Mechanisms of Macrophage Activation in Rheumatoid Arthritis: the Role of Gamma-interferon
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Gamma-interferon (gamma-IFN) is a potent inducer of surface expression of class II MHC molecules in vitro. Enhanced HLA-DR expression is a characteristic immuno-histological feature of rheumatoid joints. To assess the possible relevance of gamma-IFN to macrophage (M phi) activation in rheumatoid arthritis (RA) we investigated the spontaneous and mitogen-induced production of gamma-IFN by RA lymphocytes using a sensitive radioimmunoassay. Synovial fluids (SF) from a variety of inflammatory and non-inflammatory rheumatic diseases did not contain measurable amounts of IFN. RA lymphocytes from peripheral blood (PBL) and joints failed to show spontaneous gamma-IFN production. RA and control PBL were equally responsive to both mitogen stimulation and to the addition of exogenous interleukin 2 (IL-2) as control PBL. SF lymphocytes from RA patients showed a significantly decreased PHA-stimulated gamma-IFN production and this was in contrast to the SF lymphocytes from patients with other inflammatory joint diseases who showed significantly increased gamma-IFN production compared with matched PB lymphocytes. These results show that gamma-IFN production by peripheral blood and joint cells from patients with RA is normal and it remains to be established whether gamma-IFN is the factor responsible for the macrophage activation seen in the disease.
Effect of pregnancy on collagen-induced arthritis in mice.
Waites G, Whyte A Clin Exp Immunol. 1987; 67(3):467-76.
PMID: 3608230 PMC: 1542636.
Qin O, Yen-Lieberman B, Sapatnekar W, Youngman K, Kusugami K, Fiocchi C Dig Dis Sci. 1988; 33(12):1528-36.
PMID: 3143537 DOI: 10.1007/BF01535942.
Lemmel E, Brackertz D, Franke M, Gaus W, Hartl P, Machalke K Rheumatol Int. 1988; 8(2):87-93.
PMID: 3135572 DOI: 10.1007/BF00271840.
Buchan G, Barrett K, Fujita T, Taniguchi T, Maini R, Feldmann M Clin Exp Immunol. 1988; 71(2):295-301.
PMID: 3127092 PMC: 1541449.
Quantification of macrophage cell surface molecules in rheumatoid arthritis.
Hessian P, Highton J, Palmer D Clin Exp Immunol. 1989; 77(1):47-51.
PMID: 2527651 PMC: 1541930.