Standardized measurement of major immunoglobulin class (IgG, IgA, and IgM) antibodies to beta2glycoprotein I in patients with antiphospholipid syndrome.
Patients with the antiphospholipid syndrome (APS) have autoantibodies directed against epitopes on beta2 glycoprotein I (beta2GPI). We describe herein the performance characteristics of standardized enzyme-linked immunosorbent assays (ELISAs) for anti-beta2GPI of the three major immunoglobulin classes: IgG, IgA, and IgM. All three assays generated highly linear standard curves (5 points, r > or = 0.993 for each); precision was excellent both intra-assay and run-to-run, with coefficients of variation (CV) ranging from 2.3% to 6.6%. Values for IgG anti-beta2GPI correlated strongly with those obtained by an earlier method (r = 0.80, P< 0.0001). A study group consisting of 203 healthy subjects was used to generate percentile-based reference intervals for all three classes of anti-beta2GPI. APS subjects' anti-beta2GPI were found to differ significantly (P <0.0001 for each) from those of the control population. All three assays correlated well with beta2GPI-dependent anticardiolipin antibody (aCL) measurements; IgG: r = 0.94 (P <0.0001), for IgA: r = 0.82 (P<0.001) and for IgM: r = 0.84 (P<0.0001). We suggest that these ELISAs may provide valuable standardized measurements of IgG, IgA, and IgM anti-P2GPI.
INOVA Diagnostics, Inc., San Diego, California, USA.
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S
Lewis
L B
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Keil
W L
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Binder
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DeBari
D000293:Adolescent; D000328:Adult; D000368:Aged; D017153:Antibodies, Anticardiolipin / Q000097:blood; D016736:Antiphospholipid Syndrome / Q000276:immunology*; D001323:Autoantibodies / Q000097:blood*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D006023:Glycoproteins / Q000097:blood / Q000276:immunology*; D006801:Humans; D007070:Immunoglobulin A / Q000097:blood*; D007074:Immunoglobulin G / Q000097:blood*; D007075:Immunoglobulin M / Q000097:blood*; D008875:Middle Aged; D012016:Reference Values; D053482:beta 2-Glycoprotein I
D017153:Antibodies, Anticardiolipin; D001323:Autoantibodies; D006023:Glycoproteins; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D053482:beta 2-Glycoprotein I