重组腺病毒血管内皮生长因子165基因心包腔与冠状动脉转染猪心肌效果比较

目的:比较经心包腔与冠状动脉转染重组腺病毒血管内皮生长因子165(Ad-VEGF165)基因的效果.方法:20头小型猪随机等分为心包转染组和冠状动脉转染组,2组均采用球囊堵塞前降支第一对角支远端,心包组心肌梗死模型建立后即刻,采用经皮剑突下穿刺中心静脉导管心包腔内转染,胶原酶和透明质酸酶预先处理心包,然后注射Ad-VEGF165 1.0 ml(2.0×109pfu);冠状动脉组心肌梗死模型建立后即刻,经冠状动脉注射Ad-VEGF1651.0 ml(2.0×109pfu),于注射后3 d、7 d、28 d分别测定2组心肌组织内VEGF水平、微血管密度、心功能.结果:心包转染组和冠状动脉转染组的心肌组织均表达有VEGF165基因,组织内VEGF水平在7 d时达高峰,28 d时降至基线水平,心包转染组高于冠状动脉转染组((702±85)ng/Lvs(592±59)ng/L,P=0.026).2组微血管密度随转染时间增加,心包转染组心功能优于冠状动脉转染组(FS/%:32.9±2.2vs 30.6±2.1,P=0.049;EF/%:72.11±5.20vs65.87±2.16,P=0.034).结论:导管介导的心包腔与冠状动脉转染Ad-VEGF165基因治疗心肌缺血是有效、切实可行的,而前者可能是更有前途的新方法.     

心包腔内注入腺病毒-血管内皮生长因子165基因治疗心肌缺血的实验研究

目的:探讨经心包腔途径转染血管新生基因对缺血心肌的血管生成及舒缩功能的影响。方法:第一部分:随机将12头中国小型猪分为实验组和对照组,每组6头。两组猪均采用球囊堵塞前降支第一对角支远端以建立心肌梗死模型,心肌梗死模型建立后即刻,采用经皮剑突下穿刺方法,将中心静脉导管插入心包腔内转染Ad-LacZ。以胶原酶1200 u及透明质酸酶3000u预处理心包后,在心包腔内注射含Ad-LacZ基因2.0×109pfu。对照组心包腔内注射生理盐水。分别于注射后3天、7天及28天处死动物,对缺血心肌进行染色及病理观察。第二部分:随机将20头中国小型猪分为实验组和对照组,每组10头,每组又分3天(n=2)、7天(n=6)及28天(n=6)三个亚组。注射后3天、7天及28天分别用免疫组化、超声心动图对缺血心肌血管新生情况进行检测,并以酶联免疫吸附试验(ELISA)检测血浆、心包及心肌组织中Ad-VEGF165的表达。第三部分:20头小型猪随机分为心包转染组(心包组)和冠脉转染组(冠脉组)。心包组和冠脉组均注射Ad-VEGF1651.0 ml(2×109pfu),于注射前及其后3、7、28天分别测定组织内VEGF水平、微血管密度(MVD)、心功能。结果:①实验组注射Ad-LacZ基因后第3天、第7天及28天后X-gal染色有阳性细胞,以第7天最明显,对照组无阳性细胞。②Ad-VEGF165基因经心包腔转染缺血心肌组织后,在心包及组织中成高表达,于7天达到高峰,28天降至基线水平,血浆中无目的基因的表达;28天时,实验组缺血心肌微血管密度(MVD)、心功能均明显高于对照组[MVD,517.0±75.7/mm2vs 226.5±54.1/mm2,P=0.009;LVEF72.11±5.2%vs 55.14±4.37%,P=0.005]。③心包组和冠脉组的心脏均表达有VEGF165基因,组织内VEGF水平在7天时达高峰,28天时降至基线水平,前组高于后组(702±85pg/ml vs 592±59 pg/ml,P=0.026)。而两组的MVD、心功能随转染时间延长均明显增加,但心包组优于冠脉组(28d,MVD,517.0±75.7/mm2vs 326.4±24.1/mm2,P=0.001;FS,32.9±2.2%vs 30.6±2.1%,P=0.049;LVEF,72.11±5.2%vs 65.87±2.16%,P=0.034)。结论:①应用球囊堵塞法可成功建立猪急性心肌梗死模型,胶原酶及透明质酸酶预处理心包后,腺病毒载体可转染缺血心肌,并持续表达4周。②用胶原酶及透明质酸酶预处理心包腔后,经其转染Ad-VEGF165可以诱导急性心肌梗死模型局部VEGF蛋白表达,促进缺血心肌组织血管新生并能改善心功能。③导管介导的心包腔与冠脉转染Ad-VEGF165基因治疗心肌缺血是有效的、切实可行的,而前者可能是更有前途的新方法。     

复制缺陷的重组腺病毒经心包腔转染急性心肌梗死猪观察

目的:评价重组腺病毒经心包腔转染的效率及持续时间.方法:应用磷酸钙沉淀方法制备携带大肠杆菌LacZ基因复制缺陷的重组腺病毒(Ad-LacZ).12头中国小型猪随机等分为实验组和对照组,采用球囊堵塞前降支第一对角支远端,心肌梗死模型建立后即刻采用经皮剑突下穿刺中心静脉导管心包腔内注射转染,28 d后处死.实验组胶原酶1 200 u及透明质酸酶3 000 u预处理心包后,在心包腔内注射Ad-LacZ基因2.0×109噬斑集落形成单位;对照组:同样方法预处理心包后,在心包腔内注射生理盐水1 ml.于注射后3 d、7 d及28 d分别对缺血心肌进行HE、HBFP及X-gal染色.结果:冠状动脉造影证实前降支远端完全闭塞,病理学检查显示心肌有缺血和梗死.实验组注射Ad-LacZ基因后第3 d、7 d及28 d后X-gal染色有阳性细胞,以7 d最明显,对照组28 d内均未发现阳性细胞.结论:应用球囊堵塞法可成功建立猪急性心肌梗死模型,胶原酶及透明质酸酶预处理心包后,腺病毒载体可转染缺血心肌,并持续表达4周.     

血管内皮生长因子基因重组腺病毒载体的构建

目的 :构建携带人血管内皮生长因子基因的重组腺病毒载体。方法 :将人源性的 VEGF1 6 5c DNA正向插入到穿梭质粒 p HCMVSP1A的 CMV启动子之下 ,构建重组质粒 ,通过脂质体与 p JM17共转染 2 93细胞 ,经同源重组获得携带人 VEGF1 6 5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、纯化并测定滴度。结果 :人VEGF1 6 5c DNA成功地正向插入到 p HCMVSP1A载体中 ,以重组病毒基因组 DNA为模板 ,同时扩增出 5 76 bp的VEGF1 6 5c DNA基因片段和 86 0 bp的腺病毒骨架基因片段 ,证实了所构建病毒的正确性 ,病毒滴度为 2 .5× 10 9pfu/ m l。结论 :成功构建了表达人 VEGF1 6 5基因重组腺病毒载体 ,使 VEGF基因的高效转染成为可能     

人血管内皮细胞生长因子165基因转染大鼠内皮祖细胞的实验研究

目的探讨人血管内皮细胞生长因子165（hVEGF165）基因转染骨髓源性内皮祖细胞（EPCs）及对其影响。方法体外分离、培养、鉴定大鼠骨髓EPCs,ELISA检测转基因EPCs表达VEGF蛋白,MTT法检测对其增殖的影响。结果FITC-UEA-I和DiI-ac-LDL荧光双染证实分化的EPCs,脂质体介导pcDNA3-hVEGF165质粒转染组EPCs培养基上清中表达VEGF,hVEGF165基因转染促进EPCs增殖,注射转基因EPCs的大鼠皮下局部血管增加。结论hVEGF165基因可成功转染EPCs,并且具有血管内皮增殖刺激活性,为进一步研究hVEGF165基因修饰EPCs治疗血管内膜损伤性疾病提供实验依据。     

转染血管内皮生长因子基因对大鼠任意皮瓣成活的影响

OBJECTIVE: To investigate the effects of vascular endothelial growth factor (VEGF) gene transfection on survival of the random skin flap in rats. METHOD: Thirty SD rats were randomized equally into 3 groups: pcDNA3-VEGF165, pcDNA3 and control groups, with the former two groups transfected via liposome with pcDNA3-VEGF165 and pcDNA3 respectively 48 h before and during the operation. Ischemic random skin flaps ( 1 cmx7 cm) were constructed from the rats. Seven days later, the amount of viable tissue within the flap was measured by planimetry. After the animals were killed, and specimens from the random skin flaps were harvested for immunohistologic evidence of VEGF protein expression and for HE staining to examine the microvascular growth. RESULTS: The results of tissue survival planimetry of the skin flap of pcDNA3-VEGF165, pcDNA3 and control groups were 48.46% +/-3.35%, 30.20%+/-2.16%, and 31.35% +/-1.99%, which were highest in the VEGF- transfected group (P<0.05), in which immunohistochemical staining revealed increased deposition of VEGF in comparison with the other control groups P<0.05 . The VEGF group had also higher average vessel number as compared with the vector and control group (107.72+/-9.42 vs 91.35+/-7.28 and 89.85+/-7.66, P<0.05), and smaller average vessel lumen diameter (25.76+/-3.23 microm vs 32.12+/-1.58 microm and 33.49+/-2.29 microm, P<0.05). CONCLUSION: pcDNA3-VEGF165 transfection may enhance the survival of the ischemic skin flaps and achieve VEGF expression in the flaps in rats.     

血管内皮生长因子基因转染对放疗后组织血管生成的影响

目的：研究血管内皮生长因子基因转染对放疗后损伤区组织血管生成的影响。方法：用重组质粒pcDNA3／VEGF165转染大鼠右后肢照射区肌肉组织细胞,每次每只大鼠转染质粒200μg,共治疗2次,间隔2周,治疗结束后行VEGF蛋白检测、血管染色体视学图像分析、血管超微结构观察以及血管造影等。结果：经重组质粒pcDNA3／VEGF165基因转染后,照射区组织VEGF蛋白明显增高,微血管密度、平均截面积、平均管径和血管造影计数均达到正常组织水平,血管超微结构基本恢复正常。结论：VEGF基因转染治疗可逆转放疗对大鼠组织血管造成的损伤,有效地恢复血管生成能力。     

血管内皮生长因子基因体外转染人脐静脉内皮细胞的实验研究

观察血管内皮生长因子（vascular endothelial growth factor,VEGF)基因转染对人脐静脉内皮细胞的生物学作用,探讨其在人工血管抗血栓形成中应用的可行性。将真核表达质粒pCD－hVEGF165体外转染人脐静脉内皮细胞。原位杂交、免疫组化及ELISA法检测VEGF基因的表达并描绘内皮细胞生长曲线。结果发现：VEGF基因转染能明显促进内皮细胞的分裂增殖。提示VEGF基因有可能作为增强人工血管抗血栓能力的有效候选基因。     

转染血管内皮生长因子基因对大鼠任意皮瓣成活的影响

目的 探讨血管内皮生长因子(vascular endothelial growth factor,VEGF)基因对体内转染皮瓣成活的影响。方法 将30只SD大鼠随机均分为pcDNA₃-VEGF₁₆₅组、pcDNA₃组(两组均为术前48h、术中两次转染)和生理盐水(对照)组,术后7d计算各组大鼠皮瓣的成活面积。对皮肤标本行病理观察,免疫组化染色检测VEGF表达情况。结果 三组大鼠术后皮瓣平均成活率分别为48.46+3.35%、30.20±2.16%、31.35±1.99%,pcDNA₃-VEGF₁₆₅组显著高于其余两组(P<0.05);免疫组化染色示pcDNA₃-VEGF₁₆₅组染色深度亦显著深于其余两组(P<0.05)。结论 转染pcDNA₃-VEGF₁₆₅能够改善任意皮瓣的成活率,并显著表达VEGF₁₆₅。     

腺病毒介导的反义血管内皮生长因子基因转染治疗胰腺癌的实验研究

目的：构建并鉴定反向插入VEGF165cDNA的重组腺病毒,探讨腺病毒介导的VEGF165反义核酸治疗胰腺癌的可行性。方法：应用基因重组技术，将513bp的人VEGF165cDNA反向克隆入腺病毒粘粒载体pAxCAwt。重组粘粒与腺病毒DNA－TPC混合后以磷酸钙共沉淀法转染293细胞制备重组腺病毒。建立胰腺癌裸鼠皮下种植瘤模型，瘤体内直接注射重组腺病毒，观察肿瘤的生长及血管生长情况。结果：成功构建了反向插入VEGF165cDNA的腺病毒粘粒载体pAxCAwt-αVEGF并制备出高滴度的重组腺病毒。实验第5周时肿瘤生长速度Ad-αVEGF治疗组比PBS和Ad-LacZ对照组均明显减慢（P＜0．01）；肿瘤微血管密度Pd-αVEGF治疗组比两个对照组均明显减少（P＜0．01）。结论：腺病毒介导的VEGF165反义核酸可以抑制胰腺癌的血管生成和肿瘤的生长，为抗血管生成的基因治疗提供了实验依据。     

腺病毒介导的血管内皮生长因子165对兔外周血管生成作用的研究

目的：检验以腺病毒为载体的 血管内皮生长因子165（Ad-VEGF165)基因的表达规律及能否促进缺血骨骼肌血管生成。方法：将兔右股动脉离断后,在缺血肌肉组织中直接注入Ad-VEGF165或磷酸盐缓冲液（PBS）,5周后,以血管造影、免疫组化检查及单光子发射计算机断层（SPECT）显像检测局部缺血组织血管新生情况。用酶联免疫分析法（ELISA）检测血浆和肌肉组织中Ad-VEGF165的表达。结果：Ad-VEGF165注入缺血肌肉组织后24h达到表达高峰,1周时降至基线水平,血浆及对侧健康的肌肉组织中无目的基因表达,治疗缺血肢体侧枝血管（P＜0．01）、血管密度（P＜0．05）及相对血流（P＜0．01）均明显高于对照组。结论：缺血肌肉组织中直接注入Ad-VEGF165可诱导局部VEGF蛋白表达,促进缺血部位的血管生成,增加血流量。     

人血管内皮细胞生长因子165基因真核表达载体的构建及其在大肠杆菌的表达

目的　获得人血管内皮生长因子 (hVEGF165)cDNA ,构建真核表达载体 ,并研究其在大肠杆菌中的表达情况。方法　采用PCR方法 ,从HL6 0细胞中扩增出hVEGF165cDNA ,将其克隆至 pcDNA3 真核表达载体上 ,构建成为 pCD hVEGF165重组质粒。将重组质粒转染感受态的大肠杆菌BL2 1(DE3)中进行表达 ,用Westernblot检测表达产物。结果　经酶切鉴定及基因测序证实hVEGF165cDNA基因克隆成功 ,并建立了高效表达的 pCD hVEGF165重组质粒。Westernblot检测表明 ,组建了具有高效表达hVEGF165的大肠杆菌菌株。结论　成功地克隆和表达出了hVEGF165基因 ,为进一步建立VEGF转基因动物模型 ,研究其在视网膜新生血管性疾病中的应用奠定了基础     

血管内皮生长因子反义RNA抑制人喉鳞癌的生长

目的　观察血管内皮生长因子1 6 5反义 RNA对人喉鳞癌细胞 Hep- 2的作用 ,探讨其治疗喉癌的可行性 .方法　采用亚克隆技术 ,构建并鉴定反义 VEGF1 6 5真核表达载体 ;重组质粒转染人喉鳞癌细胞 Hep- 2后 ,将其接种于裸鼠皮下 ,利用原位杂交、EL ISA、激光共聚焦、图像分析及微血管计数等方法 ,观察转染前后 Hep- 2细胞的生物学性状和致瘤性的改变 .结果　构建的 VEGF1 6 5反义真核表达载体在 Hep- 2细胞中获得表达 ,转染后的细胞 VEGF1 6 5的表达下降 70 % ,其生物学性状不受外源基因表达的影响 ,但其在裸鼠皮下的致瘤性和血管生成能力明显下降 ,实验组、空载体组和对照组肿瘤体积分别为 (736± 2 6 2 ) ,(74 4 0± 335 )和 (772 0± 35 0 ) mm3(P<0 .0 1) ,微血管密度分别为 (9.6± 5 .4 ) ,(45 .5± 8.4 )和 (48.4± 7.6 ) mm- 2 (P<0 .0 1) .结论　 VEGF1 6 5反义 RNA能够显著减少喉癌细胞内 VEGF1 6 5的表达 ,具有抑制肿瘤生长和血管生成的作用 ,有望成为抗喉癌的新基因治疗手段 .     

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.     

Intrastriatal Gene Transfer of Vascular Endothelial Growth Factor Rescues Dopaminergic Neurons in a Rat Parkinson＇s Disease Model

To examine the ability of intrastriatal gene transfer of vascular endothelial growth factor 165 mediated by adenoviral vector to rescue dopaminergic neurons in a rat model of Parkinson＇s disease （PD）, we constructed recombinant replication-deficent adenoviral vectors carrying the gene of VEGF165 （Ad-VEGF）, and injected Ad-VEGF （or Ad-LacZ and PBS as controls） into the striatum of rats 7 days after the lesion by 6-hydroxydopamine. The rat rotational behavior analysis and tyrosine hydroxylase （TH） immunohistochemistry were performed to assess the change of dopaminergic neurons. Our results showed that the rats receiving Ad-VEGF injection displayed a significant improvement in apomorphine-induced rotational behavior and a significant preservation of TH-positive neurons and fibers compared with control animals, It is concluded that intrastriatal gene transfer by Ad-VEGF may rescue the dopaminergic neurons from degeneration in a rat model of PD.     

血管内皮生长因子促血管形成作用及其调控

血管内皮生长因子是一种具有促血管生成活性的功能性蛋白,它通过与特异性受体的结合,发挥生理功能:(1)促血管内皮细胞分裂从而促进新生血管形成;(2)增强血管通透性的功能.其活性的发挥受到多因素、多水平的调节,如:缺氧、癌基因、细胞因子、细胞间质成分等.本文从血管内皮生长因子的促血管形成机制及其调控因素等方面对其生物学行为和特性作一综述.     

Effect of Antisense Oligodeoxynucleotide of Vascular Endothelial Growth Factor C on Lymphangiogenesis and Angiogenesis of Pancreatic Cancer

In order to investigate the effect of antisense oligonucleotide (ASODN) of vascular en-dothelial growth factor C (VEGF-C) on lymphangiogenesis and angiogenesis of pancreatic cancer, antisense and scamble-sense oligonucleotide of VEGF-C were constructed, and the model of nude mice with orthotopically xenografted human pancreatic cancer cells (Panc-1) was established. Thirty nude mice were randomly divided into 3 groups: PBS control group (group A), scramble-sense con-trol group (group B) and antisense group (group C). All nude mice were treated once every 2 days as 3 times per week, for 3 weeks (oligonucleotide 10 mg/kg every time). After treatments were com-pleted, ELISA method was used to examine the concentration of VEGF-C in plasma and immunohis-tochemical method to examine microvessel density (MVD), lymphtic vessel density (LVD) of pan-creatic cancer. The results showed that the expression of VEGF-C was inhibited significantly in group C. The concentrations were 237.5±41.5, 221.5±52.3 and 108.6±14.9 pg/mL in groups A, B and C re-spectively (P<0.01). LVD in groups A, B and C was 13.8±2.1, 12.4±1.9 and 4.2±1.6 respectively (P<0.01). MVD in groups A, B and C was 27.5±8.7, 25.9±4.2 and 19.4±5.6 respectively with no sig-nificant difference among the groups (P>0.05). It was suggested that VEGF-C ASODN decreased the expression levels of VEGF-C in nude mice with orthotopically xenografted human pancreatic cancer, and it could inhibit lymphangiogenesis, but had no significant effect on angiogenesis.     

大鼠颌下腺血管内皮生长因子cDNA的转移及表达

目的：探讨以颌下腺为靶器官,进行血管内皮生长因子（ＶＥＧＦ）基因治疗后,颌下腺中ＶＥＧＦ含量变化。方法：构建了ＶＥＧＦ基因表达的真核细胞表达载体,以阳离子脂质体为介质,向大鼠颌下腺转染外源性的ＶＥＧＦ基因,应用ＲＴ－ＰＣＲ技术观察ＶＥＧＦ基因的表达,ＥＬＩＳＡ方法检测颌下腺中ＶＥＧＦ的含量变化。结果：转ｐＢＫＣＭＶ－ＶＥＧＦ１２１基因后第１天,大鼠颌下腺内ＶＥＧＦ的表达及涎液中ＶＥＧＦ的含量即开始