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- W54188002 abstract "Hemodynamic forces modulate various endothelial cell functions even in the presence of cytokines under gene regulation. We have investigated the effect of shear stress on the coagulation and fibrinolysis systems in cultured human umbilical vein endothelial cells (HUVECs) perturbed by cytokines, using modified cone-plate viscometer. Thrombomodulin (TM), a surface glycoprotein receptor for thrombin that catalyzes the activation of the protein C anticoagulant pathway, and tissue factor (TF), a transmembrane glycoprotein that plays a central role in blood coagulation, are important regulators for coagulation in endothelium. Shear stress of 18 dynes/cm2 increased the expression of TM either in the presence or absence of TNF alpha (100 U/ml). In contrast, shear stresses of 6 approximately 24 dynes/cm2 decreased the expression of TNF alpha-induced TF in a shear intensity- and exposure time- dependent manner Tissue plasminogen activator(t-PA), which converts plasminogen to plasmin to degrade fibrin clot, and plasminogen activator inhibitor-1 (PAI-1), which inhibits t-PA function, play central roles in fibrinolysis in the endothelium. Treatment of the cells with IL-1 beta or TNF-alpha under static conditions had no effect on t-PA secretion, while release of PAI-1 increased. When cells were exposed to increasing shear stress up to 24 dynes/cm2, levels of t-PA significantly increased relative to shear stress, while PAI-1 secretion decreased gradually. In the presence of IL-1 beta or TNF-alpha, the increased production of t-PA was further augmented. These results clearly indicate that shear forces act as an important regulators of the coagulation and fibrinolysis systems in endothelium, to maintain antithrombogenicity of blood vessels." @default.
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- W54188002 date "1997-04-01" @default.
- W54188002 modified "2023-09-23" @default.
- W54188002 title "[Regulation of antithrombogenicity in endothelium by hemodynamic forces]." @default.
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