Regulation of interferon- g gene expression by nuclear factor of activated T cells

Regulation of interferon- g gene expression by nuclear factor of activated T cells
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活化T细胞核因子调节干扰素g基因表达

DOI:
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
G. Ehninger
G. Ehninger
中科院分区:
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文献类型:
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作者:
A. Kiani;F. García;Ivonne Habermann;Stefanie Laforsch;T. Aebischer;G. Ehninger

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活化T细胞核因子(NFAT)家族的转录因子被认为调节多种诱导基因如白细胞介素-2(IL-2)、IL-4和肿瘤坏死因子-α的表达。然而,NFAT蛋白是否在干扰素- g(IFN-g)基因的转录调控中起作用仍是一个悬而未决的问题.在这里,它表明,转录因子NFAT 1(NFATc 2)是一个主要的调节因子IFN-γ的生产在体内。与表达NFAT 1的T细胞相比,缺乏NFAT 1的T细胞在IFN-γ mRNA和蛋白的表达中显示出实质性的IL-4非依赖性缺陷。在初始CD 4 1 T细胞的体外刺激后,观察到NFAT 1 2 / 2 3 IL-4 2 / 2 T细胞产生的IFN-γ减少,在至少2轮T辅助细胞分化中保持不变,并通过不依赖于Th 2特异性因子加塔-3和c-Maf过表达的细胞内在机制发生。同时,NFAT 1 2 / 2 3 IL-4 2 / 2小鼠显示出对细胞内寄生虫利什曼原虫感染的易感性增加。此外,在鼠T细胞克隆中的IFN-γ产生对NFAT的选择性肽抑制剂VIVIT敏感。这些结果表明T细胞产生IFN-γ受NFAT 1调节,最有可能在基因转录水平。(血。2001;98:1480-1488)© 2001,为NFAT 1在IFN-γ基因中的体内作用提供了强有力的证据
Transcription factors of the nuclear factor of activated T cells (NFAT) family are thought to regulate the expression of a variety of inducible genes such as inter-leukin-2 (IL-2), IL-4, and tumor necrosis factor- a . However, it remains unresolved whether NFAT proteins play a role in regulating transcription of the interferon- g (IFN- g ) gene. Here it is shown that the transcription factor NFAT1 (NFATc2) is a major regulator of IFN- g production in vivo. Compared with T cells expressing NFAT1, T cells lacking NFAT1 display a substantial IL-4–independent defect in expression of IFN- g mRNA and protein. Reduced IFN- g production by NFAT1 2 / 2 3 IL-4 2 / 2 T cells is observed after primary in vitro stimulation of naive CD4 1 T cells, is conserved through at least 2 rounds of T-helper cell differentiation, and occurs by a cell-intrinsic mechanism that does not depend on overexpression of the Th2-specific factors GATA-3 and c-Maf. Con-comitantly, NFAT1 2 / 2 3 IL-4 2 / 2 mice show increased susceptibility to infection with the intracellular parasite Leishmaniamajor. Moreover, IFN- g production in a murine T-cell clone is sensitive to the selective peptide inhibitor of NFAT, VIVIT. These results suggest that IFN- g production by T cells is regulated by NFAT1, most likely at the level of gene transcription. (Blood. 2001;98:1480-1488) © 2001 by provide strong evidence for an in vivo role of NFAT1 in IFN- g gene
DOI: 10.4049/jimmunol.159.6.2735
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影响因子: 4.4
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