Polar opposites: Erk direction of CD4 T cell subsets.

Polar opposites: Erk direction of CD4 T cell subsets.
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DOI:
10.4049/jimmunol.1103015
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发表时间:
2012-07-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Hedrick SM
Hedrick SM
中科院分区:
其他
文献类型:
--
作者:
Chang CF;D'Souza WN;Ch'en IL;Pages G;Pouyssegur J;Hedrick SM

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有效的免疫应答取决于与感染原的性质雅阁的适当T细胞分化,并且分化的偶然性最低程度地取决于T细胞抗原受体、共受体和细胞因子信号。在这项反向遗传学研究中,我们表明,地图激酶,Erk 2,是不必要的T细胞增殖的存在下,最佳的共刺激。相反,它对T-bet和Gata 3表达具有相反的极性作用,因此对Th 1和Th 2分化具有相反的极性作用。或者,在存在TGFβ的情况下,Erk途径抑制大的基因表达程序,有效地限制Foxp 3 + T reg细胞的分化。在后一种情况下,所涉及的机制包括抑制Gata 3和Foxp 3,诱导Tbx 21,磷酸化Smad 2,3,并可能抑制Socs 2,一种Stat 5信号传导的正诱导剂。因此,Erk 2的缺失严重阻碍了Th 1分化,同时增强了Foxp 3+诱导的T调节细胞的发育。在T细胞活化的多种条件下选择的基因表达谱说明了Erk途径信号传导的相反结果。
Effective immune responses depend upon appropriate T cell differentiation in accord with the nature of an infectious agent, and the contingency of differentiation depends minimally on T cell antigen receptor, co-receptor, and cytokine signals. In this reverse genetic study we show that the Map Kinase, Erk2, is nonessential for T cell proliferation in the presence of optimum co-stimulation. Instead, it has opposite polar effects on T-bet and Gata3 expression and hence on Th1 and Th2 differentiation. Alternatively, in the presence of TGFβ, the Erk pathway suppresses a large program of gene expression effectively limiting the differentiation of Foxp3+ T reg cells. In the latter case, the mechanisms involved include suppression of Gata3 and Foxp3, induction of Tbx21, phosphorylation of Smad2,3, and possibly suppression of Socs2, a positive inducer of Stat5 signaling. Consequently, loss of Erk2 severely impeded Th1 differentiation while enhancing the development of Foxp3+ induced T regulatory cells. Selected profiles of gene expression under multiple conditions of T cell activation illustrate the opposing consequences of Erk pathway signaling.
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