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Prostacyclin and other related compounds known to increase intracellular cAMP levels inhibit platelet responses. The mechanisms involved are only partially known, especially those concerning the complex relations between Ca 2 ÷ and cAMP as opposite intracellular mediators. Here, we have investigated aggregation and secretion in quin2-1oaded platelets under conditions in which Ca 2 ÷ and cAMP are the only intracellular mediators. Our results show that cAMP inhibits aggregation and secretion in ionophore-treated cell without modifying their intracellular Ca 2 + levels. This result suggests that the inhibition takes place on some intracellular target for Ca 2 +. cyclic AMP; Ionomycin; Secretion; Piatelet; intracellular Ca 2 +

No abstract