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    Biol Chem. 2001 Oct;382(10):1447-53.

    The MKK6/p38 mitogen-activated protein kinase pathway is capable of inducing SOCS3 gene expression and inhibits IL-6-induced transcription.

    Bode JG, Ludwig S, Freitas CA, Schaper F, Ruhl M, Melmed S, Heinrich PC, Häussinger D.

    Source

    Klinik für Gastroenterologie, Hepatologie und Infektiologie, Medizinische Klinik der Heinrich-Heine Universität, Düsseldorf, Germany.

    Abstract

    In this study we show that activation of p38MAPK by IL-6 acts as an inhibitory signal on IL-6-mediated activation of STAT and the alpha2-macroglobulin promoter. We analyzed the role of MKK6/p38MAPK for IL-6 signal transduction and transcriptional activation of the suppressor of cytokine signaling (SOCS) 3 promoter. Pretreatment of cells with the p38MAPK-specific inhibitor SB202190 downregulates the induction of SOCS3-mRNA expression by IL-6. Accordingly, overexpression of a constitutively active MKK6 in HepG2 cells enhanced basal activity or IL-6-induced transcriptional activation of a SOCS3 promoter reporter construct, whereas overexpression of a dominant negative mutant of MKK6 downregulated the IL-6-mediated activation of the SOCS3 promoter. These data indicate that p38MAPK-activation is crucial for IL-6-induced SOCS3 expression and downregulation of IL-6-mediated gene induction.

    PMID:
    11727828
    [PubMed - indexed for MEDLINE]

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