The alpha-3 beta-4 nicotinic receptor, also known as the α3β4 receptor and the ganglion-type nicotinic receptor,Pharmacology, (Rang, Dale, Ritter & Moore, , 5th ed., Churchill Livingstone 2003) p. 138. is a type of nicotinic acetylcholine receptor, consisting of α3 and β4 subunits. It is located in the autonomic ganglia and adrenal medulla, where activation yields post- and/or presynaptic excitation, mainly by increased Na+ and K+ permeability.
As with other nicotinic acetylcholine receptors, the α3β4 receptor is pentameric [(α3)m(β4)n where m + n = 5]. The exact subunit stoichiometry is not known and it is possible that more than one functional α3β4 receptor assembles in vivo with varying subunit stoichiometries.
Ligands which inhibit the α3β4 receptor have been shown to modulate drug-seeking behavior, making α3β4 a promising target for the development of novel antiaddictive agents.
Ligands
Source:
Agonists Acetylcholine (endogenous neurotransmitter that binds non-selectively to nAChRs and mAChRs) Anabaseine and other structural analogs Carbachol Cytisine (partial agonist) Dimethylphenylpiperazinium Epibatidine Lobeline Page 149 Nicotine RJR-2429
Antagonists
Competitive
DHβE SR 16584, highly selective over α4β2 and α7
Noncompetitive Dextromethorphan Dextrorphan Dextropropoxyphene Hexamethonium Imipramine Levacetylmethadol Mecamylamine Methadone Tubocurarine Bupropion Reboxetine Ibogaine Voacangine 18-MC 18-MAC ME-18-MC AT-1001 Choline
See also α3β2-Nicotinic receptor α4β2-Nicotinic receptor α7-Nicotinic receptor Muscle-type nicotinic receptor
References