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• W2046047511 abstract "Elevating intracellular cAMP has been shown to inhibit platelet function. cAMP interferes with platelet-activating signals which lead to aggregation inhibition, but the precise mechanism is unclear. The present study examined if cAMP-elevating agents inhibited phosphatidylinositol 3-kinase (PI3-kinase) signaling in rat platelets by immunoblotting. Akt is one of the key molecules downstream of PI3K, and is phosphorylated by collagen stimulation. The phosphodiesterase-3 (PDE3) inhibitors cilostamide and cilostazol, and the adenylate cyclase activator forskolin, inhibited collagen-induced Akt phosphorylation at Ser473. The inhibitory effects of these cAMP-elevating agents on Akt phosphorylation were unchanged in the presence of the PKA (cyclic AMP-dependent protein kinase) inhibitor H-89. These effects were consistent with inhibition of platelet aggregation. It is known that inhibition of Akt phosphorylation leads to inhibition of phosphorylation of glycogen synthase kinase 3-beta (GSK-3beta), which is an effector of Akt, but cAMP-elevating agents stimulated GSK-3beta phosphorylation at Ser9. The PKA inhibitor H-89 attenuated GSK-3beta phosphorylation. The cAMP-elevating agents cilostamide, cilostazol and forskolin did not directly affect the enzyme activity of PI3-kinase. These results suggested that cAMP-elevating agents have two effects on PI3K signalling: inhibition of Akt phosphorylation independent of PKA; and stimulation of GSK-3beta phosphorylation dependent on PKA. Our results provide new insights into the inhibitory effect of cAMP-elevating agents on platelet function." @default.
• W2046047511 created "2016-06-24" @default.
• W2046047511 creator A5053407094 @default.
• W2046047511 creator A5054059972 @default.
• W2046047511 date "2009-01-01" @default.
• W2046047511 modified "2023-09-25" @default.
• W2046047511 title "Effects of the cAMP-elevating agents cilostamide, cilostazol and forskolin on the phosphorylation of Akt and GSK-3β in platelets" @default.
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• W2046047511 doi "https://doi.org/10.1160/th08-12-0781" @default.
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