The unfolded protein response element IRE1α senses bacterial proteins invading the ER to activate RIG-I and innate immune signaling.

The unfolded protein response element IRE1α senses bacterial proteins invading the ER to activate RIG-I and innate immune signaling.
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DOI:
10.1016/j.chom.2013.03.011
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发表时间:
2013-05-15
影响因子:
30.3
通讯作者:
Lencer WI
Lencer WI
中科院分区:
医学1区
文献类型:
--
作者:
Cho JA;Lee AH;Platzer B;Cross BCS;Gardner BM;De Luca H;Luong P;Harding HP;Glimcher LH;Walter P;Fiebiger E;Ron D;Kagan JC;Lencer WI

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除了高尔基体和内质网(ER)外,质膜和所有膜结合细胞器都配备有模式识别分子,以感知微生物或其产物,并诱导宿主防御的先天免疫。在这里,我们报告了肌醇需要-1 α(IRE 1 α),一种在未折叠蛋白反应(UPR)中发出信号的ER蛋白,被激活,通过结合霍乱毒素的一部分来诱导炎症,因为它会选择ER引起疾病。其他已知的UPR转换器,包括IRE 1 α依赖性转录因子XBP 1,也是这种信号传导的载体。相反,炎症反应依赖于IRE 1 α降解内源性mRNA的RNA酶活性,这一过程称为mRNA的调节性IRE 1 α依赖性衰变(RIDD)。所产生的mRNA片段与视黄酸诱导基因1(RIG-I)(RNA病毒的胞质传感器)接合以激活NF-κB和干扰素途径。我们提出IRE 1 α提供了一种起源于ER腔的先天免疫监视的普遍机制。
The plasma membrane and all membrane-bound organelles except for the Golgi and endoplasmic reticulum (ER) are equipped with pattern-recognition molecules to sense microbes or their products and induce innate immunity for host defense. Here, we report that inositol-requiring-1α (IRE1α), an ER protein that signals in the unfolded protein response (UPR), is activated to induce inflammation by binding a portion of cholera toxin as it co-opts the ER to cause disease. Other known UPR transducers, including the IRE1α-dependent transcription factor XBP1, are dispensable for this signaling. The inflammatory response depends instead on the RNase activity of IRE1α to degrade endogenous mRNA, a process termed regulated IRE1α-dependent decay (RIDD) of mRNA. The mRNA fragments produced engage retinoic-acid inducible gene 1 (RIG-I), a cyto-solic sensor of RNA viruses, to activate NF-κB and interferon pathways. We propose IRE1α provides for a generalized mechanism of innate immune surveillance originating within the ER lumen.
RIG-I 样受体的免疫信号传导。
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