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The Journal of Immunology, Vol 134, Issue 1 180-186, Copyright © 1985 by American Association of Immunologists

ARTICLES

Hybridoma anti-DNA autoantibodies from patients with rheumatoid arthritis and systemic lupus erythematosus demonstrate similar nucleic acid binding characteristics

J Rauch, H Massicotte and H Tannenbaum

Hybridoma anti-DNA antibodies have been generated from the fusion of the GM 4672 lymphoblastoid line with peripheral blood lymphocytes from four normal subjects, nine patients with rheumatoid arthritis (RA), and 13 patients with systemic lupus erythematosus (SLE). A total of 441 hybridoma clones were obtained, of which 37 secreted anti-DNA autoantibodies. The nucleic acid binding characteristics of the anti- DNA antibodies produced by two hybridomas from normal subjects, nine hybridomas from RA patients, and 18 hybridomas from SLE patients are reported. The hybridoma anti-DNA antibodies from all three groups showed similar antigen-binding characteristics for denatured DNA (dDNA), native DNA (nDNA), poly(I), poly(dT), and cardiolipin, by both direct binding and competitive binding analyses. One difference noted between normal-derived anti-DNA antibodies and autoimmune-derived antibodies was the inability of the former to react with z-DNA. However, this requires further substantiation with larger numbers of normal-derived clones. The broad overlap of reactivity to nucleic acid antigens among individual anti-DNA autoantibodies found in two clinically different autoimmune diseases, namely RA and SLE, suggests that the pathogenicity of anti-DNA autoantibodies may bear no relationship to their nucleic acid antigen-binding characteristics.


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