Can chronic inflammation from infections or toxicants suppress adrenal and gonadal steroid production?

The relationship between chronic inflammation and the endocrine system is well-documented, particularly in the context of aging and persistent environmental or infectious challenges. Chronic inflammatory signaling creates a biochemical environment that can actively suppress the production of adrenal and gonadal steroids.

Clinical and effectiveness evidence

• Inflammatory Markers and DHEA-S: Research consistently demonstrates an inverse relationship between pro-inflammatory cytokines, such as Interleukin-6 (IL-6) and Tumor Necrosis Factor-alpha (TNF-α), and circulating DHEA-S levels. In the context of "inflammaging," rising systemic inflammation is a significant contributor to the decline of adrenal androgens.
• Toxicant Impact: Exposure to environmental toxicants, including certain mycotoxins (e.g., aflatoxin B1), acts as a potent endocrine disruptor. These substances induce oxidative stress and systemic inflammatory responses that correlate with reduced sex-steroid output in clinical and observational data.
• HPA and HPG Axis Dysregulation: Chronic inflammation modulates the Hypothalamic-Pituitary-Adrenal (HPA) and Gonadal (HPG) axes. Cytokines can attenuate the responsiveness of these axes to regulatory hormones like Luteinizing Hormone (LH), leading to a global reduction in steroidogenic capacity over time.

Mechanistic explanations

• Enzymatic Inhibition: Pro-inflammatory cytokines trigger the NF-κB pathway, which transcriptionally represses key steroidogenic enzymes. Specifically, TNF-α has been shown to inhibit the expression of CYP11A1 (the cholesterol side-chain cleavage enzyme) and CYP17A1, which are essential for the synthesis of DHEA and other sex steroids.
• Oxidative Stress (ROS): Persistent infection or toxicant exposure generates Reactive Oxygen Species (ROS). Within the mitochondria of steroidogenic cells, ROS can damage the Steroidogenic Acute Regulatory (StAR) protein, the rate-limiting step in moving cholesterol into the mitochondria for processing.
• Substrate Depletion: DHEA-S serves as the primary precursor for peripheral estrogen and testosterone synthesis. When inflammatory signaling suppresses adrenal DHEA-S production, it inherently limits the pool of substrates available for broader sex-steroid production, exacerbating the hormonal shifts associated with aging.

Bottom line

Chronic inflammatory signaling from toxicants or persistent infections suppresses the HPA/HPG axes and inhibits critical steroidogenic enzymes (like CYP17A1) through NF-κB and oxidative pathways. This leads to a measurable reduction in DHEA-S and downstream sex steroids, which may be particularly impactful in older adults already experiencing age-related endocrine shifts.