Nicotinic acetylcholine receptor α4β2 subunit (nAChR α4β2)

The nicotinic acetylcholine receptor α4β2 subunit is a pentameric ligand-gated ion channel primarily found in the brain, composed of α4 and β2 subunits in two main stoichiometries, (α4)_2(β2)_3 and (α4)_3(β2)_2[1][2][3]. This receptor is the main high-affinity target for nicotine, mediating its addictive properties and influencing cognitive processes such as attention and learning[1][2][3]. Upon acetylcholine or nicotine binding at the α4-β2 interface, the receptor undergoes conformational change, opening its ion-conducting pore, which allows cations (mainly Na⁺ and K⁺, with some Ca²⁺ permeability) to pass, depolarizing the neuron and triggering downstream effects[1][2][3][5]. Dysfunction or alteration in the α4β2 receptor is linked to several neurological diseases, addiction, and metabolic disorders[1][3]. The receptor is a major target for smoking cessation therapies (e.g., varenicline), as well as a focus of therapeutic development for cognitive and neurodegenerative disorders[3].

Other names

α4β2 receptoralpha-4 beta-2 nicotinic receptorα4β2-nicotinic receptor

Agonist binding to ligand binding pocket, causing channel opening and ion flux (Na⁺, K⁺, Ca²⁺) Desensitization upon prolonged exposure to agonists (such as nicotine), decreasing activity over time Partial agonists act as modulating agents, yielding submaximal activity