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In an attempt to develop blood lymphocyte cytochrome P450 expression profile as a surrogate to monitor tissue enzyme, the present study aimed to identify the expression and regulation of polycyclic aromatic hydrocarbons (PAHs) responsive CYPs in freshly prepared rat blood lymphocytes. Semi-quantitative and RT-PCR studies demonstrated constitutive and inducible mRNA expression of CYP1A1, 1A2, 1B1 isoenzymes...
Freshly isolated peripheral blood lymphocytes from control rats were found to catalyze the N-demethylation of erythromycin, known to be mediated by cytochrome P450 3A (CYP3A) isoenzymes in rat liver. Pretreatment of rats with dexamethasone (100 mg/kg×3 days, i.p.), a CYP3A inducer, resulted in 3–4-fold increase in the activity of erythromycin demethylase (EMD) in freshly isolated peripheral blood...
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