代谢
Olodaterol主要通过直接的葡萄糖醛酸化以及甲基氧基上的O-去甲基化然后进行结合反应而被大量代谢。在已识别的六个代谢物中,只有未结合的去甲基化产物能与β2-受体结合。然而,在长期吸入推荐的治疗剂量后,这种代谢物在血浆中是不可检测的。细胞色素P450同种型CYP2C9和CYP2C8参与了olodaterol的O-去甲基化,而尿苷二磷酸糖基转移酶同种型UGT2B7、UGT1A1、1A7和1A9被发现参与了olodaterol葡萄糖醛酸酯的形成。
Olodaterol is substantially metabolized by direct glucuronidation and by O-demethylation at the methoxy moiety followed by conjugation. Of the six metabolites identified, only the unconjugated demethylation product binds to beta2-receptors. This metabolite, however, is not detectable in plasma after chronic inhalation of the recommended therapeutic dose. Cytochrome P450 isozymes CYP2C9 and CYP2C8, with negligible contribution of CYP3A4, are involved in the O-demethylation of olodaterol, while uridine diphosphate glycosyl transferase isoforms UGT2B7, UGT1A1, 1A7, and 1A9 were shown to be involved in the formation of olodaterol glucuronides.
来源:DrugBank