title: The correlation between lupus anticoagulant and autoantibodies.
abstract: The presence of a positive lupus anticoagulant (LA) has recently been associated with reproductive failure. LA positivity and reproductive failure have also been associated with autoantibody abnormalities, especially antiphospholipid autoantibodies. Because the correlation between LA and autoantibody positivity has remained controversial, we retroactively investigated 326 sera of patients with reproductive failure for correlation between lupus anticoagulant and 15 autoantibodies separately for IgG, IgM, and IgA isotypes. LA by TTI and APTT correlated significantly (p less than 0.0001). Among 18 antiphospholipid isotypes, 6 (33%) correlated significantly with TTI, 5 (28%) with APTT, and 3 (17%) both with TTI and APTT. Among 15 isotypes to histone subfractions, 4 (27%) correlated significantly to TTI, 3 (20%) to APTT, and 2 (13%) to both LA assay methods. Of 12 isotypes to antipolynucleotide antibodies, 2 (17%) correlated significantly to TTI, 1 (8%) to APTT, and none to both assay methods. The correlation between LA and autoantibodies was less striking among LA-positive than LA-negative sera. LA by both TTI and APTT was primarily found to correlate with IgG and IgA autoantibodies. This occurs in decreasing frequency to phospholipids, histones, and polynucleotides. At abnormal levels of LA (by either method) the correlation with autoantibody levels is less pronounced and appears closer with IgM autoantibodies to histones and polynucleotides than antibodies to phospholipids. We conclude that the correlation between LA and autoantibodies, especially antiphospholipid antibodies, is less pronounced than often reported in the literature. Patients suspected to suffer from reproductive failure due to abnormal autoimmunity have to be screened not only with LA and/or selected antiphospholipid autoantibodies, but with a more comprehensive autoantibody profile.
authors.affiliation: Department of Obstetrics and Gynecology, Mount Sinai Hospital Medical Center, Chicago, IL.
authors.forename: N
authors.initials: N
authors.lastname: Gleicher
authors.forename: L
authors.initials: L
authors.lastname: Harlow
authors.forename: A
authors.initials: A
authors.lastname: el-Roeiy
mesh_terms: D001323:Autoantibodies / Q000276:immunology*; D005260:Female; D006801:Humans; D007132:Immunoglobulin Isotypes / Q000276:immunology; D007136:Immunoglobulins / Q000276:immunology*; D007247:Infertility, Female / Q000276:immunology; D016682:Lupus Coagulation Inhibitor / Q000276:immunology*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000276:immunology*
chemical_list: D001323:Autoantibodies; D007132:Immunoglobulin Isotypes; D007136:Immunoglobulins; D016682:Lupus Coagulation Inhibitor