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Maximum fluid concentrations of materials released from platelets at a surface.
The American Journal of Physiology
|January 1, 1983
Summary
This study quantifies local concentrations of platelet-released substances near collagen surfaces. Adenosine 5'-diphosphate (ADP) concentrations were found sufficient to influence platelet aggregation, unlike other tested substances.
Area of Science:
- Biomedical Engineering
- Hematology
- Biophysics
Background:
- Platelet aggregation is crucial for hemostasis and thrombosis.
- Understanding the local microenvironment during platelet activation is key to elucidating aggregation mechanisms.
Purpose of the Study:
- To estimate the interfacial fluid concentration (IFC) of substances released by platelets.
- To determine which released substances, at their local concentrations, could influence platelet aggregation.
Main Methods:
- Platelet/red blood cell suspensions perfused through a tube with collagen-coated glass.
- Calculation procedure based on diffusion and convection to determine upper bound IFC.
- Measured platelet accumulation rate and maximum releasable material.
Main Results:
- IFC is dependent on shear rate (G), proportional to G0.27.
- Serotonin, AMP, ATP, pyrophosphate, fibrinogen, fibronectin, vWF, and calcium had insufficient IFCs to affect aggregation.
- Adenosine 5 -diphosphate (ADP) alone exhibited an IFC sufficient to influence platelet aggregation.
Conclusions:
- Local ADP concentration is a significant factor in platelet aggregation.
- Other platelet-secreted substances, at typical release levels, may not independently drive aggregation.
- Further research is needed on arachidonic acid metabolites' role in platelet aggregation.