Carbachol-stimulated calcium entry in SH-SY5Y human neuroblastoma cells: which route?
M3 muscarinic receptors expressed on SH-SY5Y human neuroblastoma cells are linked to phosphoinositide turnover and rises in [Ca2+]i. The rise in [Ca2+]i is biphasic with the peak phase being due to release from an intracellular Ins(1,4,5)P3-sensitive site and the plateau phase being due to Ca2+ entry across the plasma membrane. Ca2+ entry does not appear to involve voltage sensitive Ca2+ channels, a pertussis toxin sensitive G-protein-operated Ca2+ channel or Ins(1,4,5)P3/Ins(1,3,4,5)P4-operated Ca2+ channel. We suggest that carbachol-stimulated Ca2+ entry in SH-SY5Y human neuroblastoma cells occurs via receptor operated Ca2+ channels and through capacitive refilling.
Department of Pharmacology and Therapeutics, University of Leicester, UK.
D G
DG
Lambert
S R
SR
Nahorski
D002118:Calcium / Q000378:metabolism*; D015220:Calcium Channels / Q000502:physiology; D002217:Carbachol / Q000494:pharmacology*; D004594:Electrophysiology; D019204:GTP-Binding Proteins / Q000502:physiology; D006801:Humans; D007295:Inositol Phosphates / Q000502:physiology; D007425:Intracellular Membranes / Q000378:metabolism; D009447:Neuroblastoma / Q000378:metabolism* / Q000473:pathology; D009994:Osmolar Concentration; D037342:Pertussis Toxin; D010716:Phosphatidylinositols / Q000378:metabolism; D011976:Receptors, Muscarinic / Q000502:physiology; D014407:Tumor Cells, Cultured; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
D015220:Calcium Channels; D007295:Inositol Phosphates; D010716:Phosphatidylinositols; D011976:Receptors, Muscarinic; D010566:Virulence Factors, Bordetella; D002217:Carbachol; D037342:Pertussis Toxin; D019204:GTP-Binding Proteins; D002118:Calcium