病毒感染可诱导宿主细胞产生内质网应激(ERS)与未折叠蛋白反应(UPR),导致内质网稳态失衡.为了探讨异绿原酸A(IAA)在调节小反刍兽疫病毒(PPRV)诱导的ERS和UPR中的作用机制,采用MTT试验、间接免疫荧光试验和 Western blot评估IA A的抗PPRV活性;采用 Western blot和实时荧光定量PCR观察IA A对PPRV诱导的ERS及PERK信号通路的影响.结果表明,IAA能显著抑制PPRV在LDG-2细胞中的复制及病毒诱导的细胞病变,显著提高病毒感染细胞的存活率;与病毒对照组相比,IAA处理的PPRV感染细胞中GRP78和PPRV表达水平、p-PERK/PERK和p-eIF2α/eIF2α比值均显著降低;GADD153表达水平则在病毒感染24、36 h显著降低,在48、60 h显著升高.用4-PBA阻断PPRV诱导的ERS,IAA和4-PBA+IAA处理PPRV感染细胞中GRP78、PPRV-N蛋白、GADD153的表达水平及p-eIF2α/eIF2α、p-PERK/PERK比值均显著降低.由此可见,IAA可通过抑制PERK-eIF2 α-GADD1 53信号通路的激活缓解PPRV感染诱导的ERS,从而抑制病毒在宿主细胞的复制.
Isochlorogenic acid A alleviates reticulum stress induced by peste des petits rumi-nants virus via PERK signaling pathway
Viral infection can induce endoplasmic reticulum stress(ERS)and unfolded protein re-sponse(UPR)in host cells,resulting in perturbation of endoplasmic reticulum homeostasis.To e-lucidate the action mechanism of isochlorogenic acid A(IAA)in regulating peste des petits rumi-nant virus(PPRV)-induced ERS and UPR,MTT assay,indirect immunofluorescence assay and Western blot were used to evaluate the anti-PPRV activity of IAA,and the effects of IAA on PPRV-induced ERS and PERK signaling pathway were studied by Western blot and quantitative real-time PCR.The results showed that the PPRV replication and virus-induced cytopathic in LDG-2 cells were significantly inhibited,and the survival rate of virus-infected cells was significantly in-creased due to IAA treatment.Compared with the virus control group,the expression levels of GRP78 and p-eIF2α,the ratios of p-PERK/PERK and p-eIF2α/eIF2α in IAA treated PPRV-infec-ted cells were significantly decreased.The expression level of GADD153 significantly decreased at 24,36 h,and significantly increased at 48,60 h.Furthermore,treatment with ERS inhibitor 4-PBA could significantly suppress the expression levels of GRP78,PPRV-N protein and GADD153 in PPRV-infected cells,and the ratios of p-eIF2α/eIF2α and p-PERK/PERK in PPRV-infected cells were also significantly decreased caused by treatment with IAA or 4-PBA and IAA combination.These findings implicated that the PPRV-induced ERS could be alleviated by inhibiting activation of the PERK-eIF2α-GADD1 53 signaling pathway,which led to restriction of PPRV replication in host cells.
isochlorogenic acid A(IAA)peste des petits ruminant virus(PPRV)reticulum stress(ERS)PERK signaling pathway
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