Abstract
Indirect immunofluorescent tests were employed to study antinuclear antibodies (ANA) of the IgD class in sera from patients with autoimmune disease. In sera containing IgG-ANA, IgD-ANA was detected in 48% of patients with systemic lupus erythematosus, 37% with rheumatoid arthritis, 30% with Raynaud's disease, 23% with systemic scleroderma and 20% with discoid lupus erythematosus. Quantitative comparison of serum IgG, IgA, IgM and IgD between IgG-ANA-positive sera with and without IgD-ANA revealed that patients with IgD-ANA also had elevated serum IgA levels. The detection of IgD-ANA in over 36% of the patient population suggests that IgD may play a role in autoimmune disorders.
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