Tristetraprolin inhibits macrophage IL-27-induced activation of antitumour cytotoxic T cell responses.

Tristetraprolin inhibits macrophage IL-27-induced activation of antitumour cytotoxic T cell responses.
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DOI:
10.1038/s41467-017-00892-y
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发表时间:
2017-10-11
影响因子:
16.6
通讯作者:
Liu J
Liu J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang Q;Ning H;Peng H;Wei L;Hou R;Hoft DF;Liu J

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产生IFN-γ的细胞毒性T淋巴细胞对于宿主防御病毒感染和癌症是必不可少的。在这里,我们表明由Zfp 36编码的RNA结合tristetraprolin是体内CD 8 + T细胞产生IFN-γ所需的。然而,当在体外活化时,初始野生型和三曲脯氨酸缺陷型CD 8 + T细胞的IFN-γ产生是相当的。IL-27由三曲脯氨酸缺陷型巨噬细胞过度产生,并在三曲脯氨酸缺陷型小鼠中全身性增加。Tristetraprolin通过促进p28 mRNA降解抑制IL-27的产生。重要的是,在三曲脯氨酸缺陷型小鼠(WSX-1/三曲脯氨酸双敲除)中IL-27受体WSX-1的缺失导致细胞毒性T淋巴细胞数量的减少。此外,不仅在细胞毒性T淋巴细胞耗竭后的三曲脯氨酸缺陷小鼠中,而且在WSX-1/三曲脯氨酸双敲除小鼠中,肿瘤生长加速,肿瘤细胞毒性T淋巴细胞的数量显著减少。本研究描述了一个调节途径IL-27的表达和细胞毒性T淋巴细胞功能介导的tristetraprolin,有助于调节抗肿瘤免疫。IL-27是可以诱导抗肿瘤CD 8 + T细胞应答的多种细胞因子之一。在这里,作者表明,由Zfp 36编码的TTP降解p28以抑制巨噬细胞产生IL-27,从而成为抗肿瘤反应的负调节因子。
IFN-γ-producing cytotoxic T lymphocytes are essential for host defense against viral infection and cancer. Here we show that the RNA-binding tristetraprolin, encoded by Zfp36, is needed for CD8+ T-cell production of IFN-γ in vivo. When activated in vitro, however, IFN-γ production by naive wild type and tristetraprolin-deficient CD8+ T-cells is comparable. IL-27 is overproduced by tristetraprolin-deficient macrophages and increased systemically in tristetraprolin-deficient mice. Tristetraprolin suppresses IL-27 production by promoting p28 mRNA degradation. Importantly, deletion of IL-27 receptor WSX-1 in tristetraprolin-deficient mice (WSX-1/tristetraprolin double knockout) leads to a reduction in cytotoxic T lymphocyte numbers. Moreover, tumor growth is accelerated, not only in tristetraprolin-deficient mice after cytotoxic T lymphocyte depletion, but also in WSX-1/tristetraprolin double knockout mice, with substantial reduction in the number of tumor cytotoxic T lymphocytes. This study describes a regulatory pathway for IL-27 expression and cytotoxic T lymphocyte function mediated by tristetraprolin, contributing to regulation of antitumour immunity. IL-27 is one of a number of cytokines that can induce antitumour CD8+ T cell responses. Here the authors show that TTP, encoded by Zfp36, degrades p28 to inhibit IL-27 production by macrophages and is thereby a negative regulator of the antitumour response.
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