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Sera from groups of patient with systemic lupus erythematosus, mixed connective tissue disease, rheumatoid arthritis, and progressive systemic sclerosis and normal controls were compared, using different antinuclear antibody assays. Hep-II cells, used as a substrate for the detection of antinuclear antibodies, appeared to be more sensitive than rat liver substrate. In addition, the fluorescent patterns were easier to identify on Hep-II cells. All systemic lupus erythematosus sera with antibodies reactive with kinetoplasts of Crithidia luciliae had binding greater than 43% for single-stranded DNA. Based on the high sensitivity of the Hep-II substrate and the relative specificity of high (greater than 43%) binding for single stranded DNA by sera from patients with systemic lupus erythematosus, it appears that these two tests are most useful in differential diagnosis and for the detection of systemic lupus erythematosus.

journal of clinical microbiology

Evaluation of fluorescent antinuclear antibody assays, Crithidia luciliae substrate, and single-stranded DNA-binding capacity in diagnosis of four rheumatic diseases