Abstract
We previously established a method for assessing in vivo drug-metabolizing capacity by pharmacokinetic estimation of the quantity of cytochrome P450 (CYP) in vivo (PKCYP test), in which an apparent liver-to-blood free concentration gradient in vivo (qg) is introduced (Matsunaga et al., Jpn. J. Hosp. Pharm., 26: 492-504 (2000)). This method was applied to estimate the amount of CYP2C11 in rats treated with carbon tetrachloride (CCl4-treated rats). In this study, we estimated the amount of CYP1A2 in CCl4-treated rats by using acetanilide and caffeine as a probe and a model drug, respectively.
In CCl4-treated rats, the total body clearance (CLtot) of acetanilide and caffeine was about one-fifth and one-eighth of that in control rats, respectively. In CCl4-treated rats, the amount of CYP1A2 was predicted as 0.60±0.06 nmol/kg from the clearance of acetanilide mediated by CYP1A2. Moreover, the clearance of caffeine mediated by CYP1A2 in CCl4-treated rats was estimated as 0.47±0.05 mL/min/kg by using the predicted amount of CYP1A2. The observed value was 0.44±0.03 mL/min/kg, and the predicted value was within the 95% confidence interval of the observed value.
In conclusion, we have demonstrated that the PKCYP test can also be applied for estimating the amount of CYP1A2 in CCl4-treated rats.
