Vagus nerve signaling pathway

The **vagus nerve signaling pathway** encompasses the network of neural circuits through which the vagus nerve, the tenth cranial nerve, mediates bidirectional communication between the brain and visceral organs. This pathway includes both afferent (sensory) fibers transmitting information from the organs to the brain, and efferent (motor) fibers controlling organ function, especially via the parasympathetic nervous system. Key anatomical components involve the nucleus of the solitary tract (NTS), dorsal motor nucleus of the vagus, and numerous synaptic relays within the central autonomic network. The system regulates cardiac, respiratory, digestive, and immune functions, and plays critical roles in homeostasis, anti-inflammatory regulation (via the cholinergic anti-inflammatory pathway), stress response, and the modulation of mood and social behavior. While not a molecular target in the sense of a discrete protein or receptor, the vagus nerve signaling pathway is therapeutically targeted via electrical stimulation devices—most notably for treatment-resistant epilepsy, depression, and inflammatory diseases. The pathway consists of multiple molecular targets (including various receptors and neurotransmitters) but is not itself a single molecule or druggable entity[1][2][3][4][5].

Other names

Vagus nerve pathwaysVagus nerve signalingVagus nerve circuitsGut-brain axis (when referring specifically to vagal mechanisms)Neuro-immune axis (when referencing vagal roles)

Neuromodulation (electrical stimulation, e.g., vagus nerve stimulation, VNS); Activation/inhibition of neural reflex arcs (e.g., cholinergic anti-inflammatory pathway); Modulation of neurotransmitter release (not specific to pharmacological agonists/antagonists in the pathway context); Efferent signaling via acetylcholine at muscarinic and nicotinic receptors in target tissues