Contribution of interleukin 17 to synovium matrix destruction in rheumatoid arthritis.

Interleukin (IL-)17 is a T cell-derived pro-inflammatory cytokine produced by RA synovium. We studied the role of IL-17 in the synovium cytokine network to determine whether it can influence the inflammatory and destructive pattern characteristic of RA. Herein, we investigated whether the production and action of MMP-1 and its inhibitor TIMP-1 could be modulated by IL-17 in the presence of pro-inflammatory cytokine (IL-1) and anti-inflammatory cytokines (IL-4, IL-13, IL-10). The effect of the blockade of endogenous IL-17 on the secretion of MMP-1 and TIMP-1 by RA synovium and matrix destruction was also studied. IL-17 increased the spontaneous production of MMP-1 by synoviocytes five-fold. IL-1 was more potent since it increased MMP-1 production nine-fold. Addition of IL-4, IL-13 and IL-10 to synoviocyte cultures reduced the spontaneous production of MMP-1 and induced TIMP-1 production by synoviocytes stimulated with IL-17 or/and IL-1beta. In the presence of anti-IL-17 blocking mAb, MMP-1 production and collagenase activity by RA synovium was reduced by 50% and associated with a 50% reduction in type I collagen C-telopeptide fragments (CTX) released in the supernatants, demonstrating the direct contribution of IL-17 in destruction. IL-17 and its producing T cells appear to contribute to the inflammatory process involved in the rheumatoid lesion.

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