Volume 63, Issue 8 pp. 2329-2339
Experimental Arthritis

Tumor necrosis factor–interleukin-17 interplay induces S100A8, interleukin-1β, and matrix metalloproteinases, and drives irreversible cartilage destruction in murine arthritis: Rationale for combination treatment during arthritis

Marije I. Koenders

Corresponding Author

Marije I. Koenders

Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Radboud University Nijmegen Medical Centre, Department of Rheumatology, Rheumatology Research and Advanced Therapeutics (272), Geert Grooteplein 28, PO Box 9101, 6500 HB Nijmegen, The NetherlandsSearch for more papers by this author
Renoud J. Marijnissen

Renoud J. Marijnissen

Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Isabel Devesa

Isabel Devesa

Radboud Universidad Miguel Hernández, Alicante, Spain

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Erik Lubberts

Erik Lubberts

Erasmus Medical Centre, Rotterdam, The Netherlands

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Leo A. B. Joosten

Leo A. B. Joosten

Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Johannes Roth

Johannes Roth

University of Muenster, Muenster, Germany

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Peter L. E. M. van Lent

Peter L. E. M. van Lent

Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Fons A. van de Loo

Fons A. van de Loo

Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Wim B. van den Berg

Wim B. van den Berg

Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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First published: 22 April 2011
Citations: 117

Abstract

Objective

To examine whether synovial interleukin-17 (IL-17) expression promotes tumor necrosis factor (TNF)–induced joint pathologic processes in vivo, and to analyze the surplus ameliorative value of neutralizing IL-17 in addition to TNF during collagen-induced arthritis (CIA).

Methods

Adenoviral vectors were used to induce overexpression of IL-17 and/or TNF in murine knee joints. In addition, mice with CIA were treated, at different stages of arthritis, with soluble IL-17 receptor (sIL-17R), TNF binding protein (TNFBP), or the combination.

Results

Overexpression of IL-17 and TNF resulted in joint inflammation and bone erosion in murine knees. Interestingly, IL-17 strikingly enhanced both the joint-inflammatory and joint-destructive capacity of TNF. Further analysis revealed a strongly enhanced up-regulation of S100A8, IL-1β, and matrix metalloproteinase (MMP) messenger RNA, only when both TNF and IL-17 were present. Moreover, the increase in irreversible cartilage destruction was not merely the result of enhanced inflammation, but also was associated with a direct synergistic effect of these cytokines in the joint. S100A9 deficiency in mice protected against IL-17/TNF–induced expression of cartilage NITEGE neoepitopes. During established arthritis, the combination of sIL-17R and TNFBP was more effective than the anticytokine treatments alone, and significantly inhibited further joint inflammation and cartilage destruction.

Conclusion

Local synovial IL-17 expression enhances the role of TNF in joint destruction. Synergy between TNF and IL-17 in vivo results in striking exaggeration of cartilage erosion, in parallel with a synergistic up-regulation of S100A8, IL-1β, and erosive MMPs. Moreover, neutralizing IL-17 in addition to TNF further improves protection against joint damage and is still effective during late-stage CIA. Therefore, compared with anti-TNF alone, combination blocking of TNF and IL-17 may have additional therapeutic value for the treatment of destructive arthritis.

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