Hybridization of peripheral blood lymphocytes from patients with rheumatoid arthritis has yielded 14 monoclonal antibodies which react with cultured human epithelial cells. Immunofluorescence staining identifies at last five different types of antibody. Solid phase immunosorbent assays show a variety of cross-reaction patterns with nucleic acids, proteoglycan, cardiolipin and plastic, confirming that the various antibodies react with epitopes which are at least slightly different. These conclusions are confirmed by SDS gel electrophoresis and immunoblotting on epithelial cell extracts. Similar antibodies previously found in association with lupus-like disease have been thought to be representative of the high antinuclear antibody response characteristic of lupus. Our data are more consistent with the hypothesis that all or many of these antibodies are part of the normal inflammatory response.
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