The Effect of Ritonavir on Human CYP2B6 Catalytic Activity: Heme Modification Contributes to the Mechanism-Based Inactivation of CYP2B6 and CYP3A4 by Ritonavir
摘要:
研究了重构系统中利托那韦 (RTV) 对人 CYP2B6 的基于机制的灭活。失活与时间、浓度和 NADPH 相关,K I 为 0.9 μM,k inact 为 0.05 min−1,分配比约为 3。液相色谱-串联质谱 (LC-MS/MS) 分析表明RTV 的质子化分子离子的 m/z 为 721,其两种主要代谢物是 m/z 737 的 MH+ 氧化产物和 m/z 580 的 MH+ 脱酰产物。用 10 μ 孵育可灭活 CYP2B6 M RTV 10 分钟导致催化活性和天然血红素损失约 50%,但未观察到脱辅基蛋白的修饰。 RTV被发现是一种有效的混合型可逆抑制剂(K i = 0.33 μM)和CYP2B6的II型配体(光谱解离常数- K s = 0.85 μM)。尽管之前的研究已经证明RTV是一种有效的基于机制的CYP3A4灭活剂,但导致灭活的分子机制尚未确定。在这里,我们提供的证据表明,RTV CYP3A4 失活是由于血红素破坏并形成血红素蛋白加合物所致。与 CYP2B6 类似,脱辅基蛋白没有显着修饰。此外,LC-MS/MS分析表明,在RTV代谢过程中,CYP3A4和人肝微粒体均形成具有MH+(m/z 858)的RTV-谷胱甘肽缀合物,表明异氰酸酯中间体的形成导致缀合物的形成。
Cytochrome P450 Oxidase Inhibitors and Uses Thereof
申请人:Klein Larry L.
公开号:US20080161246A1
公开(公告)日:2008-07-03
The present invention features compounds of formula I
or pharmaceutically acceptable salts, solvates or prodrugs thereof, and methods of using the same to inhibit the metabolizing activities of CYP enzymes. The present invention also features methods of using these compounds, salts, solvates or prodrugs to improve the pharmacokinetics of drugs that are metabolized by CYP enzymes.
CYTOCHROME P450 OXIDASE INHIBITORS AND USES THEREOF
申请人:Klein Larry L.
公开号:US20120083490A1
公开(公告)日:2012-04-05
The present invention features compounds of formula I
or pharmaceutically acceptable salts, solvates or prodrugs thereof, and methods of using the same to inhibit the metabolizing activities of CYP enzymes. The present invention also features methods of using these compounds, salts, solvates or prodrugs to improve the pharmacokinetics of drugs that are metabolized by CYP enzymes.
Cytochrome P450 oxidase inhibitors and uses thereof
申请人:Abbott Laboratories
公开号:EP2465855A1
公开(公告)日:2012-06-20
The present invention features compounds of formula (I) or pharmaceutically acceptable salts, solvates thereof, and compounds of formula (I) for use in inhibiting the metabolizing activities of CYP enzymes. The present invention also features compounds of formula (I) for use in improving the pharmacokinetics of drugs that are metabolized by CYP enzymes.