Sex Differences in Stress Response Mechanisms

Stress response mechanisms engage a network of neuroendocrine, autonomic and behavioural systems that detect and counteract threats to homeostasis. Central to this response are the sympathetic–adreno–medullary (SAM) axis, which mediates rapid ‘fight or flight’ reactions via catecholamine release, and the hypothalamic–pituitary–adrenal (HPA) axis, which orchestrates slower glucocorticoid secretion. Evidence in human cohorts and animal models reveals that sex profoundly influences each stage of the stress cascade. Women and female rodents often exhibit heightened HPA activation and slower glucocorticoid negative feedback, whereas men and male rodents display more robust SAM responses. At the cellular level, sex differences emerge in receptor expression, neurotransmitter dynamics and receptor trafficking, notably in corticotropin-releasing factor and glucocorticoid receptors. These molecular divergences shape neuronal circuit adaptations—particularly within the locus coeruleus and reward-related nuclei—and translate into sex-specific behavioural outcomes, such as anxiety‐like responses, cognitive impairments and vulnerability to mood disorders. Understanding these differences is crucial for tailoring interventions and improving mental-health outcomes globally.

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Sex Differences in Stress Response Mechanisms publication trend

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Technical terms

HPA axis: The cascade spanning the hypothalamus, pituitary gland and adrenal cortex that controls glucocorticoid release in response to stress.

SAM axis: The sympathetic–adreno–medullary pathway responsible for rapid secretion of catecholamines (adrenaline and noradrenaline) during acute stress.

Locus coeruleus: A brainstem nucleus rich in noradrenergic neurons that modulates arousal, attention and autonomic stress reactions.

Corticosterone: The primary glucocorticoid in rodents, equivalent to cortisol in humans, regulating energy mobilisation and immune responses under stress.

Dopaminergic transmission: Signalling mediated by dopamine release and receptor activation, crucial for motivation, reward processing and stress adaptation.

References

1. Chronically dysregulated corticosterone impairs dopaminergic transmission in the dorsomedial striatum by sex-divergent mechanisms. Neuropsychopharmacology (2023).
2. Sexual differences in locus coeruleus neurons and related behavior in C57BL/6J mice. Biology of Sex Differences (2023).
3. Early life stress induced sex-specific changes in behavior is paralleled by altered locus coeruleus physiology in BALB/cJ mice. Neurobiology of Stress (2024).
4. Sex differences in stress-related receptors: "micro" differences with "macro" implications for mood and anxiety disorders. Biology of Sex Differences (2013).