Comparative in vitro metabolism of phospho-tyrosol-indomethacin by mice, rats and humans
作者:Gang Xie、Dingying Zhou、Ka-Wing Cheng、Chi C. Wong、Basil Rigas
DOI:10.1016/j.bcp.2013.01.031
日期:2013.4
Here, we show that PTI was extensively metabolized in vitro and in vivo. PTI was rapidly hydrolyzed by carboxylesterases to generate indomethacin as its major metabolite in the liver microsomes and rats. PTI additionally undergoes cytochromes P450 (CYP)-mediated hydroxylation at its tyrosol moiety and O-demethylation at its indomethacin moiety. Of the five major human CYPs, CYP3A4 and CYP2D6 catalyze
Phospho-tyrosol-indomethacin (PTI; MPI 621) 是一种新型抗癌剂,比传统的吲哚美辛更有效、更安全。在这里,我们表明 PTI 在体外和体内都被广泛代谢。PTI 被羧酸酯酶迅速水解,生成吲哚美辛作为其在肝微粒体和大鼠中的主要代谢物。PTI 还在其酪醇部分经历细胞色素 P450 (CYP) 介导的羟基化,并在其吲哚美辛部分经历 O-去甲基化。五种主要的人类CYPs中,CYP3A4和CYP2D6分别催化PTI的羟基化和O-去甲基化反应;而 CYP1A2、2C9 和 2C19 对 PTI 无活性。与 PTI 相比,吲哚美辛主要被 CYP2C9 进行 O-去甲基化,后者更喜欢酸性底物。PTI 的水解和 O-去甲基化代谢物进一步被葡萄糖醛酸化和硫酸化,促进药物清除和解毒。我们观察到 PTI 代谢率的显着种间差异。在来自不同物种的肝微粒体中,PTI 分别在小鼠、人类和大鼠肝微粒体中水解、羟基化和