代谢
研究了环戊烷、环己烷和环庚烷及其相应的环烯和环氧乙烷对大鼠肝脏谷胱甘肽浓度的影响。大鼠被喂食这些化合物的浓度,范围从每公斤1.5到3.0微摩尔。在暴露后30分钟到4小时内评估总谷胱甘肽。暴露于溴代环烷烃会产生巯基尿酸,随着环大小的增加,形成的量减少。形成的环烷基硫基尿酸的量非常小。含硫代谢物主要由羟基巯基尿酸组成,其中3-羟基异构体是主要的代谢物。在给予环烯后,也观察到了类似的含硫代谢物排泄模式。环烯环氧乙烷被转化为2-羟基巯基尿酸,环戊烯和环庚烯的顺式和反式异构体都被排泄。在给予环己烯环氧乙烷后,只检测到微量的反式-2-羟基环己基硫基尿酸。所有这些化合物都会导致肝脏总谷胱甘肽浓度的下降;然而,溴代环烷烃的效果不那么明显。结果表明,代谢羟基化是由涉及细胞色素P-450的系统完成的。
The effect of cyclopentane, cyclohexane, and cycloheptane and the corresponding cycloalkenes and epoxides) on the concentration of glutathione in rat liver was investigated. Rats were fed concentrations of these compounds ranging from 1.5 to 3.0 micromoles per kilogram. Total glutathione was assessed 30 minutes to 4 hours after exposure. Exposure to the bromocycloalkanes gave rise to mercapturic acids with the amounts formed decreasing with increasing ring size. The amount of cycloalkylmercapturic-acid formed was very small. The sulfur containing metabolites consisted chiefly of hydroxymercapturic acids of which the 3-hydroxy isomer was the major metabolite. A similar pattern for the excretion of sulfur containing metabolites after the administration of the cycloalkenes was observed. Cycloalkene epoxides were converted to 2-hydroxymercapturic acids with both cis and trans isomers being excreted in the case of cyclopentene and cycloheptene. After dosing with cyclohexene-epoxide only traces of the trans-2-hydroxycyclohexyl-mercapturic-acid were detected. All the compounds caused a fall in the concentration of total glutathione in the liver; however, the effect was less marked with the bromocycloalkanes. The /results/ suggest that the metabolic hydroxylations are carried out by a system involving cytochrome-P-450.
来源:Hazardous Substances Data Bank (HSDB)