Abstract
Genetically engineered animal models represent a substantial improvement in in vivo assessment of toxic pathways. Several transgenic mouse lines have been designed to detect specific toxic markers in response to xenobiotic exposure. They are suitable for in vivo large scale screening of potentially toxic effects of drugs and other xenobiotics, and are used as bioassay models for carcinogenicity testing. This contribution will focus on a different strategy, using transgenic knockout mouse lines, to investigate with more accuracy some metabolic pathways leading to the bioactivation or the bioinactivation of xenobiotics. Through direct knockout of cytochrome P450 (CYP) genes or the knockout of the transcriptional activator of CYP genes AHR (aryl hydrocarbon receptor), the involvement of hepatic metabolic enzymes in xenobiotic bioactivation will be exemplified.
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