Fig. 5.
Bile acid synthesis. Bile acid synthesis and biotransformation in this LiverChip model may primarily stem from cholesterol metabolism by CYP7A1. Cholic, glycocholic, taurocholic, and glycochinodeoxycholic acids were detected by ultra-HPLC-MS in the medium. A glycine-conjugated bile acid (e.g., GCA) was the most abundant bile acid identified and was characterized as a biomarker in this coculture system. Each well was sampled twice to evaluate technical variation. BA, bile acid.