Background Patients with rheumatoid arthritis (RA) have a systemic Th1 defect associated with inflammation. Objective To examine the hypothesis that interleukin 17 (IL-17) contributes to this defect. Methods IL-17 effects on Th1 markers were examined on T-bet and interferon γ (IFNγ) expression in peripheral blood mononuclear cells (PBMCs) from patients with RA or healthy controls (HC). Receptor specificities were determined by analysis of the Th1-specific IL-12 receptor β2 (IL-12Rβ2), Th17-specific IL-23R and the common IL-12Rβ1 chain expression. Effects of IL-17 or IFNγ on IL-6, IL-1, IL-8, matrix metalloproteinase-8 (MMP-8) were measured by real-time RT-PCR in RA synovial cells. Results RA PBMCs were less responsive to IL-12-induced IFNγ than HC PBMCs. IL-12 hyporesponsiveness was increased by IL-17 treatment associated with a selective reduction in IL-12Rβ2, but not IL-23R, IL-12Rβ1 or T-bet, which was reversed with IL-17R inhibition. IL-17 inhibited IL-12Rβ2 expression in developing Th1 cells. In RA synovial cells, IL-17 induced IL-6, IL-1, IL-8 and MMP-8, whereas IFNγ haBackground Patients with rheumatoid arthritis (RA) have a systemic Th1 defect associated with inflammation. Objective To examine the hypothesis that interleukin 17 (IL-17) contributes to this defect. Methods IL-17 effects on Th1 markers were examined on T-bet and interferon γ (IFNγ) expression in peripheral blood mononuclear cells (PBMCs) from patients with RA or healthy controls (HC). Receptor specificities were determined by analysis of the Th1-specific IL-12 receptor β2 (IL-12Rβ2), Th17-specific IL-23R and the common IL-12Rβ1 chain expression. Effects of IL-17 or IFNγ on IL-6, IL-1, IL-8, matrix metalloproteinase-8 (MMP-8) were measured by real-time RT-PCR in RA synovial cells. Results RA PBMCs were less responsive to IL-12-induced IFNγ than HC PBMCs. IL-12 hyporesponsiveness was increased by IL-17 treatment associated with a selective reduction in IL-12Rβ2, but not IL-23R, IL-12Rβ1 or T-bet, which was reversed with IL-17R inhibition. IL-17 inhibited IL-12Rβ2 expression in developing Th1 cells. In RA synovial cells, IL-17 induced IL-6, IL-1, IL-8 and MMP-8, whereas IFNγ ha
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集研發(fā)、生產(chǎn)、銷售、服務(wù)及品牌代理為一體的生物技術(shù)公司,目前可提供各種抗體、免疫學(xué)相關(guān)的檢測試劑盒、胎牛血清,動物抗血清等高品質(zhì)產(chǎn)品及服務(wù),涵蓋分子生物學(xué)、細(xì)胞生物學(xué)、免疫學(xué)等生命科學(xué)領(lǐng)域。
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