Mouse liver CYP2C39 is a novel retinoic acid 4-hydroxylase. Its down-regulation offers a molecular basis for liver retinoid accumulation and fibrosis in aryl hydrocarbon receptor-null mice.

Abstract excerpt

Livers of aryl hydrocarbon receptor (AHR)-null mice have high levels of retinoic acid (RA), retinol, and retinyl palmitate. Hepatic accumulation of RA in these mice may be responsible in part for the hepatic phenotype characterized by small liver size and fibrosis. The increased levels of hepatic RA may be due to decreased metabolism of RA to 4-hydroxyretinoic acid. To identify the P450 isoform(s) involved in RA...

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