IFN-γ regulates survival and function of tumor-induced CD11b+ Gr-1high myeloid derived suppressor cells by modulating the anti-apoptotic molecule Bcl2a1.

IFN-γ regulates survival and function of tumor-induced CD11b+ Gr-1high myeloid derived suppressor cells by modulating the anti-apoptotic molecule Bcl2a1.
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IFN-γ 通过调节抗凋亡分子 Bcl2a1 来调节肿瘤诱导的 CD11b+ Gr-1 高骨髓源性抑制细胞的存活和功能。

DOI:
10.1002/eji.201444497
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发表时间:
2014-08
影响因子:
5.4
通讯作者:
Greten, Tim F.
Greten, Tim F.
中科院分区:
医学3区
文献类型:
--
作者:
Medina-Echeverz, Jose;Haile, Lydia A.;Zhao, Fei;Gamrekelashvili, Jaba;Ma, Chi;Metais, Jean-Yves;Dunbar, Cynthia E.;Kapoor, Veena;Manns, Michael P.;Korangy, Firouzeh;Greten, Tim F.

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骨髓源性抑制细胞 (MDSC) 在抑制癌症和炎症免疫反应中发挥着关键作用。在这里,我们描述了细胞因子对 Bcl2a1 的调节如何控制 CD11b+Gr-1 高粒细胞 MDSC 的抑制功能。将 CD11b+Gr-1high 粒细胞 MDSC 与抗原刺激的 T 细胞共培养,并使用抗 IFN-γ 阻断抗体、IFN-γ−/− 效应 T 细胞、IFN-γR−/− MDSC 或 STAT1−/− MDSC 同时阻断 IFN-γ,导致 Bcl2a1 上调 CD11b+Gr-1high 细胞,提高存活率并增强其抑制功能。分子研究表明,抗原刺激的 CD8+ T 细胞释放的 GM-CSF 会诱导 Bcl2a1 上调,而在 IFN-γ 存在的情况下,磷酸化 STAT-1 与 Bcl2a1 启动子的直接相互作用会抑制上调。过表达 Bcl2a1 的粒细胞 MDSC 在体外表现出存活时间延长和抑制功能增强。我们的数据表明,Bcl2a1 的 IFN-γ/STAT1 依赖性调节可调节粒细胞 MDSC 的存活,从而抑制其功能。
Myeloid derived suppressor cells (MDSCs) play a critical role in suppression of immune responses in cancer and inflammation. Here, we describe how regulation of Bcl2a1 by cytokines controls the suppressor function of CD11b+Gr-1high granulocytic MDSCs. Co-culture of CD11b+Gr-1high granulocytic MDSCs with antigen-stimulated T cells and simultaneous blockade of IFN-γ by the use of anti-IFN-γ blocking antibody, IFN-γ−/− effector T cells, IFN-γR−/− MDSCs or STAT1−/− MDSCs led to up-regulation of Bcl2a1 in CD11b+Gr-1high cells, improved survival and enhanced their suppressor function. Molecular studies revealed that GM-CSF released by antigen-stimulated CD8+ T cells induced Bcl2a1 up-regulation, which was repressed in the presence of IFN-γ by a direct interaction of phosphorylated STAT-1 with the Bcl2a1 promotor. Bcl2a1 overexpressing granulocytic MDSCs demonstrated prolonged survival and enhanced suppressor function in vitro. Our data suggest that IFN-γ/ STAT1-dependent regulation of Bcl2a1 regulates survival and thereby suppressor function of granulocytic MDSCs.
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