title: Development of a neural phenotype in differentiating ganglion cell-derived human neuroblastoma cells.
abstract: Human neuroblastoma cells (clone SHSY-5Y) induced to differentiate by 12-O-tetradecanoylphorbol-13-acetate (TPA) are shown to possess properties characteristic of mature ganglion cells. Elevation of the external K+ concentration, exposure to Ca2+ ionophore A23187, and acetylcholine all stimulate the release of preloaded 3H-noradrenaline in the presence but not in the absence of added Ca2+. Acetylcholine causes a fall in the 86Rb+ or 14C-TPMP equilibrium potential across the plasma membrane and stimulates 86Rb+ efflux. These responses are prevented by atropine. Acetylcholine and muscarine but not nicotine stimulate an increase in 45Ca2+ influx, an effect blocked by atropine. None of these responses have been observed in nondifferentiating cells. Muscarinic receptors, however, as measured by the binding of tritiated quinuclidinyl benzilate (3H-QNB), were present to a similar extent in control and differentiated cells. Both cell types also exhibit an accelerated release of Ca2+ in response to acetylcholine, but the control cells were at least 1 order of magnitude more sensitive to the agonist.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D001285:Atropine / Q000494:pharmacology; D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D002454:Cell Differentiation; D002999:Clone Cells; D005728:Ganglia, Sympathetic / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D008564:Membrane Potentials / Q000187:drug effects; D009116:Muscarine / Q000494:pharmacology; D009447:Neuroblastoma / Q000473:pathology*; D009638:Norepinephrine / Q000378:metabolism*; D010641:Phenotype; D011188:Potassium / Q000494:pharmacology; D011976:Receptors, Muscarinic / Q000378:metabolism; D012413:Rubidium / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D011976:Receptors, Muscarinic; D000001:Calcimycin; D001285:Atropine; D009116:Muscarine; D012413:Rubidium; D000109:Acetylcholine; D013755:Tetradecanoylphorbol Acetate; D011188:Potassium; D002118:Calcium; D009638:Norepinephrine