PMID: 11907196Mar 22, 2002Paper

In vitro analysis of human drug glucuronidation and prediction of in vivo metabolic clearance

The Journal of Pharmacology and Experimental Therapeutics
M G SoarsR J Riley

Abstract

The glucuronidation of a number of commonly used hepatic uridine diphosphate glucuronosyltransferase drug substrates has been studied in human tissue microsomes. Prediction of in vivo hepatic drug glucuronidation from liver microsomal data yielded a consistent 10-fold under-prediction. Consideration of protein binding was observed to be pivotal when predicting in vivo glucuronidation for acid substrates. Studies using human intestinal microsomes demonstrated the majority of drugs to be extensively glucuronidated such that the intrinsic clearance (CL(int)) of ethinylestradiol (CL(int) = 1.3 microl/min/mg) was twice that obtained using human liver microsomes (CL(int) = 0.7 microl/min/mg). The potential extrahepatic in vivo glucuronidation was calculated for a range of drug substrates from human microsomal data. These results indicate the contribution of intestinal drug glucuronidation to systemic drug clearance to be much less than either hepatic or renal glucuronidation. Therefore, data obtained with intestinal microsomes may be misleading in the assessment of the contribution of this organ to systemic glucuronidation. The use of hepatocytes to assess metabolic stability for drugs predominantly metabolized by glucuronidation was...Continue Reading

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