mRNA expression of (a) CYP7A1 and (b) CYP8B1 in primary hepatocytes cultured on collagen and treated with 100 nM dexamethasone, 1 μM RU486, or the combination of dexamethasone and RU486 for 24 h. Data represent means ± SEM, A. U., arbitrary unit, ** P ≤ 0.01, *** P ≤ 0.001, n = 4 livers.