Listeria exploits IFITM3 to suppress antibacterial activity in phagocytes.

Listeria exploits IFITM3 to suppress antibacterial activity in phagocytes.
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李斯特氏菌利用IFITM3以抑制吞噬细胞中的抗菌活性。

DOI:
10.1038/s41467-021-24982-0
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发表时间:
2021-08-17
影响因子:
16.6
通讯作者:
Brumell JH
Brumell JH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tan JMJ;Garner ME;Regeimbal JM;Greene CJ;Márquez JDR;Ammendolia DA;McCluggage ARR;Li T;Wu KJ;Cemma M;Ostrowski PP;Raught B;Diamond MS;Grinstein S;Yates RM;Higgins DE;Brumell JH

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I型干扰素(IFN)信号通路在抵抗病毒感染中具有重要作用,下游诱导干扰素刺激基因(ISG)保护宿主免受病毒入侵、复制和传播。单核增生李斯特菌(Lm)是一种兼性细胞内食源性病原体,可以利用I型干扰素反应作为其致病策略的一部分,但所涉及的分子机制尚不清楚。在这里,我们发现I型IFN抑制吞噬细胞的抗菌活性,促进全身Lm感染。在机制上,I型IFN抑制吞噬体成熟和Lm毒力因子ActA和LLO的蛋白水解,从而促进吞噬体逃逸和细胞间扩散;这种I型ifn介导的改变需要抗病毒蛋白ifn诱导的跨膜蛋白3 (IFITM3)。Ifitm3−/−小鼠对Lm的全身性感染具有抗性,表现出细菌在组织中的传播减少,免疫细胞募集和促炎细胞因子信号传导增加。总之,我们的研究结果显示了吞噬细胞中的抗病毒机制如何被细菌病原体利用,并暗示IFITM3是一种潜在的抗菌治疗靶点。干扰素(IFN)是抗病毒免疫的重要组成部分,但也可以被细菌利用来进行免疫逃避。本文作者表明,单核增生李斯特菌(Listeria monocytogenes, Lm)诱导I型IFN抑制Lm毒力蛋白、ActA和LLO的降解,并以ifitm3依赖的方式促进Lm感染,从而暗示了抗菌治疗的潜在靶点。
The type I interferon (IFN) signaling pathway has important functions in resistance to viral infection, with the downstream induction of interferon stimulated genes (ISG) protecting the host from virus entry, replication and spread. Listeria monocytogenes (Lm), a facultative intracellular foodborne pathogen, can exploit the type I IFN response as part of their pathogenic strategy, but the molecular mechanisms involved remain unclear. Here we show that type I IFN suppresses the antibacterial activity of phagocytes to promote systemic Lm infection. Mechanistically, type I IFN suppresses phagosome maturation and proteolysis of Lm virulence factors ActA and LLO, thereby promoting phagosome escape and cell-to-cell spread; the antiviral protein, IFN-induced transmembrane protein 3 (IFITM3), is required for this type I IFN-mediated alteration. Ifitm3−/− mice are resistant to systemic infection by Lm, displaying decreased bacterial spread in tissues, and increased immune cell recruitment and pro-inflammatory cytokine signaling. Together, our findings show how an antiviral mechanism in phagocytes can be exploited by bacterial pathogens, and implicate IFITM3 as a potential antimicrobial therapeutic target. Interferon (IFN) is an important component of antiviral immunity, but can also be exploited by bacteria for immune evasion. Here the authors show that Listeria monocytogenes (Lm) induces type I IFN to suppress the degradation of Lm virulence proteins, ActA and LLO, and promote Lm infection in an IFITM3-dependent manner, thereby hinting at a potential target for antimicrobial therapy.
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