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Platelet autoantigens: Identification and characterization using immunoblotting

  • Proceedings Of The International Workshop On ITP
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Summary

Antiplatelet autoantibodies are important in the etiology of idiopathic (or immune) thrombocytopenic purpura (ITP). Studies using immunoblotting techniques have been helpful in identifying the antigenic target proteins for the antibodies. Antibodies against the glycoprotein (GP) IIIa portion of the GPIIb/IIIa complex were the first to be demonstrated by this approach. Similar GPIIIa autoantigens have also been found to be the most frequent targets of ITP antibodies. Not all anti-GPIIIa antibodies are directed against the same epitope on GPIIIa. A subset of anti-GPIIIa antibodies found in patients with an acquired qualitative platelet dysfunction actually interfere with fibrinogen binding to normal platelets. Antibodies directed against targets on GPV have been found in patients with acute ITP of childhood. In patients with ITP associated with lupus erythematosus, antibodies which bind to intracellular proteins of apparent molecular weights of 66 and 108 kDa have been detected. Thus, ITP antibodies can have a variety of target antigens. Study of larger series of patients will determine whether identification of platelet autoantigens correlates with clinical course of ITP.

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  1. Department of Pediatrics, Yale University School of Medicine, 333 Cedar Street, 06510, New Haven, CT, USA

    Diana S. Beardsley

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  1. Diana S. Beardsley
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Beardsley, D.S. Platelet autoantigens: Identification and characterization using immunoblotting. Blut 59, 47–51 (1989). https://doi.org/10.1007/BF00320248

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  • DOI: https://doi.org/10.1007/BF00320248

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