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4E-BP1 和 4E-BP2 对 Ccl5 和 Cxcl10 的翻译抑制作用抑制了小鼠巨噬细胞诱导活化 T 细胞迁移的能力。

Translational repression of Ccl5 and Cxcl10 by 4E-BP1 and 4E-BP2 restrains the ability of mouse macrophages to induce migration of activated T cells.

机构信息

INRS - Institut Armand-Frappier, Laval, Quebec, Canada.

Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.

出版信息

Eur J Immunol. 2019 Aug;49(8):1200-1212. doi: 10.1002/eji.201847857. Epub 2019 May 6.

Abstract

Signaling through the mechanistic target of rapamycin complex 1 (mTORC1) is a major regulatory node of pro-inflammatory mediator production by macrophages (MΦs). However, it is still unclear whether such regulation relies on selective translational control by two of the main mTORC1 effectors, the eIF4E-binding proteins 1 and 2 (4E-BP1/2). By comparing translational efficiencies of immune-related transcripts of MΦs from WT and 4E-BP1/2 double-KO (DKO) mice, we found that translation of mRNAs encoding the pro-inflammatory chemokines CCL5 and CXCL10 is controlled by 4E-BP1/2. Macrophages deficient in 4E-BP1/2 produced higher levels of CCL5 and CXCL10 upon LPS stimulation, which enhanced chemoattraction of activated T cells. Consistent with this, treatment of WT cells with mTORC1 inhibitors promoted the activation of 4E-BP1/2 and reduced CCL5 and CXCL10 secretion. In contrast, the phosphorylation status of eIF4E did not affect the synthesis of these chemokines since MΦs derived from mice harboring a non-phosphorylatable form of the protein produced similar levels of CCL5 and CXCL10 to WT counterparts. These data provide evidence that the mTORC1-4E-BP1/2 axis contributes to regulate the production of chemoattractants by MΦs by limiting translation efficiency of Ccl5 and Cxcl10 mRNAs, and suggest that 4E-BP1/2 act as immunological safeguards by fine-tuning inflammatory responses in MΦs.

摘要

mTORC1 复合物 1(mTORC1)的信号转导是巨噬细胞(MΦs)产生促炎介质的主要调节节点。然而,目前尚不清楚这种调节是否依赖于两个主要的 mTORC1 效应物,即 eIF4E 结合蛋白 1 和 2(4E-BP1/2)的选择性翻译控制。通过比较 WT 和 4E-BP1/2 双敲除(DKO)小鼠 MΦ 中免疫相关转录物的翻译效率,我们发现编码促炎趋化因子 CCL5 和 CXCL10 的 mRNAs 的翻译受 4E-BP1/2 控制。缺乏 4E-BP1/2 的巨噬细胞在 LPS 刺激下产生更高水平的 CCL5 和 CXCL10,从而增强了激活的 T 细胞的趋化吸引力。与此一致,用 mTORC1 抑制剂处理 WT 细胞可促进 4E-BP1/2 的激活,并减少 CCL5 和 CXCL10 的分泌。相比之下,eIF4E 的磷酸化状态并不影响这些趋化因子的合成,因为携带蛋白非磷酸化形式的小鼠来源的 MΦ 产生与 WT 对应物相似水平的 CCL5 和 CXCL10。这些数据提供了证据表明,mTORC1-4E-BP1/2 轴通过限制 Ccl5 和 Cxcl10 mRNAs 的翻译效率来调节 MΦ 产生趋化因子,并且表明 4E-BP1/2 通过微调 MΦ 中的炎症反应来充当免疫保护机制。

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