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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
PubMed
Summary
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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.

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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.