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This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Taylor, F. B. Articles by Esmon, C. T. Search for Related Content PubMed PubMed Citation Articles by Taylor, F. B., Jr Articles by Esmon, C. T. Related Collections Hemostasis, Thrombosis, and Vascular Biology Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 15 March 2001, Vol. 97, No. 6, pp. 1685-1688 HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Endothelial cell protein C receptor plays an important role in protein C activation in vivo Fletcher B. Taylor Jr, Glenn T. Peer, Marion S. Lockhart, Gary Ferrell, and Charles T. Esmon From the Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation; Departments of Pathology and Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center; and Howard Hughes Medical Institute, Oklahoma City, Oklahoma. Endothelial cell protein C receptor (EPCR) augments protein C activation by the thrombin-thrombomodulin complex about 5-fold in vitro. Augmentation is EPCR concentration dependent even when the EPCR concentration is in excess of the thrombomodulin. EPCR is expressed preferentially on large blood vessel endothelium, raising questions about the importance of protein C-EPCR interaction for augmenting systemic protein C activation. In these studies, this question was addressed directly by infusing thrombin into baboons in the presence or absence of a monoclonal antibody to EPCR that blocks protein C binding. Activated protein C levels were then measured directly by capturing the enzyme on a monoclonal antibody and assaying with chromogenic substrate. Blocking protein C-EPCR interaction resulted in about an 88% decrease in circulating activated protein C levels generated in response to thrombin infusion. Leukocyte changes, fibrinogen consumption, fibrin degradation products, and vital signs were similar between the animals infused with thrombin alone and those infused with thrombin and the anti-EPCR antibody. The results indicate that EPCR plays a major role in protein C activation and suggest that defects in the EPCR gene might contribute to increased risk of thrombosis. © 2001 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: J. H. Finigan, A. Boueiz, E. Wilkinson, R. Damico, J. Skirball, H. H. Pae, M. Damarla, E. Hasan, D. B. Pearse, S. P. Reddy, et al. 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	Copyright © 2001 by American Society of Hematology         Online ISSN: 1528-0020