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:
影响因子:
--
通讯作者:
Hedrick SM
中科院分区:
文献类型:
--
作者:
Chang CF;D'Souza WN;Ch'en IL;Pages G;Pouyssegur J;Hedrick SM
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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