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Antigen expression of frozen platelets.

M P Chow1, H Y Hu, J L Tzeng

  • 1Department of Medicine, Veterans General Hospital, Taipei, Taiwan, Republic of China.

Clinical and Laboratory Haematology
|January 1, 1992
PubMed
Summary

Frozen platelets retain detectable A, B, PLA1 (HPA-1a), and HLA antigens for up to one month. Antigen expression on frozen platelets is stable within this period, suggesting suitability for platelet crossmatching.

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Area of Science:

  • Immunology
  • Transfusion Medicine
  • Hematology

Background:

  • Platelet antigen expression is crucial for transfusion compatibility.
  • Cryopreservation of platelets is a method for long-term storage.
  • Understanding antigen stability post-cryopreservation is vital for clinical applications.

Purpose of the Study:

  • To evaluate the stability of platelet antigens after cryopreservation.
  • To determine the optimal storage duration for frozen platelets regarding antigenicity.
  • To assess the feasibility of using frozen platelets for crossmatching.

Main Methods:

  • Platelet samples from 36 donors were cryopreserved for varying intervals.
  • Platelet suspension immunofluorescence test (PSIFT) was employed.

Related Experiment Videos

  • Detection of A, B, PLA1 (HPA-1a), and HLA antigens was performed using specific antisera.

    • Main Results:

    • Platelet antigens were detectable in nearly all samples after one month of freezing.
    • Antigen detection rates decreased significantly to 29.2% at 3 months and 3.7% at 6 months.
    • No significant difference in antigen decay was observed among A, B, PLA1, and HLA antigens.
    • Frozen platelets showed enhanced antigen expression between 2 to 4 weeks of storage compared to fresh platelets.

    Conclusions:

    • Cryopreserved platelets maintain antigenicity for up to one month.
    • Frozen platelets are suitable for platelet crossmatching procedures within the first month of storage.
    • Further research may explore optimized cryopreservation protocols to extend antigen stability.