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IgA class anti-beta2-glycoprotein I in patients with systemic lupus erythematosus
A Tsutsumi1, E Matsuura, K Ichikawa
1Department of Medicine II, Hokkaido University School of Medicine, Sapporo, Japan.
Objective:
To search for a possible relationship between the presence of IgA class anti-beta2-glycoprotein I antibody (abeta2-GPI) and clinical manifestations, including thrombotic episodes, in patients with systemic lupus erythematosus (SLE).
Methods:
Serum IgA abeta2-GPI levels in 124 Japanese patients with SLE were measured using a phospholipid independent enzyme immunoassay. Relationships to clinical histories and to various laboratory data including IgG and IgM class abeta2-GPI were examined.
Results:
Twenty-five percent of patients with SLE were positive for IgA abeta2-GPI. Patients with a history of thrombosis had significantly higher probabilities for positivity of IgA abeta2-GPI, compared to those without. The presence of IgA abeta2-GPI was correlated with presence of lupus anticoagulant and/or biological false positive result for serological syphilis test. Titer of IgA abeta2-GPI significantly correlated with values of IgG abeta2-GPI, IgM abeta2-GPI, and anti-DNA antibodies.
Conclusion:
The presence of IgA abeta2-GPI may be related to the occurrence of thrombosis in patients with SLE. Measurements of IgA abeta2-GPI may be of value for evaluating risk of thrombosis in patients with SLE.