Phosphatidylinositol 4,5-bisphosphate mediates Ca2+-induced platelet α-granule secretion -: Evidence for type II phosphatidylinositol 5-phosphate 4-kinase function

To understand the molecular basis of granule release from platelets, we examined the role of phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P-2) in alpha -granule secretion. Streptolysin O-permeabilized platelets synthesized PtdIns(4,5)P-2 when incubated in the presence of ATP. Incubation of streptolysin O permeabilized platelets with phosphatidylinositol-specific phospholipase C reduced PtdIns(4,5)P-2 levels and resulted in a dose and time-dependent inhibition of Ca2+-induced alpha -granule secretion. Exogenously added PtdIns(4,5)P-2 inhibited alpha -granule secretion, with 80% inhibition at 50 muM PtdIns(4,5)P-2. Nanomolar concentrations of wortmannin, 33.3 muM LY294002, and antibodies directed against PtdIns 3-kinase did not inhibit Ca2+-induced alpha -granule secretion, suggesting that PtdIns 3-kinase is not involved in alpha -granule secretion. However, micromolar concentrations of wortmannin inhibited both PtdIns(4,5)P-2 synthesis and alpha -granule secretion by similar to 50%. Antibodies directed against type II phosphatidylinositol-phosphate kinase (phosphatidylinositol 5-phosphate 4-kinase) also inhibited both PtdIns(4,5)P-2 synthesis and Ca2+-induced alpha -granule secretion by similar to 50%. These antibodies inhibited alpha -granule secretion only when added prior to ATP exposure and not when added following ATP exposure, prior to Ca2+-mediated triggering. The inhibitory effects of micromolar wortmannin and anti-type II phosphatidylinositol-phosphate kinase antibodies were additive, These results show that PtdIns(4,5)P-2 mediates platelet alpha -granule secretion and that PtdIns(4,5)P-2 synthesis required for Ca2+-induced alpha -granule secretion involves the type II phosphatidylinositol 5-phosphate 4-kinase-dependent pathway.