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Distribution of macrophages in rheumatoid synovial membrane and its association with basic activity

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Summary

Rheumatoid arthritis (RA) is an inflammatory disease of the synovial membrane, which results in the destruction of joints by inflammatory pannus. The synovial membrane shows proliferation and cellular infiltrates on microscopy with signs of chronic and acute inflammation. Macrophages are thought to play a central role in the pathogenesis of RA. We examined synovial membrane specimens of 21 RA patients using morphological, immunohistological and enzyme histochemical methods for number and distribution of macrophages. We were able to identify 41.5±8.8% of lining cells as macrophages, depending on the method used. In abundant diffuse lymphocellular infiltrates, 23.4±11.1% of mononuclear cells were macrophages. In addition, most cells in the region of tumorlike proliferation and a stromal population of fibroblastlike cells were detected by macrophage markers. Although cell number in synovial membrane increases drastically, we did not find correlations between the relative amount of macrophages in these regions and basic activity. Basic activity includes proliferative reaction as well as lymphoplasmacellular and mononuclear infiltration-both signs of an immunopathological process. In contrast, using enzymes or activation markers, there was a clear correlation. We consider that a constant high percentage of macrophages in RA synovial membrane is present regardless of any actual in flammatory process.

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Sack, U., Stiehl, P. & Geiler, G. Distribution of macrophages in rheumatoid synovial membrane and its association with basic activity. Rheumatol Int 13, 181–186 (1994). https://doi.org/10.1007/BF00390265

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