Biosynthesis of estrogens by microsomal placental aromatase; isolation and metabolism of 10β-hydroxyestr-4-ene-3,17-dione
Abstract
Incubation of [16,16,19-2H3][19-3H]-19-oxoandrost-4-ene-3,17-dione (2a) with microsomal aromatase gave inter alia[16,16-2H2]-10β-hydroxyestr-4-ene-3,17-dione (1), whose analogue (1b) on incubation with the aromatase gave 10β, 17β-dihydroxyestr-4-en-3-one (1d)(ca. 10%) and no estrogens which would indicate that (1b) is not an obligatory estrogen precursor.