靶向大鼠AT1-R基因的短发夹RNA重组腺病毒载体的构建及鉴定

目的利用AdMax腺病毒载体系统构建大鼠AT1-shRNA腺病毒载体并在293细胞中扩增制备重组病毒。方法自先期构建的pGenesil-1-AT1-shRNA真核表达载体中用RT-PCR法扩增出AT1-shRNA片段，将其克隆人PUC18质粒中。酶切构建好的pUC18-AT1-shRNA载体并克隆进入穿梭质粒pDC316中，将构建好的穿梭质粒pDC316AT1-shRNA载体和骨架病毒pBHGlox△1，3Cre共转染293细胞，包装成重组的病毒颗粒，荧光显微镜观察绿色荧光表达。结果经限制性内切酶、PCR检测和GFP表达证实成功地构建了携带AT1-shRNA的重组腺病毒载体并制备出高滴度重组病毒。结论成功地构建了携带AT1-shRNA片段的重组腺病毒载体，为进一步抗血压研究奠定了基础。     

人低氧诱导因子-1α重组腺病毒的构建和鉴定

目的 利用AdMax腺病毒载体系统构建人重组低氧诱导因子-1α(rhHIF-1α)基因腺病毒并在293细胞中扩增制备重组病毒. 方法 自先期构建的pcDNA4-rhHIF-1α真核表达载体中用RT-PCR法扩增出rhHIF-1α基因片段,将其克隆入线性化的pEGFP1-C1质粒中,用PCR法扩增EGFP-rhHIF-1α基因片段,将其克隆入PUC18质粒中.酶切构建好的pUC18-rhHIF-1α载体并克隆进入穿梭质粒PDC316中,将构建好的穿梭质粒PDC316-rhHIF-1α载体和骨架病毒pBHGlox△1,3Cre共转染293细胞,包装成重组的病毒颗粒.重组的病毒转染SG-7901细胞,荧光显微镜观察绿色荧光表达. 结果 经限制性内切酶检测和GFP表达证实成功地构建了携带重组人HIF-1α基因的重组腺病毒载体并制备出高滴度重组病毒. 结论 成功地构建了携带rhHIF-1α基因片段的重组腺病毒载体.     

HGF基因重组腺病毒载体构建及其转染对大鼠骨髓间充质干细胞增殖和迁移的影响

目的构建携带大鼠肝细胞生长因子(HGF)基因的重组腺病毒载体,并转染大鼠骨髓间充质干细胞(BMSCs),检测其在BMSCs的表达、以及对BMSCs增殖和迁移的影响。方法利用全基因合成方法得到目的基因HGF序列,将HGF基因片段与穿梭质粒pDC316-mCMV-增强绿色荧光蛋白(EGFP)连接,构建含有目的基因的pDC316-mCMV-EGFP-HGF重组质粒,经过病毒包装及扩增,获得带有荧光报告基团EGFP与HGF基因的重组腺病毒载体pDC316-mCMV-EGFP-HGF。将pDC316mCMV-EGFP-HGF重组腺病毒载体转染BMSCs细胞,通过ELISA检测HGF表达水平,CCK-8法检测BMSCs增殖能力,Transwell法检测BMSCs迁移。结果构建了表达HGF基因和荧光报告基因EGFP的重组腺病毒载体pDC316-mCMV-EGFP-HGF,转染BMSCs后,BMSCs细胞HGF表达水平、增殖及迁移均明显高于非转染组(P<0.05)。结论成功构建pDC316-mCMV-EGFP-HGF重组腺病毒载体,可以介导HGF在BMSCs中稳定表达,并提高BMSCs增殖及迁移能力。     

应用AdEasy腺病毒载体系统构建人GST-π基因的重组腺病毒

目的：利用AdEasy腺病毒载体系统构建人谷胱甘肽转移酶-π（GST-π）基因重组腺病毒并在HEK293细胞中扩增制备重组病毒。方法：从质粒中通过PCR的方法扩增出目的基因GST-π并带有适宜的酶切位点,双酶切后连pAdtrackCMV中构建成腺病毒穿梭质粒pAdtrack-GST-π,经酶切线性化后,采用电穿孔转化到含腺病毒骨架质粒AdEasy1的BJ5183大肠杆菌电感受态细菌中,挑选同源重组质粒AdEasy-GST-π,酶切线性化重组质粒并转染HEK293细胞包装成重组病毒颗粒,荧光显微镜观察绿色荧光表达。重组病毒上清乒乓交互感染HEK293细胞,荧光显微镜观察绿色荧光表达。结果：经限制性内切酶检测和GFP表达证实成功地构建了携带GST-π基因的重组腺病毒载体并制备出高滴度重组病毒。结论：成功地构建了携带GST-π基因的重组腺病毒载体,为利用GST-π基因转染造血干细胞的基因治疗奠定了基础。     

人FRNK重组腺病毒的构建

目的:应用AdEasy复制缺陷型腺病毒载体系统构建人FRNK基因重组腺病毒,并在HEK293细胞中扩增制备重组病毒。方法:把人FRNK基因克隆入腺病毒穿梭载体pAdTrack-CMV中,构建腺病毒质粒pAdTrack-CMV-hFRNK,经PmeⅠ内切酶酶切成线性化后,采用电穿孔转化将其转化到含有腺病毒骨架载体pAdEasy-1的感受态大肠杆菌BJ5183中,通过卡那霉素筛选获得阳性腺病毒重组质粒。再将获得的腺病毒重组质粒转染到HEK293细胞进行包装,获得人FRNK重组腺病毒pAdhFRNK。荧光显微镜下观察绿色荧光蛋白的表达。结果:经酶切和绿色荧光蛋白表达证明了hFRNK基因的重组腺病毒载体pAdhFRNK构建成功,并制备出高滴度的重组病毒。结论:成功构建携带人FRNK基因的重组腺病毒pAdhFRNK,为研究FRNK的基因治疗奠定了基础。     

人白细胞介素21基因重组复制缺陷型腺病毒的制备与鉴定

目的 制备表达绿色荧光蛋白的含人白细胞介素21(IL-21)基因的重组复制缺陷型腺病毒,为IL-21基因治疗肿瘤的研究奠定基础.方法 从人外周血淋巴细胞提取总RNA,经RT-PCR扩增IL-21基因片段,PCR产物和pDC316-mCMV-EGFP载体分别经限制性内切酶Notl与HindⅢ双酶切,然后将酶切产物连接、转化,构建pDC316-IL21-EGFP重组质粒.重组质粒经酶切和测序鉴定后,与腺病毒骨架质粒pBHGlox_E1,3CreF35共转染293细胞,包装产生Ad5F35-IL21-EGFP重组腺病毒,并测定病毒滴度.观察Ad5F35-IL21-EGFP腺病毒转染后食管癌细胞EC-9706的生长曲线和细胞周期的变化.结果 pDC316-IL21-EGFP重组质粒经酶切和测序证实,IL-21基因片段正确插入pDC316-mCMV-EGFP栽体中且与GenBank中,IL-21基因序列一致.AdSF35-IL21-EGFP重组腺病毒栽体在293细胞中包装成功.获得成熟的病毒颗粒,经鉴定有IL-21基因和绿色荧光蛋白的表达.测得Ad5F35-IL-21-EGFP病毒颗粒滴度为9×1011VP/ml,感染性滴度为5×1010IU/ml.AdSF35-IL21-EGFP转染后,EC-9706细胞的生长缓慢(P＜0.05),G1期细胞增加,而G2期和S期细胞减少.结论 成功制备了表达绿色荧光蛋白的人IL-21基因的重组腺病毒,且病毒滴度较高.腺病毒介导的外源性IL-21基因可有效转染EC-9706细胞,并对其生长有抑制作用.     

HBV-TR重组腺病毒载体的构建

目的: 构建乙肝病毒靶向核糖核酸酶(HBV targeted ribonuclease, TR)基因的重组腺病毒载体. 方法: 将HBV-TR基因及其对照组基因分别克隆入质粒载体pDC316得到pDC316/TR等穿梭质粒,然后将所得的穿梭质粒和辅助质粒pBHGlox(delta)E1, 3Cre以磷酸钙法共转染HEK293细胞得到重组腺病毒Ad/TR及对照组重组病毒,并以空斑形成实验(Plaque Assay)测定病毒滴度. 结果: 成功构建了HBV-TR重组腺病毒载体Ad/TR及其对照组病毒并获得了高滴度的病毒颗粒. 结论: HBV-TR重组腺病毒载体成功构建.     

人BMP-7基因重组腺病毒的构建与鉴定

目的 构建含有人骨形态发生蛋白-7(bone morphogenetic protein-7,BMP-7)基因的重组腺病毒载体,并对其相关指标进行鉴定,观察其对肾小管上皮细胞株(HKC)细胞的转染情况.方法 用基因工程技术将人BMP-7基因cDNA亚克隆至穿梭质粒pDC316上,利用脂质体介导的方法将AdMax腺病毒包装系统的骨架质粒pBHGlox_E1,3Cre和穿梭质粒pDC316-BMP-7转染入HEK293细胞,进行同源重组,得到腺病毒重组质粒Ad5-BMP-7,并在其中包装扩增病毒.采用PCR方法对重组腺病毒进行鉴定,利用穿梭质粒中所带绿色荧光蛋白GFP报告基因,进行病毒滴度的测定和对HKC细胞感染效率的检测.结果 酶切鉴定及PCR结果证明BMP-7基因重组腺病毒载体构建成功,病毒滴度达1.25 × 1010PFU/ml,对HKC有较强感染能力.结论 应用细胞内同源重组方法成功构建了含人BMP-7基因的重组腺病毒载体.     

携带人脂联素基因重组腺病毒的构建及表达

目的构建携带人脂联素基因的重组腺病毒载体,为进一步研究脂联素的功能提供实验基础。方法以带有人脂联素基因的质粒pINCY—APM1为模板,聚合酶链反应扩增人脂联素基因APM1,并将其定向克隆于真核表达载体pDC315-EGFP,与辅助质粒pBHGlox△E1,3Cre共转染HEK293细胞,经位点特异重组包装得到重组腺病毒Ad—APM1。通过Real—timePCR和Westernblot分别检测重组腺病毒Ad—APM1感染HEK293细胞后的表达。结果重组腺病毒Ad-APM1包装成功,病毒滴度〉6．3×10^12pfu／mL。Real—timePCR和Westernblot检测证实APM1在HEK293中表达。结论应用细胞内同源重组方法成功构建了携带人脂联素基因的重组腺病毒。     

携带神经导向因子netrin-1基因的重组腺病毒构建

目的:制备并构建神经导向因子netrin-1(NT-1)和EGFP双基因共表达的重组腺病毒载体,为后续的基因转染做准备.方法:采用基因克隆技术克隆目的基因NT-1,并将目的基因克隆入含有报告基因EGFP的穿梭载体pDC316质粒;构建的质粒pDC316-netrin经酶切及测序鉴定正确后.通过脂质体lipofeetamine2000的介导与腺病毒包装质粒pBHGlox_E1.3Cre共转染至人胚肾细胞HEK293,经同源重组后得到携带鼠NT-1的重组腺病毒Ad5-netrin-CMV-EGFP.应用PCR鉴定重组腺病毒,空斑传代纯化病毒并反复冻融扩增病毒.以50%组织培养感染剂量法(TCID50)测定病毒滴度.结果:PCR鉴定证实重组腺病毒含有鼠NT-1基因,病毒滴度为5.2×109pfu/ml,EGFP活性检测腺病毒感染阳性细胞率在40%以上.结论:成功制备Ad5-netrin-CMV-EGFP腺病毒,为以后基因治疗研究打下基础.     

基质金属蛋白酶组织抑制剂1基因重组腺病毒载体的构建

目的 为探讨基因治疗逆转或延缓椎间盘退变的可行性,构建及制备人基质金属蛋白酶组织抑制剂1 (tissue inhibitor of metalloproteinase 1,TIMP1) cDNA重组腺病毒载体.方法 以含TIMP1 cDNA序列的质粒为模板,通过PCR方法扩增TIMP1cDNA片段,将TIMP1 cDNA全长定向克隆到Ad5MaxTM腺病毒系统的穿梭质粒pDC316上,构建pDC316-TIMP1穿梭质粒;使用Ad5MaxTM腺病毒包装系统,脂质体介导的穿梭质粒及骨架质粒pBHGlox-E1,3Cre共转染HEK293细胞,同源重组构建含TIMP1 cDNA的重组腺病毒Ad5-TIMP1,通过PCR方法鉴定重组腺病毒Ad5-TIM P1的正确性.通过阴离子柱层析方法纯化重组腺病毒Ad5-TIMP1并测定重组腺病毒感染滴度.结果 经PCR及酶切方法证实pDC316-TIMP1穿梭质粒中存在630 bp大小左右的插入片段,与目的基因TIMP1的cDNA大小一致;经PCR鉴定证实TIMP1 cDNA重组腺病毒载体Ad5-TIMP1构建成功,病毒感染性滴度为1×1010 IU/mL.结论 成功构建TIMP1 cDNA重组腺病毒载体,为应用基因治疗方法逆转或延缓椎间盘退变的研究奠定实验基础.     

以AdMax载体系统构建和制备肾癌相关抗原G250基因重组腺病毒表达载体

目的 构建肾癌相关抗原G250重组腺病毒载体,以期用于基因转染树突状细胞(DC)治疗肾癌的实验研究.方法 利用AdMax包装系统,首先构建穿梭质粒pDC316-G250,然后将所得的穿梭质粒和辅助质粒pBHGlox(delta)E1,3Cre以CaCL2法质粒共转染293细胞得到重组腺病毒Ad/G250,CsCl梯度离心纯化病毒,TCID50法测定病毒滴度.Ad/G250转染DC细胞,RT-PCR及流式细胞仪检测G250的表达.结果 采用双质粒共转染293细胞,Cre/loxP位点同源重组方法构建了E1和E3缺失的含外源基因的Ad/G250载体.经过PCR、RT-PCR和流式细胞仪证实腺病毒载体构建成功.病毒经过CsCl梯度离心纯化后,Ad/G250滴度达到5.6×109 U/ml.RT-PCR及流式细胞仪显示Ad/G250在DC中特异性表达.结论 成功构建了G250重组腺病毒载体.     

Construction and identification of recombinant adenovirus-mediated gene transfer system for rat vascular endothelial growth factor

Objective To construct the recombinant adenovirus vector carrying rat vascular endothelial growth factor(VEGF), as preparation for genetic transfection that follows. Methods Rat VEGF was obtained by using RT-PCR amplification and then cloned into the shutter plasmid pDC316. Subsequently, this newly constructed plasmid pDC316-VEGF, after identification by nuclease digestion analysis and sequencing analysis, was transfected into human embryonic kidney cells HEK293 by Lipofectamine 2000 mediation, together with adenovirus-packaging plasmid pBHGE3. Based on the homologous recombination of the two plasmids within HEK293 cells, the recombinant adenovirus vector carrying VEGF and VDC316-VEGF was created. VDC316-VEGF was subsequently identified using PCR, purified using repeated plaque passages, proliferated using freezing and melting within HEK293 cells, and titrated using 50% Tissue Culture Infective Dose(TCID50) assay. ResultsThe newly constructed recombinant adenovirus was confirmed to carry rat VEGF based on PCR results, and its titration value determined based on TCID50 assay was 3×109 pfu/ml. ConclusionThe recombinant adenovirus carrying rat VEGF was successfully constructed. The newly constructed adenovirus can produce a sufficiently high titration value within HEK293 cells, providing a reliable tool for genetic transfection in further gene therapy researches.     

Construction of hepatocyte growth factor gene recombinant adenovirus vector and its expression in rat bone marrow mesenchymal stem cells

ObjectiveTo construct the adenoviral expression vector system containing human hepatocyte growth factor (hHGF) cDNA, and to further study the transduction efficiency and the expression of HGF in mesenchymal stem cells (MSCs). MethodsThe HGF cDNA was amplificated from the expression plasmid pCMV-HGF, and was subcloned into the adenovirus shuttle plasmid pDC316-IRES-EGFP vector containing a green fluorescence protein (GFP) reporter gene. Virus Ad-HGF was produced by homologous recombination in HEK293 package cells. Bone marrow derived MSCs were harvested and cultured, and then were transduced with Ad-HGF. The efficiency of Ad-HGF transduction was assessed by FACS analysis using GFP gene expression. And HGF/MSCs were generated. The HGF concentrations in supernatants of HGF/MSCs were determined by ELISA using anti-human HGF monoclonal antibody. Results The recombinant, named pDC316-HGF-IRES-eGFP, was digested with restriction enzyme, and the DNA sequencing of HGF was identical to the report in Genebank and did not reveal any mutation. GFP expression could be observed on the second day after packing of the linearized pAd-HGF in HEK293 cells and 7.15×1010pfu/ml titer of Ad-HGF was obtained. Forty-eight hours after transduction, 96.89% of HGF/MSCs were GFP positive. Peak concentration levels of hHGF(103ng/mL) in the cultured supernatants were detected on day 2 post-transduction, and the adenovirus-mediated expression of HGF by MSCs was maintained for at least 2 weeks in vivo. ConclusionOur data demonstrated that the adenovirus expression'vector system pDC316-HGF-IRES-EGFP has been constructed successfully, and their effective expressions also have been obtained in MSCs. This will provide material basis for the next study on liver regeneration after small-for-size liver transplantation.     

携带凋亡素、内皮抑素双基因腺病毒载体的构建

目的构建携带有凋亡素(Apoptin、VP3)、内皮抑素(Endostatin)双基因的重组腺病毒载体,为其在肿瘤治疗的应用研究打下基础。方法将VP3基因和Endostatin基因克隆入腺病毒穿梭质粒pDC316中,将该穿梭质粒与腺病毒骨架质粒pBHGloxE1,3Cre共转染HEK293细胞,包装出重组腺病毒颗粒Ad-vp3-IRES-sEndo-his。其后挑选病毒空斑获取克隆进行小剂量扩增并提取病毒DNA进行PCR、RT-PCR检查以筛选和鉴定毒种,之后大剂量扩增所选得的病毒克隆并进行纯化、测定病毒的滴度。结果所得腺病毒经PCR、RT-PCR检测表明重组腺病毒Ad-vp3-IRES-sEndo-his包装成功。测定病毒50%组织培养感染剂量(TCID50)为5.7×109/ml,病毒颗粒滴度(VP)为1.9×1011/ml。结论成功构建携带凋亡素、内皮抑素双基因腺病毒载体并对其进行了大剂量扩增及提纯,达到了细胞及动物实验使用的标准。     

Construction of a bicistronic recombinant adenoviral vector for human interleukin-10 and enhanced green fluorescent protein expression in bone marrow mesenchymal stem cells

Background  Human interleukin-10 (hIL-10) is a cytokine synthesis inhibitory factor, which is involved in various immune responses. The purpose of this study was to construct an adenoviral vector carrying the hIL-10 gene for expression of biologically active hIL-10 in rat bone marrow mesenchymal stem cells (rMSCs).

Methods  A pSNAV2.0-hIL10 plasmid was used as a template to obtain a hIL-10 cDNA fragment that was subcloned by restriction enzyme digestion and ligation into a pDC316-IRES-EGFP-lacZ alpha plasmid carrying an enhanced green fluorescent protein (EGFP) marker gene. The pDC316-hIL-10-IRES-EGFP plasmid was linearized by PmeI digestion and used to transfect HEK293 packaging cells using the adenovirus packaging system AdMax. Virus particles were amplified by repeatedly infecting HEK293 cells with the seed virus and then purified by ion exchange. After the number of virus particles and titer was determined, rMSCs were infected with the adenoviral vector. The infection rate was determined by fluorescence microscopy and flow cytometry, and hIL-10 protein expression in rMSCs was measured by Western blotting.

Results  The virus particle concentration, OD260/280 value and virus titer of the amplified and purified recombinant adenovirus were 3.2×10¹¹ VP/ml, approximately 2.0, and 1.1×10¹⁰ TCID50/ml, respectively. Bright green fluorescence was observed by fluorescence microscopy and flow cytometry in the recombinant adenovirus-infected rMSCs. GFP expression was considered the multiplicity of infection (MOI) and was time-dependent. The infection rate was 92.9% at 100 MOI.

Conclusions  A bicistronic recombinant adenoviral vector for hIL-10 and EGFP gene expression were successfully constructed. The infection rate of rMSCs by the adenovirus was high (92.9% at 100 MOI) and the target gene hIL-10 was highly expressed in cells. The present study provides an experimental basis for further research of immunosuppressive therapy using hIL-10. The expression level of hIL-10 protein as detected by Western blotting was also MOI- and time-dependent.

     

Betatrophin重组腺病毒过表达载体的构建

［摘要］目的: 应用基因同源重组技术,构建及鉴定携带小鼠betatrophin基因Gm6484(NM_001080940)的复制缺陷型重组腺病毒载体,为进一步研究betatrophin的功能奠定基础。方法: 根据基因库中登录的小鼠betatrophin基因Gm6484(NM_001080940)序列,经化学合成得到含BamHⅠ/ AgeⅠ酶切位点的小鼠betatrophin基因全长cDNA质粒,将其酶切后插入到带有增强型绿色荧光蛋白（enhanced green fluorescent protein,EGFP）基因的GV314载体CMV MCS 3FLAG SV40 EGFP中,得到重组病毒穿梭质粒pGV314 betatrophin;经BamHⅠ/ AgeⅠ双酶切后,与线性化的pDC315病毒基因组质粒体外同源重组,构建含有目的基因的腺病毒载体Ad betatrophin,酶切线性化重组腺病毒质粒后转染HEK293T细胞包装成重组病毒颗粒,经在HEK293T细胞反复扩增数代后,利用聚合酶链式反应（PCR）、蛋白质印迹法及测序鉴定重组的腺病毒。结果： 阳性克隆质粒Ad betatrophin在HEK293T细胞中成功包装出重组病毒,经PCR、蛋白质印迹及测序检测表明重组腺病毒包装成功。结论： 成功构建了携带小鼠betatrophin基因的复制缺陷型重组腺病毒过表达载体。     

以AdMax载体系统构建携带HCV NS5B基因的重组腺病毒表达载体

目的构建表达丙型肝炎病毒(HCV)非结构基因NS5B的重组腺病毒表达载体,并对其相关指标进行鉴定,为进一步研究防止丙型肝炎感染的基因免疫和基因治疗奠定实验基础。方法应用基因工程技术将HCVNS5B基因定向克隆至穿梭质粒pDC316上,利用脂质体介导的方法将AdMax腺病毒包装系统的骨架质粒pBHGloxΔE1、3Cre和穿梭质粒pDC316-NS5B共转染293细胞,进行同源重组,产生重组腺病毒pAd-NS5B并进行鉴定、反复感染293细胞进行扩增,扩增后测定重组病毒滴度。结果重组病毒颗粒pAd-NS5B经双引物PCR、凝胶电泳证明插入片段与HCV非结构基因NS5B片段大小相符;经测序证明其插入序列与设计HCV NS5B基因序列完全一致,扩增后重组病毒滴度达到2.3×1013IU/L。结论成功构建了表达HCV NS5B基因的重组腺病毒载体。     

密码子优化的HIV-1型gp120基因重组腺病毒载体疫苗的构建与鉴定

目的 构建密码子优化型gp120基因重组腺病毒载体（rAden-mgp120）,为研发新型HIV预防性疫苗奠定基础.方法 首先利用PCR的方法扩增mgp120基因,将目的基因克隆入载体pENTR/D-TOPO以获得重组穿梭载体克隆pENTR/D-TOPO-mgp120.经过穿梭载体克隆与表达载体（pAd-CMV/VS-DEST）间的重组反应获得表达克隆质粒pAden-mgp120,表达克隆线性化后转染HEK293A包装细胞,得到复制缺陷型重组腺病毒rAden-mgp120.结果 经PCR和测序鉴定,重组载体rAden-mgp120构建正确,转染HEK293A细胞并扩增后获得的病毒滴度为6.8x1011pfu/ml,该重组腺病毒载体能正确表达mgp120蛋白.结论 成功构建了重组腺病毒rAden-mgp120为HIV-1预防奠定了基础.