Abstract
It is unclear whether TGF-β, a critical differentiation factor for T cells producing interleukin 17 (TH-17 cells), is required for the initiation of experimental autoimmune encephalomyelitis (EAE) in vivo. Here we show that mice whose T cells cannot respond to TGF-β signaling lack TH-17 cells and do not develop EAE despite the presence of T helper cell type 1 infiltrates in the spinal cord. Local but not systemic antibody blockade of TGF-β prevented TH-17 cell differentiation and the onset of EAE. The pathogen stimulus zymosan, like mycobacterium, induced TH-17 cells and initiated EAE, but the disease was transient and correlated with reduced production of interleukin 23. These data show that TGF-β is essential for the initiation of EAE and suggest that disease progression may require ongoing chronic inflammation and production of interleukin 23.
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Acknowledgements
We thank F. Powrie (Sir William Dunn School of Pathology, University of Oxford, Oxford, UK) for the transfer of CD4dnTGFβRII breeder mice; H. Jani for initial help in preparation of spinal cords; and H. Boyes for assessing clinical scores in treated mice.
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M.V. did the experiments; R.J.H. assisted with RT-PCR; R.A.F. provided the CD4dnTGFβ RII mice; and B.S. wrote the paper.
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Supplementary Fig. 1
Cytokine mRNA induction after DC stimulation. (PDF 87 kb)
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Veldhoen, M., Hocking, R., Flavell, R. et al. Signals mediated by transforming growth factor-β initiate autoimmune encephalomyelitis, but chronic inflammation is needed to sustain disease. Nat Immunol 7, 1151–1156 (2006). https://doi.org/10.1038/ni1391
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DOI: https://doi.org/10.1038/ni1391
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