Prediction of the clinical risk of drug-induced cholestatic liver injury using an in vitro sandwich cultured hepatocyte assay

Abstract

Drug-induced liver injury (Dili) is of concern to the pharmaceutical industry, and reliable preclinical screens are required. Previously, we established an in vitro bile acid-dependent hepatotoxicity assay that mimics cholestatic Dili in vivo. Here, we confirmed that this assay can predict cholestatic Dili in clinical situations by comparing in vitro cytotoxicity data with in vivo risk. For 38 drugs, the frequencies of abnormal increases in serum alkaline phosphatase (ALP), transaminases, gamma glutamyltranspeptidase (gGT), and bilirubin were collected from interview forms. Drugs with frequencies of serum marker increases higher than 1% were classified as high Dili risk compounds. In vitro cytotoxicity was assessed by monitoring lactate dehydrogenase release from rat and human sandwich-cultured hepatocytes (SCRHs and SCHHs) incubated with the test drugs (50 mM) for 24 hours in the absence or presence of a bile acids mixture. Receiver operating characteristic analyses gave optimal cutoff toxicity values of 19.5% and 9.2% for ALP and transaminases in SCRHs, respectively. Using this cutoff, high- and low-risk drugs were separated with 65.4-78.6% sensitivity and 66.7-79.2% specificity. Good separation was also achieved using SCHHs. In conclusion, cholestatic Dili risk can be successfully predicted using a sandwich-cultured hepatocyte-based assay.