Neuronal acetylcholine receptor subunit alpha-6 (nAChRα6)

Neuronal acetylcholine receptor subunit alpha‑6 is a protein encoded by the CHRNA6 gene that forms part of certain pentameric neuronal nicotinic acetylcholine receptors primarily found in the brain. These receptors are composed of various combinations of α and β subunits—most notably α4β2* and α4α5β2*, but also including α6β2*—and function as ligand-gated ion channels mediating fast synaptic transmission upon binding acetylcholine or exogenous ligands such as nicotine. The presence of α‑6 confers unique pharmacological properties, particularly high sensitivity to both endogenous neurotransmitter ACh and exogenous compounds like nicotine. These receptors are highly expressed on midbrain dopaminergic neurons where they regulate dopamine release—a process central to reward pathways implicated in addiction—and have been proposed as therapeutic targets for neurodegenerative diseases such as Parkinson’s disease due to their selective localization on these neurons[1][2][3].

Other names

Cholinergic receptor nicotinic alpha 6 subunitAlpha-6 nicotinic acetylcholine receptor subunitAcetylcholine receptor, nicotinic, alpha 6 (neuronal)CHRNA6Cholinergic receptor, nicotinic, alpha polypeptide 6[2][3]

Drugs act as agonists or antagonists at the ligand-binding site between subunits; agonists like nicotine activate the channel leading to cation influx and neuronal excitation; antagonists like mecamylamine inhibit this activity by blocking the channel or preventing conformational change.[1][2][3]