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Human platelets loaded with trehalose survive freeze-drying.

W F Wolkers1, N J Walker, F Tablin

  • 1Section of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA. wfwolkers@ucdavis.edu

Cryobiology
|July 13, 2001
PubMed
Summary

Human blood platelets can now be preserved through freeze-drying with trehalose, a sugar that aids survival. This innovative method significantly extends platelet viability, addressing chronic shortages and aiding patients requiring transfusions.

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Area of Science:

  • Biotechnology
  • Hematology
  • Biochemistry

Background:

  • Human blood platelets have a short 5-day storage limit due to federal regulations.
  • This limited shelf-life causes chronic platelet shortages, especially impacting immunocompromised patients.
  • Current storage limitations hinder effective transfusion strategies.

Purpose of the Study:

  • To investigate the preservation of human blood platelets using freeze-drying with trehalose.
  • To assess the efficiency of trehalose uptake by platelets and the subsequent viability after freeze-drying and rehydration.
  • To evaluate the functional recovery and structural integrity of preserved platelets.

Main Methods:

  • Human platelets were loaded with trehalose at 37°C, with uptake mechanisms including fluid-phase endocytosis.

Related Experiment Videos

  • Trehalose-loaded platelets underwent freeze-drying and subsequent rehydration from the vapor phase.
  • Platelet function was assessed using agonists (thrombin, collagen, ADP, ristocetin), and structural integrity was analyzed via Fourier transform infrared spectroscopy.

    • Main Results:

    • Trehalose demonstrated high uptake efficiency (≥50%) in human platelets.
    • Freeze-dried, trehalose-loaded platelets showed excellent recovery and an 85% survival rate after rehydration.
    • Preserved platelets exhibited functional responses to agonists nearly identical to fresh platelets.
    • Fourier transform infrared spectroscopy confirmed remarkable similarity in membrane and protein components between preserved and fresh platelets.

    Conclusions:

    • Freeze-drying human platelets with trehalose is a viable method for long-term preservation.
    • This technique effectively overcomes the short storage-life limitations of platelets.
    • The findings suggest a potential solution to chronic platelet shortages, improving transfusion availability.