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国家自然科学基金(30670098)

作品数:7 被引量:17H指数:3
相关作者:章晓联潘勤孙平曾洁陈芳更多>>
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发文基金:国家自然科学基金湖北省自然科学基金国家重点基础研究发展计划更多>>
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P35识别结合HCV糖蛋白的研究被引量:2
2007年
目的:研究P35(L-ficolin)作为一种凝集素补体,能否结合HCV包膜糖蛋白E1。方法:用PC DNA3-P35质粒转染细胞,建立稳定表达P35的细胞系CT26-P35,RT-PCR和Western Blot检测该细胞系,建立稳定表达HCV E1蛋白的细胞系E1-CT26,用FCM检测该细胞胞内胞膜上E1的表达。用FCM检测蛋白P35与HCV E1的作用。结果:成功建立稳定细胞系P35-CT26。E1-CT26细胞胞内和胞膜均有E1表达。FCM分析,P35与E1-CT26结合能力强于P35与CT26的结合。结论:成功建立稳定表达P35的细胞系;P35能识别并结合HCV的糖蛋白E1。
占玲俊向田潘勤刘万红章晓联
关键词:P35HCVE1巨噬细胞
Salmonella Typhi:from a Human Pathogen to a Vaccine Vector被引量:4
2008年
Salmonella (S.) typhi is an important intracellular pathogen. Among the more than 2,300 closely-related Salmonella serovars bacteria recognized, S. typhi is the only one that is pathogenic exclusively for humans, in whom it causes typhoid or enteric fever. The pathogen has been around for many years and many studies have been done in an effort to combat it. Molecular and biologic features of S. typhi and host factors and immune responses involved in Salmonella invasion have been extensively studies. Vaccines that have been developed most notably are Vi polysaccharide and Ty21a. However, as the results show, there is still a long way to go. It is also shown that multi-drug resistance has occurred to the few available antibiotics. More and more studies have shown that Salmonella can be used as a vaccine vector carrying antigens of other pathogens. This has been promising in that the immune system can be elicited in response to both the Salmonella bacteria and the antigen of the pathogen in question. This review aims to highlight some of the milestones attained in the fight against the disease from the time S. typhi was seen as a pathogen causing typhoid fever to the use of Salmonella as a vaccine vector. Cellular & Molecular Immunology.
Victor Tunje Jeza
关键词:TYPHOIDTY21A
Ficolin-A的克隆、蛋白表达和抗体的制备与鉴定
2008年
目的:克隆小鼠ficolin-A(mouse ficolin-A)基因,构建在真核及原核表达载体,并在大肠杆菌中表达和鉴定其蛋白,并制备其抗体,以进一步用于研究小鼠ficolin-A的功能。方法:用RT-PCR的方法从新生7 d的C57BL/6小鼠肝脏中运用GeneRacer kit扩增ficolin-A cDNA片段,并将该片段分别插入pVAX-1真核表达载体及pGEX-KG原核表达载体中,实现插入基因的融合,在IPTG的诱导下在大肠杆菌中表达。用GST-Sepharose 4B的柱子对表达的融合蛋白进行纯化,用SDS-PAGE和Western blot对表达产物进行鉴定。制备ficolin-A的多克隆抗体并对其效价进行测定。结果:成功地构建了pVAX-1-ficolin-A真核表达载体及pGEX-KG-ficolin-A原核表达载体,并在大肠杆菌中获得高效的表达,表达产物的相对分子质量(Mr)同预期值相一致。并且成功制备了多克隆抗体。结论:成功地构建了重组表达载体pVAX-1-ficolin-A及pGEX-KG-ficolin-A,并在E.coliBL21中表达了ficolin-A蛋白,为下一步研究小鼠ficolin-A的功能奠定了基础。
周菁孙平章晓联
关键词:基因克隆蛋白表达抗体
人DC-SIGN的原核表达载体的构建、重组蛋白的表达纯化和鉴定
2008年
目的:获得纯化的DC-SIGN蛋白,为揭示DC-SIGN参与抗原提呈的机制,探讨宿主细胞DC-SIGN蛋白和HIV、HCV、结核杆菌等病原体的相互作用机制奠定基础。方法:人DC-SIGN的cDNA克隆到pGEX-KG表达载体上,转化入E.coli中,通过IPTG诱导,过度表达GST-DC-SIGN融合蛋白,并使用Glutathione-Sepharose 4B亲和层析柱提取得到纯化的DC-SIGN蛋白,最后通过SDS-PAGE和Western Blot方法进行检测和鉴定。结果:酶切鉴定证实DC-SIGN基因已插入原核表达载体pGEX-KG。重组表达质粒pGEX-KG-DC-SIGN在大肠杆菌BL21中成功表达了DC-SIGN融合蛋白,其分子质量约为44 kU。结论:成功构建DC-SIGN原核表达重组质粒,并提取纯化出DC-SIGN原核蛋白,为下一步研究DC-SIGN的功能奠定了基础。
曾洁周从良孙平曹晓春章晓联
关键词:WESTERNBLOT
L-ficolin对A型H1N1流感病毒感染小鼠的保护作用
2009年
目的:探讨L-ficolin分子与A型H1N1流感病毒的相互作用机制。方法:将pcDNA3.1-L-ficolin真核表达质粒以及对照质粒分别肌注小鼠后感染A型H1N1流感病毒,观察感染小鼠的体重变化、肺内病毒血凝滴度,并通过肺指数以及肺组织HE染色判断感染小鼠的肺部病变情况,ELISA检测肺组织IFN-γ和IL-4的水平。结果:A型H1N1流感病毒感染后,与对照组相比,注射了pcDNA3.1-L-ficolin质粒的小鼠体重无明显下降,肺内病毒血凝滴度较低,肺组织病变较轻,并且肺内IFN-γ和IL-4的水平增高。结论:pcDNA3.1-L-ficolin对小鼠抵御A型H1N1流感病毒感染有一定的保护作用,该质粒可作为抗流感病毒的新型候选制剂。
潘勤侯炜Victor Tunje Jeza章晓联
DC-SIGN特异性适配子的筛选及鉴定被引量:3
2008年
目的:筛选高特异性、高亲合力结合DC-SIGN的单链DNA适配子,为开发抗HIV、HCV和结核杆菌感染的新型预防和治疗试剂奠定基础。方法:采用基于细胞表面展示的SELEX技术(TECS-SELEX),筛选出具有高亲合力结合DC-SIGN的单链DNA(ssDNA)适配子;运用流式细胞术(FCM)检测该适配子的亲合力;对最高亲合力适配子库进行克隆和测序;ELISA和FCM方法检测单适配子ZD8与DC-SIGN蛋白结合的剂量相关性;MTT法测定IC50观察适配子对细胞的毒性。结果:第14轮筛选的适配子库亲和力最高;DC-SIGN抗体能抑制适配子结合表达DC-SIGN蛋白的细胞;第14轮库中筛选的单适配子ZD8与DC-SIGN蛋白的结合率呈剂量依赖性;所筛选的单适配子对肝细胞几乎无毒性。结论:成功筛选出DC-SIGN蛋白的ssDNA适配子,为防治HIV、HCV和结核杆菌感染等DC-SIGN相关性疾病,提供新型预防和治疗的候选试剂和小分子药物。
陈芳曾洁孙平潘勤章晓联
关键词:DC-SIGN适配子
Specifically Binding of L-ficolin to N-glycans of HCV Envelope Glycoproteins E1 and E2 Leads to Complement Activation被引量:8
2009年
L-ficolin, one of lectin families, is a recently identified complement factor that initiates lectin pathway of complement. Little is known about its role in viral hepatitis. In the present study, we found that L-ficolin in serum from 103 patients with hepatitis C virus (HCV), were significantly higher than that in 150 healthy controls. We further found that L-ficolin expressions were significantly increased in vitro study by HCV JFH-1 infected human hepatocyte cell line Huh7.5.1. Investigation of the mechanisms of the L-ficolin action on HCV demonstrated that L-ficolin protein could recognize and bind to envelope glycoproteins E1 and E2 of HCV, activating the lectin complement pathway-mediated cytolytic activity in HCV-infected hepatocyte. This interaction between L-ficolin and HCV E1 and E2 glycoproteins was attributed to the N-glycans of E1 and E2. These findings provide new insights into the biological functions of L-ficolin in clinically important hepatic viral diseases.
Jun LiuMohammed A.M. AliYinghua ShiYinglan ZhaoFenglin LuoJin YuTian XiangJie TangDongqing LiQuan HuWenzhe HoXiaolian Zhang
关键词:L-FICOLINCOMPLEMENT
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