Ganglionic nicotinic acetylcholine receptor (nAChR)

The ganglionic nicotinic acetylcholine receptor is a pentameric ligand-gated ion channel that mediates fast synaptic transmission within the autonomic ganglia of the sympathetic, parasympathetic, and enteric nervous systems. It is primarily composed of alpha-3 (CHRNA3) and beta-4 (CHRNB4) subunits, often in combination with others such as alpha-5 or beta-2, which distinguishes it from the muscle-type and major central nervous system nicotinic receptors. This receptor acts as the essential relay for all autonomic outflow from the central nervous system to peripheral effector organs. In disease, it is the primary target of autoantibodies in autoimmune autonomic ganglionopathy (AAG), leading to widespread autonomic failure. Pharmacologically, it was historically targeted by ganglionic blockers like hexamethonium to treat hypertension, though such use is now rare due to the broad side effects of non-selective autonomic inhibition. Modern research also explores its role in nicotine dependence and as a potential target for modulating autonomic dysfunction.

Other names

Ganglionic nicotinic acetylcholine receptorNeuronal nicotinic acetylcholine receptor alpha-3 subunitalpha3beta4 nicotinic acetylcholine receptorNn receptorGanglionic AChRCHRNA3Nicotinic receptor (ganglionic type)

Ligand-gated ion channel activation or antagonism