Regulation of T cell activation by Notch ligand, DLL4, promotes IL-17 production and Rorc activation.

Regulation of T cell activation by Notch ligand, DLL4, promotes IL-17 production and Rorc activation.
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DOI:
10.4049/jimmunol.0804322
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发表时间:
2009-06-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Lukacs NW
Lukacs NW
中科院分区:
其他
文献类型:
--
作者:
Mukherjee S;Schaller MA;Neupane R;Kunkel SL;Lukacs NW

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T 细胞的激活和分化取决于许多受免疫环境、抗原性质以及 APC 激活状态影响的起始事件。在目前的研究中,我们研究了特定缺口配体 delta-like 4 (Dll4) 的作用。特别是,我们的数据表明,Dll4 可通过 DC 上的 TLR 激活而被病原体相关信号诱导,但早期反应炎症细胞因子、IL-1 和 IL-18 则不能诱导,这些细胞因子也通过 MyD88 接头途径激活细胞。我们对卵清蛋白特异性 TCR 转基因细胞 (DO11.10) 体外培养物的观察结果证实了早期的报告,即 Dll4 抑制 Th2 细胞因子的产生。此外,在存在其他倾斜细胞因子、IL-6 和 TGFβ 的情况下,Dll4 会增强产生 IL-17 的 T 细胞的生成。在没有缺口信号的情况下,即使在特定的倾斜条件下,IL17 的产生也会显着减少。这些研究进一步证明,Dll4 上调 T 细胞中的 RORγt 表达,并且 RORγt 和 IL17 基因启动子都是直接转录缺口靶标,可增强 Th17 细胞群的分化。因此,有效 T 细胞分化的促进可能取决于通过特异性缺口配体刺激来激活 T 细胞。
The activation and differentiation of T cells are dependent upon numerous initiating events that are influenced by the immune environment, nature of the antigen, as well as the activation state of APCs. In the present studies we have investigated the role of a specific notch ligand, delta-like 4 (Dll4). In particular, our data have indicated that Dll4 is inducible by pathogen-associated signals through TLR activation on DC but not early response inflammatory cytokines, IL-1 and IL-18 that also activate cells via MyD88 adapter pathway. Our observations from in vitro cultures with ovalbumin specific TCR transgenic cells (DO11.10) confirmed earlier reports demonstrating that Dll4 inhibits Th2 cytokine production. Furthermore, Dll4 enhances the generation of IL-17 producing T cells in the presence of additional skewing cytokines, IL-6 and TGFβ. In the absence of notch signals IL17 production was significantly reduced even under specific skewing conditions. These studies further demonstrate that Dll4 upregulates RORγt expression in T cells and that both RORγt and IL17 gene promoters are direct transcriptional notch targets that augment the differentiation of Th17 cell populations. Thus, facilitation of efficient T cell differentiation may depend upon the activation of T cells via specific notch ligand stimulation.
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