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The suppression by cannabidiol (CBD) of the liver microsomal drug-metabolizing enzyme activities in female rats was demonstrated and its mechanism was examined. Pretreatment of rats with CBD (10 mg/kg, i.p.) caused temporary decreases in contents of cytochrome P450 (P450) and b5 and NADPH-cytochrome c (P450) reductase activity compared with values from the vehicle control group. p-Nitroanisole O-demethylase, aniline hydroxylase, d-benzphetamine N-demethylase and delta 9-tetrahydrocannabinol 11-hydroxylase were also decreased by the CBD pretreatment. The latter two activities took a longer time to return to control levels than the former two. However, the CBD pretreatment, which reduced the protein level of P450 UT-2 (CYP2C11) in adult male rats, did not decrease the protein level of P450 F-1 (CYP2C6) or F-2 (CYP2C12) in liver microsomes from female rats. These results suggest that the mechanisms by which CBD suppresses liver microsomal drug-metabolizing enzyme activities are different in male and female rats.

Suppression of Liver Microsomal Drug-Metabolizing Enzyme Activities in Adult Female Rats Pretreated with Cannabidiol.