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• W1998221492 abstract "1. The release of prostacyclin (PGI2) from vascular endothelial cells is stimulated by ATP acting at G protein-coupled P2-purinoceptors. Here we investigate the hypothesis that tyrosine protein phosphorylations are involved in this response. 2. The use of Western blots with anti-phosphotyrosine antibodies showed that 30 microM 2MeSATP (selective for P2Y-purinoceptors), 300 microM UTP (selective for P2U-purinoceptors) and 300 microM ATP (effective at both these purinoceptors), each stimulate the tyrosine phosphorylation of proteins in bovine cultured aortic endothelial cells. Each of these agonists also stimulates 6-keto PGF1 alpha accumulation in the medium (an index of PGI2 release) in these cells in the same period. 3. The tyrosine kinase inhibitor, genistein, inhibits the 6-keto PGF1 alpha response with the same concentration-dependency (1-100 microM) as the tyrosine phosphorylation response. 4. Tyrphostin, a structurally and functionally distinct tyrosine kinase inhibitor, is also a potent inhibitor (0.1-10 microM) of the 6-keto PGF1 alpha response. 5. Neither tyrphostin nor genistein inhibit the phospholipase C response to P2-purinoceptor stimulation. Furthermore, these inhibitors do not affect the 6-keto PGF1 alpha response to ionomycin. 6. These results show that the regulation of vascular endothelial cells by ATP acting at both P2Y- and P2U-purinoceptors involves the stimulation of tyrosine phosphorylation, and suggest that this is a necessary event for the purinoceptor-mediated stimulation of PGI2 production." @default.
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• W1998221492 date "1995-11-01" @default.
• W1998221492 modified "2023-09-29" @default.
• W1998221492 title "Evidence for requirement of tyrosine phosphorylation in endothelial P2y- and P2u- purinoceptor stimulation of prostacyclin release" @default.
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• W1998221492 doi "https://doi.org/10.1111/j.1476-5381.1995.tb17208.x" @default.
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