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- W1540375091 endingPage "1702" @default.
- W1540375091 startingPage "1694" @default.
- W1540375091 abstract "Factor V (FV) present in platelet -granules has a significant but incompletely understood role in hemostasis. This report demonstrates that a fraction of platelets express very high levels of surface-bound, -granule FV on simultaneous activation with 2 agonists, thrombin and convulxin, an activator of the collagen receptor glycoprotein VI. This subpopulation of activated platelets represents 30.7% ± 4.7% of the total population and is referred to as convulxin and thrombin–induced-FV (COAT-FV) platelets. COAT-FV platelets are also observed on activation with thrombin plus collagen types I, V, or VI, but not with type III. No single agonist examined was able to produce COAT-FV platelets, although ionophore A23187 in conjunction with either thrombin or convulxin did generate this population. COAT-FV platelets bound annexin-V, indicating exposure of aminophospholipids and were enriched in young platelets as identified by the binding of thiazole orange. The functional significance of COAT-FV platelets was investigated by demonstrating that factor Xa preferentially bound to COAT-FV platelets, that COAT-FV platelets had more FV activity than either thrombin or A23187–activated platelets, and that COAT-FV platelets were capable of generating more prothrombinase activity than any other physiologic agonist examined. Microparticle production by dual stimulation with thrombin and convulxin was less than that observed with A23187, indicating that microparticles were not responsible for all the activities observed. These data demonstrate a new procoagulant component produced from dual stimulation of platelets with thrombin and collagen. COAT-FV platelets may explain the unique role of -granule FV and the hemostatic effectiveness of young platelets." @default.
- W1540375091 created "2016-06-24" @default.
- W1540375091 creator A5003709857 @default.
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- W1540375091 date "2000-03-01" @default.
- W1540375091 modified "2023-09-30" @default.
- W1540375091 title "Surface expression and functional characterization of α-granule factor V in human platelets: effects of ionophore A23187, thrombin, collagen, and convulxin" @default.
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- W1540375091 doi "https://doi.org/10.1182/blood.v95.5.1694.005k24_1694_1702" @default.
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