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CD5 Enhances Th17-cell Differentiation by Regulating IFN-γ Response and RORγt Localization

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Journal Eur J Immunol
Date 2013 Dec 21
PMID 24356888
Citations 13
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Abstract

Mechanisms that modulate the generation of Th17 cells are incompletely understood. We report that the activation of casein kinase 2 (CK2) by CD5 is essential for the efficient generation of Th17 cells in vitro and in vivo. In our study, the CD5-CK2 signaling pathway enhanced TCR-induced activation of AKT and promoted the differentiation of Th17 cells by two independent mechanisms: inhibition of glycogen synthase kinase 3 (GSK3) and activation of mTOR. Genetic ablation of the CD5-CK2 signaling pathway attenuated TCR-induced AKT activation and consequently increased activity of GSK3 in Th17 cells. This resulted in increased sensitivity of Th17 cells to IFN-γ-mediated inhibition. In the absence of CD5-CK2 signaling, we observed decreased activity of S6K and attenuated nuclear translocation of RORγt (ROR is retinoic acid receptor related orphan receptor). These results reveal a novel and essential function of the CD5-CK2 signaling pathway and GSK3-IFN-γ axis in regulating Th-cell differentiation and provide a possible means to dampen Th17-type responses in autoimmune diseases.

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