本研究利用CRISPR/Cas9基因编辑技术构建MAVS基因稳定敲除的细胞株,对流感病毒的增殖特性进行初步研究。设计、构建靶向MAVS基因sgRNA表达载体,与pCAG-Cas9-EGFP表达载体共转染MDCK细胞,经过流式细胞仪分选、PCR、基因测序筛选MAVS敲除...本研究利用CRISPR/Cas9基因编辑技术构建MAVS基因稳定敲除的细胞株,对流感病毒的增殖特性进行初步研究。设计、构建靶向MAVS基因sgRNA表达载体,与pCAG-Cas9-EGFP表达载体共转染MDCK细胞,经过流式细胞仪分选、PCR、基因测序筛选MAVS敲除细胞系,CCK-8法检测细胞增殖速度;荧光定量PCR方法检测H9N2亚型禽流感病毒(AIV)感染后的TCID_(50)、病毒拷贝数以及IRF3、IFN-β、Mx1基因转录水平变化。结果显示,筛选出1株MAVS基因缺失44 bp的MDCK细胞(MAVS^(-/-)MDCK),其增殖速度与正常细胞相比未观察到显著差异;荧光定量PCR结果表明,TCID_(50)、病毒拷贝数差异最高可分别达到MDCK细胞的4.11倍和1.82倍;MAVS^(-/-)MDCK中IRF3、IFN-β和Mx1 m RNA表达水平显著降低,表明MAVS敲除后抑制了Ⅰ型干扰素信号通路。表明,本研究获得的MAVS^(-/-)MDCK能够促进禽流感病毒的复制,为提高疫苗生产效率和质量提供候选细胞株;该细胞株也为进一步研究MAVS参与抗病毒天然免疫应答奠定基础。展开更多
Although radiation induced bystander effect(RIBE)has been investigated for decades for secondary cancer risk assessment during cancer radiotherapy,the underlying gene regulation remains unclear,especially the roles of...Although radiation induced bystander effect(RIBE)has been investigated for decades for secondary cancer risk assessment during cancer radiotherapy,the underlying gene regulation remains unclear,especially the roles of immune factors in RIBE.Mitochondrial antiviral signaling(MAVS)protein.展开更多
Mitochondrial antiviral signaling(MAVS)protein is signaling adaptor with antiviral feature and locate in the mitochondrial out-membrane.Our study demonstrated that knockdown of MAVS increases the radioresistance and i...Mitochondrial antiviral signaling(MAVS)protein is signaling adaptor with antiviral feature and locate in the mitochondrial out-membrane.Our study demonstrated that knockdown of MAVS increases the radioresistance and irradiation(IR)induced the change of MAVS expression in cells.Knockdown of MAVS alone could decrease the mitochondrial membrane potential,while increase the mitochondrial ATP production and the expressions of apoptosis related proteins.While knockdown of MAVS followed by X-rays increased the cellular mitochondrial membrane potential,ATP production and expression of apoptosis protein,compared to the IR group only.展开更多
A novel SARS-related coronavirus(SARS-CoV-2)has recently emerged as a serious pathogen that causes high morbidity and substantial mortality.However,the mechanisms by which SARS-CoV-2 evades host immunity remain poorly...A novel SARS-related coronavirus(SARS-CoV-2)has recently emerged as a serious pathogen that causes high morbidity and substantial mortality.However,the mechanisms by which SARS-CoV-2 evades host immunity remain poorly understood.Here,we identified SARS-CoV-2 membrane glycoprotein M as a negative regulator of the innate immune response.We found that the M protein interacted with the central adaptor protein MAVS in the innate immune response pathways.This interaction impaired MAVS aggregation and its recruitment of downstream TRAF3,TBK1,and IRF3,leading to attenuation of the innate antiviral response.Our findings reveal a mechanism by which SARS-CoV-2 evades the innate immune response and suggest that the M protein of SARSCoV-2 is a potential target for the development of SARS-CoV-2 interventions.展开更多
文摘本研究利用CRISPR/Cas9基因编辑技术构建MAVS基因稳定敲除的细胞株,对流感病毒的增殖特性进行初步研究。设计、构建靶向MAVS基因sgRNA表达载体,与pCAG-Cas9-EGFP表达载体共转染MDCK细胞,经过流式细胞仪分选、PCR、基因测序筛选MAVS敲除细胞系,CCK-8法检测细胞增殖速度;荧光定量PCR方法检测H9N2亚型禽流感病毒(AIV)感染后的TCID_(50)、病毒拷贝数以及IRF3、IFN-β、Mx1基因转录水平变化。结果显示,筛选出1株MAVS基因缺失44 bp的MDCK细胞(MAVS^(-/-)MDCK),其增殖速度与正常细胞相比未观察到显著差异;荧光定量PCR结果表明,TCID_(50)、病毒拷贝数差异最高可分别达到MDCK细胞的4.11倍和1.82倍;MAVS^(-/-)MDCK中IRF3、IFN-β和Mx1 m RNA表达水平显著降低,表明MAVS敲除后抑制了Ⅰ型干扰素信号通路。表明,本研究获得的MAVS^(-/-)MDCK能够促进禽流感病毒的复制,为提高疫苗生产效率和质量提供候选细胞株;该细胞株也为进一步研究MAVS参与抗病毒天然免疫应答奠定基础。
文摘Although radiation induced bystander effect(RIBE)has been investigated for decades for secondary cancer risk assessment during cancer radiotherapy,the underlying gene regulation remains unclear,especially the roles of immune factors in RIBE.Mitochondrial antiviral signaling(MAVS)protein.
文摘Mitochondrial antiviral signaling(MAVS)protein is signaling adaptor with antiviral feature and locate in the mitochondrial out-membrane.Our study demonstrated that knockdown of MAVS increases the radioresistance and irradiation(IR)induced the change of MAVS expression in cells.Knockdown of MAVS alone could decrease the mitochondrial membrane potential,while increase the mitochondrial ATP production and the expressions of apoptosis related proteins.While knockdown of MAVS followed by X-rays increased the cellular mitochondrial membrane potential,ATP production and expression of apoptosis protein,compared to the IR group only.
基金supported by the National Key Research and Development Project of China(2020YFC0841000)the Strategic Priority Research Program(XDB29010302)+2 种基金the National Natural Science Foundation of China(31800732)the Key Research Programs of Frontier Sciences funded by the Chinese Academy of Sciencesthe Special Research Assistant Grant Program of the Chinese Academy of Sciences.
文摘A novel SARS-related coronavirus(SARS-CoV-2)has recently emerged as a serious pathogen that causes high morbidity and substantial mortality.However,the mechanisms by which SARS-CoV-2 evades host immunity remain poorly understood.Here,we identified SARS-CoV-2 membrane glycoprotein M as a negative regulator of the innate immune response.We found that the M protein interacted with the central adaptor protein MAVS in the innate immune response pathways.This interaction impaired MAVS aggregation and its recruitment of downstream TRAF3,TBK1,and IRF3,leading to attenuation of the innate antiviral response.Our findings reveal a mechanism by which SARS-CoV-2 evades the innate immune response and suggest that the M protein of SARSCoV-2 is a potential target for the development of SARS-CoV-2 interventions.
