Neuronal nicotinic acetylcholine receptor α2β2 subtype (nAChR α2β2)

The neuronal nicotinic acetylcholine receptor α2β2 subtype is a pentameric ligand-gated ion channel, belonging to the Cys-loop receptor superfamily, formed by the co-assembly of α2 and β2 subunits (typically as heteropentamers)[1][2]. It mediates fast synaptic transmission by forming a cation-selective pore that opens upon binding the neurotransmitter acetylcholine, as well as exogenous ligands such as nicotine[1][2]. This subtype is predominantly expressed in certain regions of the brain and is involved in the modulation of neuronal excitability and neurotransmitter release[1][2]. It contributes to central processes including reward, cognition, and sensory processing, and has been implicated in neurodegenerative and neuropsychiatric disorders, as well as nicotine addiction[2][4]. Different subunit compositions result in diverse pharmacological and physiological properties; the α2β2 subtype, like other β2-containing nAChRs, is high-affinity for nicotine and shows unique sensitivity to other agonists and modulators[2].

Other names

Nicotinic acetylcholine receptor α2β2nAChR α2β2α2β2 neuronal nAChR

Allosteric ligand-gated ion channel activation (agonists bind and open cation channel); Channel desensitization (prolonged agonist exposure induces receptor desensitization); Modulation by positive/negative allosteric modulators