TLR4-MyD88/Mal-NF-kB axis is involved in infection of HSV-2 in human cervical epithelial cells.

TLR4-MyD88/Mal-NF-kB axis is involved in infection of HSV-2 in human cervical epithelial cells.
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DOI:
10.1371/journal.pone.0080327
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Li H
Li H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Liu H;Chen K;Feng W;Wu X;Li H

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我们建立了人宫颈上皮细胞(HSV-2的主要靶细胞和自然宿主细胞)体外HSV-2急性感染模型,以探讨TLRs介导的HSV-2天然免疫应答的作用。在目前的研究中,我们利用shRNA和TLR4拮抗剂的方法发现,HSV-2感染诱导的核因子-kB的活性和细胞因子的表达是TLR4依赖的。基因敲除实验表明,在HSV-2诱导的HCE细胞TLR4依赖的NF-kB活化过程中,TLRs信号通路的适配分子MyD88和MAL是必需的。Western印迹分析表明,TLR4基因敲除可降低单纯疱疹病毒感染后IRAK1和核因子-kB抑制因子(IkB-α)的磷酸化水平。ELISA法分析,TLR4或MyD88/MAL单独或两者表达降低均可显著抑制IL-6和干扰素-β的产生。综上所述,我们的体外感染模型的结果首次揭示了人宫颈上皮细胞存在TLR4-MAL/MyD88-IRAK1-NF-kB轴应答HSV-2感染的途径。
We have established an in vitro HSV-2 acute infection model with Human cervical epithelial (HCE cells, the primary target and natural host cells for HSV-2) to investigate the role of TLRs-mediated innate immune response to HSV-2. In current study, we found that HSV-2 infection induced activity of NF-kB reporter and expression of cytokines are TLR4-dependent using approaches with shRNA and TLR4 antagonist. Knockdown experiments demonstrated that the adaptor molecules MyD88 and Mal of the TLRs signaling pathway are required in the HSV-2 induced TLR4-dependent NF-kB activation in HCE cells. Western blot assay suggested that knockdown of TLR4 decreased the phosphorylation of IRAK1 and inhibitor of NF-kB (IkB-α) upon HSV-2 infection. Finally, decreased expression of either TLR4 or MyD88/Mal alone or both significantly abolished productions of IL-6 and IFN-β by ELISA analysis. Taken together, our results from the in vitro infection model reveal for the first time that there exists the pathway via TLR4-Mal/MyD88-IRAK1-NF-kB axis in human cervical epithelial cells in response to HSV-2 infection.
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