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Influence of the surface on thrombin generation
1Department of Clinical Chemistry, University Hospital Giessen/Marburg, Germany. thstief@med.uni-marburg.de
International Journal of Laboratory Hematology
|July 31, 2008
Summary
A new assay quantifies surface-dependent thrombin generation, revealing that materials like glass and polystyrene significantly increase thrombin activity. Hemolysis and temperature also impact blood clotting potential.
Area of Science:
- Biochemistry
- Hematology
- Materials Science
Background:
- Thrombin generation is crucial for blood coagulation and is influenced by various factors.
- The surface properties of blood-contacting materials can significantly affect thrombin activity.
- Existing assays may not fully capture surface-dependent thrombin generation dynamics.
Purpose of the Study:
- To develop and validate an ultra-sensitive and specific thrombin assay for quantifying surface-dependent thrombin generation.
- To investigate the impact of different materials, preincubation conditions, and hemolysis on thrombin generation.
- To assess the prothrombotic potential of various materials using the developed assay.
Main Methods:
- Development of the recalcified coagulation activity assay (RECA) for measuring thrombin generation.
- Preincubation of citrated blood or plasma with various materials (glass, polypropylene, polystyrene) at different temperatures.
- Quantification of thrombin activity using a chromogenic substrate and measurement of absorbance change over time.
Main Results:
- Significant variations in thrombin generation were observed based on the material surface, with glass and polystyrene showing higher activity compared to polypropylene.
- Preincubation temperature and the presence of hemoglobin-erythrocyte microparticles (Hb-MP) due to hemolysis proportionally influenced thrombin generation.
- Whole blood generated substantially more thrombin than plasma under similar conditions.
Conclusions:
- The RECA assay effectively quantifies surface-dependent thrombin generation, highlighting the critical role of material interactions.
- Material surface, temperature, and hemolysis are key determinants of prothrombotic potential.
- This assay can be utilized to diagnose the prothrombotic capacity of biomaterials and medical devices.
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