Can inflammatory activation and omega-3 deficiency amplify stress-axis signaling and suppress reproductive hormones?

Systemic inflammation and lipid mediator dysregulation, specifically an elevated arachidonic acid (AA) to omega-3 ratio, serve as potent bidirectional drivers of neuroendocrine dysfunction and reproductive hormone suppression.

Stress-axis amplification

• Cytokine-driven HPA activation: Pro-inflammatory cytokines, including IL-1, IL-6, and TNF-α, directly stimulate the hypothalamic-pituitary-adrenal (HPA) axis by promoting hypothalamic corticotropin-releasing hormone (CRH) and vasopressin release, alongside pituitary adrenocorticotropic hormone (ACTH) secretion. Under chronic activation, this leads to glucocorticoid receptor resistance.
• Eicosanoid signaling: An elevated AA to eicosapentaenoic acid (EPA) ratio promotes the synthesis of AA-derived PGE2, which acts as a key signal transducer triggering central CRH release and direct adrenal steroidogenesis, elevating baseline cortisol.

Reproductive hormone suppression

• Central HPG inhibition: Pro-inflammatory cytokines (such as IL-1β and TNF-α) centrally suppress the hypothalamic-pituitary-gonadal (HPG) axis, inhibiting gonadotropin-releasing hormone (GnRH) pulsatility and blunting pituitary luteinizing hormone (LH) secretion.
• Peripheral steroidogenic blockade: Peripherally, TNF-α and IL-6 act directly on testicular Leydig cells to downregulate the steroidogenic acute regulatory (StAR) protein, which impairs mitochondrial cholesterol transport and halts testosterone synthesis.

Mechanistic crosstalk

• Pathological feedback loops: Glucocorticoids released during HPA axis activation directly suppress the HPG axis through hypothalamic-pituitary alterations, leading to reduced reproductive hormone output.
• Membrane fatty acid mobilization: Chronic stress-axis signaling promotes the enzymatic release of AA from cell membranes, which further exacerbates omega-3 deficiency and drives a pro-inflammatory cascade.

Bottom line

• Bottom line: Inflammatory activation and an elevated AA/EPA ratio synergistically drive HPA axis hyperactivity while simultaneously suppressing testicular testosterone synthesis; mitigating this systemic inflammatory tone by restoring omega-3 status (EPA/DHA) helps normalize stress-axis reactivity and preserve reproductive endocrine function.