Can persistent psychosocial stress dysregulate HPA-axis signaling and lower morning cortisol and DHEA-S?

Persistent psychosocial stress triggers systemic physiological changes, driving a transition from acute HPA-axis hyperactivation to a state of chronic endocrine and physiological exhaustion.

Endocrine and HPA-axis dysregulation

• Hypoactive signaling: Prolonged stress downregulates the HPA axis, suppressing the typical 30-to-45-minute post-awakening cortisol surge (a blunted cortisol awakening response) commonly seen in late-stage burnout.
• Steroidogenic shunting: Sustained physiological demand shunts steroidogenesis away from protective androgen pathways, depleting adrenal reserves and significantly lowering basal DHEA-S levels.

Gastrointestinal and cognitive impacts

• CRF-driven dysmotility: Stress alters gut motility through sympathovagal imbalance (reduced vagal tone and sympathetic hyperactivity) and corticotropin-releasing factor (CRF) signaling. Central CRF₂ receptor activation delays gastric emptying, while CRF₁ signaling accelerates colonic transit. Locally, CRF triggers mucosal mast cell degranulation, which disrupts epithelial barrier integrity and promotes visceral hypersensitivity.
• Neurological atrophy: Chronic glucocorticoid exposure and flattened diurnal cortisol profiles cause hippocampal atrophy, prefrontal cortical dysfunction, and dendritic pruning. These structural changes impair synaptic plasticity, manifesting as measurable deficits in episodic memory, verbal learning, and executive control.

Bottom line

• Persistent psychosocial stress systematically impairs health by suppressing HPA-axis responsiveness (blunting the morning cortisol surge and depleting DHEA-S), altering gut motility through autonomic and CRF-receptor pathways, and driving hippocampal atrophy that leads to cognitive decline.