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- W2413062223 abstract "Summary The effect of thrombin on the fibrinolytic potential of human vascular smooth muscle cells (SMC) in culture was studied. SMC of different origin responded to thrombin treatment with a dose and time dependent increase in tissue-type plasminogen activator (t-PA) and plasminogen activator inhibitor type-1 (PAI-1) levels in both cell lysates and conditioned media with maximum effects achieved at 10-20 IU/ml thrombin. PAI-1 antigen levels also increased in the extracellular matrix of thrombin treated SMC. PAI-2 levels in cell lysates of such SMC were not affected by thrombin. The effect was restricted to active thrombin, since DFP-thrombin and thrombin treated with hirudin showed no increasing effect on t-PA and PAI-1 levels in SMC. Enzymatically active thrombin also caused a four-fold increase in specific PAI-1 mRNA and a three-fold increase in t-PA mRNA. Furthermore we demonstrated the presence of high and low affinity binding sites for thrombin on the surface of SMC with a K D = 4.3 × 10−10 M and 9.0 × 104 sites per cell and a KD = 0.6 × 10−8 M and 5.8 × 105 sites per cell respectively. Thrombin could come in contact with SMC in case of vascular injury or following gap formation between endothelial cells. Our data support the idea that besides its known proliferative effect for SMC, thrombin could also modulate their fibrinolytic system." @default.
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- W2413062223 date "1993-01-01" @default.
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- W2413062223 title "Thrombin Stimulates Expression of Tissue-Type Plasminogen Activator and Plasminogen Activator lnhibitor Type 1 in Cultured Human Vascular Smooth Muscle Cells" @default.
- W2413062223 doi "https://doi.org/10.1055/s-0038-1649607" @default.
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