Metabolic N-hydroxylation. Use of substituent variation to modulate the in vitro bioactivation of 4-acetamidostilbenes
作者:Patrick E. Hanna、Richard E. Gammans、Russell D. Sehon、Man-Kil Lee
DOI:10.1021/jm00183a014
日期:1980.9
radiolabeled form, and the metabolites were identified and quantified by TLC, mass spectrometry, and liquid scintillation counting. The Vmax for N-hydroxylation of the 4'-CN analogue was 24% and the Km was 11% of that of 1. The glycolamide was a minor metabolite of the 4'-CN compound. The principal metabolite of the 4'-CH3 compound was the 4'-CH2OH derivative, the N-hydroxylated product being formed in small
N-羟基化是致癌性芳基酰胺生物活化中的重要步骤。该实验室以前的报道表明,反式-4-乙酰氨基二苯乙烯(1)的4'取代基的变化对其体外微粒体N-羟基化的速率有显着影响。为了进一步研究电负性和脂肪族取代基的作用,合成了1的4'-CN,4'-CH3、4'-C(CH3)3和4'-CF3类似物,并通过仓鼠进行了代谢转化肝微粒体。每种化合物均以放射性标记形式合成,并通过TLC,质谱和液体闪烁计数对代谢物进行鉴定和定量。4'-CN类似物的N-羟基化的Vmax为24%,Km为1的11%。乙醇酰胺是4'-CN的次要代谢物。-CN化合物。4'-CH3化合物的主要代谢产物是4'-CH2OH衍生物,少量生成N-羟基化产物。类似地,代谢4'-C(CH3)3类似物以产生反式-4'-[2-(羟甲基)-2-丙基] -4-乙酰氨基sti(26)以及痕量的异羟肟酸。4'-CF3底物产生少量的N-羟基化物质,作为唯一可检测的