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Binding of viridans group streptococci to human platelets: a quantitative analysis
P M Sullam1, D G Payan, P F Dazin
1Center for Immunochemistry, University of California, San Francisco.
Infection and Immunity
|November 1, 1990
Summary
Viridans group streptococci rapidly bind to human platelets. This specific interaction is reversible and saturable, suggesting a direct receptor-ligand mechanism between bacteria and platelets.
Area of Science:
- Microbiology
- Hematology
- Immunology
Background:
- Viridans group streptococci are common oral bacteria.
- Platelets play a crucial role in hemostasis and immune responses.
- Interactions between bacteria and platelets can influence infection pathogenesis.
Purpose of the Study:
- To investigate the binding characteristics between viridans group streptococci and human platelets.
- To determine if the binding interaction is specific and quantifiable.
Main Methods:
- Two-color flow cytometry was employed to analyze bacterial binding to platelets.
- Binding kinetics were assessed by varying bacteria-to-platelet ratios.
- Reversibility was tested by introducing unlabeled bacteria.
Main Results:
- Streptococcus-platelet binding was observed within 15 seconds.
- Binding demonstrated saturation at higher bacterial concentrations.
- The interaction was reversible upon addition of excess unlabeled bacteria, indicating specificity.
Conclusions:
- The binding of viridans group streptococci to human platelets is a rapid, reversible, and saturable process.
- These characteristics strongly suggest a specific receptor-ligand interaction.
- Understanding this interaction may offer insights into streptococcal infections and platelet function.