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In rats, treatment with spironolactone or pregnenolone-16α-carbonitrile (PCN) accelerates bile flow and enhances hepatic microsomal bilirubin–UDP glucuronyltransferase activity (EC 2.4.1.17) and the biliary transport maximum (Tm) of bilirubin. The distribution of ethylanthranilate azo-pigments in fractions separated by thin-layer chromatography also indicates increased glucuronidation of bilirubin. These findings explain the mechanism of enhanced serum bilirubin disappearance in rats treated with the steroids.

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