Nicotinic acetylcholine receptor alpha3 beta2 subunit (nAChR α3β2)

Nicotinic acetylcholine receptor alpha3 beta2 subunit (nAChR α3β2) is a pentameric ligand-gated ion channel composed of combinations of α3 and β2 subunits, primarily expressed in neuronal tissue[3][5]. Upon binding acetylcholine or exogenous ligands such as nicotine, the receptor undergoes a conformational change that opens a central pore permeable to cations (mainly Na⁺ and Ca²⁺), resulting in rapid synaptic transmission[3][7]. α3β2 nAChRs play key roles in synaptic modulation, neurotransmitter release, and neural circuit function, particularly in the central and peripheral nervous systems. They are implicated in several diseases and behaviors, including nicotine dependence, pain signaling, and neurodegenerative processes. Selective ligands such as α-conotoxin MII are valuable tools for investigating the structure and function of this subtype, although there is therapeutic interest in exploiting its unique pharmacology for disorders related to cognitive dysfunction, pain, and addiction[2][3][4].

Other names

α3β2 nicotinic receptoralpha3beta2 nAChRalpha3 beta2 acetylcholine receptorneuronal nicotinic acetylcholine receptor alpha3 beta2

Agonists bind to the ligand-binding site at the α3/β2 subunit interface, inducing conformational changes that open the cation channel, resulting in influx of Na⁺ and Ca²⁺, and neuronal depolarization[1][3][5][7]. Antagonists block the binding site, preventing acetylcholine or nicotine from activating the receptor and inhibiting channel opening (e.g., α-conotoxin MII)[2]. Allosteric modulators modulate receptor activity from sites other than the canonical ligand-binding site.