Micro-RNA-155 inhibits IFN-gamma signaling in CD4+ T cells.

Micro-RNA-155 inhibits IFN-gamma signaling in CD4+ T cells.
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DOI:
10.1002/eji.200939381
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发表时间:
2010-01
影响因子:
5.4
通讯作者:
Reiner, Steven L.
Reiner, Steven L.
中科院分区:
医学3区
文献类型:
--
作者:
Banerjee, Arnob;Schambach, Felix;DeJong, Caitlin S.;Hammond, Scott M.;Reiner, Steven L.

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微RNA(micro-RNA,miR)作为基因表达的组织特异性模式的重要调控因子,越来越受到人们的重视。例如,缺乏miR-155的CD 4 + T细胞表现出对Th 2分化的偏好,这表明单个miR的缺乏可以改变CD 4 + T细胞分化。我们现在表明,miR-155是诱导T细胞活化,它促进Th 1分化时,在活化的CD 4 + T细胞过表达。miR-155的拮抗作用导致IFN-γRα的诱导,并且在IFN-γRα的3′ UTR内鉴定了功能性miR-155靶位点。这些结果确定IFN-γRα是T细胞中的第二个miR-155靶标,并表明miR-155通过抑制IFN-γ信号传导促进CD 4 + T细胞中的Th 1分化。
Micro-RNA (miR) are increasingly recognized as critical regulators of tissue-specific patterns of gene expression. CD4+ T cells lacking miR-155, for example, exhibit bias towards Th2 differentiation, indicating that the absence of individual miR could alter CD4+ T cell differentiation. We now show that MiR-155 is induced upon T cell activation and that it promotes Th1 differentiation when over-expressed in activated CD4+ T cells. Antagonism of miR-155 leads to induction of IFN-γRα, and a functional miR-155 target site is identified within the 3′ UTR of IFN-γRα. These results identify IFN-γRα as a second miR-155 target in T cells and suggest that miR-155 contributes to Th1 differentiation in CD4+ T cells by inhibiting IFN-γ signaling.
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