CYP2C19 and 3A4 Dominate Metabolic Clearance and Bioactivation of Terbinafine Based on Computational and Experimental Approaches
作者:Mary A. Davis、Dustyn A. Barnette、Noah R. Flynn、Anirudh S. Pidugu、S. Joshua Swamidass、Gunnar Boysen、Grover P. Miller
DOI:10.1021/acs.chemrestox.9b00006
日期:2019.6.17
to TBF-A. Unlike microsomal reactions, N-denaphthylation was surprisingly efficient for CYP2C19 and 3A4, which was validated by controls. CYP2C19 was the most efficient among all reactions. Nonetheless, CYP3A4 was more selective at steps leading to TBF-A, making it more effective in terbinafine bioactivation based on metabolic split ratios for competing pathways. Model predictions did not extrapolate
Lamisil(特比萘芬)是一种有效的,处方广泛的抗真菌药物,可引起罕见的特发性肝毒性。拟议的毒性机制涉及通过三个N-脱烷基途径形成的反应性代谢物6,6-二甲基-2-庚烯-4-ynal(TBF-A)。我们是第一个使用人肝微粒体和建模方法进行体外研究来表征它们的,但对单个酶催化反应的了解仍然未知。在这里,我们采用了实验和计算工具,以通过特定的细胞色素P450同工酶评估特比萘芬的代谢。体外抑制剂表型研究表明,六个同工酶参与一个或多个N-脱烷基途径。CYP2C19和3A4参与了所有途径,因此,我们将其靶向用于通过重组同工酶进行稳态分析。CYP2C19和3A4相似地直接催化N-脱烷基化生成TBF-A。尽管如此,CYP2C19在N-去甲基化和导致TBF-A的其他步骤上比CYP3A4更有效。与微粒体反应不同,N-萘甲酰化对CYP2C19和3A4的作用出乎意料地有效,这已通过对照进行了验证。CYP2C1