CCAAT/enhancer-binding protein α negatively regulates IFN-γ expression in T cells.

CCAAT/enhancer-binding protein α negatively regulates IFN-γ expression in T cells.
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DOI:
10.4049/jimmunol.1303422
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发表时间:
2014-12-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Dong C
Dong C
中科院分区:
其他
文献类型:
--
作者:
Tanaka S;Tanaka K;Magnusson F;Chung Y;Martinez GJ;Wang YH;Nurieva RI;Kurosaki T;Dong C

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体液免疫,包括抗体转换和体细胞超突变,是由CD 4 + T细胞的关键调节。滤泡辅助性T细胞(Tfh)是一种独特的T细胞亚群,在生殖中心的反应中起重要作用。Tfh细胞发育和功能的转录调控尚未得到很好的理解。在这里,我们报告,CCAAT增强子结合蛋白α(C/EBPα),一个碱性区域/亮氨酸拉链(bzip)转录因子,在Tfh细胞中高度表达。Cebpa缺陷型CD 4 + T细胞在体外和体内表现出增强的IFN-γ表达。T细胞特异性Cebpa敲除(KO)小鼠虽然在Tfh细胞生成方面没有缺陷,但在用蛋白抗原免疫后产生显著增加水平的IgG 2a/B和IgG 3。此外,C/EBPα与Ifng基因结合,并以DNA结合依赖性方式抑制T-bet驱动的Ifng转录。因此,我们的研究表明,C/EBPα限制T细胞中IFN-γ的表达,以允许B细胞进行适当的类别转换。
Humoral immunity, including antibody switching and somatic hypermutation, is critically regulated by CD4+ T cells. T follicular helper (Tfh) cells have been recently shown to be a distinct T cell subset important in germinal center reations. The transcriptional regulation of Tfh cell development and function has not been well understood. Here, we report that the CCAAT enhancer binding protein alpha (C/EBPα), a basic region/leucine zipper (bzip) transcription factor, is highly expressed in Tfh cells. Cebpa-deficient CD4+ T cells exhibit enhanced IFN-γ expression in vitro and in vivo. T cell-specific Cebpa knockout (KO) mice, though not defective in Tfh cell generation, produce significantly increased levels of IgG2a/b and IgG3 following immunization with a protein antigen. Moreover, C/EBPα binds to the Ifng gene and inhibits T-bet-driven Ifng transcription in a DNA binding-dependent manner. Our study thus demonstrates that C/EBPα restricts IFN-γ expression in T cells to allow proper class switching by B cells.
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