细胞因子对HCV基因疫苗诱生免疫反应的增强作用

目的 探讨细胞因子对丙型肝炎病毒（ＨＣＶ）核心（Ｃ）基因疫苗诱生免疫应答强度的增强作用。方法 将包含ＨＣＶ－Ｃ蛋白的基因片段插入真核表达载体ｐｃＤＮＡ３中,构建重组质料ｐｃＤＮＡＨＣＶ－Ｃ,将此重组质粒单独或与包含鼠ＩＬ－２或ＩＬ－１２基因的表达质粒共免疫ＢＡＬＢ／ｃ小鼠,ＥＬＩＳＡ法检测ＨＣＶ Ｃ特异性抗体产生情况,以ｐｃＤＮＡＨＣＶ－Ｃ转梁小鼠ＳＰ２／０细胞,表达ＨＣＶ Ｃ抗原为靶细胞,进行     

抑癌基因MTS1真核表达载体的构建及其在卵巢癌细胞系 …

目的：构建多肿瘤抑制基因１（ＭＴＳ１）的真核表达载体的构将其转入人源性卵巢癌细胞株ＨＯ－８９１０中,并得到稳定表达,为进一步研究其对卵巢癌细胞的影响奠定实验基础。方法：利用ＢａｍＨⅠ与ＥｃｏＲⅠ从ｐＵＣ１９－ｐ１６质粒上下ＭＴＳ１ ｃＤＮＡ片段并克隆到真核表达载体ｐｃＤＮＡ３上,构建成ＭＴＳ１真核表达载体ｐｃＤＮＡ３－ｐ１６导入人源性卵巢癌细胞株ＨＯ－８９１０中;采用ＡＢＣ法对转染后的不同代数细胞     

携带内皮型一氧化氮合酶基因重组腺病毒载体的构建

目的：构建带有内皮型一氧化氮合酶（ｅＮＯＳ）基因的重组腺病毒载体。方法：将ｅＮＯＳ　ｃＤＮＡ克隆于腺病毒穿梭质粒ｐＣＡ１４，得到重组质粒ｐＣＡ１４－ＣＭＶ－ｅＮＯＳ。采用磷酸钙ＤＮＡ沉淀法将质粒ｐＣＡ１４－ＣＭＶ－ｅＮＯＳ与腺病毒拯救质粒ｐＢＨＧ１０共转染２９３细胞，通过同源重组，生成带有ｅＮＯＳ基因的复制缺陷型重组腺病毒载体（ＡｄＣＭＶｅＮＯＳ）。ｅＮＯＳｃＤＮＡ重组进入腺病毒Ｅ１区并受ＣＭＶ启动子控制。结果：经形态学、病毒ＤＮＡ酶切、ＰＣＲ和ＲＴ－ＰＣＲ等方法的鉴定，证实了载体构建的正确性。结论：带有ｅＮＯＳ基因的重组腺病毒载体的成功构建，为心血管等疾病的基因治疗打下了基础。     

重组丙型肝炎病毒基因载体的构建与表达

应用基因重组技术。从载体ＣＤＺ２酶切获得１．７３ｋｂＤＮＡ片段（含１６ｄ９３ｂｐ的ＨＣＶ结构区ｃＤＮＡ，其特异性已为ｓｏｕｔｈｅｒｎｂｌｏｔ证实）。将ＨＣＶｃＵＮＡ片段插入载体ｐｃＤＮＡ３，构建ＨＣＶ重组体。经在大肠杆菌中表达，筛选、酶切分析，获得重组ＨＣＶ（ＰｃＤＮＡ３－ＨＣＶ）。以重组质粒转染Ｈ９细胞（ＣＤ淋巴细胞系），用Ｇ４１８筛选出抗性细胞。经ＲＴ－ＰＣＲ、ｄｏｔ－ＥＬＩＳＡ验证表明，ｐｃＤＮＡ３－ＨＣＶ能在Ｈ９细胞中进行复制、转录和表达。这为丙型肝炎发病机理的研究提供了一个有用模型。     

HCV核心蛋白DNA疫苗诱导的小鼠体液免疫应答

目的：观察丙型肝炎病毒（ＨＣＶ）核心蛋白ＤＮＡ疫苗诱导ＢＡＬＢ／ｃ小鼠体液免疫应答的效力，为研制应用于人类的ＨＣＶ ＤＮＡ疫苗提供实验依据。方法：将全长ＨＣＶ核心蛋白基因插入真核表达质粒载体ｐｃＤＮＡ３．１，构建ＨＣＶ核心蛋白重组表达质粒ｐｃＤＮＡ３．１ＨＣＶｃｏｒｅ，肌注ＢＡＬＢ／ｃ小鼠，以ＥＬＩＳＡ法检测小鼠血清ＨＣＶ抗体。以此重组质粒转染小鼠ＮＩＨ３Ｔ３细胞，以ＨＣＶ抗体阳性小鼠血清为捕获抗     

抑癌基因MTS1真核表达载体的构建及其在卵巢癌细胞系HO-8910中的表达

目的：构建多肿瘤抑制基因１（ＭＴＳ１）的真核表达载体,将其转入人源性卵巢癌细胞株ＨＯ－８９１０中,并得到稳定表达,为进一步研究其对卵巢癌细胞的影响奠定实验基础．方法：利用ＢａｍＨⅠ与ＥｃｏＲⅠ从ｐＵＣ１９－ｐ１６质粒上切下ＭＴＳ１ｃＤＮＡ片段并克隆到真核表达载体ｐｃＤＮＡ３上,构建成ＭＴＳ１真核表达载体ｐｃＤＮＡ３－ｐ１６;利用脂质体（Ｆｕ－ＧＥＮＥＴＭ６）介导的基因导入法将ｐｃＤＮＡ３－ｐ１６导入人源性卵巢癌细胞株ＨＯ－８９１０中;采用ＡＢＣ法对转染后的不同代数细胞进行免疫细胞化学检测,观察ｐ１６蛋白的表达．结果：成功构建了ＭＴＳ１真核表达载体ｐｃＤＮＡ３－ｐ１６,并进行酶切鉴定;转染后经Ｇ４１８筛选２ｗｋ出现阳性克隆８９１０－ｐ１６,并检测到其中有ｐ１６蛋白的稳定表达．结论：成功构建ＭＴＳ１真核表达载体ｐｃＤＮＡ３－ｐ１６,并可在人源性卵巢癌细胞株ＨＯ－８９１０中得到稳定表达．     

乙型肝炎病毒DNA转染细胞的一种内参标准:真核细胞报告基因SEAP

目的 建立用真核细胞报告基因ＳＥＡＰ转染人肝癌细胞系及鸡肝癌细胞系（ＬＭＨ）的表达系统,供研究ＨＢＶ基因功能应用。方法 分别将带有分泌性碱性磷酸酶（ＳＥＡＰ）报告基因的ｐＢＣ１２／ＰＬ／ＳＥＡＰ及ｐＢＣ１２／ＣＭＶ／ＳＥＡＰ质粒ＤＮＡ转染Ｈｕｈ７、ＨｅｐＧ２及ＬＭＨ细胞,并用ｐＢＣ１２／ＣＭＶ／ＳＥＡＰ质粒ＤＮＡ与Ｓ基因区变异体的克隆ＨＢＶ ＤＮＡ共转染ＨｅｐＧ２细胞。培养后收取细胞培养液,用ＥＬ     

阳离子脂质体介导血管内皮生长因子的基因表达

以ＲＴ－ＰＣＲ自人胎肝中克隆和筛选血管内皮生长因子全长ｃＤＮＡ，测序鉴定正确后，插入真核表达载体ｐＡｄＣＭＶｌｉｎｋ１中的ＥｃｏＲＩ和ＫｐｎＩ位点。用ｌｉｐｏｆｅｃｔ ＡＭＩＮＥ体外介导转染ＣＨＯ细胞，收集转染后２４ｈ至第５ｄ的培养上清，用ＲＴ－ＰＣＲ检测转染细胞中外源ＶＥＧＦ１６５基因的转当，Ｍｉｌｅｓ试验检测细胞培养上清中ＶＥＧＦ的生物活性。     

乙型肝炎病毒核心抗原特异性细胞毒性T淋巴细胞作用的靶细胞的建立

目的建立ＨＢｃＡｇ特异性ＣＴＬ作用的靶细胞系统,为进一步研究ＨＢＶ基因变异对ＣＴＬ细胞毒效应的影响奠定基础。方法采用两种质粒ｐＸＴ１和ＥＢＯ－ｐｌｐｐ构建ＨＢＶＣ基因真核细胞表达载体并转染水生化Ｂ细胞,ＤＮＡ分析和流式细胞仪检测ＨＢＶＣ基因在宿主细胞中的复制、表达。结果在转染重组质植ｐＸＴ１－ＨＢＶｃ和ＥＢ０－ｐｌｐｐ－ＨＢＶｃ的Ｂ细胞中,均能检测到目的基因;分另有８９．８１％和８８．５１％的宿主细胞能检测到ＨＢｃＡｇ;连续培养３周后,分别有８８．３０％和７２．１９％的宿主细胞表达ＨＢｃＡｇ。结论重组逆转录病毒表达载体ｐＸＴ１－ＨＢＶｃ和ＥＢ病毒表达载体ＥＢＯ－ｐｌｐｐ－ＨＢＶｃ转染的永生化人外周血Ｂ细胞能有效地表达靶抗原（ＨＢｃＡｇ）,可作为较为理想的ＨＢＶ特异性ＣＴＬ作用的靶细胞。     

t－PA cDNA基因在CHO细胞中的稳定表达

建立稳定表达人组织型纤溶酶原激活剂（ｔｉｓｓｕｅ－ｔｙｐｅｐｌａｓｍｉｎｏｇｅｎａｃｔｉｖａｔｏｒ，ｔ－ＰＡ）的细胞株。将ｔ－ｐＡｃＤＮＡ连接在真核表达载体ｐｃＤＮＡ３的ＨｉｎｄⅢ位点，构建成重组质粒ｐｃＤＮＡ３ｔＰＡ，用磷酸钙介导的贴壁细胞转染法导入哺乳动物中国仓鼠卵巢（ＣＨＯ）细胞中，Ｇ４１８筛选培养后形成阳性克隆。结果：培养液中重组ｔ－ｐＡ（Ｒｅｃｏｍｂｉｎａｎｔｔ－ｐＡ，ｒｔ－ｐＡ）活性＞６０００ＩＵ／１０６细胞ｄ－１．Ｎｏｒｔｈｅｒｎ杂交证实ｔ－ＰＡｃＤＮＡ基因的转录。高表达细胞连续传代１０次后，培液中ｒｔ－ｐＡ活性未见明显变化。结论：转染ｔ－ＰＡｃＤＮＡ基因的ＣＨＯ细胞已形成稳定的工程细胞。     

Eg95基因疫苗不同免疫途径的体液免疫应答比较

目的：用构建的细粒棘球蚴95(Eg95)抗原基因真核表达重组质粒pcDNA3-Eg95．直接免疫小鼠，观察其所诱导的体液免疫反应。方法：碱裂解法大量提取重组质粒。采用肌肉注射、静脉注射、皮下注射3种免疫途径和不同剂量的重组质粒免疫小鼠．用ELISA法测定小鼠血清抗体滴度。结果：在相同剂量下，重组质粒免疫小鼠刺激机体产生抗体反应强度的免疫途径依次为肌肉、皮下和静脉注射，阳性反应率由高到低依次为皮下、肌肉和静脉注射。以肌肉注射方式免疫小鼠的抗体反应维持时间较长，主要产生IgG2a为主的抗体。结论：用pcDNA3-Eg95重组质粒DNA免疫小鼠可以产生体液免疫应答。     

Humoral immune response to HCV core DNA vaccine in mice

DNAvaccine,alsocallednucleicacidvaccine,isarecombinanteukatyoticexpressionplasmidencodingcertainantigenofpathogen.DNAvaccinecanexpressantigenandinducecellularandhumoralimmuneresponsesaftervaccinationbyintramuscularinjectionorplasmid--coatedmicroparticlebombardment.Itshightemperaturestability,lowexpenseofmassproductionandtheabilitytoinducestrongimmuneresponsesevenfortheuseintherapyhavemadeDNAvaccineanexcitingwayfornewvaccinedevelopment['J.InordertofurnishevidenceforHCVDNAvaccinesuitablefo…     

Effect of immunization in mice with recombinant DNA encoding the hepatitis C virus structural protein

OBJECTIVE: To explore the possibility and the efficacy of immune responses in mice inoculated with recombinant plasmid pCD-HCV1 and to lay a foundation for HCV nucleic acid vaccine development in the future. METHODS: The gene fragment coding C and E regions of HCV-II (type I b) was inserted into pCD-SR alpha 1 expression vector and formed pCD-HCV1 and then was injected into quadriceps muscles of Balb/c mouse. Serum anti-HCV level of mice was tested by ELISA (A value). Spleen cells proliferation responses to HCV antigens were detected by 3H-TdR incorporation (cpm). RESULTS: Balb/c mice immunized with recombinant plasmid pCD-HCV1 three or four times can generate specific antibody responses to HCV antigens and the antibody levels gradually ascend to the plateaus and did not have the trend of descending in 18 weeks detected. The serum antibodies in mice immunized by recombinant plasmid pCD-HCV1 were 100 percent positive when the serum were diluted 40 times and the positive rate of antibody still were 16.6 percent positive when the serum were diluted 320 times. Balb/c mice immunized with recombinant plasmid pCD-HCV1 (100 micrograms, 50 micrograms 10 micrograms/mouse three times respectively) can elicit antibody responses to HCV antigens and the antibody levels of three groups were 0.70 +/- 0.07, 0.33 +/- 0.04 and 0.11 +/- 0.09 respectively. Spleen cells of Blab/c mice injected with pCD-HCV1 three times were induced to produce proliferation responses to HCVc + e specific antigens. CONCLUSIONS: These results demonstrated that constructs expressioning HCV core and envelope proteins can generate anti-HCVc + e specific antibody responses and lymphoproliferation responses in mice, which suggested it to be possible to elicit immune responses to viral epitopes from HCV via DNA immunization with HCV-DNA recombinant and to warrant further investigation as a potential vaccine against HCV infections.     

地方株HPV16L1基因诱发的小鼠体液免疫反应

目的检测pcDNA-L1的表达,评价地方株HPV16L1基因疫苗诱导的体液免疫反应.方法采用PCR技术从宫颈癌组织中获得L1基因,以pGEM-T Easy为克隆载体构建重组质粒pGEM-T-L1,进行限制性核酸内切酶及核苷酸序列分析,再将L1基因亚克隆到真核表达载体pcDNA3.1（-）中,构建地方株HPV16L1基因疫苗,转染COS-7细胞,通过IFA试验验证L1蛋白的表达.用pcDNA-L1肌肉内注射方法分别于第1天、第15天和第43天免疫6周龄BABL/c小鼠,在特定时间段采血分离血清,IFA分析基因免疫在小鼠体内诱导的免疫应答,设pcDNA载体对照.结果pcDNA-L1能够在COS-7细胞中暂态表达,免疫小鼠后能检测出特异的抗体,用IFA方法在第一次免疫后的第30、60和180天均可检测到抗体;原载体免疫后未检出特异抗体.结论本实验构建的地方株HPV16L1基因疫苗可诱导产生特异性的体液免疫反应.     

Immune responses to the expressed products of the CSP antigen gene of Plasmondium falciparum south in China isolate FCC1/HN in Hela cell

Immune responses to the expressed products of the CSP antigen gene of Plasmondium falciparum south in China isolate FCC1/HN in Hela cell@Yu XB @Liu YW @Luo SH     

Immune responses to the expressed products of the CSP antige n gene of Plasmodium falciparum southern China isolate FCC1/HN in Hela cell

Objective To construct a eukaryotic expression system with pcDNA3-PfCSP/Hela for the Circ umsporozoite protein (CSP) gene of Plasmodium falciparum (P.falciparum), t o observe the immune responses in BALB/c mice induced by the expressed proteins .Methods The recombinant plasmid pcDNA3-PfCSP was transformed into the Hela cell line. The expressed protein was isolated and analyzed by using SDS-PAGE and used for immunization of BALB/c mice by subcutaneous, intravenous, and intraperitone al adminstration.Enzyme-linked immunosorbent assay(ELISA), Dot-ELISA, Wester n blot, T lymphocyte proliferation test, natural killer cell(NKC) activity assay , and CD4(+) and CD8(+) T cell detection were used for observation of humoral an d cellular immune responses.Results Immune sera strongly reacted with the expressed protein, antibody titer was up to 1∶6400 as detected by ELISA.Western blot analysis revealed a specific b and at 38.3 Kda.When the spleen cells of normal and immunized BALB/c mice we re specifically stimulated with expressed protein, the optical densities were 0 .12±0.03 and 0.34±0.04, respectively.The latter were significantly highe r than the former (P<0.01).We used the MTT colorimetric assay to measure NKC activity of mice spleen.The results showed that the NKC activity of immuni zed BALB/c mice was remarkably higher than that of the controls (P<0.05). CD4(+) and CD8(+) T cells were detected by using monoclonal antibody immunofluor escence methods.The results showed that the percentage of CD4(+) and CD8(+) T cells of immunized group were significantly higher than that of control group ( P<0.05).Conclusions The humoral and cell-mediated immune responses and elevated NKC activity to pr oducts made with a eukaryotic expression system could be specifically detected i n BALB/c mice.These findings indicate that the expressed protein could enhance the immune function in mice.     

共刺激分子B7-1与汉坦病毒核蛋白基因共表达载体的构建及免疫调节作用

目的:探讨共刺激分子B7-1(CD80)对汉坦病毒核蛋白基因疫苗的免疫调节作用.方法:构建双启动子共表达B7-1基因和汉坦病毒核蛋白基因的真核表达载体pcDNA 3.1-B7-S,酶切鉴定后直接肌注免疫BALB/c小鼠,同时设对照组pcDNA 3.1 空质粒接种组、pcDNA 3.1-S接种组.ELISA法检测血清特异性抗体,MTT法检测T细胞增殖反应.结果:pcDNA 3.1-B7-S接种组鼠在抗体的产生水平及淋巴细胞增殖指数上均较pcDNA 3.1-S接种组明显增高.结论:接种B7-1基因和汉坦病毒核蛋白基因的共表达质粒优于注射单目的抗原基因表达质粒,为探索增强基因疫苗的免疫作用提供了新的途径.     

弓形虫P30-P22复合DNA疫苗免疫小鼠诱导的体液免疫应答

目的通过肌内注射弓形虫DNA疫苗PCDNA3．1-P30-P22直接免疫小鼠，观察其诱导的体液免疫应答及保护性作用。方法大量制备重组真核表达质粒PCDNA3．1-P30-P22，肌内注射免疫小鼠，ELISA法测定其抗体滴度的变化，用弓形虫作致死性攻击感染。结果实验组抗体水平明显高于对照组，二者存在显著性差异(P＜0．05)；攻击感染后实验组小鼠存活时间明显延长(P＜0．05)。结论重组真核表达质粒PCDNA3．1-P30-P22肌注BALB/C系小鼠可诱导一定的体液免疫应答，对攻击感染具有一定的保护性。     

丙型肝炎病毒核心区与IgG Fc段融合基因疫苗的构建及表达

目的：构建能同时表达丙型肝炎病毒核心区与IgG Fc段的融合基因真核表达载体pcDNA3 HCV C-Fe，为下一步修饰和转染树突状细胞，制备能高效表达HCV C和Fc基因的树突状细胞疫苗做准备。方法：用分别含有Xhol I和Xba I初位点的人免疫球蛋白(IgG)Fc区基因上、下游引物，以含有人IgG基因序列的质粒pCMVsFc为模板，通过PCR扩增获得Fc区基因片段，基因片段回收后，以Xhol I和Xba I双酶切，定向插入到含HCV C基因的质粒PcDNA3 HCV C下游双粘端位点之间，获得重组表达质粒pcDNA3 HCVFc。通过酶切、PCR及插入片段序列测定对质粒进行鉴定。以抗HCV C和抗Fc单克隆抗体为一抗，利用间接免疫荧光法检测pcDNA3 HCV-Fc在人肝癌细胞7721中的瞬时表达。结果：酶切、PCR及测定鉴定证实，pcDNA3 HCV—Fc插入片段为Fc区基因片段，免疫荧光法检测表明其可以在7721细胞中瞬时表达。结论：构建的质粒pcDNA3 HCV—Fc可以在7721细胞中瞬时表达Fc基因，为研究HCV C—Fc融合基因修饰的树突状细胞的功能奠定了基础。