Antiplatelet glycoprotein autoantibodies in patients with autoimmune diseases with and without thrombocytopenia

I. Cordiano, F. Salvan, M. L. Randi, M. A. Ruffatti, A. Steffan, A. Girolami, F. Fabris

Research output: Contribution to journalArticlepeer-review


The presence and specificity of antiplatelet autoantibodies in 32 patients with primary and 18 patients with secondary autoimmune thrombocytopenic purpura (AITP), as well as 11 non-thrombocytopenic patients with systemic autoimmune diseases, were studied. By means of the direct and indirect monoclonal antibody immobilization of platelet antigen (MAIPA) assay, antiplatelet autoantibodies were detected using monoclonal antibodies specific for platelet glycoproteins (GPs) Ib, IIb/IIIa, Ia/IIa, and IV. Serum antiplatelet autoantibodies were found in 18 of 32 primary AITP patients (56%), 6 of 18 secondary AITP patients (33%), and 5 of 11 non-thrombocytopenic patients (45%). Platelet-associated autoantibodies were detected in five of eight patients with primary (62%) and in four of eight patients with secondary AITP (50%) and in two of four patients without thrombocytopenia (50%). Multiple antibody reactivity, mainly against GPs IIb/IIIa and Ib and, in a few patients, against Ia/IIa, was found. Using MAIPA, platelet xylene eluates from 20 patients were also studied. Antiplatelet elutable autoantibodies were related to thrombocytopenia; autoantibodies against membrane GPs Ib and IIb/IIIa were demonstrable in 84 and 63% of eluates from patients with primary and secondary AITP, respectively, but not in eluates from non-thrombocytopenic patients. The presence of antiplatelet antibodies thus appears to be a common feature of many autoimmune diseases apart from the thrombocytopenia, but the (primary or secondary) etiology of the immune thrombocytopenia cannot be differentiated on the grounds of their specificity.

Original languageEnglish
Pages (from-to)340-347
Number of pages8
JournalJournal of Clinical Immunology
Issue number6
Publication statusPublished - 1996


  • Antiplatelet autoantibodies
  • Autoimmune thrombocytopenia
  • Monoclonal antibody immobilization of platelet antigens
  • Platelet glycoproteins

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy


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