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Toll 样受体 4 信号通路从细菌外膜囊泡中许可脂多糖的胞质转运。

Toll-Like Receptor 4 Signaling Licenses the Cytosolic Transport of Lipopolysaccharide From Bacterial Outer Membrane Vesicles.

机构信息

Department of Hematology and Key Laboratory of Non-Resolving Inflammation and Cancer of Human Province, The 3rd Xiangya Hospital, Central South University, Changsha, Hunan Province, PR China.

Key Laboratory of Medical Genetics, School of Biological Science and Technology, Central South University, Changsha, Hunan Province, PR China.

出版信息

Shock. 2019 Feb;51(2):256-265. doi: 10.1097/SHK.0000000000001129.

Abstract

Outer membrane vesicles (OMVs), released by variety of bacteria, are membrane-enclosed entities enriched in microbial components, toxins, and virulent factors. OMVs could deliver lipopolysaccharide (LPS) into the cytosol of host cells and subsequently activate caspase-11, which critically orchestrates immune responses and mediates septic shock. Although it is known that caspase-11 is activated by intracellular LPS, how OMVs deliver LPS into the cytosol remains largely unknown. Here we show that the activation of toll-like receptor 4 (TLR4), a LPS receptor on the cytoplasmic membrane, licenses macrophages to transport LPS from OMVs into the cytosol through TIR domain-containing adaptor-inducing interferon-β (TRIF). TRIF-mediated cytosolic delivery of LPS from OMVs depends on the production of type 1 interferon and the expression of guanylate-binding proteins (GBPs). Deletion of TRIF or GBPs prevents pyroptosis and lethality induced by OMVs or OMVs-releasing Escherichia coli. Together, these findings provide novel insight into how host coordinates extracellular and intracellular LPS sensing to orchestrate immune responses during gram-negative bacterial infection.

摘要

外膜囊泡(OMVs)是各种细菌释放的一种膜包裹的实体,富含微生物成分、毒素和毒力因子。OMVs 可以将脂多糖(LPS)递送到宿主细胞的细胞质中,随后激活半胱天冬酶-11,后者对免疫反应进行关键的协调并介导败血症休克。尽管已知细胞内 LPS 激活半胱天冬酶-11,但 OMVs 如何将 LPS 递送到细胞质中仍然很大程度上未知。在这里,我们表明,细胞质膜上 LPS 受体 toll 样受体 4(TLR4)的激活,使巨噬细胞能够通过 TIR 结构域包含衔接子诱导干扰素-β(TRIF)将 LPS 从 OMVs 转运到细胞质中。TRIF 介导的 OMVs 来源 LPS 向细胞质中的转运依赖于 I 型干扰素的产生和鸟苷酸结合蛋白(GBPs)的表达。TRIF 或 GBPs 的缺失可防止 OMVs 或释放 OMVs 的大肠杆菌引起的细胞焦亡和致死。总之,这些发现为宿主如何协调革兰氏阴性菌感染期间细胞外和细胞内 LPS 感应以协调免疫反应提供了新的见解。

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