Neuronal nicotinic acetylcholine receptor alpha-4 beta-4 (nAChR α4β4)

The Neuronal nicotinic acetylcholine receptor alpha-4 beta-4 is a subtype of pentameric ligand-gated ion channels that mediate fast signal transduction in the nervous system. It is composed of alpha-4 and beta-4 subunits and is predominantly found in the autonomic ganglia and specific regions of the brain, such as the thalamus and hippocampus (UniProt, 2024). Upon activation by the endogenous neurotransmitter acetylcholine, the receptor undergoes a conformational change that opens a central pore, allowing the flow of cations such as Na+ and Ca2+ into the cell (PubMed, 2022). This receptor is a critical target in the study of nicotine dependence, as it contributes to the reinforcing effects of tobacco and the physiological response to nicotine (NIH, 2023). Drugs like varenicline and cytisine target this receptor, along with the alpha-4 beta-2 subtype, to assist in smoking cessation by modulating dopaminergic pathways (PubChem, 2024). Beyond addiction, the alpha-4 beta-4 receptor is investigated for its role in autonomic disorders and certain types of epilepsy, making it a significant focus for neuropharmacological research (StatPearls, 2023). Therapeutic challenges include achieving subtype selectivity to avoid adverse cardiovascular effects associated with autonomic ganglion stimulation (Journal of Neuroscience, 2021).

Other names

alpha4beta4 nicotinic receptorCHRNA4-CHRNB4 receptorNeuronal acetylcholine receptor subunit alpha-4 and beta-4 complexα4β4 nAChR

Agonist, partial agonist, or antagonist modulation of cation channel opening to regulate neuronal excitability and neurotransmitter release.