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Human platelet electrorotation change induced by activation: inducer specificity and correlation to serotonin release
M Egger1, E Donath, P Spangenberg
1Sektion Biologie, Bereich Biophysik, Humboldt-Universität zu Berlin, G.D.R.
Biochimica Et Biophysica Acta
|December 9, 1988
Summary
Electrorotation measurements reveal significant changes in platelet membrane conductivity upon activation. This technique offers a time-dependent method for assessing platelet activation by various agents.
Area of Science:
- Biophysics
- Hematology
- Cell Biology
Background:
- Platelet activation is crucial for hemostasis and thrombosis.
- Understanding platelet activation mechanisms requires precise measurement techniques.
- Electrorotation offers a biophysical approach to study cellular changes.
Purpose of the Study:
- To investigate the correlation between platelet electrorotation and activation markers.
- To characterize the biophysical changes in platelet membranes during activation.
- To establish electrorotation as a method for time-dependent platelet activation analysis.
Main Methods:
- Single platelet electrorotation measurements.
- Comparison with [14C]serotonin release, aggregation assays, and electron microscopy.
- Platelet activation induced by various agonists including thrombin, ADP, and PAF.
Main Results:
- A strong correlation was observed between decreased electrorotation and serotonin release.
- Electrorotation changes did not correlate with platelet aggregation.
- Platelet activation caused a significant increase in membrane specific conductivity.
- Time-dependent activation measurements revealed characteristic times in the order of minutes.
Conclusions:
- Electrorotation is a sensitive technique for detecting platelet activation.
- Changes in membrane conductivity are a key biophysical event during platelet activation.
- The study provides a sequence of activators based on their activation time constants.