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Platelets rapidly convert 1,2-didecanoyl-sn-glycerol into its corresponding phosphatidic acid and lysophosphatidic acid derivatives, thereby providing a means of introducing these two compounds into platelets. 1-Decanoyl-2-lyso-3-sn-phosphatidic acid, when added directly to platelets, induced platelet aggregation and raised intracellular Ca2+ levels at concentrations of 0.3 microM upwards, but was without effect when formed intracellularly from 1,2-didecanoylglycerol at an estimated concentration of approx. 47 microM. This indicates that the site of platelet activation by lysophosphatidic acid is extracellular. A concentration of thrombin (0.2 unit/ml), which produced maximal platelet aggregation, caused an estimated intracellular formation of 20 microM-lysophosphatidic acid in the presence of 2 mM-Ca2+; however, there was no detectable release of lysophosphatidic acid into the bathing medium. Lysophosphatidic acid, therefore, may not be an intracellular second messenger involved in platelet aggregation by thrombin.

biochemical journal

Decanoyl lysophosphatidic acid induces platelet aggregation through an extracellular action. Evidence against a second messenger role for lysophosphatidic acid