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:
影响因子:
--
通讯作者:
Lukacs NW
中科院分区:
文献类型:
--
作者:
Mukherjee S;Schaller MA;Neupane R;Kunkel SL;Lukacs NW
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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