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Related Experiment Videos

Membrane glycoproteins in cryopreserved platelets

M Owens1, E Werner, S Holme

  • 1Eastern Virginia Medical School, Department of Medicine, Norfolk.

Vox Sanguinis
|January 1, 1994
PubMed
Summary

Cryopreserved platelets show reduced adhesion and aggregation due to modest loss of surface glycoprotein GPIb. This defect, though minor, impacts platelet function post-storage, necessitating further investigation into cryopreservation

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Area of Science:

  • Hematology
  • Transfusion Medicine
  • Biochemistry

Background:

  • Platelets are crucial for hemostasis but acquire functional defects after cryopreservation.
  • Known defects include impaired aggregation and altered morphology.
  • Cryopreserved platelets exhibit decreased adhesion to subendothelium compared to liquid-stored platelets.

Purpose of the Study:

  • To investigate the molecular basis for decreased adhesive capacity in cryopreserved platelets.
  • To quantify the expression of key platelet glycoproteins, GPIb and GPIIb/IIIa, after cryopreservation.
  • To assess the functional capacity of cryopreserved platelets using aggregation assays.

Main Methods:

  • Flow cytometry was used to measure surface expression of GPIb and GPIIb/IIIa on fresh and cryopreserved platelets.

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  • Platelet aggregation was analyzed in response to ristocetin and thrombin.
  • Cryopreservation was performed using 5% DMSO as a cryoprotectant.

    • Main Results:

    • Approximately 15% of cryopreserved platelets showed a loss of surface-bound GPIb.
    • No significant loss of GPIIb/IIIa was detected after cryopreservation.
    • Cryopreserved platelets exhibited reduced aggregation in response to ristocetin but maintained response to thrombin.

    Conclusions:

    • The modest loss of surface GPIb on cryopreserved platelets does not fully explain the observed functional deficits in adhesion and aggregation.
    • Further research is needed to identify other contributing factors to cryopreserved platelet dysfunction.
    • Understanding these defects is crucial for optimizing platelet storage and transfusion efficacy.