Figure 3.
Metabolism of all-trans-RA in transfected COS-1 cells. Conversion of all-trans-RA to water-soluble metabolites is observed in P450RAI-2- or P450RAI-1-expressing cells compared with pcDNA vector or media alone control samples (A). Fractions from HPLC chromatography were grouped into three regions (all-trans-RA substrate, 4-OH region, and polar region), which allowed quantification of the different classes of retinoid metabolites.