Abstract
The nonapoptotic functions of Fas ligation are incompletely characterized. In contrast to expectations, we show here that Fas-deficient mice developed less-severe collagen-induced arthritis than did control mice. Despite having milder arthritis, Fas-deficient mice had more of the critical pro-inflammatory mediator interleukin-1β (IL-1β) in their joints, suggesting inefficient activation through IL-1 receptor 1 (IL-1R1) when Fas signaling is deficient. In primary human macrophages and macrophages from Fas- or Fas ligand (FasL)-deficient mice, interruption of Fas-FasL signaling suppressed nuclear factor-κB activation and cytokine expression induced by IL-1β and lipopolysaccharide. This cross-talk was mediated by the Fas-associated death domain through interaction with myeloid differentiation factor 88. These observations document a unique mechanism whereby Fas-FasL interactions enhance activation through the IL-1R1 or Toll-like receptor 4 pathway, which may contribute to the pathogenesis of chronic arthritis.
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Acknowledgements
We thank M.E. Peter and V.M. Dixit for providing the FADD and dominant negative FADD plasmids; J. Karras for providing the antisense FADD deoxyoligonucleotides; and R. Medzhitov for providing the MyD88 plasmid. We also thank H. Perlman, P.H. Stern, N.A. Clipstone and A. Lin for critical review of the manuscript; M.E. Peter for advice on the immunoprecipitation experiments; C.J. Zander for technical assistance; and H.-J. Kreutzer for help evaluating joint histopathology. Supported by the National Institutes of Health (R01-AR049217) and The Veterans Administration Research Service (Merit Review), the National and Greater Chicagoland Chapters of the Arthritis Foundation and Deutsche Forschungsgemeinschaft (IB 24/3-1 to S.M.I.).
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Ma, Y., Liu, H., Tu-Rapp, H. et al. Fas ligation on macrophages enhances IL-1R1–Toll-like receptor 4 signaling and promotes chronic inflammation. Nat Immunol 5, 380–387 (2004). https://doi.org/10.1038/ni1054
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DOI: https://doi.org/10.1038/ni1054
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