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    Signaling through Itk promotes T helper 2 differentiation via negative regulation of T-bet

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    Authors
    Miller, Andrew Todd
    Wilcox, Heather M.
    Lai, Zhongbin
    Berg, Leslie J.
    UMass Chan Affiliations
    Department of Pathology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    2004-09-04
    Keywords
    Animals; CD4-Positive T-Lymphocytes; Cell Differentiation; *Gene Expression Regulation; Mice; Protein-Tyrosine Kinases; *Signal Transduction; T-Box Domain Proteins; Th1 Cells; Th2 Cells; Transcription Factors
    Life Sciences
    Medicine and Health Sciences
    
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    http://dx.doi.org/10.1016/j.immuni.2004.06.009
    Abstract
    The Tec family tyrosine kinase, Itk, is critical for PLC-gamma1 activation downstream of the TCR. Studies of Itk-/- mice have demonstrated a requirement for Itk in Th2 cytokine production and protective immunity to parasitic infections. Here we address the mechanism by which Itk regulates Th2 differentiation. We find that naive Itk-/- CD4+ T cells respond normally to cytokine skewing signals and can differentiate efficiently into either Th1 or Th2 lineage cells. In the absence of skewing cytokines, wild-type CD4+ T cells stimulated with low-avidity ligands preferentially express GATA-3 mRNA and differentiate into Th2 cells. Under these same stimulation conditions, Itk-/- T cells produce large amounts of T-bet mRNA and differentiate into IFN-gamma-producing cells. Furthermore, Itk is upregulated during Th2 differentiation, while Rlk, a related Tec kinase, disappears rapidly from differentiating Th2 cells. Together, these findings provide a molecular explanation for the essential role of Itk in Th2 differentiation.
    Source
    Immunity. 2004 Jul;21(1):67-80. Link to article on publisher's site
    DOI
    10.1016/j.immuni.2004.06.009
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/34211
    PubMed ID
    15345221
    Related Resources
    Link to article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.immuni.2004.06.009
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