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J. Biol. Chem., Vol. 255, Issue 17, 8057-8062, Sep, 1980

In vitro and in vivo metabolism of all-trans- and 13-cis-retinoic acid in hamsters. Identification of 13-cis-4-oxoretinoic acid

CA Frolik, PP Roller, AB Roberts and MB Sporn

Administration of either all-trans-[3H]- or 13-cis-[3H]retinoic acid to hamsters fed a normal diet results in the formation of a number of polar metabolites. At least one of these metabolites has been shown to be common to both isomers of retinoic acid and can be generated in a hamster liver 10,000 X g supernatant system using 13-cis-retinoic acid as substrate. It has been identified as 13-cis-4-oxoretinoic acid by mass spectral, ultraviolet absorption, and proton NMR characteristics, as well as by its co-migration with synthetic 13-cis-4-oxoretinoic acid in two different high pressure liquid chromatographic systems. In addition, its metabolic precursor, 13-cis-4-hydroxyretinoic acid, has been tentatively identified. These compounds are believed to be early metabolites in the elimination pathway of retinoic acid from the body.
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