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Membrane reorganization during chilling: implications for long-term stabilization of platelets
F Tablin1, W F Wolkers, N J Walker
1Biostabilization Program, University of California, Davis, CA 95616, USA.
Cryobiology
|February 16, 2002
Summary
Platelet activation during cold storage is linked to membrane changes like raft aggregation and phase separation. Preventing these biophysical events is crucial for stabilizing platelets for frozen or dry storage.
Area of Science:
- Biophysics
- Biochemistry
- Hematology
Background:
- Platelet activation is a complex process.
- Cold exposure can induce undesirable platelet activation.
- Understanding the mechanisms of cold-induced platelet activation is vital for transfusion medicine.
Purpose of the Study:
- To review the biophysical and biochemical factors causing platelet cold-induced activation.
- To elucidate the role of membrane domain formation and phase separation in this process.
- To identify strategies for stabilizing platelets during cold storage.
Main Methods:
- Review of existing literature on platelet biophysics and biochemistry.
- Analysis of evidence regarding membrane domain aggregation during chilling.
- Examination of data on lateral phase separation in stored platelet membranes.
Main Results:
- Chilling and storage lead to the formation of large membrane domains (raft aggregates) in platelets.
- Prolonged cold storage induces lateral phase separation in platelet membranes.
- Raft aggregation and lateral phase separation are identified as critical events in cold-induced platelet activation.
Conclusions:
- Raft aggregation and lateral phase separation are key mechanisms of cold-induced platelet activation.
- Obviating these membrane events is essential for stabilizing platelets.
- Stabilization strategies are needed for effective frozen or dry platelet storage.