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  • Title: Regulation of Th17 cell differentiation and EAE induction by MAP3K NIK.
    Author: Jin W, Zhou XF, Yu J, Cheng X, Sun SC.
    Journal: Blood; 2009 Jun 25; 113(26):6603-10. PubMed ID: 19411637.
    Abstract:
    Th17 cells play an important role in mediating autoimmune diseases, but the molecular mechanism underlying Th17 differentiation is incompletely understood. We show here that NF-kappaB-inducing kinase (NIK), which is known to regulate B-cell maturation and lymphoid organogenesis, is important for the induction of Th17 cells. NIK-deficient naive CD4 T cells are attenuated in the differentiation to Th17 cells, although they are competent in committing to the other effector lineages. Consistently, NIK knockout mice are resistant to experimental autoimmune encephalomyelitis, a disease model that involves the function of Th17 cells. This phenotype was also detected in Rag2 knockout mice reconstituted with NIK-deficient T cells, confirming a T-cell intrinsic defect. We further show that NIK mediates synergistic activation of STAT3 by T-cell receptor and IL-6 receptor signals. NIK deficiency attenuates activation of STAT3 and induction of STAT3 target genes involved in Th17-commitment program. These findings establish NIK as an important signaling factor that regulates Th17 differentiation and experimental autoimmune encephalitis induction.
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