Notch simultaneously orchestrates multiple helper T cell programs independently of cytokine signals.

Notch simultaneously orchestrates multiple helper T cell programs independently of cytokine signals.
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DOI:
10.1016/j.immuni.2013.07.006
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发表时间:
2013-07-25
期刊:
影响因子:
32.4
通讯作者:
Pear WS
Pear WS
中科院分区:
医学1区
文献类型:
--
作者:
Bailis W;Yashiro-Ohtani Y;Fang TC;Hatton RD;Weaver CT;Artis D;Pear WS

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提出了两种模型来解释Notch在辅助性T(Th)细胞分化过程中的功能。一种认为Notch指示一种Th细胞的命运,而另一种认为Notch功能是由细胞因子决定的。在这里,我们提供了一个详细的机制研究调查的作用Notch在编排Th细胞分化。Notch既不指导Th细胞分化,也不指导细胞因子的Notch活性,但相反,Notch独立于细胞因子信号同时调节Th 1,Th 2和Th 17细胞遗传程序。除了在极化和非极化Th细胞中调节这些程序之外,我们还将Ifng鉴定为直接Notch靶标。Notch结合Ifng CNS-22增强子,其中它在启动子处与Tbet协同。因此,Notch充当Th细胞分化的无偏放大器。我们的数据为Notch在造血中提供了一个范例,Notch同时协调多个谱系程序,而不是限制替代结果。
Two models are proposed to explain Notch function during helper T (Th) cell differentiation. One argues that Notch instructs one Th cell fate over the other, whereas the other posits that Notch function is dictated by cytokines. Here we provide a detailed mechanistic study investigating the role of Notch in orchestrating Th cell differentiation. Notch neither instructed Th cell differentiation nor did cytokines direct Notch activity, but instead, Notch simultaneously regulated the Th1, Th2, and Th17 cell genetic programs independently of cytokine signals. In addition to regulating these programs in both polarized and non-polarized Th cells, we identified Ifng as a direct Notch target. Notch bound the Ifng CNS-22 enhancer, where it synergized with Tbet at the promoter. Thus, Notch acts as an unbiased amplifier of Th cell differentiation. Our data provide a paradigm for Notch in hematopoiesis, with Notch simultaneously orchestrating multiple lineage programs, rather than restricting alternate outcomes.
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