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  • Title: Decanoyl lysophosphatidic acid induces platelet aggregation through an extracellular action. Evidence against a second messenger role for lysophosphatidic acid.
    Author: Watson SP, McConnell RT, Lapetina EG.
    Journal: Biochem J; 1985 Nov 15; 232(1):61-6. PubMed ID: 3853461.
    Abstract:
    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.
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