸的人肝代谢,特别关注与药物特异肝毒性有关的次要羟基化代谢产物的产生。使用了不同的实验方法:人肝细胞,人微粒体和表达单个人CYP(细胞色素P450)的工程细胞。人肝细胞形成了3'-羟基-,4'-羟基-,5-羟基-4',5-二羟基和N,5-二羟基双氯芬酸,以及几种内酰胺。人肝微粒体形成4'-和5-羟基双氯芬酸的过程遵循Michaelis-Menten动力学(Km 9 +/- 1 microM; Vmax 432 +/- 15 pmol / min / mg和Km 43 +/- 5 microM;和Vmax分别为15.4 +/- 0.6 pmol / min / mg)。将5-羟基双氯芬酸与人肝微粒体温育后检测到次生代谢物,产生4',5-二羟基双氯芬酸(Km 15 +/- 1 microM; Vmax 96 +/- 3 pmol / min / mg)和少量的N,