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The Protein C Pathway

Esmon, Charles T.·2003·Chest
DOI 10.1378/chest.124.3_suppl.26s
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Abstract

The protein C anticoagulant pathway serves as a major system for controlling thrombosis, limiting inflammatory responses, and potentially decreasing endothelial cell apoptosis in response to inflammatory cytokines and ischemia. The essential components of the pathway involve thrombin, thrombomodulin, the endothelial cell protein C receptor (EPCR), protein C, and protein S. Thrombomodulin binds thrombin, directly inhibiting its clotting and cell activation potential while at the same time augmenting protein C (and thrombin activatable fibrinolysis inhibitor [TAFI]) activation. Furthermore, thrombin bound to thrombomodulin is inactivated by plasma protease inhibitors > 20 times faster than free thrombin, resulting in increased clearance of thrombin from the circulation. The inhibited thrombin rapidly dissociates from thrombomodulin, regenerating the anticoagulant surface. Thrombomodulin also has direct anti-inflammatory activity, minimizing cytokine formation in the endothelium and decreasing leukocyte-endothelial cell adhesion. EPCR augments protein C activation approximately 20-fold in vivo by binding protein C and presenting it to the thrombin-thrombomodulin activation complex. Activated protein C (APC) retains its ability to bind EPCR, and this complex appears to be involved in some of the cellular signaling mechanisms that down-regulate inflammatory cytokine formation (tumor necrosis factor, interleukin-6). Once APC dissociates from EPCR, it binds to protein S on appropria…

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Research works printed but not linked: 54

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Metadata

Authors
Esmon, C. T.
Venue
Chest
Publisher
Elsevier BV
Published
2003-09
Volume
124
Issue
3
Pages
26S-32S
ISSN
0012-3692
DOI
10.1378/chest.124.3_suppl.26s
Cited by
719
References
0
Language
en
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CoChat. (2026). Citation check: The Protein C Pathway. https://app.cochat.ai/papers/10.1378/chest.124.3_suppl.26s
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Esmon, C. T. (2003). The Protein C Pathway. Chest. https://doi.org/10.1378/chest.124.3_suppl.26s