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- W2020648175 abstract "Platelet adhesion to synthetic surfaces that come in contact with blood is mediated by the adsorption of adhesive plasma proteins, especially fibrinogen. However, the roles of other adhesive proteins, such as fibronectin, vitronectin, and von Willebrand factor in platelet adhesion are not yet clear. In this study, the role of fibronectin in platelet adhesion to surfaces was assessed using three approaches. First, platelet adhesion was measured on Immulon I® preadsorbed with fibronectin-depleted plasma or fibronectin-depleted plasma replenished with increasing amount of fibronectin. Under these conditions, fibronectin adsorbed from plasma did not have any effect on platelet adhesion, while fibrinogen played a major role in mediating platelet adhesion. Since fibronectin might play a role in platelet adhesion to surfaces which adsorb little or no fibrinogen, we also used two other strategies to assess the potential role of fibronectin. One was to use platelets treated with a platelet activation inhibitor, prostaglandin E1, which prevents the activation of platelet fibrinogen receptor GP IIb/IIIa. The adhesion of prostaglandin E1-treated platelets to Immulon I® preadsorbed with plasma was greatly decreased compared to that of untreated platelets, but was increased by the addition of supernormal concentrations of fibronectin to the plasma. This suggests that GP Ic/IIa, rather than GP IIb/IIIa, might be the platelet receptor which is responsible for platelet adhesion to surface-bound fibronectin. Finally, we studied the effect of fibronectin on platelet adhesion to surfaces preadsorbed with fibronectin-depleted afibrinogenemic plasma. We found that fibronectin re-addition to fibronectin-depleted atibrinogenemic plasma increased platelet adhesion. However, our most important finding was that fibronectin seems to play little or no role in mediating platelet adhesion to polystyrene surfaces preadsorbed with normal plasma." @default.
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- W2020648175 title "The role of fibronectin in platelet adhesion to plasma preadsorbed polystyrene" @default.
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- W2020648175 doi "https://doi.org/10.1163/156856299x00117" @default.
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