Autophagy proteins suppress protective type I interferon signalling in response to the murine gut microbiota.

Autophagy proteins suppress protective type I interferon signalling in response to the murine gut microbiota.
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DOI:
10.1038/s41564-018-0229-0
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发表时间:
2018-10
影响因子:
28.3
通讯作者:
Cadwell K
Cadwell K
中科院分区:
生物学1区
文献类型:
--
作者:
Martin PK;Marchiando A;Xu R;Rudensky E;Yeung F;Schuster SL;Kernbauer E;Cadwell K

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作为一条位于宿主防御和细胞内稳态之间的保守途径,自噬是免疫反应的变阻器。特别是,自噬抑制了对病毒核酸的过量I型干扰素(干扰素-I)的产生。目前尚不清楚自噬的这种功能与肠道屏障之间的关系,在肠道屏障中,宿主与微生物的相互作用是普遍和持久的。在这里,我们证明了自噬蛋白缺乏的小鼠可以通过依赖于干扰素-I信号和核酸传感通路的方式来保护小鼠免受肠道细菌病原体轮状柠檬酸的侵袭。无感染的自噬缺陷小鼠肠道组织中干扰素刺激基因(ISG)的表达增强是由肠道微生物区系介导的。此外,渗透到自噬缺陷的肠道微环境中的单核细胞表现出增强的炎症特征,对于保护轮状芽胞杆菌是必要的。最后,我们证明了发生在自噬缺陷宿主中的依赖微生物区系的干扰素-I的产生也可以保护肠道免受化学损伤。因此,自噬蛋白阻止对微生物区系的自发干扰素-I反应,这在存在感染性和非感染性肠道危害时是有益的。这些结果证实了自噬蛋白在控制肠道屏障中干扰素-I信号的大小中所起的作用。
As a conserved pathway that lies at the intersection between host defense and cellular homeostasis, autophagy serves as a rheostat for immune reactions. In particular, autophagy suppresses excess type I interferon (IFN-I) production in response to viral nucleic acids. It is unknown how this function of autophagy relates to the intestinal barrier where host-microbe interactions are pervasive and perpetual. Here, we demonstrate that mice deficient in autophagy proteins are protected from the intestinal bacterial pathogen Citrobacter rodentium in a manner dependent on IFN-I signaling and nucleic acid sensing pathways. Enhanced IFN-stimulated gene (ISG) expression in intestinal tissue of autophagy-deficient mice in the absence of infection was mediated by the gut microbiota. Additionally, monocytes infiltrating into the autophagy-deficient intestinal microenvironment displayed an enhanced inflammatory profile and were necessary for protection against C. rodentium. Finally, we demonstrate that the microbiota-dependent IFN-I production that occurs in the autophagy-deficient host also protects against chemical injury of the intestine. Thus, autophagy proteins prevent a spontaneous IFN-I response to microbiota that is beneficial in the presence of infectious and non-infectious intestinal hazards. These results identify a role for autophagy proteins in controlling the magnitude of IFN-I signaling at the intestinal barrier.
DOI: 10.1038/nature13960
发表时间: 2014-12-04
期刊: NATURE
影响因子: 64.8
作者:
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发表时间: 2016-11
期刊: Nature reviews. Immunology
影响因子: --
作者:
Cadwell K
通讯作者: Cadwell K