期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 34, 页码 E3189-E3197出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1219221110
关键词
transcription factor; cytokine; Th17; Tc17; enhancer
资金
- government of the Walloon Region
- GlaxoSmithKline Biologicals
- Fonds National de la Recherche Scientifique (FRS-FNRS, Belgium)
- Interuniversity Attraction Pole of the Belgian Federal Science Policy
- Televie
- FRS-FNRS
IFN regulatory factor (IRF) 3 plays a key role in innate responses against viruses. Herein we assessed its contribution to T-cell activation. We observed that poly(I:C)-induced IRF3 activation in CD8 T cells represses IL-17 expression in a type I IFN-independent fashion. Even in the absence of poly(I:C), polyclonally activated naive IRF3(-/-) CD8 T cells expressed high levels of IL-17 and IL-23R in comparison with wild-type cells. Furthermore, IRF3(-/-) OT1 cells adoptively transferred into wild-type hosts also produced higher IL-17 levels upon immunization than their wild-type counterparts. This phenotype could be reversed by ectopic expression of IRF3, confirming that this effect is intrinsic to T cells. We show that IRF3 directly interacts with ROR gamma t in the cytoplasm through its IRF interaction domain and limits its ability to bind and transactivate the IL-17 promoter. These observations uncover an unexpected role of IRF3 in the control of CD8 T-cell polarization.
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