Nicotinic acetylcholine receptor alpha-4 beta-2 (α4β2 nAChR)

The Nicotinic acetylcholine receptor alpha-4 beta-2 is the principal heteromeric nAChR subtype in the human brain, composed of two alpha-4 and three beta-2 subunits or three alpha-4 and two beta-2 subunits (two possible stoichiometries, each with distinct sensitivities to nicotine and calcium permeability). It forms a pentameric ligand-gated cation channel that rapidly transduces signals upon acetylcholine or nicotine binding, facilitating the influx of Na^+^ and K^+^ ions and, to a lesser extent, Ca^2+^ ions. The receptor is critical for synaptic transmission, cognition, attention, and reward processing, mediating the addictive effects of nicotine and being implicated in numerous neurological and neuropsychiatric disorders. Its structure has been elucidated at atomic resolution, revealing detailed subunit arrangement and ligand interaction sites. The α4β2 nAChR is a major therapeutic target for smoking cessation, neurodegenerative and cognitive disorders, and pain management. Genetic mutations and pharmacological modulation of this receptor provide important biomarkers and candidate targets for intervention.

Other names

Alpha-4 beta-2 nicotinic receptorα4β2 receptorNeuronal nicotinic acetylcholine receptor alpha-4 beta-2 subtype

Agonists bind to ligand pockets at α4/β2 interfaces, triggering conformational change and ion channel opening Partial agonists result in desensitization or submaximal channel activation, supporting therapeutic efficacy in smoking cessation Antagonists block acetylcholine or nicotine binding, inhibiting receptor function