Abstract
OBJECTIVE—Autoantibodies to cell membrane associated DNA are described in systemic lupus erythematosus (SLE). The specificity of these antibodies differ from antibodies to nuclear DNA. METHODS—Using indirect immunofluorescence, a specific IgG was detected giving a characteristic pattern of continuous peripheral membrane fluorescence on cultured B-lymphocytes. RESULTS—This pattern was observed in 53 of 80 serum samples of SLE patients but absent in the serum samples of the control populations: 15 rheumatoid arthritis, 38 ankylosing spondylarthritis, 17 non-inflammatory osteopenic patients, and 224 blood donors. In 34 Sjögren syndrome's patients one only showed a positive test. The cmDNA specificity of these antibodies was confirmed by pattern extinction with DNAse but not RNase or protease pre-treatment of the cells. IgG to cmDNA, separated by absorption/elution from purified cmDNA immobilised on DEAE-nitrocellulose reproduced the immunofluorescence pattern pictures. Extensive serum depletion of anti-double strand or single strand DNA antibodies by absorption to cellulose bound ds- or ss-DNA affected marginally the pericellular fluorescence revealing some minor cross reactivity with nuclear DNA. Moreover, in SLE patients without detectable antibody to ds-DNA, pericellular fluorescence could be visible. CONCLUSION—This novel rapid immunofluorescence method may serve as an identification test of SLE patients. Given its positive (97.1%) and negative (92.9%) predictive value, sensitivity (66%) and specificity (99.5%), it improves on other diagnostic tests such as the detection of antibodies to Sm. Keywords: anti-nuclear antibodies; systemic lupus erythematosus, immunofluorescence, cytoplasmic membrane associated DNA
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Figure 1 .
Immunofluorescence patterns on methanol-fixed Wil2 cells. (A) pattern "0"= absence of any significant fluorescence; (B) pattern "1"= punctuate membrane fluorescence; (C) pattern "2"= continuous membrane peripheral fluorescence.
Figure 2 .
Comparative histogram. Distribution of fluorescence patterns in SLE compared with normal serum samples at three different dilutions: 1/2, 1/20, 1/40.
Selected References
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