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埃博拉病毒样颗粒通过 Toll 样受体和干扰素信号通路刺激 I 型干扰素和前炎症细胞因子的表达。

Ebola virus-like particles stimulate type I interferons and proinflammatory cytokine expression through the toll-like receptor and interferon signaling pathways.

机构信息

1 Program in Genomics of Differentiation, National Institute of Child Health and Human Development , National Institutes of Health, Bethesda, Maryland.

出版信息

J Interferon Cytokine Res. 2014 Feb;34(2):79-89. doi: 10.1089/jir.2013.0035. Epub 2013 Oct 8.

Abstract

Ebola viruses (EBOV) can cause severe hemorrhagic disease with high case fatality rates. Currently, no vaccines or therapeutics are approved for use in humans. Ebola virus-like particles (eVLP) comprising of virus protein (VP40), glycoprotein, and nucleoprotein protect rodents and nonhuman primates from lethal EBOV infection, representing as a candidate vaccine for EBOV infection. Previous reports have shown that eVLP stimulate the expression of proinflammatory cytokines in dendritic cells (DCs) and macrophages (MΦs) in vitro. However, the molecular mechanisms and signaling pathways through which eVLP induce innate immune responses remain obscure. In this study, we show that eVLP stimulate not only the expression of proinflammatory cytokines but also the expression of type I interferons (IFNs) and IFN-stimulated genes (ISGs) in murine bone marrow-derived DCs (BMDCs) and MΦs. Our data indicate that eVLP trigger host responses through toll-like receptor (TLR) pathway utilizing 2 distinct adaptors, MyD88 and TRIF. More interestingly, eVLP activated the IFN signaling pathway by inducing a set of potent antiviral ISGs. Last, eVLP and synthetic adjuvants, Poly I:C and CpG DNA, cooperatively increased the expression of cytokines and ISGs. Further supporting this synergy, eVLP when administered together with Poly I:C conferred mice enhanced protection against EBOV infection. These results indicate that eVLP stimulate early innate immune responses through TLR and type I IFN signaling pathways to protect the host from EBOV infection.

摘要

埃博拉病毒(EBOV)可引起严重出血性疾病,病死率高。目前,尚无获准用于人类的疫苗或疗法。由病毒蛋白(VP40)、糖蛋白和核蛋白组成的埃博拉病毒样颗粒(eVLP)可保护啮齿动物和非人类灵长类动物免受致命性埃博拉病毒感染,是埃博拉病毒感染的候选疫苗。先前的报告表明,eVLP 在体外可刺激树突状细胞(DCs)和巨噬细胞(MΦs)中促炎细胞因子的表达。然而,eVLP 诱导固有免疫反应的分子机制和信号通路仍不清楚。在本研究中,我们表明 eVLP 不仅可刺激促炎细胞因子的表达,还可刺激Ⅰ型干扰素(IFN)和 IFN 刺激基因(ISG)在小鼠骨髓来源的 DCs(BMDCs)和 MΦs 中的表达。我们的数据表明,eVLP 通过利用 2 种不同的衔接子 MyD88 和 TRIF 通过 Toll 样受体(TLR)途径触发宿主反应。更有趣的是,eVLP 通过诱导一组有效的抗病毒 ISG 激活 IFN 信号通路。最后,eVLP 和合成佐剂 Poly I:C 和 CpG DNA 协同增加细胞因子和 ISG 的表达。进一步支持这种协同作用,eVLP 与 Poly I:C 联合给药可增强小鼠对 EBOV 感染的保护作用。这些结果表明,eVLP 通过 TLR 和 I 型 IFN 信号通路刺激早期固有免疫反应,从而保护宿主免受 EBOV 感染。

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