汉滩病毒感染诱导热休克蛋白70表达

为了解汉滩病毒感染后细胞的应激反应及ＨＳＰ７０的表达与病毒复制的关系,在汉滩病毒Ａ９株感染Ｖｅｒｏ－Ｅ６细胞后,用免疫组织化学及核酸分子原位杂交法,对细胞ＨＳＰ７０基因的表达进行了检测。结果表明,汉滩病毒感染细胞４ｈｙ后即可诱导Ｖｅｒｐ－Ｅ６细胞表达ＨＳＰ７０,表达可持续至感染后５ｄ且ＨＳＰ７０在细胞内的分布也有改变。提示汉滩病毒可直接诱导ＨＳＰ７０的高表达。     

汉滩病毒核蛋白与热休克蛋白GRP94、HSP27的相互作用

为研究汉滩病毒(Hantaan virus,HTNV)感染诱导乳鼠脑组织热休克蛋白GRP94、HSP27与病毒蛋白的相互关系,选出生2—3d的昆明乳鼠实验性感染汉滩病毒,取8d后发病乳鼠脑组织部分制石蜡切片,用免疫组化结合共聚焦显微镜检测组织中病毒抗原及GRP94、HSP27的表达,部分制匀浆液,用ELISA、免疫共沉淀方法分析病毒抗原和GRP94、HSP27的关系。结果示汉滩病毒感染诱导乳鼠脑组织神经细胞高表达GRP94且与细胞内病毒抗原有共定位关系,但未见HSP27诱导高表达;免疫共沉淀显示汉滩病毒核心抗原(HINV—NP)与GRP94、HSP27呈非共价复合物形式存在。该结果为进一步探讨HSPs在病毒感染复制中的作用以及抗病毒感染方面提供了有意义的实验资料。     

汉滩病毒核蛋白与热休克蛋白GRP94、HSP27的相互作用

为研究汉滩病毒(Hantaan virus, HTNV)感染诱导乳鼠脑组织热休克蛋白GRP94、HSP27与病毒蛋白的相互关系,选出生2～3d的昆明乳鼠实验性感染汉滩病毒,取8d后发病乳鼠脑组织部分制石蜡切片,用免疫组化结合共聚焦显微镜检测组织中病毒抗原及GRP94、HSP27的表达,部分制匀浆液,用ELISA、免疫共沉淀方法分析病毒抗原和GRP94、HSP27的关系.结果示汉滩病毒感染诱导乳鼠脑组织神经细胞高表达GRP94且与细胞内病毒抗原有共定位关系,但未见HSP27诱导高表达;免疫共沉淀显示汉滩病毒核心抗原(HINV-NP)与GRP94、HSP27呈非共价复合物形式存在.该结果为进一步探讨HSPs在病毒感染复制中的作用以及抗病毒感染方面提供了有意义的实验资料.     

人热休克蛋白70和热休克固有蛋白70的基因克隆和表达

目的:克隆人热休克蛋白70(HSP70)和热休克固有蛋白70(HSC70)基因,并在大肠杆茵中表达,获得重组蛋白.方法:用RT-PCR法从HepG2细胞中扩增HSP70及HSC70cDNA序列.测序后,将相应的cDNA插入pRSET-A表达载体,在大肠杆菌中表达,重组蛋白纯化后用SDS-PAGE及Western Blotting分析.结果:DNA序列结果显示.本研究所获得的HSP70及HSC70 cDNA序列与参考序列一致.将全长cDNA分别插入表达质粒后,转化BL21(DE3)细菌,在IPTG的诱导下,表达产物SDS-PAGE显示相应的分子量(70kDa)位置有明显的蛋白条带.Western Blotting结果证实了其为目的蛋白,经镍树脂柱纯化,获得了相应的重组多肽.结论:成功构建了原核表达重组质粒HSP70-pRSET-A和HSC70-pRSET-A,并获得了纯化的重组人HSP70和HSC70蛋白,为进一步研究这两种蛋白的结构、功能及临床应用奠定了基础.     

Hsp70与汉滩病毒S基因融合蛋白的原核表达及免疫小鼠的初步研究

本文构建了hsp70与S基因的原核融合表达载体pGEX-4T-1/hsp70-S,在大肠杆菌中表达,并通过GSTrapFF柱进行了纯化。同时制备了NP和Hsp70两种纯化蛋白。分别用这三种纯化蛋白免疫BALB/c小鼠,结果表明纯化的NP和Hsp70-NP两种蛋白均可同时诱导产生抗汉滩病毒核蛋白(NP)抗体,且后者刺激产生的抗体效价明显高于前者。淋巴细胞增殖实验表明,两组免疫小鼠的脾细胞均能够对体外抗原刺激产生增殖反应,而Hsp70-NP组免疫小鼠脾细胞对NP的增殖指数明显高于NP组免疫组。结果显示,与单独用NP免疫小鼠相比,Hsp70-NP纯化蛋白可以刺激机体产生更强的抗汉滩病毒体液免疫应答和特异性淋巴细胞增殖反应。     

Hsp70与汉滩病毒S基因融合蛋白的原核表达及免疫小鼠的初步研究

本文构建了hsp70与S基因的原核融合表达载体pGEX-4T-1/hsp70-S,在大肠杆菌中表达,并通过GSTrapFF柱进行了纯化.同时制备了NP和Hsp70两种纯化蛋白.分别用这三种纯化蛋白免疫BALB/c小鼠,结果表明纯化的NP和Hsp70-NP两种蛋白均可同时诱导产生抗汉滩病毒核蛋白(NP)抗体,且后者刺激产生的抗体效价明显高于前者.淋巴细胞增殖实验表明,两组免疫小鼠的脾细胞均能够对体外抗原刺激产生增殖反应,而Hsp70-NP组免疫小鼠脾细胞对NP的增殖指数明显高于NP组免疫组.结果显示,与单独用NP免疫小鼠相比,Hsp70-NP纯化蛋白可以刺激机体产生更强的抗汉滩病毒体液免疫应答和特异性淋巴细胞增殖反应.     

细胞外热休克蛋白70及其生物学功能

热休克蛋白（HSP）一直被描述为一种细胞内蛋白质在胞内发挥一系列生物学作用,参与细胞内蛋白质的折叠、装配、降解和修复过程。近年来,有研究发现HSP70能被主动释放到胞外,成为细胞外HSP70（extracellular HSP70,eHSP70）,但关于其功能尚不清楚。循环HSP70水平与多种疾病进程密切相关。有研究发现暴露于物理和心理刺激源作用下,HSP70可能通过脂筏或Exosome介导的分泌途径释放到细胞外,作为一种生物活性因子影响多种疾病的进程。     

热休克蛋白70在RNA病毒感染中的作用机制研究进展

本文综述了近年来热休克蛋白70(Heat shock protein 70,Hsp70)各亚型在RNA病毒感染中的作用及机制研究进展,以期总结梳理可能规律并发掘潜在抗RNA病毒途径。通过Scifinder, PubMed及中国知网等数据库检索高相关度文献,对Hsp70在RNA病毒感染的作用及机制研究进行分析比较归纳及讨论。Hsp70在RNA病毒感染中的作用机制呈现两重性:作为促感染因子辅助病毒感染,或作为免疫因子协助宿主抵抗病毒感染。Hsp70是对抗致病RNA病毒的切入点之一,在RNA病毒感染预防治疗上具有发展潜力。     

汉坦病毒感染诱导乳鼠脑神经细胞表达热休克蛋白70

生后2－3天的昆明乳鼠,每只腹腔接种0.05mL100个半数致死量的陈株汉坦病毒,于接种后不同时间点处死动物,取其脑组织常规固定,石蜡包埋制备5μm连续组织片,用免疫组化法检测组织中的病毒抗原及热休克蛋白70的表达,用共聚焦显微镜观察二者之间的关系。结果发现,感染了病毒的组织能够稳定地检测到热休克蛋白70的表达,而病毒阴性的组织则检测不到热休克蛋白70的表达,且二者有共定位关系,其分布与组织病变一致。这与在病毒感染的VeroE6细胸及EHF病人尸检组织中得到的结果一致,说明病毒感染可诱导热休克蛋白70的表达,后者可能具有保护组织避免或减轻损伤的作用。     

汉坦病毒感染诱导乳鼠脑神经细胞表达热休克蛋白70

生后2～3天的昆明乳鼠,每只腹腔接种0.05mL100个半数致死量的陈株汉坦病毒,于接种后不同时间点处死动物,取其脑组织常规固定,石蜡包埋制备5μm连续组织切片,用免疫组化法检测组织中的病毒抗原及热休克蛋白70的表达,用共聚焦显微镜观察二者之间的关系。结果发现,感染了病毒的组织能够稳定地检测到热休克蛋白70的表达,而病毒阴性的组织则检测不到热休克蛋白70的表达,且二者有共定位关系,其分布与组织病变一致。这与在病毒感染的VeroE6细胞及EHF病人尸检组织中得到的结果一致,说明病毒感染可诱导热休克蛋白70的表达,后者可能具有保护组织避免或减轻损伤的作用。     

流行性出血热尸检组织中热休克蛋白70mRNA的定位及分布

应用核酸原位分子杂交技术研究了国内不同地区３０例流行性出血热患者尸检组织中病毒ＲＮＡ及ＨＳＰ７０ｍＲＮＡ细胞内定位,同时观察了汉坦病毒感染的ＶｅｒｏＥ６细胞中ＨＳＰ７０的表达情况。结果表明,热休克蛋白７０ｍＲＮＡ在多数组织中均可检测到,分布与病毒ＲＮＡ一致,并且与组织的病理损害有关;体外实验的结果也表明在出血热病毒感染的细胞中有ＨＳＰ７０的高表达。提示热休克蛋白与汉坦病毒的致病以及流行性出血热的发病机理有关。     

Vero Cell Proteomic Changes Induced by Zika Virus Infection

The re‐emergence and the recent spread of the Zika virus (ZIKV) has raised significant global concerns due to lack of information in patient diagnosis and management. Thus, in addition to gaining more basic information about ZIKV biology, appropriate interventions and management strategies are being sought to control ZIKV‐associated diseases and its spread. This study's objective is to identify host cell proteins that are significantly dysregulated during ZIKV infection. SOMAScan, a novel aptamer‐based assay, is used to simultaneously screen >1300 host proteins to detect ZIKV‐induced host protein dysregulation at multiple time points during infection. A total of 125 Vero cell host proteins, including cytokines such as CXCL11 and CCL5, interferon stimulated gene 15, and translation initiation factors EIF5A and EIF4G2, are significantly dysregulated after ZIKV infection. Bioinformatic analyses of 77 host proteins, that are significantly dysregulated ≥1.25‐fold, identify several activated biological processes, including the JAK/STAT, Tec kinase, and complement cascade pathways.     

Curcumin Increases HSP70 Expression in Primary Rat Cortical Neuronal Apoptosis Induced by gp120 V3 Loop Peptide

Neurochemical Research - Neuronal cell dysfunction and apoptosis are the main causes of the invasion of the central nervous system by human immunodeficiency virus type 1 (HIV-1), although the...     

Expression of exercise-induced HSP70 in long-distance runner''s leukocytes

This study was designed to investigate the expression of heat shock protein 70 (HSP70), after acute moderate intensity exercise, in human peripheral blood leukocytes of trained runners and untrained controls. Ten male long-distance trained runners (TR) and untrained sedentary control subjects (SED) ran for 1 h at 70% of heart rate reserve (HRR). Basal HSP70 expression in TR was usually lower than that in SED, but basal HSP70 gene expression in TR was usually higher than that in SED. Although expression rates of exercise-induced HSP70 in both groups were similar, levels of HSP70 in SED were significantly higher than in TR. Significant increases in leukocytes, neutrophils, and lymphocytes after exercise were observed in both groups, but there were some differences between groups. We conclude that 1 h treadmill running at 70% HRR intensity is a sufficient stimulus to leukocytosis, neutrocytosis, lymphocytosis, and HSP70 proteins and gene expression in leukocytes. Adaptation to training was observed in TR.     

热休克蛋白HSP70和gp96在抗病毒感染中的作用

热休克蛋白(HSP)是一组在进化上高度保守、具有重要生理功能的蛋白质家族,是生物在应激条件下产生的一种非特异性防御产物,在调节免疫应答和抗病毒反应中起重要作用。现简要介绍HSP70、gp96(HSP96,GRP94)这两种HSP与病毒感染的关系及在抗病毒感染中的作用。     

Two Apoplastic alpha-Amylases Are Induced in Tobacco by Virus Infection

α-Amylase activity (EC 3.2. 1.1) is greatly increased in leaves of tobacco (Nicotiana tabacum L. cv Samsun NN) infected with tobacco mosaic virus (TMV). The kinetics of enzyme induction during the hypersensitive reaction resemble those of other hydrolases known to be pathogenesis-related proteins of tobacco. Two α-amylases were purified from TMV-infected leaves and shown to have features in common with well-characterized pathogenesis-related proteins: they are acidic monomers that can be separated upon electrophoresis on basic native gels, and they are found in the apoplastic compartment of the cell. This extra-cellular localization was demonstrated by comparing the α-amylase partition between the intercellular wash fluid and the cell extract with that of proteins of known cellular compartmentalization. These data indicate an active secretion of both α-amylases produced in tobacco upon TMV infection.     

双歧杆菌肽聚糖对汉坦病毒NP免疫效果的影响

探讨双歧杆菌肽聚糖作为佐剂对汉坦病毒核蛋白(HTNV-NP)免疫效果的影响。提取并制备双歧杆菌肽聚糖(PG),与HTNV-NP混合,免疫接种BALB/c小鼠,检测抗体水平变化,检测IL-2、IFNγ,淋巴细胞增殖实验检测免疫应答效果。同时观察PG的安全性。注射HTNV-NP组产生平均抗体滴度(GMT值)为74.21±17.38,IL-2和IFNγ的产生水平分别为(9.32±1.21)U/L和(97.78±6.54)U/L,淋巴细胞增殖反应刺激指数(SI)为1.7;注射HTNV-NP PG组GMT值为1276.23±94.67,IL-2和IFNγ的产生水平分别为(17.67±3.31)U/L和(154.56±10.72)U/L,淋巴细胞增殖反应SI值为3.1;而注射PBS组不产生抗体,IL-2和IFNγ的产生水平分别为(1.17±0.21)U/L和(21.90±5.12)U/L,淋巴细胞增殖反应SI值为0.2。结果显示PG可明显增强HTNV-NP的免疫效果,且未出现不良反应,是良好的疫苗佐剂。     

插入CpG序列的汉坦病毒S基因真核表达载体的构建及表达

To improve the effect of the gene immunization against Hantaan virus, we constructed the eukaryotic expression vector pTARGET-hans(ISS) containing Hantaan Virus S gene coding region and CpG motif by cloning S gene segment with CpG motif into eukaryotic expression vector pTARGET^TM.After conformed by enzyme analysis, the recombinant expression vector pTARGET-hans(ISS) was transferred into Vero-E6 cells by electroporation and the transient expression of Hantaan virus nucleocapsid protein was detected by indirect immunofluorescence assay(IFA). In some transferred Vero-E6, the green fluorescence was showed, thus we can conclude that the eukaryotic expression vector pTARGET-hans(ISS) was successfully constructed and expressed in vitro,which will lay a foundation for further animal vaccination.