alpha3beta2 nicotinic acetylcholine receptor (α3β2 nAChR)

The alpha3beta2 nicotinic acetylcholine receptor (nAChR) is a pentameric ligand-gated ion channel composed of alpha-3 (CHRNA3) and beta-2 (CHRNB2) subunits. It is a prominent subtype in the vertebrate autonomic nervous system, particularly within the sympathetic and parasympathetic ganglia, and is also found in specific central nervous system regions like the medial habenula and fasciculus retroflexus. The receptor mediates fast excitatory synaptic transmission by allowing the influx of cations such as sodium and calcium upon activation by its endogenous ligand, acetylcholine. In the pharmaceutical industry, the alpha3beta2 nAChR is a key target for developing treatments for nicotine addiction and chronic pain, as it plays a role in reward pathways and sensory processing. Selective antagonists, including various alpha-conotoxins derived from cone snail venom, are extensively used as research tools and are being explored for their analgesic potential. Additionally, this receptor is frequently used as a safety counter-target in the development of insecticides to ensure that compounds like neonicotinoids do not cause adverse effects in humans or other vertebrates.

Other names

Neuronal acetylcholine receptor subunit alpha-3/beta-2CHRNA3-CHRNB2 receptorGanglionic nicotinic receptor (alpha3beta2 subtype)alpha3beta2 nAChR

The receptor functions as a ligand-gated ion channel. Upon binding of acetylcholine or nicotine to the extracellular binding sites (typically at the interface of alpha and beta subunits), the channel undergoes a conformational change to an open state, allowing the influx of sodium and calcium ions. This leads to membrane depolarization and, in neurons, the triggering of action potentials or the modulation of neurotransmitter release.