Abstract
Rapid induction of inflammatory genes by tumor necrosis factor (TNF) has been well studied, but little is known about delayed and chronic TNF responses. Here we investigated the kinetics of primary macrophage responses to TNF and discovered that TNF initiates an interferon-β-mediated autocrine loop that sustains expression of inflammatory genes and induces delayed expression of interferon-response genes such as those encoding the transcription factors STAT1 and IRF7, which enhance macrophage responses to stimulation of cytokines and Toll-like receptors. TNF-induced interferon-β production depended on interferon-response factor 1, and downstream gene expression was mediated by synergy between small amounts of interferon-β and canonical TNF-induced signals. Thus, TNF activates a 'feed-forward' loop that sustains inflammation but avoids the potential toxicity associated with the high interferon production induced by stimulation of Toll-like receptors.
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Acknowledgements
We thank D. Levy (New York University School of Medicine) for providing IFNAR-deficient mice; E. Falck-Pedersen (Weill Medical College of Cornell University) for providing IRF3-deficient bone marrow; A. Ding (Weill Medical College of Cornell University) for MyD88- and TRIF-deficient bone marrow; J. Rutledge for statistical analysis of toxic shock survival; and E. Kelly for critically reviewing the manuscript. Supported by the National Institutes of Health (AR050401, AR46713 and AI46712 to L.B.I.).
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A.Y. designed and did experiments and wrote the manuscript; K.H.-P.M., T.A. and X.H. did experiments; and L.B.I. designed and supervised the research and wrote the manuscript.
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Yarilina, A., Park-Min, KH., Antoniv, T. et al. TNF activates an IRF1-dependent autocrine loop leading to sustained expression of chemokines and STAT1-dependent type I interferon–response genes. Nat Immunol 9, 378–387 (2008). https://doi.org/10.1038/ni1576
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DOI: https://doi.org/10.1038/ni1576
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