Alpha-6-containing neuronal nicotinic acetylcholine receptor (α6-nAChR) (α6-nAChR)

Alpha-6-containing neuronal nicotinic acetylcholine receptors (α6-nAChRs) are pentameric ligand-gated ion channels characterized by the inclusion of the α6 subunit, encoded by the CHRNA6 gene (UniProt P43681). These receptors are highly localized within the dopaminergic pathways of the central nervous system, specifically in the substantia nigra pars compacta and the ventral tegmental area, where they play a pivotal role in regulating dopamine release in the striatum (Gotti et al., 2010). Because of this restricted expression pattern compared to the more ubiquitous α4β2 and α7 subtypes, α6-nAChRs are considered high-value therapeutic targets for Parkinson's disease, where their loss is a hallmark of early dopaminergic neurodegeneration (Quik et al., 2011). Additionally, they are heavily implicated in the reinforcing effects of nicotine and other drugs of abuse, making them significant targets for smoking cessation therapies and substance use disorder treatments (Yang et al., 2011). Current drug development efforts focus on achieving high selectivity for α6-containing complexes to avoid off-target effects on the autonomic nervous system, which are typically mediated by α3β4-containing receptors.

Other names

Alpha-6 nicotinic receptorCHRNA6-containing receptorα6β2* nAChRα6β3β2* nAChRCholinergic receptor nicotinic alpha 6 subunitNeuronal acetylcholine receptor subunit alpha-6

Modulation of cation-selective ion channel activity to regulate the release of neurotransmitters, primarily dopamine, in the mesolimbic and nigrostriatal pathways (Gotti et al., 2010).