Inhibition of rat liver low Km aldehyde dehydrogenase by thiocarbamate herbicides
作者:Bruch W. Hart、Morris D. Faiman
DOI:10.1016/s0006-2952(94)00491-9
日期:1995.1
these thiocarbamates that inhibited rat liver ALDH2 by 50% (ID50) when administered 8 hr before determination of ALDH2, was found to be 5.2, 3.1, 1.6, 12, and 174 mg/kg, respectively. These thiocarbamates were ineffective rat liver ALDH2 inhibitors in vitro, unless rat liver microsomes and an NADPH-generating system were added to the incubation. The respective thiocarbamate sulfoxides were formed when
N-N,N-二乙基硫醇氨基甲酸酯S-甲基(DETC-Me)是在双硫仑生物活化过程中形成的代谢产物。由DETC-Me形成其相应的亚砜S-甲基N,N-二乙基硫代氨基甲酸酯亚砜(DETC-MeSO)对于抑制低Km线粒体醛脱氢酶(ALDH2,EC 1.2.1.3)是必需的。DETC-Me的结构类似于具有一般结构R1R2NC(O)SR3的硫代氨基甲酸酯除草剂。所研究的代表性除草剂为正丙基,正丙基硫代氨基甲酸酯乙酯(EPTC),mo酸酯,戊酸酯,硫醇酸酯和丁酸酯。所有这些硫代氨基甲酸酯类除草剂均在体内抑制大鼠肝脏ALDH2。在测定ALDH2之前8小时给药时,这些抑制大鼠肝脏ALDH2 50%(ID50)的硫代氨基甲酸盐的剂量分别为5.2、3.1、1.6、12和174 mg / kg。这些硫代氨基甲酸酯在体外是无效的大鼠肝脏ALDH2抑制剂,除非将大鼠肝脏微粒体和NADPH生成系统加入培养液中。当将硫代