Characterization of Na+ influx mediated by ATP(4-)-activated P-2 purinoceptors in PC12
SCIE
SCOPUS
- Title
- Characterization of Na+ influx mediated by ATP(4-)-activated P-2 purinoceptors in PC12
- Authors
- Choi, SY; Kim, KT
- Date Issued
- 1996-06
- Publisher
- STOCKTON PRESS
- Abstract
- 1 Micromolar levels of extracellular ATP increased cytosolic Na+ concentration ([Na+](i)) as well as cytosolic Ca2+ concentration ([Ca2+](i)) in PC12 cells. 2 Pretreatment of cells with tetrodotoxin, benzamil or thapsigargin did not alter the ATP-induced Na+ influx. 3 Increased extracellular Mg2+ concentration decreased the ATP effect. Furthermore, when the extracellular ATP pool was treated to contain corresponding calculated concentrations of ATP(4-), the increase in [Na+](i) stayed linked to the ATP(4-) concentration rather than to the total ATP concentrations in the stimulants. 4 Extracellular ATP does not create nonselective pores as shown by the fact that ethidium bromide does not enter the cells upon ATP stimulation. 5 Among the tested nucleotides, only adenosine 5'-O-(3-thiotriphosphate), 2-methylthio ATP and 2-chloro ATP also caused Na+ influx. 6 Reactive Blue 2 specifically decreased the ATP effect in a concentration-dependent manner. 7 The results suggest that extracellular ATP triggers Na+ influx through a P-2 purinoceptor which is activated by ATP(4-) in PC12 cells.
- Keywords
- P-2 purinoceptor; ATP(4-); SBFI; intracellular sodium; reactive blue 2; PC12 cell; RECEPTOR-OPERATED CHANNEL; RAT MAST-CELLS; PHEOCHROMOCYTOMA CELLS; NUCLEOTIDE RECEPTOR; ATP4 PERMEABILIZES; EXTRACELLULAR ATP; ENDOTHELIAL-CELLS; CALCIUM; BRADYKININ; RELEASE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21553
- DOI
- 10.1111/j.1476-5381.1996.tb15489.x
- ISSN
- 0007-1188
- Article Type
- Article
- Citation
- BRITISH JOURNAL OF PHARMACOLOGY, vol. 118, no. 4, page. 935 - 940, 1996-06
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- There are no files associated with this item.
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