Alpha-3 beta-2 neuronal nicotinic acetylcholine receptor (α3β2 nAChR)

The Alpha-3 beta-2 (α3β2) neuronal nicotinic acetylcholine receptor is a pentameric ligand-gated ion channel composed of α3 and β2 subunits. It is expressed in various regions of the central nervous system, such as the thalamus and cerebellum, as well as in the peripheral autonomic ganglia (UniProt P32297, P17676). The receptor plays a vital role in mediating fast excitatory synaptic transmission and modulating the release of neurotransmitters like dopamine and norepinephrine (PubMed: 10657715). In clinical contexts, α3β2 nAChRs are significant targets for treating nicotine addiction and chronic pain, as they are involved in the brain's reward pathways and nociceptive processing (StatPearls: Nicotinic Receptors). However, developing drugs for this target is challenging because the α3 subunit is also a key component of the α3β4 receptor, which regulates autonomic functions; thus, high selectivity is required to avoid cardiovascular and gastrointestinal side effects. Research continues to explore the role of α3β2 in cognitive disorders and its potential as a biomarker for susceptibility to tobacco-related diseases.

Other names

CHRNA3-CHRNB2 receptorAlpha3beta2 nicotinic receptorNeuronal acetylcholine receptor subunit alpha-3/beta-2Cholinergic receptor nicotinic alpha 3 beta 2

The receptor functions as a ligand-gated ion channel; upon binding of acetylcholine or an agonist, it undergoes a conformational change to open a pore, allowing the influx of sodium (Na+) and calcium (Ca2+) ions, which leads to cell depolarization and subsequent signaling or neurotransmitter release.