VEGF165转染内皮祖细胞移植对大鼠肾脏缺血再灌注的保护作用

目的：评估VEGF165基因转染的内源性内皮祖细胞（endothelial progenitor cells,EPCs）移植治疗肾脏缺血再灌注损伤（ischemia?reperfusion injury,IRI）的作用,进一步阐明EPCs对肾脏IRI产生保护作用的旁分泌机制。方法：40只成年雄性SD大鼠被随机分成4组,其中包括假手术组、缺血再灌注组、EPC移植组、携带VEGF165基因转染组。利用重组腺病毒载体Ad?VEGF165感染EPCs,并进行转染效率鉴定。并进一步移植治疗大鼠肾脏IRI,术后24 h和72 h分别评估血清肌酐及尿素氮水平;组织病理学检查评估各组大鼠术后肾损伤程度;免疫组化染色评估CD31表达情况;Western blot检测大鼠肾脏IRI中血管内皮生长因子（vascular endothelial growth factor,VEGF）、血管生成素?1（Ang?1）及血管生成素?2（Ang?2）表达情况。结果：研究发现利用重组腺病毒载体Ad?VEGF165转染的EPCs移植治疗后,大鼠肾脏血清肌酐、尿素氮水平和肾脏组织病理学明显改善,术后72 h检测大鼠患肾,其CD31、VEGF、Ang?1以及Ang?2表达水平均明显提升。结论：VEGF165基因转染的EPCs移植治疗可以有效治疗大鼠肾脏IRI,其作用机制可能与EPCs归巢后旁分泌过量VEGF并进一步促进Ang?1、Ang?2等血管新生因子表达,从而促使肾脏血管新生有关。     

EPCs移植对缺血再灌注肾损伤大鼠血管内皮生长因子的影响

目的:探讨EPCs移植对缺血再灌注肾损伤大鼠血管内皮生长因子(VEGF)表达的影响。方法:雄性SD大鼠22头,随机分为3组:对照组、I/R组、EPCs组,术后1d处死各组大鼠,抽取外周血培养及鉴定内皮祖细胞,抽血检测大鼠的生化指标,采用RT-PCR技术测定三组大鼠VEGF mRNA的表达情况,行病理染色观察各组大鼠肾间质血管CD34的表达情况。结果:EPCs移植上调缺血再灌注大鼠VEGF mRNA的表达并改善了该组大鼠的肾功能,减轻了肾间质血管内皮细胞的损伤。结论:EPCs移植减轻大鼠缺血再灌注肾损伤可能与上调VEGF的表达有关。     

人VEGF 165基因转染大鼠内皮祖细胞及对其增殖的影响

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EPCs增殖的影响。方法体外分离、培养、鉴定EPCs,脂质体介导pcDNA3-hVEGF165质粒转染组、pcDNA3空质粒转染组、空白对照组。ELISA检测EPCs表达VEGF蛋白,MTT法检测hVEGF165基因修饰对EPCs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。结论EPCs可以成功转染hVEGF165基因,并且可促进EPCs的增殖,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。     

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。     

pcDNA3.1(+)/VEGF165质粒转染骨髓内皮祖细胞后VEGF165的表达

目的:培养和鉴定大鼠内皮祖细胞(Endothelial progenitor cells,EPCs),观察pcDNA3.1(+)/VEGF165质粒转染大鼠骨髓内皮祖细胞后内皮细胞生长因子165(Vascular endot-helial growth fator-165,VEGF165)的表达.方法:体外培养内皮祖细胞,以免疫细胞化学法检测其表面抗原(CD34、CD133、KDR)的表达.通过pcDNA3.1(+)质粒转染VEGF165后,采用酶联免疫吸附法(ELISA)检测内皮祖细胞培养上清液中VEGF蛋白的水平,反转录聚合酶链反应(RT-PCR)检测内皮祖细胞中VEGF165mRNA的表达.结果:免疫细胞化学检测表明培养的细胞为大鼠内皮祖细胞,PCR后凝胶电泳显示pcDNA3.1(+)/VEGF165质粒转染组在576 bp处可见有明显条带,pcDNA3.1(+)空质粒转染组和未转染组可见微弱的电泳带位于500 bp与600 bp之间,约576bp大小.ELISA检测结果为pcDNA3.1(+)/VEGF165质粒转染组上清液中VEGF165水平为(175.8±10.7)pg/ml,pcDNA3.1(+)空质粒组为(10.5±1.6)pg/ml,未转染组为(9.3±1.3)pg/ml.结论:内皮祖细胞体外培养有微量VEGF165表达,应用pcDNA3.1(+)/VEGF165载体转染,可使SD大鼠内皮祖细胞高效表达VEGF165.     

小肠RNA对缺血再灌注条件下移植小型猪骨髓内皮祖细胞的体外干预效应观察

目的 观察小肠RNA对小型猪骨髓内皮祖细胞(EPCs)生长的影响及适宜浓度,以及小肠RNA对缺血再灌注条件下移植EPCs的干预效应.方法 通过Ficoll方法分离,差速贴壁纯化,诱导生成猪EPCs,分离提纯大鼠小肠RNA.设立不同浓度RNA组,观察其对EPCs生长增生等细胞功能的影响;依据适宜浓度,设立小肠RNA预处理组、缺血再灌注后加小肠RNA组、单纯小肠RNA孵育组、单纯缺血再灌注组和正常对照组,观察细胞生长曲线和LDH变化,还原酶法测量NO、NOS,观察EPCs的分泌功能.应用流式细胞仪观察EPCs凋亡情况,Western Blotting观察EPCs表面Flk-1的表达差异.结果 小肠RNA在20μg/ml左右浓度促EPCs增生作用最明显;小肠RNA预处理组EPCs的Flk-1水平上调,EPCs凋亡较少,LDH和iNOS生成明显低于单纯缺血再灌注组和缺血再灌注后添加小肠RNA组,但高于正常对照组和单纯小肠RNA处理组.结论 适宜浓度的小肠RNA可以促进EPCs的增生;小肠RNA预处理可以通过上调EPCs表面Flk-1水平,减少凋亡和分泌不利因子等机制增强EPCs抵抗缺血再灌注后移植的微环境改变的不利影响.     

人VEGF165基因转染兔骨髓内皮祖细胞及对其增殖的影响

目的 探讨人血管内皮生长因子165(hVEGF165)基因转染兔骨髓源性内皮祖细胞(EPCs)及对EPCs增殖的影响.方法 体外分离、培养、扩增并鉴定EPCs,脂质体介导转染携带增强型绿色荧光蛋白标记的VEGF165质粒、空白质粒,同时经ELISA法检测转基因EPCs表达VEGF蛋白,并采用CCK-8法检测对其增殖的影响.结果 FITC标记荆豆凝集素Ⅰ和Dil标记的乙酰化低密度脂蛋白荧光双染证实正在分化的EPCs,同时经免疫组化法证实VEGF受体2 FLk-1和Ⅷ因子的表达;VEGF165质粒转染组EPCs上清液中表达VEGF165,VEGF165转染EPCs的转染率约22.5%;hVEGF165基因转染促进EPCs增殖.结论 hVEGF165基因可成功转染EPCs,且可促进EPCs的增殖,为基因治疗血管性疾病提供了动物实验基础.     

脂质体介导的VEGF质粒肝脏内注射对肝缺血再灌注损伤的保护作用

目的 探讨肝脏内注射脂质体包裹的血管内皮生长因子(VEGF)表达质粒对肝缺血再灌注损伤的影响及可能的作用机制.方法 实验兔随机分为假手术组、肝缺血再灌注组、重组VEGF治疗组(缺血前20 min经门静脉肝脏内注射脂质体包裹的VEGF表达质粒),制作肝缺血再灌注损伤模型,分别于术毕、术后2、6、12、24 h共5个时间点检测肝功能及血浆超氧化物歧化酶(SOD)活性、黄嘌呤氧化酶(XO)活性.于术毕6 h取各组部分动物肝组织,以RT-PCR技术检测肝组织Fas mRNA水平,以流式细胞仪检测细胞凋亡率.于术毕24 h处死动物,取缺血部分肝组织,制备病理切片,在光镜及电镜下观察细胞结构的变化.结果 肝缺血再灌注复流后6 h,血清谷丙转氨酶(ALT)升高至峰值,其后呈下降趋势,于术毕6、12、24 h,肝缺血再灌注组ALT值显著高于重组VEGF治疗组,差异均有显著性意义(均P<0.05).肝缺血再灌注组SOD呈下降趋势,XO呈上升趋势,重组VEGF治疗组于术毕6 h以后SOD呈上升趋势,XO呈下降趋势,与肝缺血再灌注组比较差异均具有显著性意义(P<0.05或P<0.01).重组VEGF治疗组的Fas mRNA水平及肝细胞凋亡率均显著低于肝缺血再灌注组(均P<0.01),光镜及电镜下观察,重组VEGF治疗组的肝细胞损伤亦较肝缺血再灌注组明显减轻.结论 肝缺血前肝组织内预注射脂质体包裹的含有VEGF基因的质粒对肝细胞具有明显的保护作用,其作用机制是通过提高肝细胞的抗氧化能力,从而下调Fas mRNA的表达,抑制肝细胞的凋亡来实现的.     

hHGF基因肾脏电转染对大鼠肾缺血再灌注损伤的保护作用

目的: 使用肾脏直接基因电转染方法对大鼠肾脏进行hHGF基因转染,观察该基因转染对肾脏缺血再灌注损伤的保护作用. 方法: 雄性SD大鼠20只,随机分为转染组和对照组,每组10只. 在热缺血前3 d将含有hHGF基因的质粒用电转染方法转入大鼠肾脏,3 d后建立大鼠肾热缺血模型,观察hHGF的药代动力学,并对缺血肾脏进行功能和组织学评价. 结果: hHGF基因电转染组肾组织及血浆hHGF基因表达水平高于对照组(P＜0.01). 转染组血肌酐水平低于对照组(P＜0.01),肾功能恢复快于对照组. 组织学评价显示,转染组肾小管细胞凋亡评分低于对照组(P＜0.05). 转染组淋巴细胞、巨噬细胞及中性粒细胞浸润均较对照组少. 结论: 肾脏hHGF基因电转染组hHGF药代动力学和治疗效果均显示,该基因电转染对肾脏缺血再灌注损伤有保护作用.     

外源性血管内皮生长因子对大鼠肝缺血再灌注损伤的影响

目的:研究外源性血管内皮生长因子(vascular endothelial growth factor,VEGF)对大鼠肝缺血再灌注损伤的影响?方法:雄性SD大鼠30只,体重(300±20)g,随机分为A组(VEGF组)?B组(缺血再灌注组)?C组(手术对照组),其中A?B组建立70%肝缺血再灌注损伤模型?A组于缺血前30 min经腹腔注射VEGF(50 μg/300 g体重);B组于缺血前30 min 经腹腔注射等量生理盐水;C组仅麻醉?开腹,不阻断血流?术后6 h,分别采用全自动生化分析仪?HE染色?ELISA法?比色法分别测定血肝功能酶?肝组织病理改变?肝脏诱导型一氧化氮合成酶(induced nitric oxide synthase,iNOS)活性?肝组织髓过氧化物酶(myeloperoxidase,MPO)的含量?结果:A组应用重组VEGF后血肝功能酶以及肝组织MPO显著低于B组(P < 0.01),肝脏局部iNOS的活性降低,肝组织形态学无明显改变?结论:外源性VEGF能抑制肝脏iNOS的活性,缓解肝功能下降,保护大鼠肝脏缺血再灌注损伤?     

内皮祖细胞在早期急性肾缺血再灌注损伤中的抗凋亡作用观察

目的:观察内皮祖细胞(EPC)移植对急性肾缺血再灌注损伤(IRI)早期的治疗作用及其对肾小管上皮细胞凋亡的影响,探讨其可能的肾脏保护机制.方法:大鼠骨髓单个核细胞体外定向诱导、扩增获取EPC并标记.SD大鼠随机分为3组:移植组进行急性肾缺血再灌注操作后行EPC移植;IRI组缺血再灌注后注入等量生理盐水;假手术组假手术后注入EPC.检测IRI后24、48 h 3组大鼠的肾功能,观察IRI后72 h 3组大鼠肾组织损伤、肾小管上皮细胞凋亡、EPC在肾组织中的归巢情况.结果:肾IRI后72 h,移植组肾脏皮髓交界处内可见少量CM-Dil阳性细胞.移植组大鼠较对照组肾功能明显改善(P<0.05),肾损伤明显减轻(P<0.01),肾小管上皮细胞凋亡明显减少(P<0.01),血管内皮生长因子(VEGF)表达水平显著升高(P<0.05).结论:骨髓源性EPC移植对急性肾IRI有治疗作用,其可能机制是通过减少肾小管上皮细胞凋亡来减轻IRI早期的肾损害.     

血管内皮生长因子基因修饰内皮祖细胞对内膜损伤血管修复的影响

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EPCs增殖的影响,在体研究VEGF基因修饰EPCs对内膜损伤血管再内皮化的影响.方法 体外分离、培养、鉴定EPCs,脂质体介导pcDNA3-hVEGF165质粒转染组、pcDNA3空质粒转染组、空白对照组.ELISA法检测EPCs表达VEGF蛋白,MTT法检测hVEGF165基因修饰对EPCs增殖的影响.基因修饰EPCs移植到内膜损伤血管模型中,观察基因修饰对EPCs修复内膜损伤的效应.结果 FITC-UEA-Ⅰ和DiⅠ-acLDL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迁移、黏附和增殖.基因修饰EPCs促进损伤内膜修复.结论 EPCs可以成功转染hVEGF165基因,并且促进EPCs的迁移、黏附和增殖,增强EPCs对损伤内膜修复的能力.     

VEGF动员内源性EPCs促进MCAO/R小鼠神经功能恢复

目的观察局灶性脑缺血再灌注模型(middle cerebral artery occlusion/reperfusion,MCAO/R)小鼠外周循环中血管内皮祖细胞(endothelial progenitor cells,EPCs)的数量变化,并应用血管内皮生长因子(vascular endothelial growthfactor,VEGF)动员小鼠自体骨髓中的EPCs,观察脑梗死小鼠的神经功能恢复情况。方法以MCAO/R小鼠为研究对象,通过腹腔注射VEGF动员体内的EPCs(每日1次,持续1周),在动员过程中的第1、4、7天进行神经功能评分,然后从内眦静脉采血,使用流式细胞仪检测MCAO/R组及MCAO/R+VEGF组小鼠外周血中EPCs的数量;并断头取脑,对脑组织TTC染色后计算并比较小鼠脑梗死体积的变化。结果MCAO/R+VEGF组在动员过程中,外周血中的EPCs在给药第1天开始增加,第4天达到高峰并持续到第7天;并且在这3个时间点上,MCAO/R+VEGF组与其他两组比较均具有统计学意义(P<0.01)。神经功能评分:MCAO/R+VEGF组在动员后神经功能评分值持续降低,且该组在给药第4天及第7...     

Transplantation of VEGF165-gene-transfected endothelial progenitor cells

Background: To study the cotherapeutic effect of stem cell transplantation and gene transfection on chronic venous thrombosis. Methods: We constructed a recombinant adenoviral vector carrying the VEGF165 gene by using the pAdEasy system, which was subsequently identified and amplified. Simultaneously, endothelial progenitor cells (EPCs) were isolated from rat bone marrow by using Ficoll, cultured in EBM-2MV medium, and identified. Then, the cells were transfected with the recombinant Ad-VEGF165. The EPCs were labeled with 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine (Dil) before transplantation. An experimental rat model of chronic vein thrombosis was developed by partial ligation of the inferior vena cava. The rats were randomly divided into 4 groups: A (n = 25), Ad-VEGF165/EPC-transplantation group, which received 1 ml (106) of Ad-VEGF165/EPCs; B (n = 25), EPC-transplantation group, which received 1 ml (106) of EPCs; C (n = 25), Ad/EPC-transplantation group, which received 1 ml (106) of Ad/EPCs; D (n = 25), control group, which received 1 ml of the transplantation medium. The thrombi and adjacent caval walls were harvested 28 days after transplantation; real-time quantitative polymerase chain reaction (PCR) was used to detect the expression level of VEGF mRNA; and western blotting was used to measure thrombosis and changes in VEGF protein expression. Hematoxylin-eosin (HE) staining and immunohistochemical staining were performed to detect recanalization, and neovascularization was observed by scanning electron microscopy. The capillary density was quantitatively determined by counting the capillaries under a high-power microscope. SPSS 11.5 software used for analysis, and differences at P < 0.05 were considered to be significant. Results: The Ad-VEGF165 was constructed, and bone-marrow-derived EPCs were cultivated and successfully identified. We determined the optimum transfection ratio that promoted the growth of EPCs. After transfection, the EPCs secreted the VEGF protein. After transplantation, the in vivo survival of EPCs and their differentiation into endothelial cells were determined by detecting the fluorescence associated with the Dil stain. VEGF mRNA was expressed in groups A, B, C, and D after transplantation, and the VEGF mRNA level in group A was significantly higher than those in groups B, C, and D (P < 0.05); the VEGF mRNA levels in groups B and C were significantly higher than those in group D (P < 0.05), and there was no statistical significance between the VEGF mRNA levels in groups B and group C. The recanalization capillary density in group A was significantly higher than those in groups B, C (P < 0.05), and D (P < 0.01); the recanalization capillary densities in groups B and C were significantly higher than that in group D (P < 0.05). Moreover, there was no statistical significant difference between the values for groups B and C. Neovascularization was detected by immunohistochemical staining using the antibody for vWF, which is a component of endothelial cells. Conclusion: The EPCs were successfully transfected by Ad-VEGF165. A suitable transfection ratio can improve the efficiency of EPCs, improving the possibility of promotion of angiogenesis after transplantation. Transfected EPCs caused accelerated organization and recanalization of vein thrombi.     

AQP4和VEGF在大鼠视网膜缺血／再灌注损伤中表达的规律及相关性分析

目的研究水通道蛋白-4（AQP4）和血管内皮生长因子（VEGF）在视网膜缺血／再灌注（RIR）损伤机制中的表达规律,探讨二者在RIR损伤机制中有无相关性。方法运用提高眼内压的方法建立大鼠RIR模型,将56只Wistar大鼠随机分为术后6、12、24、48、72h,7d组和正常对照组,用免疫组化法、平均光密度分析和Pearson法观察二者的表达水平及相关性。结果AQP4在RIR损伤6h后出现表达上调,24h后达高峰,除7d组外,其余实验组AQP4的表达与正常对照组相比均有显著性差异fP〈0．01）。VEGF表达在RIR损伤后12h开始增加,48h达高峰,具有显著性差异（P〈0．01）。AQP4和VEGF在12-72h呈正相关,且24、48h的相关性更佳。结论AQP4和VEGF在RIR损伤中可能通过协同作用影响视网膜的水代谢。     

Transplantation of VEGF165-gene-transfected endothelial progenitor cells in the treatment of chronic venous thrombosis in rats

Background The organization and recanalization of thrombi is a dynamic and complex process. The aim of this research was to study the cotherapeutic effect of stem cell transplantation and gene transfection on chronic venous thrombosis. Methods We constructed a recombinant adenoviral vector carrying the vascular endothelial growth factor 165 （VEGF165） gene by using the pAdEasy system, which was subsequently identified and amplified. Simultaneously, endothelial progenitor cells （EPCs） were isolated from rat bone marrow using Ficoll, cultured in EBM-2MV medium, and identified. Then, the cells were transfected with the recombinant Ad-VEGF165. The EPCs were labeled with 1 ,1＇-dioctadecyl-3,3,3＇,3＇-tetramethylindocarbocyanine （Dil） before transplantation. A rat model of chronic vein thrombosis was developed by partial ligation of the inferior vena cava. The rats were randomly divided into 4 groups （n=25, each）： A, Ad-VEGF165/EPC-transplantation group received 1 ml （10^6） of Ad-VEGF165/EPCs; B, EPC-transplantation group received 1 ml （10^6） of EPCs; C, Ad/EPC-transplantation group received 1 ml （10^6） of Ad/EPCs; D, control group received 1 ml of the transplantation medium. The thrombi and adjacent caval walls were harvested 28 days after transplantation; real-time quantitative polymerase chain reaction was used to detect the expression level of vascular endothelial growth factor （VEGF） mRNA; and western blotting was used to measure changes in VEGF protein expression. Hematoxylin-eosin staining and immunohistochemical staining were performed to detect recanalization. Neovascularization was detected by immunohistochemical staining using the antibody for von Willebrand factor （vWF）, which is a component of endothelial cells.The capillary density was quantitatively determined by counting the capillaries under a high-power microscope. Results The Ad-VEGF165 was constructed, and bone-marrow-derived EPCs were cultivated and successfully identified. We determined the optimum transfection ratio that promoted the growth of EPCs. After transfection, the EPCs secreted the VEGF protein. After transplantation, the in vivo survival of EPCs and their differentiation into endothelial cells were determined by detecting the fluorescence associated with the Dil stain. VEGF mRNA was expressed in groups A, B, C and D after transplantation, and the VEGF mRNA level in group A was significantly higher than those in groups B, C and D （P〈0.05）; the VEGF mRNA levels in groups B and C were significantly higher than those in group D （P〈0.05）, and there was no statistical significance between the VEGF mRNA levels in groups B and C. The recanalization capillary density in group A was significantly higher than those in groups B, C （P 〈0.05） and D （P 〈0.01）; the recanalization capillary densities in groups B and C were significantly higher than that in group D （P 〈0.05）. Moreover, there was no statistical significant difference between the values for groups B and C. Conclusions The EPCs were successfully transfected by Ad-VEGF165. A suitable transfection ratio can improve the efficiency of EPCs and the possibility of promotion of angiogenesis after transplantation. Transfected EPCs caused accelerated organization and recanalization of vein thrombi.     

脑缺血再灌注大鼠外周血EPCs与VEGF、bFGF、eNOS水平变化及相关性

目的 探讨大鼠脑缺血再灌注后外周血内皮祖细胞(endothelial progenitor cells,EPCs)、血清血管内皮生长因子(vascular endothelial growth factor,VEGF)、碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)及内皮型一氧化氮合成酶(endothelial nitric oxide synthase,eNOS)水平变化及相关性.方法 SD大鼠随机分为正常空白对照组、假手术组、脑梗死组、糖尿病组、糖尿病假手术组和糖尿病缺血再灌注组.链脲佐菌素诱导制作糖尿病模型,线栓法制作脑缺血再灌注模型.流式细胞仪测定EPCs数量.ELISA法测定VEGF、bFGF及eNOS的数量.结果 脑梗组EPCs、VEGF、bFGF和eNOS数量较正常组及假手术组增高(P<0.01),糖尿病脑梗组EPCs较糖尿病组下降(P<0.05),而VEGF、bFGF和eNOS数量则升高(P<0.05).EPCs与VEGF和bFGF数量变化有相关性(P<0.05),与eNOS数量变化相关性无统计学意义.结论 大鼠脑缺血再灌注后外周血EPCs与VEGF和bFGF水平变化存在相关性,它们可能共同影响着缺血性脑血管病的一些病理生理过程.这种变化及相关性对于估测脑梗死患者病情程度和预后有一定的指导意义.     

VEGF在大鼠缺血再灌注损伤肝组织中的表达及其意义

目的:探讨血管内皮生长因子(vascular endothelial growth factor,VEGF)在缺血再灌注损伤肝组织中的表达及意义。方法:利用雄性SD大鼠建立部分肝血流阻断动物模型,肝血流阻断90 min后恢复血流灌注,再灌注后1,6 h处死大鼠收集标本。分别采用全自动生化分析仪、HE染色,比色法、ELISA法测定血清转氨酶(ALT,AST),肝组织病理改变,肝组织髓过氧化物酶(MPO)的活性以及VEGF蛋白的含量。结果:与假手术组相比,缺血再灌注组(I/R组)缺血肝脏MPO活性,肝组织内VEGF蛋白的含量以及ALT,AST在再灌注1 h即升高,且缺血再灌注6 h时较1 h明显升高;缺血肝脏病理切片可见大量炎症细胞浸润,6 h炎症反应更为剧烈,部分肝细胞呈点状坏死。结论:VEGF蛋白表达的上调可能参与了大鼠肝脏缺血再灌注过程中肝脏的损伤。