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• W2000444831 endingPage "342" @default.
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• W2000444831 abstract "The effects of prostaglandin E2 (PGE2) on platelet function are believed to be the result of opposing mechanisms that lead to both enhancement and inhibition of platelet function. Enhancement of platelet function is known to be via EP3 receptors linked to Gi and inhibition of adenylyl cyclase. However, the receptors involved in inhibition of platelet function have not been fully defined. Here we have used measurements of platelet aggregation, calcium signaling and P-selectin expression to assess platelet function induced by platelet activating factor (PAF), thrombin receptor activating peptide (TRAP-6) and the thromboxane A2 mimetic U46619 respectively, to determine the effects of PGE2 and of selective prostanoid receptor agonists on platelet function. Their effects on vasodilator-stimulated phosphoprotein (VASP) phosphorylation were also determined. We also assessed the ability of selective prostanoid receptor antagonists to modify the effects of PGE2. The agonists and antagonists used were iloprost (IP agonist), ONO-DI-004 (EP1 agonist), ONO-AE1-259 (EP2 agonist), sulprostone (EP3 agonist), ONO-AE1-329 (EP4 agonist), CAY10441 (IP antagonist), ONO-8713 (EP1 antagonist), DG-041 (EP3 antagonist) and ONO-AE3-208 (EP4 antagonist). Using the agonists available to us we demonstrated that EP3, EP4 and IP receptors elicit functional responses in platelets. The EP3 receptor agonist promoted platelet aggregation, calcium signaling and P-selectin expression and this was associated with a reduction in VASP phosphorylation. Conversely agonists acting at IP and EP4 receptors inhibited platelet function and this was associated with an increase in VASP phosphorylation. The effects on platelet function and VASP phosphorylation of the selective prostanoid receptor antagonists used in conjunction with PGE2 were consistent with PGE2 interacting with EP3 receptors to enhance platelet function and with EP4 receptors (but not IP receptors) to inhibit platelet function. This is the first demonstration of the involvement of EP4 receptors in platelet responses to PGE2." @default.
• W2000444831 created "2016-06-24" @default.
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• W2000444831 date "2010-04-30" @default.
• W2000444831 modified "2023-09-26" @default.
• W2000444831 title "The role of prostanoid receptors in mediating the effects of PGE₂on human platelet function" @default.
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• W2000444831 doi "https://doi.org/10.3109/09537101003718065" @default.
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