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Deficiency of N-myristoylation reveals calcineurin activity as regulator of IFN-γ-producing γδ T cells.

J. Leukoc. Biol.2017 Apr;101(4):1005-1014. Epub 2017 Jan 06
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摘要


γδ T cell subsets can be characterized, in part, by their secretion of select proinflammatory cytokines. The molecular mechanisms driving the diverse fates of γδ T cells have not been elucidated. We have previously shown that the attachment of myristic acid to the N-terminal glycine of proteins, termed N-myristoylation, is essential for αβ T cell development and activation. Here, we explore the potential role of this lipid modification on the activation of γδ T cells. In the absence of N-myristoylation, the CD27+ γδ T cell subset was dominantly affected. The cells produced high levels of IFN-γ upon stimulation. In addition, they were more sensitive to inhibition of the CaN-Nfat pathway than were γδ T cells with myristoylated CaN. N-Myristoylation was found to modulate activity of phosphatase CaN, a regulator of Nfat. In summary, the CaN-Nfat pathway regulates development and function of IFN-γ-producing γδ T cells, and its balanced activity is strongly dependent on CaN N-myristoylation.

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