Does DHEA-S primarily come from the adrenal glands and indicate reduced adrenal androgen output with age?

Dehydroepiandrosterone sulfate (DHEA-S) is a critical steroid hormone that serves as a primary marker for adrenal function. The claim that DHEA-S is predominantly produced by the adrenal glands, declines with age, and reflects reduced adrenal androgen output is strongly supported by scientific evidence.

Adrenal production and specificity

DHEA-S is produced almost exclusively within the zona reticularis (ZR), the innermost layer of the adrenal cortex.

• Quantitative origin: Approximately 90–95% of circulating DHEA-S in adults originates from the adrenal glands. Unlike other androgens, the contribution from the gonads (testes or ovaries) is negligible, making DHEA-S a highly specific biomarker for adrenal activity.
• Molecular mechanism: The production is driven by the enzyme steroid sulfotransferase (SULT2A1), which is highly expressed in the ZR. This process is regulated by adrenocorticotropic hormone (ACTH), which upregulates key steroidogenic enzymes like CYP17A1.
• Stability: DHEA-S has a long half-life and stable serum concentrations, providing a reliable measure of integrated adrenal output rather than reflecting acute, minute-to-minute fluctuations.

Age-related decline (Adrenopause)

Serum DHEA-S levels undergo a predictable and significant decline as a natural part of the aging process, a phenomenon known as adrenopause.

• Trajectory of decline: Levels typically peak in early adulthood (ages 15–39) and decline by approximately 2–3% annually thereafter.
• Impact by age 60: For a 60-year-old male, DHEA-S levels have typically decreased by 70–75% compared to peak levels in his 20s. In older populations (65–88 years), levels may drop to just 10–20% of youthful concentrations.
• Cellular mechanisms: This decline is mechanistically linked to the progressive atrophy of the zona reticularis. Aging results in a reduction of ZR cell mass and a decreased expression of the co-factors (such as cytochrome b5) necessary for androgen synthesis.

Clinical significance of lower levels

Lower DHEA-S concentrations are a direct reflection of reduced biosynthetic capacity within the adrenal glands.

• Functional marker: Low serum DHEA-S (specifically levels below ~2040 nmol/L) serves as a hallmark of the "adrenopause onset threshold," correlating with the cellular loss of androgen-producing tissue.
• Physiological implications: While DHEA-S is a robust marker for baseline output, it reflects the gland's current secretory state rather than its dynamic "reserve" (the ability to respond to acute stress), which is typically assessed via ACTH stimulation tests.

Bottom line

The claim is fully supported. DHEA-S is a specific product of the adrenal glands that declines significantly with age due to the atrophy of the adrenal zona reticularis; therefore, lower levels directly reflect reduced adrenal androgen output.