Metabolic Activation of Prasugrel: Nature of the Two Competitive Pathways Resulting in the Opening of Its Thiophene Ring
作者:Patrick M. Dansette、Julien Rosi、Justine Debernardi、Gildas Bertho、Daniel Mansuy
DOI:10.1021/tx3000279
日期:2012.5.21
two-step enzymatic conversion into a biologically active thiol metabolite. The first step is an esterase-catalyzed hydrolysis of its acetate function leading to a thiolactone metabolite 2c. The second step was described as a cytochrome P450 (P450)-dependent oxidative opening of the thiolactone ring of 2c, with intermediate formation of a reactive sulfenic acid metabolite that is eventually reduced to the
通常公认的抗血栓形成前药普拉格雷1c的生物激活机制是其两步酶促转化为具有生物活性的硫醇代谢物。第一步是酯酶催化的乙酸酯功能水解,生成硫代内酯代谢物2c。第二步被描述为2c硫代内酯环的细胞色素P450(P450)依赖性氧化开口,中间形成反应性亚硫酸代谢产物,最终被还原为相应的活性硫醇3c。本文介绍了1c代谢的详细研究用3'-甲氧基苯甲酰溴衍生化后,在允许完全分离硫醇代谢物异构体的条件下,通过人肝微粒体和人血清分析,并通过HPLC-MS分析。结果表明,有两个竞争的代谢途径可以打开2c硫代内酯环。先前描述的主要化合物是2c的P450和NADPH依赖性氧化还原生物活化作用导致的,并导致3c形成,这是两个先前报道的带有环外双键的硫醇非对映异构体。它在补充NADPH的人肝微粒体中发生,但在人血清中不发生。第二个是2c水解的结果,导致3c异构体,3c内,其中双键已从哌啶环中的环外位置迁移到环内位置。它在