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 a Targeting Adenoviral Vector Carrying Survivin Promoter for Expressing EGFP Gene in Laryngeal Carcinoma Cell Line Hep-2

In gene therapy for any type of malignancy, tumor specificity is of utmost importance. Here we constructed the adenoviral vector bringing EGFP gene under the control of survivin promoter for evaluation of the possibility of target gene therapy in laryngeal carcinoma. First, Survivin promoter （SP） was amplified by PCR in the replace of CMV promoter in the plasmid pShuttle. Enhanced green fluorescent protein gene （EGFP） digested from the plasmid pEGFP-CI was cloned into plasmid pShuttle. Further two genes were cloned to Adeno-X Viral DNA. The recombinant adenoviral plasmid was transferred to HEK293 cells by lipofectamine. After titrating the virus, the laryngeal carcinoma cells （Hep-2） were transfected by the adenovirus and the expression of EGFP gene was detected. The recombinant Ad-SP-EGFP was correctly constructed and confirmed by restriction endonuclease analysis and DNA sequencing. After Hep-2 cells were transfected by the virus, RT-PCR showed that survivin mRNA was transcribed from the tumor cells. Western blot and fluorescent microscope showed EGFP protein was expressed in transgene Hep-2 cells. Present results suggest that survivin promoter may provide a new promising tool for target gene therapy of human malignancies.     

Construction of Adeno-associated Virus System for Human Bone Morphogenetic Protein 7 Gene

To construct the recombinant adeno-associated virus （rAAV） vector with human bone morphogenetic protein 7 （BMP7） and observe the BMP7 mRNA expression in vitro, BMP7 CDS sequence was cloned into expression plasmid pAAV-MCS of AAV Helper Free System. The recombinant plasmid was identified with enzyme digestion and sequencing. The recombinant plasmid, pAAV-RC, pHelper were co-transfected into AAV-293 cells according to the calcium phosphate-based protocol. The viral stock was collected by 4 rounds of freeze/thaw. After purified and concentrated, the recombinant virus titer was determined by dot-blot assay. HEK293 cells were transfected with the recombinant virus at different MOI, and the expression of BMP7 mRNA was detected by RT-PCR. The results showed rAAV-BMP7 was constructed and packaged successfully. The physical particle titer was 2.5×10^11 vector genomes/mL. There was different expression level of BMP7 mRNA after transfecton. These data suggested that recombinant AAV mediated a stable expression of hBMP7 mRNA in 293 cells. The AAV production method may pave the way of an effective strategy for the jaw bone defection around dental implants.     

Construction of Prokaryotic Expressing Vector of Antisense Nucleic Acid of lasR and Its Effect on the Virulence of Pseudomonas Aeruginosus

To construct a pUCP18/lasRantisense plasmid carrying the reversed gene and analyze its effect on the virulence of Pseudomonas aeruginosus,LasR gene was amplified from the genome of Pseudomonas aeruginosus by PCR and reversely recombined with plasmid pUCP18.The recombi-nant pUCP18/lasRantisense was verified by enzyme digestion,PCR and sequencing.The biological ef-fects of pUCP18/lasRantisense were examined by using RT-PCR,NAD method and the assay of pyo-cyanin.Our results showed that the expected full length lasR fragment(721 bp) was extended from Pseudomonas aeruginosus gene with PCR.And it is consistent with LasR gene of Pseudomonas aeruginosa in GenBank(No.NC-002516).The recombinant plasmid was successfully constructed and transferred into Pseudomonas aeruginosus.The antisense nucleic acid of LasR gene could reduce the virulence of Pseudomonas aeruginosus and might serve as a new target site for treatment purpose.     

Construtcion of Neisseria Gonorrhoeae Porin B Plasmid Recombinant and Its Expression in E. coli

A prokaryotic expression recombinant plasmid pET-PIB to express porin B (PIB) of Neisseria gonorrhoeae in E. coli DE3 was constructed in order to provide a basis of research in detection, prophylactic and therapeutic vaccine against the pathogen infection. The gene encoding PIB was amplified by PCR from Neisseria gonorrhoeae and cloned into prokaryotic expression plasmid pET-28a( ) to construct a pET-PIB recombinant, which was verified by restriction endonuclease and DNA sequencing. Protein PIB was expressed in E. coli DE3 induced with IPTG. The antigenicity of the expressed protein was evaluated by indirect ELISA. Rabbits were immunized with the protein and serum was collected after immunization. To assess the immunogenicity of the protein, the titer of serum to protein PIB was determined by ELISA. DNA sequence analysis showed that the nucleic acid sequence of PIB gene was 99.28 % of homology compared with that (NGPIB18) published in GenBank. A 41 kD fused protein was detected by SDS-PAGE and was proven to have reactivity with anti-PIB polyclonal antibody from mouse. A polyclonal antibody to PIB of 1：4000 titer determined by indirect ELISA was obtained from rabbit immunized with the purified product. Recombinant plasmid encoding PIB of Neisseria gonorrhoeae was constructed. Protein PIB with antigenicity and immunogenicity was successfully expressed.     

Construction of Recombinant Plasmid Harboring APP717 Mutation and Preliminary Study of APP Proteolysis

In order to investigate the pathogenesis of Alzheimer disease （AD） and study the enzymatic progress of amyloid precursor protein （APP）, the fluorescent eukaryotic expression plasmid of C99 was constructed containing APP717 mutation. The fragment encoding the last 99-aa of APP （which was named C99 containing APP717 mutation）, together with the fragment encoding yellow fluorescence protein （which was named YFP） were amplified by PCR. The two fragments （YFP and C99） were inserted into the vector pcDNA3.0. The recombinant plasmid pcDNA3.0-YFP-C99 was accomplished and its authenticity was confirmed by enzyme digestion and sequencing. Then SH-SY5Y cells were transiently transfected with the recombinant plasmid pcDNA3.0-YFP-C99. The expression of the fusion gene was detected by laser confocalmicroscopy. Amyloid-β （Aβ） was detected by both microscopy and immunochemistry. The authenticity of the construct was confirmed by the endonuclease digestion and DNA sequencing. The YFP fluorescence could be seen and proved the expression of fusion gene. Aβ labeled by YFP was detected by confocalmicroscopy and confirmed by immunocytochemistry. It was found that Aβ accumulated and deposited in the intracytoplasm, membrane and outside of the cell. Furthermore, Aβ accumulated mainly within the cell ahead of the deposition in the cell space and the cell shape was rough. It was suggested that Aβ could be generated within the cells. Aβ accumulated in the cell at the early stage before the deposition outside of the cells Intracellular Aβ accumulation induced the secondary damage to the cells and caused the cell shape rough. Taken together, the recombinant plasmid, pcDNA3.0-YFP-C99 could be a useful tool to further study the cleavage mechanism of APP and to explore the pathogenesis of AD.     

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.     

Construction of eukaryotic expression vector encoding ATP synthase lipid-binding protein-like protein gene of Sj and its expression in HeLa cells

Objective： To clone and construct the recombinant plasmid containing ATP synthase lipid-binding protein-like protein gene of Schistosomajaponicum,（SjAslp） and transfer it into mammalian cells to express the objective protein. Methods： By polymerase chain reaction （PCR） technique, SjAslp was amplified from the constructed recombinant plasmid pBCSK＋/SjAslp, and inserted into cloning vector pUCm-T. Then, SjAslp was subcloned into an eukaryotic expression vector pcDNA3.1（＋）. After identifying it by PCR, restrictive enzymes digestion and DNA sequencing, the recombinant plasmid was transfected into HeLa cells using electroporation, and the expression of the recombinant protein was analyzed by immunocytochemical assay. Results： The specific gene fragment of 558 bp was successfully amplified. The DNA vaccine of SjAslp was successfully constructed. Immunocytochemical assay showed that SjAslp was expressed in the cytoplasm of HeLa cells. Conclusion： SjAslp gene can be expressed in eukaryotic system, which lays the foundation for development of the SjAslp DNA vaccine against schitosomiasis.     

Construction of recombinant adeno-associated virus vector co-expressing hVEGF_(165) and hBMP_7 gene

Objective: To construct recombinant adeno-associated virus co-expressing human vascular epithelial growth factor 165(hVEGF165) and bone morphogenetic protein 7(hBMP7),measure the virus titer and verify the recombination. Methods:The AAV helper-free system was used as basis to generate recombinant AAV. The IRES sequence of plasmid pIRES was cut down and subcloned into ITR/MCS containing vector pAAV-MCS to construct recombinant plasmid pAAV-MCSa-IRES-MCSb. The hVEGF165 and hBMP7 gene was amplified by PCR and inserted into upstream MCSa and downstream MCSb respectively. Then,recombinant plasmid pAAV-hVEGF165-IRES-hBMP7,pAAV-RC and pHelper were co-transfected into AAV-293 cells to complete rAAV-hVEGF165-IRES-hBMP7 packaging. The GFP labeled rAAV-IRES-GFP was simultaneously packaged by using the parallel plasmid pAAV-IRES-hrGFP. The efficiency of AAV packaging was monitored under fluorescent microscope and recombinant viral particles were harvested from infected AAV-293 cells. The virus titer was measured by infecting AAV-HT1080 cells,and the recombinant AAV-hVEGF165-IRES-hBMP7 was verified by PCR of the exogenous interest genes. Results:Recombinant pAAV-hVEGF165-IRES-hBMP7 was verified by double digestion. GFP expression in AAV-293 could be observed under fluorescent microscope 72 h after transfection and the system provided a high packing ratio of 95%. The recombinant adeno-associated virus has a high titer of 5.5×1011vp/ml,and AAV-HT 1080 was infected at a ratio of 90%. The recombinant virus was confirmed by PCR of exogenous hBMP7 and hVEGF165 gene. Conclusion:Recombinant rAAV-hVEGF165-IRES-hBMP7 was successfully constructed with a high virus titer,which may offer foundation for in vitro and in vivo experiments of hVEGF165 and hBMP7 co-expression and provide a new method for gene therapy of bone regeneration.     

Construction and Expression of Bivalent Membrane-anchored DNA Vaccine Encoding Sj14FABP and Sj26GST Genes

In order to construct a eukaryotic co-expression plasmid containing membrane-anchored Sjc14FABP and Sjc26GST genes and identify their expression in vitro, Sj 14 and Sj26 genes were obtained by RT-PCR with total RNA of Schistosoma japonicum adult worms as the template and cloned into eukaryotic expression plasmid pVAC to construct recombinant plasmids pVAC-Sj14 and pVAC-Sj26. Then a 23 amino-acid signal peptide of human interleukin-2 (IL-2) upstream Sj14 or Sj26 gene and a membrane-anchored sequence containing 32 amino-acids of carboxyl-terminal of human plaeental alkaline phosphatase (PLAP) downstream were amplified by PCR as the template of plasmid pVAC-Sj14 or pVAC-Sj26 only to get two gene fragments including Sj14 gene and Sj26 gene. The two modified genes were altogether cloned into a eukaryotic co-expression plasmid pIRES, resulting in another new recombinant plasmid pIRES-Sj26-Sj 14. The expression of Sl14 and Sl26 genes was detected by RT-PCR and indirect immunofluorescent assays (IFA) when the plasmid pIRES-Sj26-Sj14 was transfected into eukaryotic Hela cells. Restriction enzyme analysis, PCR and sequencing results revealed that the recombinant plasmids pVAC-Sj14, pVAC-Sj26 and pIRES-Sj26-Sj 14 were successfully constructed and the expression of modified Sj 14 and Sj26 genes could be detected by RT-PCR and IFA. A bivalent membrane-anchored DNA vaccine encoding Sj14 and Sj26 genes was acquired and expressed proteins were proved to be mostly anchored in cellular membranes.     

小鼠 T-bet基因重组腺病毒载体的构建

[目的] 构建小鼠 T-bet基因重组腺病毒载体,为 T-bet基因在支气管哮喘治疗中的作用研究提供有效的 T-bet生物表达系统.[方法] 采用内切酶从质粒 T-bet/GFP-RV中切获约 1.7 kb的小鼠 T-betcDNA片段,与穿梭质粒 pShuttle连接,再通过稀有酶切位点将含 T-betcDNA的表达盒与 Adeno-X腺病毒载体骨架连接,构建重组载体 pAdeno-T-bet,测序鉴定无错配及插入移位等 DNA顺序改变,并转染 HEK293细胞,出现 CPE后取含病毒上清的细胞培养液抽提病毒 DNA行 PCR鉴定.[结果] PCR及酶切证实: T-betcDNA正确克隆到穿梭质粒 pShuttle中,带 T-betcDNA的表达盒成功重组到腺病毒载体基因组 E1A缺失区,并在 HEK293细胞中成功包装出具有感染活性的重组腺病毒 pAdeno-T-bet.[结论]本实验成功构建了小鼠 T-bet基因重组腺病毒载体,并在 HEK293细胞中成功包装出重组腺病毒.     

大鼠CnA/EGFP基因共表达的真核表达质粒的构建

目的：构建大鼠钙调磷酸酶A亚基（CnA）α基因/EGFP共表达的真核表达质粒，为研究钙调磷酸酶基因在缺血缺氧再灌注诱导的心肌细胞凋亡中的作用提供生物表达系统。 方法：RT-PCR方法扩增大鼠CnA基因(约1 590 bp)，克隆至T载体，经酶切鉴定和DNA测序证实CnA序列正确后，再用内切酶将CnA从T- CnA质粒中切出，与已插入报告基因IRES-EGFP基因片段的重组pShuttle2载体（pShuttle2-IRES-EGFP）连接,构建CnA/EGFP共表达的真核表达质粒pShuttle2- CnA -IRES-EGFP。 结果：DNA测序结果显示扩增的CnA DNA序列与相应的GenBank(NM_017041)所公布的序列完全相同；Nhe Ⅰ和Not Ⅰ双酶切重组质粒pShuttle2-CnA-IRES-EGFP,1%的琼脂糖凝胶电泳分析可见大小分别为1 590 和5 240 bp两条片段,与预期值相符。 结论：成功构建了以增强型绿色荧光蛋白（EGFP）标记的大鼠CnA基因的真核表达质粒。     

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.     

携带人分泌型内皮抑素基因重组腺病毒的制备和鉴定

目的制备包含人分泌型内皮抑素基因的重组腺病毒,为下一步探讨其在血管生成依赖性疾病的治疗研究中的应用提供基础。方法以T-Endostatin质粒为模板,通过PCR扩增回收hEndostatin,将hEndostatin连接到pShuttle2中,构建pShuttle2-hEndostatin表达质粒,将此表达质粒连接到缺陷型腺病毒载体,构建Ad-hEndo。其线性化后转染HEK293T细胞,纯化后的重组腺病毒Ad-hEndo在HEK293T细胞中大量扩增并通过氯化铯密度梯度离心法纯化,并测定其滴度。结果利用PCR反应进行鉴定,扩增得到的hEndostatin经酶切鉴定,DNA测序证实为重组腺病毒,测定病毒滴度为5.2×109PFU/ml。结论本实验成功构建了人分泌型内皮抑素重组腺病毒Ad-hEndo,可直接用于血管生成依赖性疾病基因治疗的实验研究。     

Construction and identification of adenovirus vector for double-mutant human hypoxia-inducible factor-1alpha gene]

OBJECTIVE: To construct an adenovirus vector containing the double-mutant hypoxia-inducible factor-1alpha (HIF-1alpha) gene for exploring the therapeutic angiogenesis for coronary heart disease. METHODS: Human double-mutant HIF-1alpha cDNA was obtained from PCR of pShuttle-2-HIF-1alpha containing the mutant HIF-1alpha gene (564). The recombinant adenoviral plasmid containing mutant HIF-1alpha cDNA was constructed by ligation of recombinant pShuttle2 containing double-mutant HIF-1alpha cDNA and Adeno-X viral DNA, followed by its identification and transfection into adenoviral packaging cells HEK293 via lipofectamine 2000. RESULT AND CONCLUSION: The recombinant pAdeno-HIF-1alpha was correctly constructed and verified by restriction endonuclease and DNA sequencing analyseis. This recombinant adenovirus containing the double-mutant HIF-1alpha gene may facilitate further investigation of mutant HIF-1alphagene therapy for coronary heart disease.     

SHP-1基因重组腺病毒的构建与表达

目的 构建并鉴定人蛋白酪氨酸磷酸酶基因(SHP-1)重组腺病毒Ad-SHP1.方法 将人SHP-1 cDNA克隆于穿梭质粒pAdTrack-CMV,PmeⅠ线性化后,与腺病毒骨架质粒pAdEasy-1共转化BJ5183细菌,获得带有SHP-1基因的重组腺病毒质粒pAd-SHP1,经PacⅠ线性化后通过Lipofectamine2000转染HEK293包装细胞,观察细胞内绿色荧光蛋白表达情况.收获重组腺病毒,经PCR和Western Blotting鉴定后,扩增并纯化重组腺病毒,测定病毒滴度.结果 经测序、酶切电泳和感染后蛋白表达检测均表明成功构建重组腺病毒Ad-SHP1;病毒滴度为1.58×1010 pfu/mL.结论 成功构建带有人SHP-1 cDNA的重组腺病毒,为进一步研究结外鼻型NK/T细胞淋巴瘤发生机制及肿瘤的基因治疗奠定了基础.     

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。     

重组腺病毒载体pAd-NY-ESO-1-EGFP的构建及鉴定

目的:利用细菌内同源重组法构建含人肿瘤特异性抗原的腺病毒质粒。方法:设计NY-ESO-1 cDNA扩增引物,从pET15b-NY-ESO-1质粒中扩增NY-ESO-1的DNA序列,与pShuttle-IRES-hrGFP-2进行连接,PCR和EcoRⅤ酶切鉴定重组质粒pShuttle-NY-ESO-1-EGFP,经Pm eⅠ酶切线性化后,转化含pAdeasy-1的超感受态B J5183大肠杆菌,细菌内同源重组法构建腺病毒质粒pAd-NY-ESO-1-EGFP;质粒经PacⅠ酶切鉴定,DNA测序。结果:线性化的pShuttle-NY-ESO-1-EGFP转化含pAdeasy-1的超感受态B J5183大肠杆菌,重组质粒经酶切获得一大于23 kb的大片段和4.5 kb的片段,PCR反应扩增出了340 bp的片段。结论:用细菌内同源重组法成功地构建了含NY-ESO-1的重组腺病毒质粒,为进行表达NY-ESO-1的重组腺病毒的制备及肿瘤特异性抗原NY-ESO-1的核酸疫苗在肿瘤方面的研究奠定了基础。     

IP-10重组腺病毒载体的构建及其病毒制备

目的利用细菌内同源重组法构建带有增强型绿色荧光蛋白(EGFP)标签的!-干扰素诱导蛋白10(IP-10)重组腺病毒载体并制备重组腺病毒。方法将IP-10编码序列克隆入带有EGFP示踪的腺病毒穿梭质粒pAdTrack-CMV中,形成转移载体pAdTrack-CMV/IP-10,将其在大肠杆菌BJ5183内与腺病毒骨架质粒pAdEasy-1同源重组,得到重组腺病毒载体pAd/IP-10;酶切鉴定正确后转染HEK293细胞。收集病毒上清,PCR鉴定正确后,扩增并再次感染HEK293细胞检测病毒感染能力。结果重组质粒经酶切、PCR和测序鉴定正确无误,并在HEK293细胞中包装成有感染活性的病毒颗粒。结论成功地构建了表达IP-10蛋白的重组腺病毒载体并制备了重组腺病毒Ad/IP-10,为研究IP-10的蛋白功能提供了一个重要工具。     

抑制HBV复制的小干扰RNA的重组腺病毒构建与鉴定

目的构建可同时表达绿荧光蛋白（GFP）和针对HBVS区基因的小干扰RNA（siRNA）的重组腺病毒,并研究该siRNA在体外对HBV的抑制作用。方法采用PCR技术自质粒pEGFP-C1中扩增含CMV启动子的GFP表达框,自质粒pAVU6＋4sh579中扩增含U6启动子的针对HBV S 区579-597位基因的siRNA表达框,分别将两个表达框克隆至穿梭载体质粒pShuttle内,与质粒pADEasy-1在大肠杆菌BJ5183内进行同源重组,将阳性重组体DNA转染至人胚肾细胞株HEK293细胞中进行包装、扩增,并在HepG2.2.15细胞中初步观察其对HBV复制的抑制疗效。结果构建了可同时表达GFP和siRNA的重组腺病毒,其可在HEK293细胞中进行包装、扩增,并在HepG2.2.15细胞中对HBV-DNA、HBsAg和HBeAg的表达具有抑制作用。结论成功构建了可同时表达GFP和针对HBV的siRNA的重组腺病毒,并在体外实验中证实了其对HBV复制具有抑制作用。