The kinase PKCα selectively upregulates interleukin-17A during Th17 cell immune responses.

The kinase PKCα selectively upregulates interleukin-17A during Th17 cell immune responses.
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在Th17细胞免疫反应期间,激酶PKCα有选择地上调白介素17a。

DOI:
10.1016/j.immuni.2012.09.021
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发表时间:
2013-01-24
期刊:
影响因子:
32.4
通讯作者:
Baier G
Baier G
中科院分区:
医学1区
文献类型:
--
作者:
Meisel M;Hermann-Kleiter N;Hinterleitner R;Gruber T;Wachowicz K;Pfeifhofer-Obermair C;Fresser F;Leitges M;Soldani C;Viola A;Kaminski S;Baier G

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转化生长因子β(TGFβ)与辅助性T细胞17(Th 17)生物学和触发白细胞介素-17A(IL-17 A)的表达有关,白细胞介素-17A是一种关键的Th 17细胞因子。TGFβ受体(TGFβR)信号转导失调与Th 17细胞介导的自身免疫发病机制有关。然而,参与驱动IL-17 A表达的TGFβR途径活化的完整分子机制仍然未知。在此,我们鉴定了蛋白激酶C α(PKCα)作为TGFβRI活化中的Th 17细胞亚群特异性的信号中间体。我们已经发现PKCα与TGFβRI在物理上相互作用并在功能上协同作用,促进SMAD 2 -3的强烈激活。此外,PKCα缺陷(Prkca−/−)细胞表现出SMAD依赖性IL-2抑制缺陷,以及IL 17 a启动子内STAT 3 DNA结合减少。一致的是,Prkca−/−细胞在体外不能产生适当的IL-17 A反应,但不能产生IL-17 F反应,并且在体内对Th 17细胞依赖性实验性自身免疫性脑脊髓炎的诱导具有抗性。PKCα缺陷小鼠对EAE诱导具有抵抗性。PKCα功能特异于Th 17细胞亚群。PKCα是IL-17 A转录的正调节因子。PKCα直接调节TGFβ RI介导的SMAD 2 -3磷酸化。
Transforming growth-factor β (TGFβ) has been implicated in T helper 17 (Th17) cell biology and in triggering expression of interleukin-17A (IL-17A), which is a key Th17 cell cytokine. Deregulated TGFβ receptor (TGFβR) signaling has been implicated in Th17-cell-mediated autoimmune pathogenesis. Nevertheless, the full molecular mechanisms involved in the activation of the TGFβR pathway in driving IL-17A expression remain unknown. Here, we identified protein kinase C α (PKCα) as a signaling intermediate specific to the Th17 cell subset in the activation of TGFβRI. We have shown that PKCα physically interacts and functionally cooperates with TGFβRI to promote robust SMAD2-3 activation. Furthermore, PKCα-deficient (Prkca−/−) cells demonstrated a defect in SMAD-dependent IL-2 suppression, as well as decreased STAT3 DNA binding within the Il17a promoter. Consistently, Prkca−/− cells failed to mount appropriate IL-17A, but not IL-17F, responses in vitro and were resistant to induction of Th17-cell-dependent experimental autoimmune encephalomyelitis in vivo. PKCα-deficient mice are resistant to EAE induction ► PKCα function is specific to the Th17 cell subset ► PKCα is a positive regulator of IL-17A transcription ► PKCα directly regulates TGFβRI-mediated phosphorylation of SMAD2-3
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