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• W2010213203 startingPage "149" @default.
• W2010213203 abstract "Summary. In previous work we have demonstrated that platelets depleted from secretory phospholipase A2 (sPLA2) produced similar amounts of thromboxane (Tx)B 2 as control platelets upon stimulation by thrombin. However, since depletion of sPLA2 was not total, this sole finding only suggested the non‐involvement of sPLA2 in arachidonic acid release. In the present study we provide further evidence for the non‐involvement of sPLA2 in arachidonic acid liberation during platelet activation. Thus, rabbit platelets exposed to thrombin secreted sPLA2, released free arachidonic acid and formed TxB 2 and inositol phosphates. In contrast, U46619, a stable prostaglandin (PG)H 2 analogue, activates phospholipase C (PLC) and induces release of sPLA2 without TXB 2 generation nor arachidonic acid liberation. At each concentration tested of both agonists, stimulation of sPLA2 activity paralleled the production of inositol phosphates. These data suggest that sPLA2 is dependent on phosphoinositide hydrolysis and on the release reaction and that it is not involved in the liberation of arachidonic acid from stimulated platelets. In addition, a dissociation was observed between sPLA2 and the enzyme involved in the arachidonic acid mobilization, suggesting that the liberation of this fatty acid from membrane phospholipids was mediated by cytosolic phospholipase A2 (cPLA2). Finally, PLC does not play a major role in arachidonic acid liberation, since U46619, which induced the breakdown of inositol phospholipids, failed to release arachidonic acid. In confirmation, neomycin, which inhibits PLC activity, failed to inhibit ATP, sPLA2 and arachidonic acid release upon stimulation of platelets by fluoroaluminate. These data demonstrate that sPLA2 is not involved in the arachidonic acid release by stimulated platelets and indicate that the activations of PLC, sPLA2 and cPLA2 are independent events." @default.
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• W2010213203 date "1994-09-01" @default.
• W2010213203 modified "2023-09-30" @default.
• W2010213203 title "Dissociation between the phospholipases C and A2 activities in stimulated platelets and their involvement in the arachidonic acid liberation" @default.
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• W2010213203 doi "https://doi.org/10.1111/j.1365-2141.1994.tb04990.x" @default.
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