Protein kinase C-θ promotes Th17 differentiation via upregulation of Stat3.
Protein kinase C-θ promotes Th17 differentiation via upregulation of Stat3.
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DOI:
10.4049/jimmunol.1102941
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发表时间:
2012-06-15
期刊:
影响因子:
--
通讯作者:
Sun Z
中科院分区:
文献类型:
--
作者:
Kwon MJ;Ma J;Ding Y;Wang R;Sun Z
Although protein kinase C-θ (PKC-θ)-deficient mice are resistant to the induction of Th17-dependent experimental autoimmune encephalomyelitis, the function of PKC-θ in Th17 differentiation remains unknown. Here we show that purified, naive CD4 PKC-θ−/− T cells were defective in Th17 differentiation, whereas Th1 and Th2 differentiation appeared normal. Activation of PKC-θ with PMA promoted Th17 differentiation in wild type (WT) but not PKC-θ−/− T cells. Furthermore, PKC-θ−/− T cells had notably lower levels of Stat3, a transcription factor required for Th17 differentiation, and PMA markedly stimulated the expression of Stat3 in WT but not PKC-θ−/− T cells. In contrast, activation of Stat4 and Stat6, which are critical for Th1 and Th2 differentiation, was normal in PKC-θ−/− T cells. Forced expression of Stat3 significantly increased Th17 differentiation in PKC-θ−/− T cells, suggesting that reduced Stat3 levels were responsible for impaired Th17 differentiation and that Stat3 lies downstream of PKC-θ. Constitutively active PKC-θ or WT PKC-θ activated by either PMA or TCR cross-linking, stimulated expression of a luciferase reporter gene driven by the Stat3 promoter. PKC-θ-mediated activation of the Stat3 promoter was inhibited by dominant negative AP-1 and IκB kinase-β, but stimulated by WT AP-1 and IκB kinase-β, suggesting that PKC-θ stimulates Stat3 transcription via the AP-1 and NF-κB pathways. Lastly, conditions favoring Th17 differentiation induced the highest activation level of PKC-θ. Altogether the data indicate that PKC-θ integrates the signals from TCR signaling and Th17 priming cytokines to up-regulate Stat3 via NF-κB and AP-1, resulting in the stimulation of Th17 differentiation.
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