alexa A novel mechanism for ERK-dependent regulation of IL4 transcription during human Th2-cell differentiation.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Tripathi P, Sahoo N, Ullah U, Kallionp H, Suneja A,

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Abstract We demonstrate that the mitogen-activated protein kinases extracellular signal-regulated kinase (ERK)-1 and ERK-2 have a central role in mediating T-cell receptor-dependent induction of IL4 expression in human CD4(+) T cells. Significantly, this involved a novel mechanism wherein receptor cross-linking induced activated ERK to physically associate with a promoter element on the IL4 gene. The proximally localized ERK then facilitated recruitment of the key transcription factors necessary for initiating IL4 gene transcription. Although both ERK-1 and ERK-2 bound to the promoter, recruitment of either one alone was found to be sufficient. We thus identify a novel mode of function for ERK wherein its physical association with the promoter serves as a prerequisite for enhanceosome assembly. This unusual pathway is also indispensable for human Th2-cell differentiation.
This article was published in Immunol Cell Biol and referenced in Journal of Clinical & Cellular Immunology

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