title: Pharmacological characterization of recombinant bovine alpha3beta4 neuronal nicotinic receptors stably expressed in HEK 293 cells.
abstract: In these studies, [(3)H]epibatidine is used as the radioligand to characterize recombinant bovine alpha3beta4 nicotinic acetylcholine receptors (nAChRs) expressed in HEK 293 cells. Specific binding reaches equilibrium quickly and is saturable with a K(d) value of 0.66 nM. The affinities of the several cholinergic agents were determined, including nicotine (K(i), 0.5 microM), cytisine (K(i), 0.5 microM), carbachol (K(i), 4.1 microM), dihydro-(beta)-erythroidine (K(i), 43.5 microM), d-tubocurarine (K(i), 0.1 microM), 1,1-dimethyl-4-phenylpiperazinium (K(i), 0.5 microM), decamethonium (K(i), 175 microM) and methyllycaconitine (K(i), 0.4 microM). These studies show that the pharmacological characteristics of recombinant bovine alpha3beta4 nAChRs are similar to native bovine alpha3beta4* nAChRs, and indicate that the alpha5 subunit, if present in the native nAChRs, does not affect ligand affinity.
authors.affiliation: Division of Pharmacology, The Ohio State University, College of Pharmacy, 500 West 12th Avenue, Columbus, OH 43210, USA.
authors.forename: R Benjamin
authors.initials: RB
authors.lastname: Free
authors.forename: Nathaniel D
authors.initials: ND
authors.lastname: von Fischer
authors.forename: R Thomas
authors.initials: RT
authors.lastname: Boyd
authors.forename: Dennis B
authors.initials: DB
authors.lastname: McKay
mesh_terms: D000818:Animals; D001667:Binding, Competitive / Q000187:drug effects; D015152:Blotting, Northern; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002417:Cattle; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D018678:Cholinergic Agents / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D007700:Kinetics; D008024:Ligands; D018722:Nicotinic Agonists; D011725:Pyridines; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D011978:Receptors, Nicotinic / Q000096:biosynthesis / Q000187:drug effects*; D011994:Recombinant Proteins / Q000187:drug effects
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D018678:Cholinergic Agents; D008024:Ligands; D018722:Nicotinic Agonists; D011725:Pyridines; D012333:RNA, Messenger; D011978:Receptors, Nicotinic; D011994:Recombinant Proteins; C403530:nicotinic receptor alpha3beta4; C082748:epibatidine