PMID: 12695346Apr 16, 2003Paper

Utility of hepatocytes in predicting drug metabolism: comparison of hepatic intrinsic clearance in rats and humans in vivo and in vitro

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Yoichi NaritomiYuichi Sugiyama

Abstract

We investigated hepatic in vitro intrinsic clearance (CL(int,in vitro)) in freshly isolated or cryopreserved hepatocytes and compared with CL(int,in vivo) by using nine model compounds, FK1052, FK480, diazepam, diltiazem, troglitazone, quinotolast, FK079, zidovudine, and acetaminophen, in rats and humans. The compounds showed a broad range of in vivo hepatic extraction ratios (rat, 0.05-0.93; humans, 0.03-0.76) and were metabolized by hepatic P450, UDP-glucuronosyltransferase, sulfotransferase, and/or esterase. CL(int,in vitro) was determined from substrate disappearance rate at 1 microM in hepatocytes. CL(int,in vivo) was calculated from in vivo pharmacokinetic data using two frequently used mathematical models (the well stirred and dispersion models). When estimating rat CL(int,in vitro) in freshly isolated hepatocytes, the rat scaling factor values (CL(int,in vivo)/CL(int,in vitro)) showed marked difference among the model compounds (0.2-73.1-fold). The rat CL(int,in vitro) values in freshly isolated hepatocytes were in good agreement with these in cryopreserved hepatocytes. Human CL(int,in vitro) were determined by use of cryopreserved hepatocytes. When human CL(int,in vitro) was regarded as the predicted CL(int,in vivo), t...Continue Reading

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Citations

Nov 26, 2009·Journal of Pharmacokinetics and Pharmacodynamics·Agnès PoirierThierry Lavé
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