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- W2243044835 abstract "We set out to determine whether the ability of synovial fluids (SF) in patients with rheumatoid arthritis (RA) to facilitate the proliferation of synovial tissue-derived fibroblastic cell lines was related to the presence of growth factors and/or cytokines.The growth factor activity of 20 RA SF was measured by their ability to induce anchorage-independent growth of the rat NRK-49F (49F) fibroblastic strain. The presence of transforming growth factor-beta (TGF-beta) and platelet-derived growth factor (PDGF) was also assessed using neutralising anti-TGF-beta or anti-PDGF-AB mAbs. Cytokines were measured by functional assays or ELISA:We observed a correlation between growth factor activity and the IL-6 levels in SF. Both were correlated to the erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels in SF and serum. IL-6 (at concentrations above 10(4) U/ml), synergized with growth factors in the induction of the anchorage independent (AI) growth of 49F cells. Pretreatment of SF with a neutralising anti-IL-6 mAb substantially reduced the capacity of these SF to induce AI growth of 49F cells, confirming the growth factor activity of IL-6 in this test. In contrast, IL-6 alone or in association with PDGF, epidermal growth factor (EGF) or TGF-beta had no effect on the anchored growth of synovial tissue-derived fibroblasts, and treatment of SF with a neutralising anti-IL-6 mAb did not affect their ability to increase the growth rate of synovial tissue-derived fibroblasts.These results strongly suggest that IL-6 is responsible for the observed correlation between the growth factor activity of SF and inflammatory indexes such as ESR and CRP. However, neither IL-6 nor PDGF were responsible for the observed positive effect of SF on synovial fibroblastic cell lines." @default.
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- W2243044835 date "1994-11-01" @default.
- W2243044835 modified "2023-10-16" @default.
- W2243044835 title "Growth factor activity of IL-6 in the synovial fluid of patients with rheumatoid arthritis." @default.
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