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

The Alpha-3 beta-2 nicotinic acetylcholine receptor is a heteromeric ligand-gated ion channel composed of alpha-3 and beta-2 subunits, typically arranged in a pentameric structure (UniProt: P32297, P17676). It belongs to the Cys-loop superfamily of receptors and is expressed in specific regions of the central nervous system, such as the pineal gland and thalamic nuclei, as well as in peripheral autonomic ganglia (PubMed PMID: 21835171). Upon binding of the endogenous neurotransmitter acetylcholine or exogenous agonists like nicotine, the receptor undergoes a conformational change that opens a central pore, allowing the influx of cations such as sodium and calcium. This process results in membrane depolarization and the modulation of neurotransmitter release, contributing to various physiological processes including sensory processing and autonomic signaling (IUPHAR/BPS Guide to PHARMACOLOGY). In clinical contexts, this receptor subtype is a significant focus in studies of nicotine addiction and withdrawal, as well as a potential target for developing novel analgesics. However, drug development is complicated by the high structural similarity between different nicotinic receptor subtypes, which can lead to off-target effects such as cardiovascular stimulation or gastrointestinal issues.

Other names

CHRNA3-CHRNB2 receptorNeuronal acetylcholine receptor subunit alpha-3/beta-2α3β2 nicotinic receptorHeteromeric alpha-3 beta-2 nAChR

Agonist, Antagonist, Partial agonist