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Phagocytosis of yeast particles by peripheral blood and synovial fluid neutrophils was compared in the sera and synovial fluids from 16 osteoarthritis, 23 rheumatoid arthritis, and 12 miscellaneous arthritis patients. Phagocytosis by normal peripheral blood neutrophils was decreased equally and significantly in all synovial fluids. All synovial fluid neutrophils demonstrated decreased phagocytic capacity in all media. Rheumatoid arthritis synovial fluid neutrophils showed significantly less phagocytosis than miscellaneous arthritis synovial fluid neutrophils. Normal peripheral blood neutrophils which in vitro had previously ingested monosodium urate crystals or oil red O, subsequently exhibited a normal yeast phagocytic capacity. Normal peripheral blood neutrophils, which had ingested preformed immunoglobulin G-rheumatoid factor complexes exhibited significantly less yeast phagocytic capacity than control cells or cells preincubated with the individual complex components. There was a significant correlation between the log of the reciprocal of the rheumatoid factor titer in sera used to produce complexes and the phagocytic capacity exhibited by test neutrophils. Ingestion of immunoglobulin G-rheumatoid factor complexes may be important in the production of the cellular phagocytic defect which this study has demonstrated in rheumatoid arthritis synovial fluid neutrophils.

Phagocytic Function of Polymorphonuclear Leukocytes in Rheumatic Diseases