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Human platelet activating antibodies.

D J Christie1, C D Swinehart

  • 1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455.

Seminars in Thrombosis and Hemostasis
|January 1, 1992
PubMed
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Platelet antibodies can activate or inhibit platelet function, potentially explaining thrombotic and hemorrhagic symptoms in transfused patients. This study investigated HLA and platelet-specific antibodies, revealing diverse effects on platelet activation and aggregation.

Area of Science:

  • Immunology
  • Hematology
  • Transfusion Medicine

Background:

  • Platelet antibodies are implicated in transfusion reactions.
  • Neonatal alloimmune thrombocytopenia (NAIT) and reactions in multiply transfused patients involve platelet antibodies.
  • Human Leukocyte Antigen (HLA) antibodies and platelet-specific antibodies can be present in these patient populations.

Observation:

  • Multispecific HLA antibodies and platelet-specific antibodies (anti-HPA-1a, anti-HPA-3a, anti-HPA-1b) were identified.
  • HLA antibodies induced potent platelet aggregation and ATP release.
  • Anti-HPA-1b antibodies caused agglutination but not ATP release, yet blocked subsequent ADP stimulation.

Findings:

  • HLA antibodies strongly activated platelets, causing aggregation and dense granule ATP release.

Related Experiment Videos

  • Platelet-specific anti-HPA-1b antibodies induced agglutination and inhibited subsequent platelet activation by ADP, epinephrine, and thrombin.
  • These antibodies demonstrated varied effects, including potent activation by HLA antibodies and inhibitory effects by anti-HPA-1b, impacting thrombin-induced activation.

    • Implications:

    • Transfused platelets can be either activated or inhibited by various platelet antibodies.
    • Platelet-reactive antibodies in multiply transfused patients may contribute to observed thrombotic and hemorrhagic complications.
    • Understanding these antibody-mediated effects is crucial for managing transfusion-related complications.