Rat alpha-3 beta-4 nicotinic acetylcholine receptor (α3β4 nAChR) (α3β4 nAChR)

The rat alpha-3 beta-4 nicotinic acetylcholine receptor (α3β4 nAChR) is a pentameric ligand-gated ion channel composed of α3 and β4 subunits [2, 4]. It is primarily expressed in the autonomic ganglia, adrenal medulla, and specific central nervous system regions such as the medial habenula and interpeduncular nucleus [2, 11, 13]. In the periphery, it facilitates fast excitatory synaptic transmission within the autonomic nervous system, regulating involuntary organ functions [8, 10]. Centrally, the α3β4 subtype plays a critical role in the reward, aversion, and withdrawal pathways associated with substance use disorders [3, 6, 11]. Genetic variations in the CHRNA3-CHRNA5-CHRNB4 gene cluster are strongly linked to nicotine and alcohol dependence, and similar pathways are studied in rat models to develop anti-addictive therapies [6, 12, 13]. Pharmacological modulation of this receptor, particularly through antagonists or partial agonists like 18-methoxycoronaridine (18-MC) and varenicline, has shown promise in reducing drug-seeking behavior for nicotine, cocaine, and alcohol [3, 6, 7]. However, therapeutic targeting is challenged by potential autonomic side effects due to the receptor's widespread expression in the peripheral nervous system [2, 5]. Research continues to focus on developing selective ligands that can cross the blood-brain barrier while minimizing peripheral ganglionic activity [12, 13].

Other names

Ganglion-type nicotinic receptorGanglionic nAChRalpha3beta4* nAChRNeuronal acetylcholine receptor subunit alpha-3/beta-4

Agonist, Partial agonist, Non-competitive antagonist, Negative allosteric modulator, Channel blocker