Metabolism of the Food-Borne Mutagen 2-Amino-3,8-dimethylimidazo[4,5-<i>f</i>]quinoxaline in Humans
作者:Robert J. Turesky、R. Colin Garner、Dieter H. Welti、Janique Richoz、Steve H. Leveson、Karen H. Dingley、Kenneth W. Turteltaub、Laurent B. Fay
DOI:10.1021/tx9701891
日期:1998.3.1
8-dimethylimidazo[4,5-f]quinoxalin-2-yl)sulfamic acid (MeIQx-N2-SO3(-)) and N2-(beta-1-glucosiduronyl)-2-amino-3,8-dimethylimidazo[4,5-f ]quinoxaline (MeIQx-N2-Gl). Two other metabolites were the cytochrome P450-mediated (P450) oxidation products 2-amino-8-(hydroxymethyl)-3-methylimidazo[4,5-f]quinoxaline (8-CH2OH-MeIQx), and N2-(beta-1-glucosiduronyl)-N-hydroxy-2-amino-3,8-dimethylimidaz o[4,5-f]quinoxaline (NOH-MeIQx-N2-Gl)
在五名人类志愿者中研究了2-氨基-3,8-二甲基咪唑并[4,5-f]喹喔啉(MeIQx)的代谢,这些志愿者的饮食等效为14C标记的MeIQx。尿中排泄的剂量范围为20.2%至58.6%,未代谢的MeIQx占剂量的0.7-2.8%。尿液中检测到5种主要代谢物,其中4种衍生物通过在线UV光谱和免疫亲和层析后的HPLC-MS表征。两种代谢物被鉴定为II期共轭物N2-(3,8-二甲基咪唑并[4,5-f]喹喔啉-2-基)氨基磺酸(MeIQx-N2-SO3(-))和N2-(β-1-葡糖二硬脂酰基)-2-氨基-3,8-二甲基咪唑并[4,5-f]喹喔啉(MeIQx-N2-Gl)。另外两个代谢物是细胞色素P450介导的(P450)氧化产物2-氨基-8-(羟甲基)-3-甲基咪唑[4,5-f]喹喔啉(8-CH2OH-MeIQx)和N2-(beta-1-glucosiduronyl)-N-hydroxy-2-amino-3