CREB, ATF, and AP-1 transcription factors regulate IFN-gamma secretion by human T cells in response to mycobacterial antigen.

CREB, ATF, and AP-1 transcription factors regulate IFN-gamma secretion by human T cells in response to mycobacterial antigen.
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CREB,ATF和AP-1转录因子调节人类T细胞对分枝杆菌抗原的分泌。

DOI:
10.4049/jimmunol.181.3.2056
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发表时间:
2008-08-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Barnes PF
Barnes PF
中科院分区:
其他
文献类型:
--
作者:
Samten B;Townsend JC;Weis SE;Bhoumik A;Klucar P;Shams H;Barnes PF

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T 细胞产生 IFN-γ 对于防御许多病原体至关重要,而 IFN-γ 的近端启动子(转录起始位点上游的 -73 至 -48 bp)对其表达至关重要。然而,在原代人类细胞中通过该启动子的转录调控机制仍不清楚。我们研究了 CREB/ATF 和 AP-1 转录因子对结核分枝杆菌刺激的人 T 细胞中 IFN-γ 近端启动子的影响。使用EMSA、超移测定和启动子下拉测定,我们证明CREB、ATF-2和c-Jun,但不是环AMP反应元件调节剂ATF-1或c-Fos,在刺激后与IFN-γ的近端启动子结合,并且免疫共沉淀表明这些转录因子之间相互作用的可能性。染色质免疫沉淀证实了这些转录因子在活抗原激活的 T 细胞中募集至 IFN-γ 近端启动子。用显性失活 ATF-2 肽或 siRNA 抑制 T 细胞中的 ATF-2 活性,显着降低 IFN-γ 的表达,并降低 CREB ​​和 c-Jun 的表达。这些发现表明,CREB、ATF-2 和 c-Jun 被招募到 IFN-γ 近端启动子,并响应微生物抗原而上调 IFN-γ 转录。此外,ATF-2 在 T 细胞激活过程中控制 CREB ​​和 c-Jun 的表达。
IFN-γ production by T cells is pivotal for defense against many pathogens, and the proximal promoter of IFN-γ, −73 to −48 bp upstream of the transcription start site, is essential for its expression. However, transcriptional regulation mechanisms through this promoter in primary human cells remain unclear. We studied the effects of CREB/ATF and AP-1 transcription factors on the proximal promoter of IFN-γ in human T cells stimulated with M. tuberculosis. Using EMSA, supershift assays and promoter pulldown assays, we demonstrated that CREB, ATF-2 and c-Jun, but not cyclic AMP response element modulator, ATF-1 or c-Fos, bind to the proximal promoter of IFN-γ upon stimulation, and coimmunoprecipitation indicated the possibility of interaction among these transcription factors. Chromatin immunoprecipitation confirmed the recruitment of these transcription factors to the IFN-γ proximal promoter in live antigen-activated T cells. Inhibition of ATF-2 activity in T-cells with a dominant-negative ATF-2 peptide or with siRNA markedly reduced the expression of IFN-γ and decreased the expression of CREB and c-Jun. These findings suggest that CREB, ATF-2 and c-Jun are recruited to the IFN-γ proximal promoter, and upregulate IFN-γ transcription in response to microbial antigen. In addition, ATF-2 controls expression of CREB and c-Jun during T-cell activation.
对CD4(+)与CD8(+)T细胞的干扰素γ产生中转录的信号换能器和转录激活因子(Stat)4的谱系特异性需求。
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