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- W1547722704 abstract "Activation of human platelets by complement proteins, C5b-9, thrombin plus collagen, or a Ca2+ ionophore results in surface exposure of phosphatidylserine (PS), accompanied by the expression of membrane catalytic activity for the tenase (VIIaIXa) and prothrombinase (VaXa) coagulation enzyme complexes. The mechanism underlying this surface exposure of PS upon platelet activation remains unresolved. Using fluorescent derivatives of PS (NBD-PS), we have investigated how the transmembrane migration of PS is related to microvesiculation of the platelet plasma membrane and to fusion of storage granules with the plasma membrane. Gel-filtered platelets were incubated with NBD-PS, allowing 90 +/- 10% of the incorporated NBD-PS to accumulate into the inner leaflet of the plasma membrane. Migration of NBD-PS from the inner leaflet to the plasma membrane surface was monitored by time-based flow cytometry, and correlated with the appearance of platelet microparticles and alpha-granule secretion. Platelet activation by C5b-9 or the Ca2+ ionophore, A23187, increased surface exposure of NBD-PS, due to acceleration of the apparent rate of migration from inner to outer plasma membrane leaflets. The onset of this accelerated migration of NBD-PS to the surface coincided with the onset of plasma membrane vesiculation, and the NBD-PS that partitioned into the membrane of the shed microparticle was also rapidly exposed to the surface (t1/2" @default.
- W1547722704 created "2016-06-24" @default.
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- W1547722704 date "1993-04-01" @default.
- W1547722704 modified "2023-10-15" @default.
- W1547722704 title "Contribution of platelet microparticle formation and granule secretion to the transmembrane migration of phosphatidylserine." @default.
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- W1547722704 doi "https://doi.org/10.1016/s0021-9258(18)53161-6" @default.
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