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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1982 Dec;79(23):7499–7503. doi: 10.1073/pnas.79.23.7499

Antibodies to distinct polypeptides of RNA polymerase I in sera from patients with rheumatic autoimmune disease.

D A Stetler, K M Rose, M E Wenger, C M Berlin, S T Jacob
PMCID: PMC347367  PMID: 6961426

Abstract

Sera from patients with rheumatic autoimmune diseases were screened for antibodies directed against RNA polymerase I by using a solid-phase radioimmunoassay. Significant levels of the antibodies were detected in the sera of all patients with either systemic lupus erythematosus or mixed connective tissue disease and in 78% of the individuals with rheumatoid arthritis. No detectable anti-RNA polymerase I antibodies were found in the sera from healthy subjects. Individuals taking hydralazine, three of whom exhibited symptoms of drug-induced lupus, had barely detectable levels of the antibodies. Immunoglobulins obtained from sera containing anti-RNA polymerase I antibodies, as determined by the radioimmunoassay, could inhibit RNA polymerase I activity in vitro. Sera from patients with systemic lupus erythematosus contained immunoglobulins directed against the polymerase I-associated polypeptide of Mr 65,000 as well as against the polypeptides of Mr 120,000 or Mr 25,000, or both. Sera from individuals with rheumatoid arthritis reacted with the polypeptide of Mr 65,000 only. The antibodies in the sera of patients with mixed connective tissue disease were directed against the Mr 42,000 polypeptide or a combination of the Mr 65,000, 42,000, and 25,000 polypeptides. These data suggest that the production of anti-RNA polymerase I antibodies may be a unique characteristic of individuals with rheumatic autoimmune diseases and that the production of antibodies against specific polypeptides of RNA polymerase I may be indicative of the particular class of disease.

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Selected References

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