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[Analysis of immunoglobulin classes of five anti-phospholipid antibodies in sera from patients with SLE, ITP and recurrent fetal abortion by enzyme linked immunosorbent assay].

Using a panel of phospholipid(PL) antigens, we have established an enzyme linked immunosorbent assay (ELISA) for measuring both IgG and IgM type anti-phospholipid antibodies (APA) in sera from patients with systemic lupus erythematosus (SLE), idiopathic thrombocytopenic purpura (ITP) and recurrent fetal abortion (RFA). The percentage of anticardiolipin antibody (aCL) positive patients was increased in SLE (73% for IgG, 74% for IgM), ITP (24% for IgG, 8% for IgM) and RFA (20% for IgG, 52% for IgM) as compared with normal controls. The percentage of other APAs in each disease was significantly different from one another, suggesting the existence of disease-specific APA in these autoimmune disorders. We consider that it is important to analyze these APAs for the investigation of pathogenesis of autoimmune disorders.