© 1995 British Society for Rheumatology
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PRESENCE OF BACTERIAL FLORA-DERIVED ANTIGEN IN SYNOVIAL TISSUE MACROPHAGES AND DENDRITIC CELLS
*Department of Immunology, Erasmus University, St Franciscus Hospital Rotterdam, The Netherlands
Department of Rheumatology, St Franciscus Hospital Rotterdam, The Netherlands
Correspondence to:
Correspondence to: M. P. Hazenberg, Department of Immunology, Erasmus University, PO Box 1738, 3000 DR Rotterdam, The Netherlands.
In previous studies using an animal model human bacterial flora-derived peptidoglycan polysaccharides were shown to be arthropathic after a single subcutaneous injection. A prerequisite for proof of the hypothesis that bacterial products from the normal resident flora are involved in the immune reaction of human chronic polyarthritis of unknown aetiology is the presence of these antigens in synovial tissue. 2E9, a monoclonal antibody we developed against intestinal peptidoglycan polysaccharides, was used in a histochemical study in rats and stained macrophages in the spleen red pulp. In this study human synovial tissues from 10 rheumatoid arthritis (RA) and 20 non-RA patients were stained with 2E9. We found that eight out of 10 RA patients had 2E9-positive macrophages and dendritic cells in their synovia. A significant difference was observed with the control group in which seven out of 20 were positive. No positive cells or staining of the matrix was found in the cartilage of six RA patients. These results show that exogenous bacterial antigens are present in synovial tissue macrophages and dendritic cells. It was concluded that the unknown antigen in the immune reaction in RA is not necessarily endogenous.
KEY WORDS: Rheumatoid arthritis, Peptidoglycan polysaccharides, Synovium
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