Neuroimmune modulation

Neuroimmune modulation refers to the bidirectional communication between the nervous system and immune system that regulates inflammatory responses throughout the body. This interaction occurs through defined anatomical structures known as neuro–immune cell units where neurons and immune cells colocalize. Key mechanisms include neurotransmitter release from nerves affecting local immunity, expression of neurotransmitter receptors on immune cells enabling direct neuronal control over cytokine production, and feedback loops involving central autonomic circuits like those mediated by the vagus nerve ("cholinergic anti-inflammatory pathway") which can dampen excessive inflammation without broadly suppressing immunity. Therapeutically targeting these pathways—most notably using electrical vagus nerve stimulation—is being explored for treatment-refractory autoimmune/inflammatory conditions such as Crohn’s disease, rheumatoid arthritis, and potentially multiple sclerosis due to its ability to reduce pro-inflammatory cytokines while preserving host defense functions.[1][3][4][6][8][9] “Neuroimmune modulation involves tapping into neural reflex arcs that allow the brain to communicate with the immune system... The vagus nerve... acts as an immune sentry... resetting how robust the immune reaction should be.” [9] In summary: • "Neuroimmune modulation" is not a discrete molecular target. • It encompasses complex physiological processes involving many molecules/receptors. • The most clinically advanced application is device-based vagus nerve stimulation.

Other names

NeuroimmunomodulationNeuroimmune regulationCholinergic anti-inflammatory pathwayInflammatory reflex

Electrical stimulation of vagus nerve activates afferent/efferent neural circuits that suppress pro-inflammatory cytokine release via α7 nicotinic acetylcholine receptors on immune cells—reducing NFκB activation and inflammasome activity without global immunosuppression. Catecholamines released from nerves can suppress lymphocyte activation through cAMP-dependent/independent signaling in T/B cells. Activation of specialized brainstem centers via neural reflex arcs resets peripheral inflammatory setpoints ("inflammatory reflex").