TLR2 Activation Limits Rhinovirus-Stimulated CXCL-10 by Attenuating IRAK-1-Dependent IL-33 Receptor Signaling in Human Bronchial Epithelial Cells.

TLR2 Activation Limits Rhinovirus-Stimulated CXCL-10 by Attenuating IRAK-1-Dependent IL-33 Receptor Signaling in Human Bronchial Epithelial Cells.
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DOI:
10.4049/jimmunol.1502702
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发表时间:
2016-09-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Sajjan US
Sajjan US
中科院分区:
其他
文献类型:
--
作者:
Ganesan S;Pham D;Jing Y;Farazuddin M;Hudy MH;Unger B;Comstock AT;Proud D;Lauring AS;Sajjan US

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呼吸道上皮细胞是鼻病毒(RV)感染的主要靶点,表达促炎趋化因子和抗病毒细胞因子,在先天免疫中发挥作用。此前,我们证明了RV与TLR2的相互作用导致呼吸道上皮细胞和巨噬细胞中IRAK-1的耗竭。此外,TLR2激活引起的IRAK-1降解被证明可以抑制单链RNA诱导的树突状细胞中干扰素(IFN)的表达。因此,在本研究中,我们研究了TLR2和IRAK-1在轮状病毒诱导的干扰素-β、干扰素-λ1和CXCL-10中的作用。在呼吸道上皮细胞中,阻断TLR2可增强RV诱导的IFN和CXCL-10的表达。相反,IRAK-1抑制RV诱导的CXCL-10的表达,但不能阻断IFN的表达。中和IL-33或其受体ST2,这需要IRAK-1作为信号转导抑制RV刺激的CXCL-10的表达。此外,RV还可诱导呼吸道上皮细胞表达ST2和IL-33。然而,在巨噬细胞中,RV刺激的CXCL-10的表达主要依赖于TLR2/IL-1受体。有趣的是,在鼻病毒感染的小鼠模型中,阻断ST2不仅可以减轻轮状病毒诱导的CXCL-10,还可以减轻肺部炎症。最后,流感和呼吸道合胞病毒诱导的CXCL-10也被发现部分依赖于呼吸道上皮细胞中的IL-33/ST2/IRAK-1信号。总之,我们的结果表明,RV通过IL-33/ST2信号轴刺激CXCL-10的表达,而TLR2信号至少通过IRAK-1缺失来限制RV诱导的CXCL-10的表达。据我们所知,这是第一个证明呼吸道病毒诱导的IL-33在诱导CXCL-10在呼吸道上皮细胞中的作用的报道。
Airway epithelial cells are the major target for rhinovirus (RV) infection and express pro-inflammatory chemokines and antiviral cytokines that play a role in innate immunity. Previously, we demonstrated that RV interaction with TLR2 causes IRAK-1 depletion in both airway epithelial cells and macrophages. Further, IRAK-1 degradation caused by TLR2 activation was shown to inhibit single stranded RNA-induced interferons (IFN) expression in dendritic cells. Therefore, in this study, we examined the role of TLR2 and IRAK-1 in RV-induced IFN-β, IFN- λ1 and CXCL-10, which require signaling by viral RNA. In airway epithelial cells, blocking TLR2 enhanced RV-induced expression of IFNs and CXCL-10. By contrast, IRAK-1 inhibition abrogated RV-induced expression of CXCL-10, but not IFNs in these cells Neutralization of IL-33 or its receptor, ST2, which requires IRAK-1 for signaling inhibited RV-stimulated CXCL-10 expression. Additionally, RV induced expression of both ST2 and IL-33 in airway epithelial cells. In macrophages, however, RV-stimulated CXCL-10 expression was primarily dependent on TLR2/IL-1 receptor. Interestingly, in a mouse model of rhinovirus infection, blocking ST2 not only attenuated RV-induced CXCL-10, but also lung inflammation. Finally, influenza and respiratory syncytial virus-induced CXCL-10 was also found to be partially dependent on IL-33/ST2/IRAK-1 signaling in airway epithelial cells. Together our results indicate that RV-stimulates CXCL-10 expression via IL-33/ST2 signaling axis, and that TLR2 signaling limits RV-induced CXCL-10 via IRAK-1 depletion at least in airway epithelial cells. To our knowledge, this is the first report to demonstrate the role of respiratory virus induced IL-33 in the induction of CXCL-10 in airway epithelial cells.
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