Studies on the mechanism of action of the aromatase inhibitor, 4-Hydroxyandrostenedione

Yusuf J. Abul-Hajj

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


[1β-3H], [1α,2α-3H] and [1β, 2β-3H] 4-Hydroxyandrostenedione (4-OH-A) were synthesized to study the mechanism of inhibition of aro-matase by 4-OH-A. Incubations of [1β-3H] and [1β,2β-3H] 4-OH-A with placental microsomes in the presence of NADPH showed very little loss of tritium, with aromatization of 4-OH-A ranging from 0.3 to 0.6 percent. No loss of tritium was observed in the absence of NADPH. The extent of covalent binding of 4-OH-A to microsomal proteins was higher with incubations in the absence of NADPH than with those in the presence of NADPH. These results are discussed in light of what has been proposed for the mechanism of androgen aromatization.

Original languageEnglish (US)
Pages (from-to)783-790
Number of pages8
Issue number6
StatePublished - Jun 1983


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