Experimental study of adenovirus vector mediated-h VEGF<Subscript>165</Subscript> gene on prevention of restenosis after angioplasty

Summary This study evaluated the effects of adenovirus vector mediated human vascular endothelial growth factor-165 (hVEGF₁₆₅) gene on prevention of restenosis after angioplasty. Rabbit models of bilateral carotid artery injury were established by balloon denudation. The recombinant adenoviruses containing hVEGF₁₆₅ cDNA was directly injected into left side of the injured carotid arteries. On day 3 and week 3 after transfection the expression of VEGF was observed by RT-PCR and immunohistochemistry. The thrombokinesis, reendothelialization (rET) and intimal hyperplasia in carotid arteries were evaluated by computerized image analysis system 3 weeks after gene transfer. The changes in the VEGF gene-treated side were compared with the control side. Our results showed that 3 days and 3 weeks after hVEGF₁₆₅ gene transfer the VEGF mRNA and antigen expression were detectedin vivo. 3 weeks after the transfer, the carotid artery rET was markedly better in the VEGF gene-treated group compared with the control. The thrombokinesis, intima area/media area (I/M), maximal intimal and medial thicknesses (IT_max and MT_max) demonstrated a statistically significant decrease in arteries treated with VEGF gene as compared with the control group. It is concluded that VEGF gene transfer could be achieved by intra-arterial injection of recombinant adenoviruses. It might accelerate the restoration of endothelial integrity, inhibit thrombokinesis and attenuate intimal hyperplasia in the injured arteries after VEGF gene transfer. This procedure could be useful in preventing restenosis after angioplasty. Liu Qigong, male, born in 1968, Associate Professor This project was supported by a grant from Wuhan Chenguang Program (No. 20015005048)     

人血管内皮生长因子165与嵌合水蛭肽融合基因防治兔颈动脉损伤后再狭窄的实验研究

目的观察人血管内皮生长因子165（hVEGF165）与嵌合水蛭肽融合基因（fused hirudin,FH）对兔颈动脉损伤后再狭窄的防治作用,为再狭窄的基因治疗提供新的思路。方法通过基因重组构建hVEGF。与FH的融合基因（hVEGF165-FH）。制备免颈总动脉血管成形术损伤后再狭窄模型,损伤局部转染该融合基因作为治疗组。同时局部转染pcDNA3．0空质粒作为对照组,通过血管造影、病理分析等观察融合基因是否抑制兔颈总动脉血管成形术后再狭窄。结果局部转染融合基因后1周和3周,造影显示治疗组血管狭窄程度与对照组比较显著减轻;病理分析显示。治疗组较对照组管腔狭窄程度显著减轻（1周：11．50％vs33．25％;3周：19．75％vs52．25％,P〈0．05）;治疗组较对照组内膜增生程度（内膜／中膜,I／M）显著减轻（1周：0．12vs0．50;3周：0．35vs1．07,P〈0．05）。同时融合基因对血管损伤处的血栓形成有抑制作用,但对系统凝血指标无影响,无全身出血并发症。结论融合基因hVEGF165-FH可有效地预防兔颈动脉成形术后再狭窄。以内皮修复为基础,构建双靶点甚至多靶点的融合基因可能是未来再狭窄防治的一个有效策略。     

hVEGF基因防治血管成形术后再狭窄

目的 :观察人血管内皮生长因子 (h VEGF)基因对血管成形术后再狭窄的防治作用。 方法 :建立兔颈总动脉球囊损伤模型 ,以先期构建的真核表达质粒 pc DNA3/ h V EGF1 6 5 (5 0 0 μg,n=12 )和真核载体 pc DN A3(5 0 0 μg,n=12 )分别于血管腔内给药 ,给药后 2周、4周先行颈总动脉造影 ,再取材分别行 H- E、VB染色及 Northern blot分析。结果 :给药后 2周、4周颈总动脉造影示治疗组直径狭窄较对照组明显减少 ;病理检测示 2周、4周治疗组管腔狭窄率较对照组显著减轻 [(9.5 8± 1.35 ) % vs(31.72± 1.72 ) % ;(18.0 9± 2 .93) % vs (44 .0 5± 3.2 8) % ,P<0 .0 1];Northern blot分析显示 2周、4周治疗组特异性条带显色较对照组明显增强。 结论 :pc DNA3/ h VEGF1 6 5 裸质粒 DNA血管腔内给药能转染平滑肌细胞并持续表达至少 4周 ,促进了内皮细胞再生 ,减轻了血管成形术后再狭窄程度。     

脉冲电场介导AT2R基因在血管局部表达及其对血管新生内膜的影响

目的研究脉冲电场对血管紧张素2型受体(AT2R)基因在血管局部表达的作用,探讨AT2R基因在体转染对大鼠颈动脉球囊损伤后新生内膜增生的作用。方法大鼠颈动脉球囊损伤后,用脉冲电穿孔法介导AT2R cDNA真核表达质粒或空质粒载体在动脉局部表达,于术后3、7 d和21 d用免疫组织化学、HE染色等方法,进行AT2R在颈动脉壁中表达的变化及定量组织形态学分析。结果免疫组织化学染色结果显示:脉冲电场介导AT2R cDNA真核表达质粒表达后,3 d时可见内膜、中膜、外膜大量AT2R的棕色阳性着色,7 d时可见少量棕色阳性着色,21 d棕色阳性着色几乎消失,未转染组及空质粒转染组未见AT2R的棕色阳性着色,表明脉冲电穿孔能有效导入AT2R基因,并在动脉壁获得稳定表达。在21 d时,AT2R cDNA真核表达质粒组的内膜面积与中膜面积比显著低于未转染组和空质粒载体组[分别为(0.76±0.08)、(1.39±0.08)、(1.32±0.10),P<0.01],空质粒转染组和未转染组间无统计学差异(P>0.01)。结论脉冲电穿孔可介导AT2R基因在血管局部有效表达,AT2R在体转染可抑制球囊损伤后大鼠颈动脉平滑肌细胞增殖和新生内膜增生。     

腺病毒介导的AT2R基因转染对培养大鼠颈动脉内膜增生的影响

目的构建AT2R重组腺病毒载体并研究AT2R对动脉损伤后新生内膜增生的影响.方法将AT2R基因克隆至腺病毒载体,构建AT2R重组腺病毒;球囊损伤大鼠颈动脉后立即取下颈动脉,用重组腺病毒转染,在体外培养2周后,观察AT2R基因转染对损伤动脉新生内膜形成的影响.结果构建的AT2R重组腺病毒经鉴定正确,其滴度为1×109pfu/ml;AT2R重组腺病毒转染可明显抑制培养大鼠颈动脉新生内膜增生.结论成功构建了AT2R重组腺病毒载体;AT2R可明显抑制大鼠颈动脉球囊损伤后的新生内膜增生.     

血管内皮生长因子基因治疗兔下肢缺血的实验研究

目的：了解血管内皮生长因子（ＶＥＧＦ）基因治疗兔下肢缺血模型后新生血管和侧支循环形成状况。方法：构建ｈＶＥＧＦ１６５的真核表达载体,通过直接肌肉注射将ｈＶＥＧＦ１６５基因转染缺血部位肌细胞,经颈总动脉插管行下肢血管造影。结果：ＶＥＧＦ治疗组在质粒转染后２和４周动脉血管造影显示,新生血管数目和侧枝血管形成较对照组明显增加。结论：肌细胞能够吸收裸露的ＶＥＧＦ ｃＤＮＡ质粒并获得局部高效表达,产生刺激体     

转导C型钠尿肽基因对血管成形术后新生内膜增生及内皮功能的影响

OBJECTIVE: To investigate the effects of C-type natriuretic peptide (CNP) gene transduction on neointimal hyperplasia and endothelial function after angioplasty. METHODS: Eighty-four rabbits were divided into 3 equal groups, namely normal control group, alkaline phosphatase gene transduction group and CNP gene transduction group. The rabbits in the latter two groups were given high-cholesterol diet 7 d before the experiment, followed by establishment of restenosis models by injuring the iliac artery and the specified gene transfer via retroviral vectors. Those in the normal control group were fed with normal diet. Before high-cholesterol diet and killing respectively, 2 ml venous blood samples were taken for testing blood lipid and serum CNP concentration. In the two groups with gene transduction, the injured rabbit iliac arteries were harvested for ex vivo vascular ring tension test, histological and pathological examinations, as well as immunohistochemistry analysis of CNP. The lumen area, neointimal thickness, neointimal area, ratio of intimal to medial area were measured by image analysis system. RESULTS: There were no significant differences in blood lipid and serum CNP concentration between the two gene transduction groups at the same time points both before and after operation. In CNP gene transduction group, endothelium-dependent relaxation of the vascular rings was significantly improved in comparison with the other two groups (P<0.01), irrespective of L-Arg pretreatment, whereas endothelium-independent relaxation function varied little between the 3 groups (P>0.05). Poor relaxation function to Ach of the vascular rings was resulted after pretreatment with LMMA. CNP gene expression at the site of gene transfer was detected in the CNP gene transduction group and in 2 weeks after balloon injury, the neointimal thickness, neointimal area and ratio of the neointimal to tunica media area were markedly increased in the two gene transduction groups, but the measurements were significantly lower in CNP group (P<0.01). CONCLUSION: CNP gene can be successfully transferred and effectively expressed at the injured site in the blood vessels to decrease the hyperplasia and significantly improve endothelial function after angioplasty.     

人血管内皮细胞生长因子165重组腺病毒的构建及其在真核细胞中的表达

目的:体外构建人血管内皮生长因子165(hVEGF165)的腺病毒表达载体,并检测其在HEK293细胞中的表达。方法:从重组质粒pcDNA3/hVEGF165中获得hVEGF165,经酶切及测序鉴定,将hVEGF165基因亚克隆到穿梭质粒pAdTrack-CMV,重组穿梭质粒经酶切线性化后,与pAEdasyl质粒在大肠杆菌BSJ183中进行同源重组,线性化后转染HEK293细胞进行包装扩增获取重组病毒上清,同时应用RT-PCR及ELISA法检测hVEGF165的表达。结果:目的基因的测序结果与人VEGF165序列(Genbank)相符。转染后经RT-PCR和ELISA检测证实转染重组质粒组hVEGF165 mRNA及蛋白表达,而转染空质粒组及未转染组没有检测到hVEGF165的表达。结论:本研究构建了人VEGF165重组腺病毒表达载体pAd-hVEGF165,并能成功地在HEK293细胞中表达。     

反义c-myc寡脱氧核苷酸对大鼠腹主动脉损伤后内膜增生的影响

目的观察大鼠腹主动脉损伤后内膜增生的影响,为采用反义ｃｍｙｃ战略防治再狭窄的早期临床试验奠定基础。方法将反义ｃｍｙｃ反义寡脱氧核苷酸（ＯＤＮ）通过ｐｌｕｒｏｎｉｃｇｅｌ缓释系统和Ｌｉｐｏｆｅｃｔｉｎ转染导入系统,将其作用于大鼠腹主动脉损伤后的血管外膜,饲养三周后,处死动物,对所取的血管节段进行组织切片和弹力纤维染色,在显微镜下进行形态观察和采用图像分析系统进行图像分析,计算出内膜／中膜（Ｉ／Ｍ）面积之比和Ｉ／Ｍ厚度之比,并进行统计学分析。结果通过形态观察和Ｉ／Ｍ面积和Ｉ／Ｍ厚度之比,发现反义ｃｍｙｃＯＤＮ明显抑制了内膜增生,而且随着反义ｃｍｙｃＯＤＮ剂量的增加,其对内膜增生的抑制作用更加明显,而正义ｃｍｙｃＯＤＮ和错配ｃｍｙｃＯＤＮ与对照组相比,对内膜增生无影响。结论反义ｃｍｙｃＯＤＮ以剂量依赖性和序列特异性方式抑制了新生内膜的形成。为采用反义ｃｍｙｃ途径防治再狭窄的早期临床试验奠定了基础     

普罗布考和科素亚对兔血管成形术后生长因子的影响

目的：研究普罗布考和科素亚对兔血管成形术后再狭窄的预防作用及其对生长因子表达的影响。方法：雄性新西兰白兔40只,随机分为高胆固醇组、普罗布考组、科素亚组和联合用药组。1周后进行髂动脉球囊拉伤术,术后4周进行弹力纤维染色,用免疫组化检测血管胰岛素样生长因子-Ⅰ受体（insulin-like growth factor-Ⅰ receptor,IGF-IR）和内皮生长因子（vascular endothelial growth factor,VEGF）表达。结果：与高胆固醇组相比,普罗布考组、科素亚组和联合用药组管腔面积明显扩大（P〈0．01）,内膜面积明显减少（P〈0．05）,IGF-IR和VEGF表达明显减少（P〈0．01）,但3组间相比差异无统计学意义（P〉0．05）。结论：普罗布考和科素亚可以显著减轻兔髂动脉血管成形术后再狭窄的形成,抑制IGF—IR和VEGF的表达。联合用药与单独用药之间差异无统计学意义。     

人白细胞相关抗原B27及细菌多肽在脊柱关节病发病中的作用

目的了解细菌多肽应具备什么基本条件才能被人白细胞相关抗原（ＨＬＡ）Ｂ２７递呈而导致脊柱关节病。方法以来自衣原体热休克蛋白６０、能与Ｂ２７分子结合的９肽作为原型，用人工方法将９肽的每一个氨基酸残基均以另外１９种氨基酸替换，将合成的１８０种９肽分别与Ｂ２７Ｔ２细胞孵育，观察其与抗Ｂ２７单克隆抗体Ｂ２７Ｍ２的反应性。结果与Ｂ２７分子结合的９肽其第２位氨基酸残基应是精氨酸，以其它１９种氨基酸替换均使Ｂ２７Ｍ２的反应性明显降低；第６，８，９位氨基酸残基的选择性亦较高，仅有６～８种氨基酸能诱导与Ｂ２７Ｍ２的反应性；第３，５，７位氨基酸残基没有什么选择性，几乎任何一种氨基酸残基对Ｂ２７Ｍ２反应性的影响均不大。结论第２，９位氨基酸残基是９肽与Ｂ２７紧密结合所必需的，而第６，８位氨基酸可能与抗Ｂ２７单克隆抗体的识别有密切关系     

雷帕霉素洗脱支架抑制猪颈动脉成形术后近期再狭窄的实验研究

目的:研究自膨式雷帕霉素洗脱支架防治猪颈动脉血管成形术后近期再狭窄的有效性安全性,及其作用机制.方法:国产小型猪6只,分别行双侧颈总动脉球囊扩张损伤后,随机分为对照组(裸支架组)和实验组(雷帕霉素洗脱支架组),各置入6枚.术后4周重复动脉造影后处死动物.取出支架段血管,测算支架处血管管腔面积、新牛内膜厚度与面积及管腔狭窄百分比以评价内膜增生程度.应用TUNEL法检测新生内膜细胞凋亡指数(apoptotic index,AI),免疫组化检测血管平滑肌细胞中增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)、Bcl-2、Bax表达水平.结果:雷帕霉素洗脱支架组支架内管腔面积大于裸支架组(P<0.05);新生内膜面积小于裸支架组(P<0.05);新生内膜厚度小于裸支架组(P<0.05);细胞凋亡多于裸支架组(P<0.05):PCNA阳性细胞及Bcl-2表达低于裸支架组(P<0.05);Bax表达高于裸支架组(P<0.05).结论:雷帕霉素洗脱支架能抑制新生内膜形成.在支架植入后4周能预防猪颈动脉血管成形术后近期再狭窄的形成.可能通过上调Bax,下调Bcl-2的表达.从而抑制血管平滑肌细胞增殖发挥作用.     

血管球囊损伤后内膜增生及血管重塑对再狭窄的影响

目的:探讨在血管再狭窄形成过程中内膜增生及血管重塑的作用.方法:采用大鼠颈动脉球囊损伤后血管再狭窄的动物模型,经形态学观察及计算机图像分析,观测术后不同时间点血管壁各成分的变化. 结果:血管损伤后3 d血管内腔面可见增殖的血管平滑肌细胞,损伤后7 d新生内膜形成并继续增厚,损伤后28 d新生内膜厚度及面积达最大,损伤后35 d较损伤后28 d缩小(P<0.01). 损伤后各时间点中膜厚度无明显变化,但损伤后35 d的中膜面积较损伤后28 d及对照未损伤侧缩小(P<0.05). 管腔面积于损伤后前3 d略增大,损伤后7 d出现管腔面积减少,至损伤后28~35 d管腔面积明显小于对照未损伤侧(P<0.01). 外弹力膜内横截面积在损伤后3~7 d略增大,损伤后14 d最大,损伤后35 d较损伤后28 d及对照未损伤侧明显缩小(P<0.01). 结论:内膜增生与血管重塑是再狭窄形成的主要病理机制,血管再狭窄的形成是内膜增生与血管重塑的平衡所决定的,两者共同导致管腔狭窄.     

转导C型钠尿肽基因对血管成形术后新生内膜增生及内皮功能的影响

目的 观察局部转导C型钠尿肽(CNP)基因对血管损伤后内膜增生及内皮功能的影响。方法 将84只雄性新西兰大白兔随机均分为正常、对照和实验3组。3组高脂饮食喂养,对照组和实验组以球囊损伤兔髂动脉建立动脉粥样硬化兔再狭窄模型。对照组建模后局部转导逆转录病毒载体携带的碱性磷酸酶基因,实验组建模后后局部转导逆转录病毒载体携带的CNP基因(PLXSN-CNP)。于高脂饮食喂养前及处死前检测各组血脂和血CNP水平,对损伤的髂动脉进行离体血管环张力实验, 进行病理和CNP免疫组化学检测,采用计算机图像分析仪测量动物血管管腔面积、内膜厚度、内膜面积、内膜面积/中膜面积。结果 对照组和实验组血CNP水平和血脂水平在术前和术后同一时间点比较无显著差异。实验组血管经Ach和L-Arg 预处理+Ach处理后,内皮依赖性舒张功能显著强于正常组和对照组(P<0.01) 而非内皮依赖性舒张功能各组间无显著差异(P>0.05),而经LMMA预处理+ Ach 处理后血管环舒张功能明显变差;实验组在转染局部表达CNP基因;球囊损伤后2周,实验组和对照组血管内膜面积、内膜厚度、内膜/中膜比值显著增加,但实验组显著低于对照组(P<0.01)。结论 CNP基因可成功转导损伤血管,并有效地在局限表达;局部转导CNP基因可有效抑制血管成形术后内膜增生,增进内皮功能。     

家兔实验性血管成形术后再狭窄模型的建立

目的建立血管成形术（PTA）术后再狭窄的病理模型。方法选用日本大耳白兔30只，用电刺激颈总动脉加高脂饲料喂养8周后，依据彩色超声结果对颈总动脉狭窄动物行球囊扩张术，并普通饲料喂养4周，分别于电刺激8周、PTA术后4周处死取材，测定血脂、行HE、弹力纤维vanGieson染色及电镜观察和免疫组化分析。结果电刺激颈总动脉6周模型动物已有内膜增生，管腔狭窄，内膜下脂质沉积，PTA术后4周血管内膜增生更明显，管腔狭窄程度加重，增厚的内膜成分以平滑肌细胞和基质为主，内有大量泡沫细胞和巨噬细胞浸润。结论采用电刺激加高脂饲料喂养后再行球囊扩张的方法可形成明显的动脉狭窄，其病理过程及性质与临床的经皮球囊血管内成形术后再狭窄相似，且操作方法简单、实用，可用于再狭窄的病理机制及药物干预研究。     

Inhibitory effect of adenoviral vector-mediated AT2R gene transfection on neointimal hyperplasia

Objective： To investigate the effect of adenoviral vector-mediated AT2R gene transfection on neointimal hyperplasia after rat carotid artery balloon injury. Methods ：AT2R gene was transferred into rat carotid arteries by recombinant adenovirus pAd-AT2R after the establishment of rat carotid balloon injury restenosis model. The arteries were harvested on the 14th day after gene transfer. The efficiency of transgene delivery was measured by the expression of adenovirus-encoding green fluorescent protein （GFP） under fluorescent microscope. The expression of AT2R and PCNA （proliferating cell nuclear antigen） was evaluated by RT-PCR, immunocytochemistry, immunofluorescence staining, confocal microscopy, respectively. The ratio of intimal to medial area （I/M） was quantified with images and determined by an image analysis system. Results, GFP-positive area in adventitia, media and the forming neointima was about 40%. Adenoviral delivery of rat AT2R gene up-regulated AT2R expression in balloon-injured rat carotid and reduced PCNA expression and I/M significantly in neointima（P〈0.01）. Double immunofluorescence labeling of AT2R and PCNA also showed that AT2R gene transfer inhibited VSMCs proliferation in neointima. Conclusion： AT2R gene transfer may be a novel promising therapy to limit neointimal hyperplasia.     

A Preliminary Study of the Therapeutic Role of Human Early Fetal Aorta-derived Endothelial Progenitor Cells in Inhibiting Carotid Artery Neointimal Hyperplasia

Background:

Endothelial cell damage is an important pathophysiological step of restenosis after angioplasty and stenting. Cell transplantation has great therapeutic potential for endothelial recovery. We investigated the effect of transplanting endothelial progenitor cells (EPCs) derived from human early fetal aortas in rat injured arteries.

Methods:

The carotid arterial endothelium of Sprague-Dawley rats was damaged by dilatation with a 1.5 F balloon catheter, and then EPCs derived from human early fetal aortas (<14 weeks) were injected into the lumen of the injured artery in transplanted rats, with an equal volume of normal saline injected into control rats. Rats were sacrificed at 2 and 4 weeks after treatment and transplanted cells were identified by immunohistochemical staining with anti-human CD31 and anti-human mitochondria antibodies. Arterial cross-sections were analyzed by pathology, immunohistochemistry, and morphometry.

Results:

Green fluorescence-labeled EPCs could be seen in the endovascular surface of balloon-injured vessels after transplantation. The intimal area and intimal/medial area ratio were significantly smaller in the transplanted group than in the control (P < 0.05) and the residual lumen area was larger (P < 0.05). After EPC transplantation, a complete vascular endothelial layer was formed, which was positive for human von Willebrand factor after immunohistochemical staining, and immunohistochemical staining revealed many CD31- and mitochondria-positive cells in the re-endothelialized endothelium with EPC transplantation but not control treatment.

Conclusion:

EPCs derived from human early fetal aorta were successfully transplanted into injured vessels and might inhibit neointimal hyperplasia after vascular injury.     

川芎嗪抑制大鼠颈动脉球囊损伤后再狭窄的在体研究

研究川芎嗪对大鼠颈动脉球囊损伤后再狭窄的影响及机制。方法建立SD大鼠颈动脉球囊损伤模型,分为假手术组、模型组和川芎嗪组。川芎嗪组为川芎嗪[10mg（kg·d）]尾静脉预给药1周,球囊成形术后继续同剂量川芎嗪尾静脉注射6周。于第6周末收集损伤段颈动脉,病理切片HE染色测量内中膜厚度比及Western blot检测相关蛋白表达水平。结果大鼠颈动脉球囊损伤后6周,损伤段血管内膜明显增厚,模型组和川芎嗪组与假手术组比较,内膜/中膜面积比显著增加（P＜0.05）;与模型组比较,川芎嗪组内膜/中膜面积比下降（P＜0.05）。模型组损伤段血管Wnt 4、Dvl-1、β- catenin、Cyclin- D1表达表达水平较假手术组显著增高,而川芎嗪组的表达明显减少（均P＜0.05）。结论川芎嗪可以抑制大鼠颈动脉球囊损伤后再狭窄,其机制与下调Wnt信号通路有关。     

pcDNA3.1/hVEGF165的构建及其在COS-7细胞中的表达

目的　克隆人血管内皮生长因子基因VEGF165片段,构建pcDNA3·1 /hVEGF165,观察其在COS 7细胞中的表达,为基因治疗缺血性心脏病奠定基础。方法　从胎儿心肌组织中提取总RNA,应用RT PCR方法获得hVEGF165基因,将其重组入T载体,PCR法鉴定并测序,双酶切后克隆入真核表达载体pcDNA3 1 /myc his B中,构建pcDNA3 1 /hVEGF165重组体。用脂质体介导将其转染COS 7细胞,WesternBlotting方法检测rhVEGF165的表达蛋白。结果　RT PCR方法从胎儿心肌组织获得正确的hVEGF165基因序列,成功构建pcDNA3·1 /hVEGF165且实现转染COS 7细胞的瞬时表达。结论　该实验构建的pcDNA3· 1 /hVEGF165转染真核细胞COS 7能够表达rhVEGF蛋白。     

腺病毒介导的血管内皮生长因子体外转染心肌细胞的研究

目的:构建携带人血管内皮生长因子(VEGF)基因的重组腺病毒载体,并转染体外培养的心肌细胞,检测VEGF的表达.方法:将人源性的VEGF165cDNA正向插入到腺病毒载体PDC315,构建重组质粒,通过脂质体共转染293细胞,经同源重组获得携带人VEGF165基因的重组腺病毒,通过PCR扩增法鉴定所构建的腺病毒,扩增并测定滴度后,体外转染培养的心肌细胞,利用ELISA、Western印迹分析等方法检测VEGF在心肌细胞中的表达.结果:人VEGF165cDNA成功地正向插入到PDC315载体中,以重组病毒基因组DNA为模板,同时扩增出了610bp的VEGF165cDNA基因片段,证实了所构建病毒的正确性,病毒滴度为2.8×108 pfu/ml,Ad VEGF165体外转染心肌细胞3 d后,在培养细胞的上清液及细胞内检测到了VEGF的表达.结论:成功构建了表达人VEGF 165基因的腺病毒载体,体外转染心肌细胞后能够满意表达VEGF,为基因治疗心肌缺血奠定基础.