EAE is induced because of inflammation of central nervous system (CNS) primarily caused by autoreactive CD4+ T cells. It is well documented that myelin-specific T cells, especially TH1 cells and more recently TH17 cells, are important in the initiation of tissue inflammation in EAE. We have demonstrated that IL-27, a member of the IL-12 family of cytokines, directly suppresses the induction of TH17 cells and generates regulatory IL-10-producing type 1 regulatory T (Tr1) cells. However, the mechanism by which IL-27 mediates inhibition of TH17 cells and promotion of Tr1cells is not well understood. In vivo administration of IL-27 suppresses the development of Th17 cells and EAE. Our preliminary data suggests that IL-27 controls tissue inflammation in EAE by two different but interlinked mechanisms: 1, by inducing the expression of IL-12R?2, and therefore inhibiting the generation of Th17 cells in an IL-12 dependent manner;2, by enhancing the expression of two transcription factors, AhR and c-Maf, that generate Tr1 cells. In this project, we will molecularly define the mechanism by which IL-27 regulates tissue inflammation in EAE by studying the following specific aims: 1) Mechanism by which IL-27 inhibits generation of Th17 cells by studying whether induction of IL-12R?2 chain by IL-27 not only suppresses IL-23R expression but also makes Th17 cells highly responsive to IL-12 and make them plastic to produce IFN-y;2) How IL-27 generates Tr1 cells by studying the role of transcription factors AhR and cMaf and their mutual association in differentiating Tr1 cells. TThese studies will provide a mechanistic basis of how IL-27 suppresses autoimmunity and tissue inflammation in the CNS.

Public Health Relevance

These Studies will provide insight into the mechanisms by which IL-27 suppresses autoimmunity. IFN-, a first line therapy used in the treatment of MS patients, has been shown to induce IL-27 from innate immune system thus making these studies highly relevant for studying the regulation of autoimmunity and tissue inflammation in the CNS.

National Institute of Health (NIH)
National Institute of Neurological Disorders and Stroke (NINDS)
Research Program Projects (P01)
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National Institute of Neurological Disorders and Stroke Initial Review Group (NSD)
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Brigham and Women's Hospital
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Xiao, Sheng; Yosef, Nir; Yang, Jianfei et al. (2014) Small-molecule ROR?t antagonists inhibit T helper 17 cell transcriptional network by divergent mechanisms. Immunity 40:477-89
Kofler, David M; Marson, Alexander; Dominguez-Villar, Margarita et al. (2014) Decreased RORC-dependent silencing of prostaglandin receptor EP2 induces autoimmune Th17 cells. J Clin Invest 124:2513-22
Lee, Youjin; Collins, Mary; Kuchroo, Vijay K (2014) Unexpected targets and triggers of autoimmunity. J Clin Immunol 34 Suppl 1:S56-60
Wu, Chuan; Pot, Caroline; Apetoh, Lionel et al. (2013) Metallothioneins negatively regulate IL-27-induced type 1 regulatory T-cell differentiation. Proc Natl Acad Sci U S A 110:7802-7