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Intracellular function in rehydrated lyophilized platelets.
T H Fischer1, E P Merricks, K E Russell
1Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, 27599, USA. tfischer@med.unc.edu
British Journal of Haematology
|November 25, 2000
Summary
Rehydrated, lyophilized platelets retain key functions for transfusion. These platelets show enhanced protein phosphorylation and support coagulation, indicating potential as a platelet substitute.
Area of Science:
- Biomedical Engineering
- Hematology
- Cellular Biology
Background:
- Platelets are crucial for hemostasis and thrombosis.
- Current limitations exist in platelet storage and availability for transfusion.
- Lyophilized platelets are being developed as a potential platelet substitute.
Purpose of the Study:
- To evaluate the impact of cross-linking and lyophilization on intracellular signaling in rehydrated, lyophilized (RL) platelets.
- To assess the functional capacity of RL platelets as a substitute for fresh platelets.
Main Methods:
- RL platelets were exposed to thrombin to assess protein phosphorylation.
- Intracellular nucleotide levels (ADP, ATP) were measured.
- Surface membrane permeability was evaluated using nucleotide probes of varying sizes.
Main Results:
- Thrombin stimulation induced enhanced phosphorylation of specific proteins (18 kDa and 42 kDa kinase substrates) in RL platelets.
- Cross-linking and lyophilization reduced free cytoplasmic ADP and ATP but minimally affected protein-bound nucleotides.
- RL platelet membranes showed selective permeability, allowing probes <3 kDa to penetrate.
Conclusions:
- RL platelets retain essential hemostatic stimulus-response functions.
- These platelets demonstrate capacity for feedback amplification in coagulation.
- RL platelets show promise as a functional substitute for fresh platelets in transfusion medicine.