Abstract
1. This study assessed the value of a static in vitro human hepatocyte-murine stromal cell co-culture model to qualitatively and quantitatively predict human in vivo metabolic clearance pathways using 14C-labeled test compounds and compared these results to an in vitro suspended human hepatocyte model and the in vivo human 14C ADME studies.
2. Test compounds represented a diverse set of clearance pathways (Phase I and Phase II). Compounds were incubated for 4 h in suspended human hepatocytes and for 24 and 168 h in the human co-culture model. Multivariate analysis revealed that long-term (168 h) incubation of test compounds in the co-culture had reasonable quantitative prediction of the in vivo human clearance pathways as compared to the 4 h suspended hepatocytes or the 24 h co-culture incubation.
3. In vivo and in vitro disconnects were observed in cases where extra-hepatic metabolism or urinary excretion was observed in vivo. Differences in the relative percentages of Phase I and Phase II metabolites observed were likely due to microbial β-glucuronidase hydrolysis of conjugates and microflora mediated metabolism in the gut not present in the in vitro systems.
Declaration of interest
This work was supported by Eli Lilly and Company. Cassidy and Yi are employees and shareholders of Eli Lilly and Co.