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A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium
Published on: November 21, 2014
Molecular exchange between blood and in vitro thrombi
Haemostasis
|January 1, 1984
Summary
Radioiodinated Lys-plasminogen (125I-PLG) and albumin (125I-ALB) showed slow release from thrombi, unlike rapidly released tritiated water (3H-H2O). This indicates thrombi are dynamic, exchanging molecules with blood.
Area of Science:
- Biochemistry
- Hematology
- Physiology
Background:
- Thrombi are complex structures formed during hemostasis.
- Understanding molecular exchange within thrombi is crucial for thrombosis research.
Purpose of the Study:
- To investigate the uptake and release kinetics of different sized molecules by in vitro thrombi.
- To assess the dynamic nature of thrombi in a blood perfusion system.
Main Methods:
- In vitro thrombi were formed or preformed and exposed to radioiodinated Lys-plasminogen (125I-PLG), albumin (125I-ALB), and tritiated water (3H-H2O).
- Radioisotope uptake and subsequent release into a non-radioactive blood perfusion medium were monitored over 120 minutes.
Main Results:
- Tritiated water (3H-H2O) rapidly reached equilibrium, indicating free diffusion.
- 125I-PLG and 125I-ALB showed slower release, with 125I-PLG retention consistent with high fibrin binding.
- 125I-ALB release was intermediate, suggesting size and binding affinity influence exchange.
Conclusions:
- Thrombi are not static but exist in a dynamic state of molecular flux.
- There is a continuous exchange of molecules between the thrombus interstitial compartment and circulating blood.
- Molecular retention within thrombi is influenced by size and specific binding interactions, such as plasminogen-fibrin affinity.
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