代谢
托匹司他主要通过肝脏代谢失活。2-羟基托匹司他是由药物通过黄嘌呤氧化酶进行初级羟基化形成的,并且对酶的抑制活性仍然保持。托匹司他N-氧化物是另一种可以在血浆和尿液中检测到的主要代谢物。确定N-氧化物和羟基代谢物分别是吡啶N-氧化物和吡啶2(或6)-羟基。托匹司他主要通过肝脏代谢失活,其中它经历葡萄糖醛酸化。托匹司他代谢为N1-和N2-葡萄糖醛酸苷主要通过UGT1A1、1A7和1A9介导,其中UGT1A9最为主要。
Topiroxostat is mainly inactivated by hepatic metabolism. 2-hydroxy topiroxostat is formed from primary hydroxylation of the drug by xanthine oxidase and still retains an inhibitory activity on the enzyme. Topiroxostat N-oxide is another major metabolite that can be detected in plasma and urine. It is determined that the N-oxide and hydroxide metabolites are pyridine N-oxide and pyridine 2 (or 6)-hydroxide, respectively. Topiroxostat is mainly inactivated by hepatic metabolism where it undergoes glucuronidation. The metabolism of topiroxostat to N1-and N2-glucuronide conjugates is mainly mediated by UGT1A1, 1A7, and 1A9, with UGT1A9 being the most predominant.
来源:DrugBank