Does DHEA sulfate contribute to testosterone and estrogen production in postmenopausal women?

In postmenopausal women, the decline of ovarian function shifts the primary source of sex steroid production to adrenal precursors, specifically dehydroepiandrosterone sulfate (DHEAS).

Biochemical mechanisms of peripheral conversion

• Adrenal synthesis and transport: DHEAS is synthesized in the adrenal zona reticularis via CYP11A1 and CYP17A1 enzymes, and sulfated by cytosolic SULT2A1 using PAPS. This process creates a highly stable, hydrophilic circulating hormone reservoir.
• Intracrine desulfation: Target tissues (such as adipose tissue and skin) uptake circulating DHEAS via organic anion-transporting polypeptides. Once inside, the microsomal enzyme steroid sulfatase (STS) cleaves the sulfate group to form free DHEA.
• Downstream sex steroid synthesis: Free DHEA is metabolized by 3β-hydroxysteroid dehydrogenase (3β-HSD) to androstenedione, and then by 17β-hydroxysteroid dehydrogenase (17β-HSD) into active testosterone. Local aromatase enzymes subsequently convert these derived androgens into estrogens (estrone and estradiol).

Clinical and physiological relevance in menopause

• Primary sex hormone source: Following menopause, ovarian estrogen and androgen production declines drastically. Consequently, peripheral conversion of circulating adrenal DHEAS becomes the primary physiological source for downstream sex steroids, accounting for nearly 100% of active estrogens in the postmenopausal female body.
• Systemic responses: Exogenous supplementation of DHEA or its precursors significantly raises circulating levels of both testosterone and estradiol, with metabolic conversion often exhibiting a relative physiological preference toward the androgenic pathway.

Bottom line

• DHEAS acts as a vital adrenal precursor that drives local, intracrine testosterone and estrogen synthesis in postmenopausal women, serving as their principal source of active sex hormones via tissue-specific enzymatic pathways.