title: Nicotinic receptor-mediated intracellular calcium release in cultured bovine adrenal chromaffin cells.
abstract: When cultured bovine adrenal chromaffin cells were stimulated by a nicotinic agonist, carbamylcholine (0.3 mM) or 1,1-dimethyl-4-phenylpiperazinium (50 microM), in the Ca2+-free medium containing 0.1 mM ethyleneglycoltetraacetic acid, intracellular free Ca2+ concentration ([Ca2+]i) rose from approximately 90 to 149 nM. High K+ (56 mM) and veratridine (50 microM) had no effect on the [Ca2+]i in Ca2+-free medium. The carbamylcholine-evoked rise in [Ca2+]i was blocked by hexamethonium (0.1 mM) but not by atropine (1 microM). Furthermore, the carbamylcholine-evoked rise in [Ca2+]i was inhibited by an intracellular Ca2+ antagonist, 8-(N,N-diethylamino)-octyl-3,4,5-trimethoxy-benzoate hydrochloride (10 microM) but not by a calmodulin antagonist, N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide (20 microM). These results show the existence of intracellular Ca2+ store sites, from which Ca2+ is released upon nicotinic receptor stimulation, in cultured adrenal chromaffin cells.
mesh_terms: D000311:Adrenal Glands / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002395:Catecholamines / Q000378:metabolism; D002417:Cattle; D002478:Cells, Cultured; D002838:Chromaffin System / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D007425:Intracellular Membranes / Q000378:metabolism*; D009994:Osmolar Concentration; D011978:Receptors, Nicotinic / Q000502:physiology*
chemical_list: D002395:Catecholamines; D011978:Receptors, Nicotinic; D002118:Calcium