Abstract
Interferon-regulatory factor 4 (IRF4) is essential for the development of T helper type 2 cells. Here we show that IRF4 is also critical for the generation of interleukin 17–producing T helper cells (TH-17 cells), which are associated with experimental autoimmune encephalomyelitis. IRF4-deficient (Irf4−/−) mice did not develop experimental autoimmune encephalomyelitis, and T helper cells from such mice failed to differentiate into TH-17 cells. Transfer of wild-type T helper cells into Irf4−/− mice rendered the mice susceptible to experimental autoimmune encephalomyelitis. Irf4−/− T helper cells had less expression of RORγt and more expression of Foxp3, transcription factors important for the differentiation of TH-17 and regulatory T cells, respectively. Altered regulation of both transcription factors contributed to the phenotype of Irf4−/− T helper cells. Our data position IRF4 at the center of T helper cell development, influencing not only T helper type 2 but also TH-17 differentiation.
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Acknowledgements
We thank D. Littman for RORγt-expressing retrovirus; A. Scheffold (Deutsches Rheuma-Forschungszentrum Berlin) for help with siRNA experiments; R. Volkmer (Institut für Medizinische Immunologie, Charité-Universitätsmedizin Berlin) MOG peptide; P. Sack for technical assistance; and M. Saunders for scientific editing. Supported by the Deutsche Forschungsgemeinschaft (LO 396, TR SFB 6044 and GRK 767 to M.L.) and the Gemeinnützige Hertie-Stiftung (1.319.110/03/03 to T.K.).
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A.B. did the in vitro experiments with assistance from M.H.,C.R., P.Y. and E.A.; S.H. did the in vivo and ex vivo experiments; C.S. did the histology; and T.W.M.,T.K. and M.L. provided advice and overall direction and supervised project planning and execution.
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Brüstle, A., Heink, S., Huber, M. et al. The development of inflammatory TH-17 cells requires interferon-regulatory factor 4. Nat Immunol 8, 958–966 (2007). https://doi.org/10.1038/ni1500
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DOI: https://doi.org/10.1038/ni1500
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