Although microRNA-155 (miR-155) is considered a pro-inflammatory mediator, cumulative evidence indicates that it also has anti-inflammatory effects in macrophages and dendritic cells. In this study, we identified the dramatic expression changes of more than half of potential miR-155-targeted genes upon lipopolysaccharide (LPS) stimulation; 223 genes were down-regulated and 85 genes were up-regulated, including suppressor of cytokine signaling 1 (SOCS1) and transforming growth factor-β-activated kinase 1-binding protein 2 (TAB2), two well-known genes involved in miR-155-mediated regulation of the Toll-like receptor 4 (TLR4) signaling pathway. We also found that miR-155 acted as an anti-inflammatory mediator in the initial stage of LPS-induced inflammatory response mainly through repressing TAB2 protein translation, and as a pro-inflammatory mediator by down-regulating SOCS1 in the later stage. Meanwhile, overexpression of TAB2 3′ untranslated region (UTR) in macrophages promoted the development of endotoxin tolerance by competing for binding with miR-155, which resulted in an elevated expression level of SOCS1 protein. These findings provide new insights for understanding the regulatory mechanisms in fine-tuning of LPS-induced innate immune response.
采用二代转录组测序检测脂多糖刺激下的巨噬细胞内miR-155靶基因池的改变;并分析核糖体测序数据验证miR-155的靶基因的翻译效率;采用实时定量聚合酶链反应(RT-qPCR)和免疫印迹(western blotting)明确靶基因的表达;采用荧光素酶报告基因系统和生物素介导的microRNA pulldown技术明确miR-155和靶基因在不同时相的结合;通过脂多糖体外刺激巨噬细胞, 建立内毒素耐受模型, 并采用酶联免疫吸附测定(ELISA)检测炎症因子的分泌水平.
miR-155在脂多糖诱导的炎症早期起到抑制炎症应答的作用, 中后期发挥促炎效应. 这种相反的效应是由于巨噬细胞炎症应答过程中miR-155的Toll样受体4(TLR4)信号相关靶基因TAB2和SOCS1的相对丰度改变造成的. 同时, TAB2通过ceRNA机制减弱miR-155对SOCS1的抑制, 促进内毒素耐受状态的形成.
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This work was supported by the National Natural Science Foundation of China (Nos. 81701568, 81930041, 81571524, 81872248, and 91842103) and the Zhejiang Provincial Natural Science Foundation of China (Nos. Y15C080001 and Z19H100001). We would also like to thank the Zhejiang Provincial Key Laboratory for Immunity and Inflammatory Diseases for its support.
Yuhua LIU, Xiaopeng WAN, Yuan YUAN, Jingjing HUANG, Yijia JIANG, Kaiyue ZHAO, Yan WANG, and Yang LIU performed the experimental research and data analysis. Qingqing WANG and Hongchuan JIN contributed to the study design and data analysis. Yang LIU, Qingqing WANG, and Hongchuan JIN contributed to the writing and editing of the manuscript. All authors have read and approved the final manuscript and, therefore, have full access to all the data in the study and take responsibility for the integrity and security of the data.
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Yuhua LIU, Xiaopeng WAN, Yuan YUAN, Jingjing HUANG, Yijia JIANG, Kaiyue ZHAO, Yan WANG, Yang LIU, Qingqing WANG, and Hongchuan JIN declare that they have no conflict of interest.
This article does not contain any studies with human subjects performed by any of authors.
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Liu, Y., Wan, X., Yuan, Y. et al. Opposite effects of miR-155 in the initial and later stages of lipopolysaccharide (LPS)-induced inflammatory response. J. Zhejiang Univ. Sci. B 22, 590–598 (2021). https://doi.org/10.1631/jzus.B2000826
- Toll-like receptor 4 (TLR4)
- Endotoxin tolerance
- MicroRNA-155 (miR-155)
- Suppressor of cytokine signaling 1 (SOCS1)
- Transforming growth factor-β-activated kinase 1-binding protein 2 (TAB2)