Alpha-4 beta-2 nicotinic acetylcholine receptor (α4β2 nAChR)

The alpha-4 beta-2 nicotinic acetylcholine receptor (α4β2* nAChR) is a subtype of pentameric ligand-gated ion channel primarily located in the central nervous system (UniProt P43681). It is composed of α4 and β2 subunits, often arranged in (α4)2(β2)3 or (α4)3(β2)2 stoichiometries, and is highly permeable to sodium and potassium ions upon activation by acetylcholine or nicotine (PubMed 17030136). This receptor plays a pivotal role in modulating the release of neurotransmitters such as dopamine, glutamate, and GABA, thereby influencing reward pathways, attention, and memory (StatPearls, "Nicotine"). In clinical contexts, α4β2* nAChRs are the principal mediators of nicotine addiction and are significantly reduced in the brains of patients with Alzheimer's and Parkinson's diseases (PubMed 10658647). Therapeutic strategies often involve partial agonists like varenicline, which reduce nicotine cravings by providing moderate receptor stimulation while blocking the effects of inhaled nicotine (PubChem CID 170311). Additionally, mutations in the genes encoding these subunits are linked to Autosomal Dominant Nocturnal Frontal Lobe Epilepsy (ADNFLE) (NIH Genetics Home Reference). The asterisk in the name denotes that these receptors may also incorporate auxiliary subunits, such as α5, which can further modulate their pharmacological properties (PubMed 16260614).

Other names

Neuronal acetylcholine receptor subunit alpha-4/beta-2nAChR alpha4beta2CHRNA4/CHRNB2 receptorAlpha4-beta2 nicotinic receptorα4β2* nAChR

Agonism or partial agonism of the pentameric ion channel leads to cation influx (Na+, K+, and sometimes Ca2+), resulting in membrane depolarization and the subsequent release of various neurotransmitters.