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  • Title: The endothelial cell protein C receptor (EPCR) functions as a primary receptor for protein C activation on endothelial cells in arteries, veins, and capillaries.
    Author: Ye X, Fukudome K, Tsuneyoshi N, Satoh T, Tokunaga O, Sugawara K, Mizokami H, Kimoto M.
    Journal: Biochem Biophys Res Commun; 1999 Jun 16; 259(3):671-7. PubMed ID: 10364477.
    Abstract:
    Plasma protein C functions as an anticoagulant when it is converted to the active form of serine protease. Protein C activation has been found to be mediated by the endothelial cell surface thrombin/thrombomodulin (TM) complex. In addition, we recently identified the endothelial cell protein C/activated protein C receptor (EPCR) which is capable of high-affinity binding for protein C. In this study, we established monoclonal antibodies (mAbs) against EPCR including several function blocking antibodies. Immunohistochemical analysis using these mAbs demonstrated that EPCR is widely expressed in the endothelial cells of arteries, veins, and capillaries in the lung, heart, and skin. Function blocking anti-EPCR mAbs strongly inhibited protein C activation mediated by primary cultured arterial endothelial cells which express abundant EPCR. Anti-EPCR mAbs also prevent protein C activation mediated by microvascular endothelial cells. These results indicate that EPCR functions as an important regulator for the protein C pathway in various types of vessels.
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