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:
影响因子:
--
通讯作者:
Sajjan US
中科院分区:
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
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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发表时间:
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期刊:
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期刊:
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