Elevated IL-6 expression in CD4 T cells via PKCtheta and NF-kappaB induces Th2 cytokine production.

Elevated IL-6 expression in CD4 T cells via PKCtheta and NF-kappaB induces Th2 cytokine production.
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DOI:
10.1016/j.molimm.2008.12.014
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发表时间:
2009-04
影响因子:
3.6
通讯作者:
Chang CH
Chang CH
中科院分区:
医学3区
文献类型:
--
作者:
Sofi MH;Li W;Kaplan MH;Chang CH

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辅助性 T (Th) 细胞分化是产生适当免疫反应的关键事件。 Th1 和 Th2 细胞分别产生其标志性细胞因子 IFN-γ 和 IL-4。然而,正如我们所报道的,由表达 MHC II 类胸腺细胞 (T-CD4) 选择的 CD4 T 细胞在 Th1 分化条件下产生 Th1 和 Th2 型细胞因子。此外,这些细胞中 Th2 细胞因子的表达不依赖于 Stat6。在本研究中,我们研究了CD4 T细胞在Th1分化条件下产生Th2细胞因子的分子机制。我们观察到 IL-6 在 T-CD4 T 细胞中高表达,这至少部分负责 Th1 分化细胞产生 Th2 细胞因子。 IL-6 表达的增强位于 PKCθ 组成型磷酸化和高 NF-κB 活性的下游。中和 IL-6、阻断 PKCθ 磷酸化或抑制 NF-κB 易位可减少 Th1 培养物中 Th2 细胞因子的表达。因此,我们的研究表明,自分泌IL-6的产生可以诱导Th2细胞因子的产生,并且PKCθ和NF-κB是诱导IL-6介导的Th2发育的重要组成部分。
T helper (Th) cell differentiation is a key event to mount an appropriate immune response. Th1 and Th2 cells produce their signature cytokines IFN-γ and IL-4, respectively. However, as we have reported, CD4 T cells selected by MHC class II-expressing thymocytes (T-CD4) produce both Th1 and Th2 type cytokines under Th1 differentiation conditions. Furthermore, the expression of Th2 cytokines in these cells is Stat6 independent. In the current study, we investigated the molecular mechanisms by which CD4 T cells produce Th2 cytokines under the Th1 differentiation condition. We observed that IL-6 is highly expressed in T-CD4 T cells, which is at least partly responsible for Th2 cytokine production by Th1 differentiated cells. The enhanced expression of IL-6 is downstream of constitutive phosphorylation of PKCθ and high NF-κB activity. Neutralizing IL-6, blocking PKCθ phosphorylation, or inhibiting NF-κB translocation diminished Th2 cytokine expression in Th1 cultures. Therefore, our study revealed that autocrine IL-6 production can induce Th2 cytokine production, and that PKCθ and NF-κB are essential components in the induction of IL-6-mediated Th2 development.
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