MKL-1 is a coactivator for STAT5b, the regulator of Treg cell development and function

MKL-1 is a coactivator for STAT5b, the regulator of Treg cell development and function
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MKL-1 是 STAT5b 的共激活剂,STAT5b 是 Treg 细胞发育和功能的调节因子

DOI:
10.1186/s12964-020-00574-1
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发表时间:
2020-07
影响因子:
8.4
通讯作者:
Xing Hua Liao
Xing Hua Liao
中科院分区:
生物学2区
文献类型:
--
作者:
Yuan Xiang;Jun Wang;Jia Peng Li;Wei Guo;Feng Huang;Hui Min Zhang;Han Han Li;Zhou Tong Dai;Zi Jian Zhang;Hui Li;Le Yuan Bao;Chao Jiang Gu;Kun Chen;Tong Cun Zhang;Xing Hua Liao

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背景Foxp3+CD4+调节性T细胞(Treg)构成自身免疫性疾病的关键事件。 STAT5b是IL-2/15和FOXP3(Treg细胞的主要调节因子)之间的关键环节。方法CD3+T细胞和Foxp3+CD4+调节性T细胞过表达或敲低MKL-1和STAT5a,并测试Treg细胞的发育和功能。通过免疫共沉淀测定、荧光素酶测定、免疫荧光染色和酵母双杂交筛选分析 MKL-1 和 STAT5a 的直接相互作用。通过qPCR、蛋白质印迹和流式细胞术分析MKL-1和STAT5a对Treg基因表达的影响。结果然而,介导STAT5b依赖性Treg基因表达以及自身免疫性疾病中Treg细胞表型和功能的分子机制尚不清楚。在此,我们报告 MKL-1 是主要 Treg 基因转录因子 STAT5b 的共激活因子,这是人类 Treg 细胞表型和功能所必需的。 STAT5b 的 N 末端包含一个基本的卷曲螺旋蛋白-蛋白相互作用结构域,可结合 MKL-1 的 C 端激活结构域,并增强 MKL-1 介导的 Treg 特异性、含有 CArG 的启动子(包括 Treg 特异性基因 Foxp3)的转录激活。通过特定的小干扰 RNA 抑制内源性 STAT5b 表达会减弱培养的人类细胞中的 MKL-1 转录激活。 STAT5b-MKL-1 相互作用确定了 Treg 特异性基因调控的作用,并调节小鼠 Treg 细胞的发育和功能,并提出了对自身免疫性疾病特发性血小板减少性紫癜 (ITP) 的保护作用的可能机制。 结论我们的研究首次证明 MKL-1 是 STAT5b 的共激活剂,STAT5b 是 Treg 细胞发育和功能的调节剂。 功能.视频摘要
BackgroundFoxp3+CD4+regulatory T cells (Treg) constitutes a key event in autoimmune diseases. STAT5b is the critical link between the IL-2/15 and FOXP3, the master regulator of Treg cells.MethodsThe CD3+T cell and Foxp3+CD4+regulatory T cells were overexpressioned or knockdown MKL-1 and STAT5a and tested for Treg cell development and function. Direct interaction of MKL-1 and STAT5a were analyzed by coimmunoprecipitation assays, Luciferase assay, Immunofluoresence Staining and Yeast two-hybrid screening. The effect of MKL-1 and STAT5a on the Treg genes expression was analyzed by qPCR and western blotting and Flow cytometry.ResultsHowever, the molecular mechanisms mediating STAT5b-dependent Treg genes expression and Treg cell phenotype and function in autoimmune diseases are not well defined. Here, we report that the MKL-1 is a coactivator for the major Treg genes transcription factor STAT5b, which is required for human Treg cell phenotype and function. The N terminus of STAT5b, which contains a basic coiled-coil protein–protein interaction domain, binds the C-terminal activation domain of MKL-1 and enhances MKL-1 mediated transcriptional activation of Treg-specific, CArG containing promoters, including the Treg-specific genes Foxp3. Suppression of endogenous STAT5b expression by specific small interfering RNA attenuates MKL-1 transcriptional activation in cultured human cells. The STAT5b–MKL-1 interaction identifies a role of Treg-specific gene regulation and regulated mouse Treg cell development and function and suggests a possible mechanism for the protective effects of autoimmune disease Idiopathic Thrombocytopenic Purpura (ITP).ConclusionsOur studies demonstrate for the first time that MKL-1 is a coactivator for STAT5b, the regulator of Treg cell development and function.Video abstract
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