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The protein C pathway
1Oklahoma Medical Research Foundation, Oklahoma City 73104, USA. charles-esmon@omrf.ouhsc.edu
Objective:
To examine the role of the protein C anticoagulant pathway in the regulation of microvascular thrombosis. The mechanisms by which inflammation impairs the function of this pathway are also reviewed; conversely, we will survey emerging knowledge of the multiple mechanisms by which the protein C anticoagulant pathway can control the inflammatory response.
Data Sources:
The information reviewed here was taken from the primary literature, including recent abstracts.
Study Selection:
All studies that bear directly on the interrelationship between the protein C anticoagulant pathway and inflammation were included, as was a summary of the initial clinical experience with protein C/activated protein C therapy in sepsis.
Data Extraction And Synthesis:
The results from each of the experimental approaches are summarized. Clinical experience with protein C supplementation in sepsis, although promising, is still in the early stages of study.
Conclusions:
The protein C anticoagulant pathway is a major mechanism in controlling microvascular thrombosis. Protein C deficiency that can occur in sepsis facilitates thrombin generation in the microvasculature, probably augmenting inflammatory responses and contributing to endothelial cell dysfunction. Animal studies and preliminary clinical results suggest that protein C/activated protein C supplementation may be useful in reversing microvascular dysfunction.
Insights
The protein C anticoagulant pathway is vital for controlling microvascular thrombosis. Protein C deficiency in sepsis worsens inflammation and endothelial dysfunction, but supplementation may offer therapeutic benefits.
Area of Science:
- Biochemistry
- Hematology
- Immunology
Background:
- The protein C system is a critical regulator of blood coagulation.
- Inflammation can impair protein C anticoagulant function.
- The protein C pathway also possesses anti-inflammatory properties.
Purpose of the Study:
- To investigate the role of the protein C anticoagulant pathway in microvascular thrombosis.
- To review how inflammation affects protein C pathway function.
- To explore how the protein C pathway modulates inflammation.
Main Methods:
- Literature review of primary research.
- Inclusion of studies on the protein C pathway and inflammation.
- Summary of clinical experience with protein C therapy in sepsis.
Main Results:
- The protein C anticoagulant pathway is essential for regulating microvascular thrombosis.
- Protein C deficiency in sepsis promotes thrombin generation and inflammation.
- Preliminary data suggest protein C/activated protein C may improve microvascular function.
Conclusions:
- The protein C system plays a key role in preventing microvascular thrombosis.
- Dysfunction of the protein C pathway in sepsis contributes to thrombosis and inflammation.
- Protein C supplementation shows potential for treating sepsis-induced microvascular dysfunction.