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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Antibodies against platelet glycoproteins and antiphospholipid antibodies in autoimmune thrombocytopenia.
European Journal of Haematology 1998 May
Autoantibodies against platelet glycoproteins (anti-GP) are found in the majority of patients with autoimmune thrombocytopenia (AITP) as well as in thrombocytopenia associated with systemic lupus erythematosus (SLE). Some of these patients may have anti-phospholipid antibodies (anti-PL). To evaluate the pathogenetic significance of anti-PL and anti-GP antibodies in AITP and SLE patients, we investigated anti-cardiolipin (anti-CL), anti-phosphatidylserine (anti-PS) and anti-GP antibodies (anti-GPIIb-IIIa and anti-GPIb-IX) in 71 patients with AITP and 3 thrombocytopenic patients with SLE. Anti-GP antibodies were detected in 52 (70%) patients. Fifty-six (73%) patients showed anti-PL antibodies. Seven patients (6 AITP, 1 SLE) with both anti-GPIIb-IIIa and IgG anti-PL antibodies were followed during treatment with corticosteroids. Antibodies were measured before treatment and at the time of platelet-peak. Anti-GPIIb-IIIa antibodies decreased in all or became undetectable in five. In contrast, IgG anti-PS and IgG anti-CL antibodies decreased only moderately or remained positive. Adsorption experiments, using gelfiltered platelets, erythrocyte (Ec)-inside-out-vesicles and purified GPIIb-IIIa, showed that anti-GP and anti-PL antibodies have distinct specificities and do not crossreact. We conclude that anti-PL and anti-GP antibodies may be present simultaneously in some patients with immune mediated thrombocytopenia. Although anti-PS as well as anti-CL antibodies may be responsible for thrombocytopenia, we speculate that anti-GPIIb-IIIa antibodies are more related to the severity of thrombocytopenia.
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