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Androstenedione, or 4-androstenedione (abbreviated as A4 or Δ 4-dione), also known as androst-4-ene-3,17-dione, is an endogenous weak androgen steroid hormone and intermediate in the biosynthesis of estrone and of testosterone from dehydroepiandrosterone (DHEA). It is closely related to androstenediol (androst-5-ene-3β,17β-diol).
As DHEA-S can be converted back into DHEA, it serves as a circulating reservoir for DHEA, thereby extending the duration of DHEA. [57] [20] Metabolites of DHEA include DHEA-S, 7α-hydroxy-DHEA, 7β-hydroxy-DHEA, 7-keto-DHEA, 7α-hydroxyepiandrosterone, and 7β-hydroxyepiandrosterone, as well as androstenediol and androstenedione. [8]
Androstanedione, also known as 5α-androstanedione or as 5α-androstane-3,17-dione, is a naturally occurring androstane (5α-androstane) steroid and an endogenous metabolite of androgens like testosterone, dihydrotestosterone (DHT), dehydroepiandrosterone (DHEA), and androstenedione. [1] It is the C5 epimer of etiocholanedione (5β ...
Dehydroepiandrosterone (DHEA), DHEA sulfate (DHEA-S), and androstenedione may all be considered proandrogens of testosterone. [ 1 ] In the last two decades, prohormones have also been used by bodybuilders, athletes, and nonmedical users of AAS and other hormones to refer to substances that are expected to convert to active hormones in the body.
3β-HSD II mediates three parallel dehydrogenase/isomerase reactions in the adrenals that convert Δ 4 to Δ 5 steroids: pregnenolone to progesterone, 17α-hydroxypregnenolone to 17α-hydroxyprogesterone, and dehydroepiandrosterone (DHEA) to androstenedione. 3β-HSD II also mediates an alternate route of testosterone synthesis from androstenediol in the testes. 3β-HSD deficiency results in ...
3β-Hydroxysteroid dehydrogenase/Δ 5-4 isomerase (3β-HSD) (EC 1.1.1.145) is an enzyme that catalyzes the biosynthesis of the steroid progesterone from pregnenolone, 17α-hydroxyprogesterone from 17α-hydroxypregnenolone, and androstenedione from dehydroepiandrosterone (DHEA) in the adrenal gland.
Dehydroepiandrosterone sulfate, abbreviated as DHEA sulfate or DHEA-S, also known as androstenolone sulfate, is an endogenous androstane steroid that is produced by the adrenal cortex. [1] It is the 3β- sulfate ester and a metabolite of dehydroepiandrosterone (DHEA) and circulates in far greater relative concentrations than DHEA. [ 2 ]
Androstenedione (4-androstenedione, A4) 4-Androstenedione – Atamestane: 1-Methyl-δ 1-4-androstenedione – Boldione (1,4-androstadienedione) δ 1-4-Androstenedione – Dehydroepiandrosterone (DHEA, 5-DHEA; prasterone, androstenolone) 5-Dehydroepiandrosterone Exemestane: 6-Methylidene-δ 1-4-androstenedione Formestane: 4-Hydroxy-4 ...