<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Protein C is a vitamin K-dependent serine protease secreted by the hepatocytes as an inactive zymogen and activated by thrombin bound to endothelial thrombomodulin. An endothelial protein C receptor (EPCR) is involved in both activation and enhancement of protein C activity, resulting in proteolytic degradation of clotting factors Va and VIIIa, thereby providing an efficient anticoagulant mechanism. Evidence was also provided that proinflammatory cytokines would impair the endothelia-mediated activation and activity of the Protein C system by inducing an internalization and proteolytic degradation of thrombomodulin and by shedding EPCR from the surface of endothelial cells membrane. Clinical and experimental studies also emphasized that an inflammatory acute phase reaction is accompanied by a commuted hepatic protein synthesis leading to an increase of plasma fibrinogen, factor VIII:C and of α1 protease inhibitor, while the plasma level of protein C zymogen decrease. On the other hand infusions of activated protein C were reported to protect from a toxico-septic shock by exerting not only anticoagulant but also anti-inflammatory effects.</p></abstract>

Protein C is a vitamin K-dependent serine protease secreted by the hepatocytes as an inactive zymogen and activated by thrombin bound to endothelial thrombomodulin. An endothelial protein C receptor (EPCR) is involved in both activation and enhancement of protein C activity, resulting in proteolytic degradation of clotting factors Va and VIIIa, thereby providing an efficient anticoagulant mechanism. Evidence was also provided that proinflammatory cytokines would impair the endothelia-mediated activation and activity of the Protein C system by inducing an internalization and proteolytic degradation of thrombomodulin and by shedding EPCR from the surface of endothelial cells membrane. Clinical and experimental studies also emphasized that an inflammatory acute phase reaction is accompanied by a commuted hepatic protein synthesis leading to an increase of plasma fibrinogen, factor VIII:C and of α1 protease inhibitor, while the plasma level of protein C zymogen decrease. On the other hand infusions of activated protein C were reported to protect from a toxico-septic shock by exerting not only anticoagulant but also anti-inflammatory effects.

Reciprocal antagonism between inflammation and the protein C system

University of Medicine and Pharmacy “Iuliu Hatieganu” Department of Clinical Biochemistry str. Donath 23, bloc MX3, ap. 3, 400290, Cluj Napoca, Romania Tel: 0264 585219, Fax: 0264-598606

University of Medicine and Pharmacy “Iuliu Hatieganu” Department of Clinical Biochemistry

University of Medicine and Pharmacy “Iuliu Hatieganu” Department of Pathophysiology

Central Laboratory of the Cluj County Hospital

University of Medicine and Pharmacy “Iuliu Hatieganu” Department of Clinical Hematology

Revista Romana de Medicina de Laborator

{"article-title":"Reciprocal antagonism between inflammation and the protein C system"}

Protein C is a vitamin K-dependent serine protease secreted by the hepatocytes as an inactive zymogen and activated by thrombin bound to endothelial...

Reciprocal antagonism between inflammation and the protein C system

Publié en ligne: 21 juin 2013

Pages: 129 - 133

DOI: https://doi.org/10.2478/rrlm-2013-0003

This content is open access.