Cytokine Interactions in Neuroendocrine Regulation

Cytokines function as pivotal messengers between the immune and neuroendocrine systems, coordinating responses to infection, stress and injury. Proinflammatory mediators such as interleukin-1, interleukin-6 and tumour necrosis factor act on the hypothalamus to modulate corticotrophin-releasing hormone secretion, thereby influencing the hypothalamus–pituitary–adrenal axis. Conversely, glucocorticoid hormones released by the adrenal cortex exert feedback control on immune cells, dampening cytokine release and restoring homeostasis. At the cellular level, microglia and astrocytes in the central nervous system not only produce cytokines but also mediate synaptic plasticity through a tripartite synapse, integrating metabolic, hormonal and immune signals. Dysregulation of these pathways underlies chronic inflammation, behavioural changes and neurodegenerative processes. Recent advances have revealed novel endocrine circuits in which cytokines directly modulate pituitary and adrenal function beyond classical axes, and have highlighted the role of neuroimmune synapses in the fine-tuning of stress resilience. These interactions bear significant implications for the treatment of autoimmune disorders, depression and chronic pain, offering opportunities for targeted modulation of cytokine-driven pathways to restore systemic balance and protect neural integrity.

Research from Nature Portfolio

Recent studies have elucidated the balance between cytokine release and HPA axis activity in human disease. In a cohort of patients with coronary artery disease, acute physical exercise provoked a disproportionate rise in interleukin-6 without corresponding activation of adrenocorticotropic hormone or cortisol, indicating a relative hypoactivity of glucocorticoid feedback in inflamed vascular tissue. These findings underscore the potential of IL-6 as both a biomarker and a therapeutic target for restoring neuroendocrine equilibrium in cardiovascular pathology.

Cytokine Interactions in Neuroendocrine Regulation publication trend

The graph below shows the total number of articles in cytokine interactions in neuroendocrine regulation across all publications each year (not limited to Nature Index journals).

Technical terms

Cytokine: A small protein released by immune cells that mediates intercellular communication during inflammation and immune responses.

Hypothalamus–pituitary–adrenal axis: A hormonal cascade in which the hypothalamus stimulates the pituitary to release adrenocorticotropic hormone, triggering cortisol production from the adrenal glands.

Glucocorticoid: A class of steroid hormones, including cortisol, that regulate metabolism, immune function and stress responses.

Interleukin-6 (IL-6): A pleiotropic cytokine involved in fever, acute-phase responses and modulation of HPA axis activity.

Tripartite synapse: A synaptic structure comprising a pre-synaptic neuron, a post-synaptic neuron and an astrocyte that modulates neurotransmitter and cytokine signalling.

Astrocyte: A glial cell type in the central nervous system that supports neurons, regulates neurotransmitter levels and participates in immune signalling.

References

1. Pituitary-immune bidirectional crosstalk under systemic inflammation. PLOS Biology (2023).
2. The Role of Cortisol in Chronic Stress, Neurodegenerative Diseases, and Psychological Disorders. Cells (2023).
3. The effect of acute exercise on interleukin-6 and hypothalamic–pituitary–adrenal axis responses in patients with coronary artery disease. Scientific Reports (2020).
4. A Glucocorticoid-Mediated Immunoregulatory Circuit Integrated at Brain Levels: Our Early Studies and a Present View. NeuroImmunoModulation (2024).