Abstract
In this study we demonstrate that prothrombin activates the cell proliferation of the lung adenocarcinoma A549 cells. The A549 cell expresses factor Xa-like prothrombinase activity on its surface and prothrombin was converted to thrombin on the cell surface. Furthermore, thrombin induced the activation of PKC, increased [Ca 2+] i and potentiated MAP kinase activity through thrombin receptor. The mitogenic activity of prothrombin and the conversion to thrombin were completely abolished by the synthetic coagulation factor Xa inhibitor, DX9065a. These findings suggest that DX9065a is an effective agent for a therapeutic strategy against cancer itself and prothrombotic complications associated with malignancy.
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