title: Effects of extracellular ATP on Fe(2+)-induced cytotoxicity in PC-12 cells.
abstract: Extracellular ATP is known to cause a variety of changes, including the alteration of ion fluxes, cell growth, and other physiological activities. Recently, it has been suggested that ATP acts as an excitatory synaptic transmitter, which may produce a Ca2+ influx via the activation of a P2y purinoceptor. Rat pheochromocytoma (PC-12) cells are known to resemble rat sensory neurons and to possess a P2y purinoceptor. In this study, we demonstrated that extracellular ATP dose-dependently increased PC-12 cell death in the presence of ferrous ions. Voltage-sensitive calcium channel blockers and calpain and xanthine oxidase inhibitors were found to be effective at protecting PC-12 cells from Fe2+/ATP-induced lipid peroxidation and cell death. These results suggest that xanthine oxidase activation induced by calpains and subsequent free radical formation may be responsible for Fe2+/ATP-induced neuronal cell death.
authors.affiliation: Department of Pharmacology, University of Missouri, Columbia 65212.
authors.forename: Y
authors.initials: Y
authors.lastname: Cheng
authors.forename: P
authors.initials: P
authors.lastname: Wixom
authors.forename: M R
authors.initials: MR
authors.lastname: James-Kracke
authors.forename: A Y
authors.initials: AY
authors.lastname: Sun
mesh_terms: D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D002121:Calcium Channel Blockers / Q000494:pharmacology; D002154:Calpain / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects; D005296:Ferrous Compounds / Q000494:pharmacology*; D005609:Free Radicals; D015227:Lipid Peroxidation / Q000187:drug effects; D016716:PC12 Cells / Q000187:drug effects*; D051381:Rats; D014969:Xanthine Oxidase / Q000037:antagonists & inhibitors / Q000378:metabolism
chemical_list: D002121:Calcium Channel Blockers; D005296:Ferrous Compounds; D005609:Free Radicals; D000255:Adenosine Triphosphate; D014969:Xanthine Oxidase; D002154:Calpain; D000251:Adenosine Triphosphatases; C027201:ectoATPase