[Interactions between the immune and neuroendocrine systems: clinical implications]

Area of Science:

• Neuroendocrinology
• Immunology
• Physiology

Context:

• The endocrine and immune systems exhibit bidirectional communication.
• Hormones influence immune function, while immune responses modulate neuroendocrine activity.
• Shared ligands and receptors facilitate this complex crosstalk.

Purpose:

• To elucidate the intricate communication network between the endocrine and immune systems.
• To detail the role of cytokines in modulating the hypothalamo-pituitary-adrenal (HPA) axis.
• To explore mechanisms of cytokine access to the central nervous system.

Summary:

• Cytokines modulate the HPA axis at hypothalamic, pituitary, and adrenal levels, with acute central effects and slower peripheral actions.
• Mechanisms for cytokine brain entry include blood-brain barrier transport, circumventricular organs, and vagal nerve pathways.
• Immune-neuroendocrine interactions are crucial for homeostasis, regulating inflammatory responses and adapting to conditions like infection and inflammation.

Impact:

• Understanding these interactions is key to comprehending physiological and pathophysiological states.
• This crosstalk influences adaptive responses to stress, inflammation, and infection.
• Dysregulation may contribute to conditions like hypogonadism, hypothyroidism, and growth inhibition during inflammatory diseases.