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    Nat Immunol. 2009 Aug;10(8):857-63. Epub 2009 Jul 5.

    Production of interleukin 22 but not interleukin 17 by a subset of human skin-homing memory T cells.

    Duhen T, Geiger R, Jarrossay D, Lanzavecchia A, Sallusto F.

    Source

    Institute for Research in Biomedicine, Bellinzona, Switzerland.

    Abstract

    Interleukin 22 (IL-22) is a cytokine produced by the T(H)-17 lineage of helper T cells and NK-22 subset of natural killer cells that acts on epithelial cells and keratinocytes and has been linked to skin homeostasis and inflammation. Here we characterize a population of human skin-homing memory CD4(+) T cells that expressed the chemokine receptors CCR10, CCR6 and CCR4 and produced IL-22 but neither IL-17 nor interferon-gamma (IFN-gamma). Clones isolated from this population produced IL-22 only and had low or undetectable expression of the T(H)-17 and T helper type 1 (T(H)1) transcription factors RORgammat and T-bet. The differentiation of T cells producing only IL-22 was efficiently induced in naive T cells by plasmacytoid dendritic cells in an IL-6- and tumor necrosis factor-dependent way. Our findings delineate a previously unknown subset of human CD4(+) effector T cells dedicated to skin pathophysiology.

    PMID:
    19578369
    [PubMed - indexed for MEDLINE]

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