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Procoagulant protein levels are differentially increased during human endotoxemia
P H Reitsma1, J Branger, B Van Den Blink
1The Laboratory for Experimental Internal Medicine, and The Department of Vascular Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands. p.h.reitsma@amc.uva.nl
Journal of Thrombosis and Haemostasis : JTH
|July 23, 2003
Summary
Inflammation may increase venous thrombosis risk by elevating coagulation factors like Factor VIII and Factor IX. This study shows endotoxin rapidly increases these factors, suggesting an inflammatory link to thrombosis risk.
Area of Science:
- Hematology
- Immunology
- Thrombosis Research
Background:
- Plasma interleukin levels suggest inflammation contributes to venous thrombotic disease risk.
- Elevated coagulation factors (FVIII, FIX, FX, FXI) are known risk indicators for venous thrombosis, but the underlying cause is unclear.
Purpose of the Study:
- To investigate if elevated coagulation factor levels during inflammation are an inflammatory response.
- To measure coagulation factor levels in male volunteers during experimental human endotoxemia.
Main Methods:
- Male volunteers received endotoxin (4 ng kg-1).
- Plasma samples were collected pre- and post-endotoxin challenge.
- A panel of coagulation tests, including antigen levels of FVIII, von Willebrand factor (VWF), FIX, FX, FXI, fibrinogen, and FVII, were performed.
Main Results:
- Endotoxin administration rapidly increased FVIII, VWF, FIX, and FX antigen levels, peaking within 2-5 hours.
- FVIII and VWF levels remained elevated (>200%) at 24 hours, while FIX and FX normalized.
- Fibrinogen and FXI levels increased more slowly and did not normalize within the observation period.
- FVII levels were significantly depressed.
Conclusions:
- Coagulation factors FVIII, FIX, and FX show an immediate and strong response to endotoxin, distinct from the slower acute-phase response of FXI and fibrinogen.
- These findings support the hypothesis that inflammation can directly elevate coagulation factor levels, providing a mechanism for their role as risk indicators in venous thrombotic disease.