VEGF基因修饰兔骨髓间充质干细胞的研究
中国组织工程研究与临床康复第 2眷第 2 劳2008—03一l8出版 胁fcM Journal ofClinical Rehabilitative Tissue Engineering Research MⅡ ^18.2008 Vo1.12 No 12 Study of VEGF transfection on rabbit mesenchymal stem cells*冰☆ xu Song—bai’Zhao Gang’Zhao Hong—guang ,Xu Kan’Yu Hong—quan’Hou Yi。 ,,,,Abstract BACKGR0UND:Vascular endothelial growth factor(VEGF1 is a very effective way to make tissue engineer bone vascularization. 。Department Neurosurgery, of However,because of expensive and short half-life,VEGF cannot maintain effective concentration in blood after injection.To resolve the problem effectively,gene transfection technique is used in this experiment to transfer human VEGF into seed cells—mesenchymal stem cells(MSCs)of tissue engineer bone and to make it secrete VEGF which could vascularize bone. OBJECTIVE:To explore the possibility of human vascular endothelial growth factor l 65(VEGF㈨)to transfect rabbit MSCs,and establish the experimental foundation of angiogenesis tissue engineering organization and the treatment of jschemic disorders. DESIGN:Observation control trail. SETTING:First Hospital of Jilin University and Institute of Frontier Medical Sciences of Jilin University. MATERIALS:The experiment was conducted in the Key Laboratory(BSL.21 of Frontier Medical Sciences of Jilin University between June 2003 and August 2004.Health New Zealand white rabbits,4.0 5 0 months old,weighing 2.5—3.5 kg.half male and half female,were provided by Animal Center of Jilin University.The rabbits were handled under asepsis and anesthetized condition corresponding to the animal ethical stnadard.Medicine and reagents:Ham F l 2 culture media(Gibco,U.S),MTT(Sigma,U.S) PLXSNKDRp—VEGFI65 and pcDNA 3.0 vectors were prepared in the present laboratory.ELISA detection kit(Jingmei company. Shenzhen),DH5Ⅱ,restriction endonucleases Bam H I,Xhol I,Hind III,EcoR I and standard DNA molecule(Promega, U.S1 were also used in this study. METHODS:Rabbits’MSCs were separated and cultivated.The pcDNA 3.0.hVEGF165 expression vector was constructed and identiifed.pcDNA3.0一VEGF165 eukaryotic expression vector was constructed,the vector was used directly to transfect MSCs.The cultural supernatant then was collected and the soluble protein of human VEGF gene expression was analyzed with ELISA method The proliferation capability of human umbilical vein endothelial cells(HUVEC1 stimulated by the supernatant was measured with MTT methods.untreated MSCs and pcDNA3.0 transfected MSCs were used as control groups MAIN 0UTC0ME MEASURES:(1)Result of restriction enzyme digestion and DNA sequencing of the recombinant plasmid pcDNA3.0一VEGFI65; the secretion of human VEGFI65 proteins of the transfected MSCs analyzed by ABe—ELISA;⑧MTT method was used to detect the effects of MSCs culture supernatant transfected with VEGF】65 on HUVEC cells proliferation ability. RESULTS: )Result of restriction enzyme digestion and DNA sequencing of the recombinant plasmid:The constructed plasmid was digested with Hind III and XHol I.and then two pieces fragments were jsolated with agarose gel electrophoresis.which was accordance with expected results.And sequencing results showed that pcDNA3,0一VEGF】65 eukaryotic expression vector was successfully constructed.(2)ABC—ELISA method:Compared with the control group,concentration of human VEGF protein in the supernatant of the cultured cells increased sjgnificantly after the MSCs were transfected with pcDNA3.0一VEGF 65 for 24,48,72 hours(P<0.051. MTT method was used to detect the effects of MSCs culture supernatant transfected with VEGF l 65 on HUVEC cells proliferation ability.The results showed MSCs supernatant transfected with VEGFl65(2%,4%, 8%,l 6%,and 32%1 had statistical significance in promoting HUVEC cells proliferation rate compared with the normal control(P <0.05). C0NCLUS10N:Human VEGF gene can be successfully transfected into MSCs and expressed effectively. months old,weighing 2.5—3.5 kg,half male and INTRODUCTION half female,were provided by animal center of Jilin University.They were raised at according to the Vascular endothelial growth factor(VEGF1 is a rule of animal raise. very effective way to make tissue engineer bone vascularized -J1Medicine and reagents .However.because of its short half-life,VEGF could not maintain effective Ham F1 2 culture media(Gibco,U.S),MTT(Sigma, concentration in blood after injection” .It is U.S)PLXSNKDRp—VEGF and pcDNA 3.0 also very expensive.To resolve the problem vectors were prepared in the present laboratory. effectively,gene transfection technique was used ELISA detection kit was provided by Jingmei in this experiment to transfer human VEGF into Company, Shenzhen;DH5 Q , restriction seed cells—mesenchymal stem cells(MSCs)of endonucleases Bam H I.Xhol I。Hind III, tissue engineer bone and to make it secrete VEGF EcoR I.and standard DNA molecule by Promega, which could vascularize bone.The present IJ.S. exploration will oflfer useful way to construct vascularized engineering tissue and treat COnstru tlOn and ldentlflcatlOn Of pcDNA j schemic diseases. 3. hVEGF165 expresslon ve tor PLXSN—KDRp—VEGFl6 and pcDNA 3.0 were MATERIALS AND MEn_IODS linked tOgether tO be pcDNA 3.0一KDRp—VEGF165 recOmbinant after theV were digested with Bam H Animals I and Xhol 儿,then pcDNA 3.0一KDRp—VEGF1 65 Thirty health New Zealand white rabbits,4-5 was digested with EcOR I tO remOve KDRp and get lssN l673.8225 CN 2l一1539,R coDEN ZLKHAH Department of Nuclear Medicine. First Hospital of Jil1n University. Changchun l 30021. Jilin Province.China; ’Department of Biochemistry. Institute of Frontier Medical Sciences. Jilin University. Changchun l3【x】2l Jilin Province.China Xu Song—bai☆. Studying r0r d0ct0ra【e. DeDanment 0f Neur0su gery, r H0sDltal of Jinn Universitv. Chan2chun l 3【x】2l Jllm Pr()vincc.china xus0n2bai@ gmall com C0rresD0ndence to Zha0 Gan2. Pr0ress0L D0ct0r’s tut0r.I)eDanment 0f Neur0sur2erv. F计st H0sDltal of Jlhn Unlversitv. Chan2chun l3【x】21. Jilin Pr0vince.China Supp0ned by: 【he Nati0nal Natural Sclence F0undati0n 0f China. N0 3O47l768, CO3030307 : the Natural Sclence F0und aIion 0f Jilin Province. N0 2【x】3053622 Received:2oo8-O2—15 AcceDted:2【x】8—02-l7 f08-50.1-798,GW) Xu SB.Zha0G Zha0 HG Xu K.Yu H0. H0u Y Studv Of VEGF transrecti0n 0n rabbit mesenchvmal stem cel1s Zh0n22u0 Zuzhl Gon2chen2 Yaniiu vu Linchuan2 Kan£ru 2【x】8:)2(J 2): 2387 2390(China) 1www gIc kf c0 m, glck 由0umal, ; p 2387 维普资讯 http://www.cqvip.com
www.zglc ̄com pcDNA 3.0一VEGF165 recombinant Transform competent cells(CaC12 method);amplify pcDNA3.0一VEGF165 plasmid (alkaline lysis method),detect plasmid DNA content and purity(ultraviolet spectrophotometry),digested by Xhol I and Hind III,agarose gel electrophoresis and sequencing. Separation and cultivation of MSCs Healthy New Zealand rabbits were anesthetized by intraperitoneal injection with 3%pentobarbital f50 mg&g). Proximal tibia was exposed under asepsis condition.Then 2 mL bone marrow was drawn out from medullary cavity of bones with injector containing 0.1 mL heparin(3 000 U/mL), washed by PBS for three times,suspended by Ham F—l 2 culture medium and then the suspension was put into equal volume Percoll separating medium, centrifuged with 2 000 r/min for 20 minutes.Ivory white cell layer was taken out and rinsed by PBS for twice.suspended with Ham F一1 2 culture medium.These cells were cultured in culture flask in 37℃.5%CO,conditions. In vitro VEGFles gene transfectlon and screening In MSCs MSCs were cultured with conditional medium r 1 640 complete medium adding 1 0一mol/L dexamethasone. 1 0 mmol/L B—sodium glycerophosphate,50 mg/L Vitamin C)in 37℃,5%CO,conditions before transfecd with VEGF 1 65 gene.After planted in 6 pore plates of 1.0x 1 0 per pore for 1 2—1 8 hours.the MSCs were transfected according to the instruction of Lipofectamin 2 000 (GIBC0).72 hours later,they were screened with DMEM containing G4 1 8(400—600 mg/L).Five days later,the cells were continued to screen with G4 1 8(200 mg/L)for another l 0 days.Then,after digestion and collection.positive clone was acquired. DetectIon of VEGFles protein expression after transfectIon by ELISA quantitative assay Double antibodies ABC—ELISA kit was used to determine VEGF165 protein expression of 24,48,72 hours after transfection,the second and the twellfh generation after screening. ProIIferatlon activity of HUVEC ceIIs cultured with MSCs cuIturaI supernatant after transfectlon with VEGFles 。 MSCs cuhural supernatant after transfection with VEGF,65 for 72 hours was diluted to 2%.4%,8%.16%and 32% cOncentratiOn.Human umbilical vein endothelial cells (HUVEC1 was seperated and cultured .Adding these kind Of MSCs cultural supernatant to human umbilical vein endothelial cells fHUVEC1 cells and then HUVEC cell proliferation activity was assayed with MTT method,five same samples per group. Statistical analysis The data were analyzed by the first author.SPSS 1 3.0 statistic software was used to analyze data with ANOVA method,and q—test was used to compare the differences between different groups. 2388 徐松柏.等.VEGF基幽修饰兔骨髓闯充质一}I细匏的研究 REsUU_s Identlflcatlon of plasmld enzyme digestion The constructed plasmid was digested with Hind III and XHol I,and then two pieces fragments(Figure 1)were isolated with agarose gel electrophoresis.which is accordance with expected results.And sequencing results showed that the constructed plasmid was pcDNA3.0.VEGF1^ . Expresslon of VEGFles protein In the transfected MSCs MSCs supernantant was collected after transfection for 24. 48.72 hours and screening for the second and twelfth generation,the supernatant was assayed bv ABC.ELISA method.The results showed that VEGF.65 protein increased after the MSCs cells was transfected with VEGF165 for 24 hours,and then the protein level decreased at 48 and 72 hours,which has statistical significance compared with control group(P<0.O5)(Tlable 1).There could still detect high protein level after screening for the second and twelfth generation. CulturaI supernatant e什ects of MSCs transfected with VEGFles on proliferation ablllty of HUVEC cells MTT method was used to detect the effects of MSCs culture supernatant transfected with VEGF1 65 on HUVEC cells proliferation ability.The results showed that HUVEC cells proliferation rate was 1 30.4%±1 3%. 134.8%±15%,122.8%±10%,l44.0%+-8%,l58.6%+-20% with 2%,4%,8%,16%and 32%MSCs supernatant transfected with VEGFf65 which has statistical significance compared with the normal control(P<0.05) fTable 2 and Figure 2). PO.Box 1200.Shenyang 110004 kf23385083@sina.corn 维普资讯 http://www.cqvip.com
徐松柏w.z等VEGF基嘲修饰兔骨髓闻充硬于细№的研究R~Rwwglc何c。mVEGF.65.Theresearchcouldestablishthebasisforconstructingvascularizedengineeringtissue,implantationrepairandischemicdiseasetreatment.VEGF】65inthepresentexperimentwasakindofsecretaryprotein,whichhastheactivityofbindingwithheparin.50%OfVEGFissecretedtothecelloutsideasaresolublestyleandtherestpartbondtothecellsurfaceandextracellulart“marix…‘‘.TheResolubleandinsolublepatternofVEGF.6swasfittedtoadiustvesselformation.Whenthebodyneedsit.VEGFexistedmostlyasresolubletype.whilewhenvesselformationexcessively,VEGFbindstobasementmembraneasinsolubletypeanddecreasesthesideeifectstothebody.InthepresentreportsVEGFusedingenetransfectionitlvitroprincipallywasVEGF…‘….65.Whetherthetransfectedgenecouldexpresseffectivelyandgeneexpressionproductshaveactivitieswasthecriticalpointofthepresentexperiment.ELISAresultsofculturalsupernatantoftheVEGF.65transfectedcellsshowedthatVEGF。65proteinincreasedafterMSCswastransfectedwithVEGFl65byliposome.TheVEGFl65proteinexpressionlevelreachedtothetopat24hoursaftertransfectionandthenshoweddecreasingtendency.andtheprotein1eveldecreasedobviouslyatthetwelfthgenerationafterscreening.Theseresults:howedthatVEGFl65proteincouldbeexpressedhighlyinMSCscellstransfectedwithpcDNA30一.VEGFt65andespeciallyasthetransientexpression.VEGFcouldpromotetheproliferationofvesselendothelialcells.sothegenetransfectedcellsexpressionproductsactivitiescouldbedetectedbymeasuringtheeffectsofsupernatantofMSCstransfectedwithVEGFgenetovesselendothelialcells.ThepresentexperimentchoseDlSCUSSl0NHUVECceIlsastheeffectceI】s.TheresultsshowedthatculturalsupernatantcouldpromotetheproliferationofSeedcellwastheoneofthefocusesinboneengineering.HUVECcells.ItprovedthattheexpressionproductsofTheidealseedeellshouldhavethefollowingconditions…0:VEGFgene—transfectedcellshavethebiologicalactivityofUjcertainboneformationability;②easilyacquired;⑨VEGF.A11theseresultsshowedthatVEGFgenetreatmentquickproliferationabilityinvitro;㈤stablebiologicaltakeefectsinfacilitatingvesselproduction.characteri,lvitroculture.MSCscellshastheadvantageofThepresentexperimenttransfectedVEGFl65geneintoboneformingpotentialityenetrasfectiontechni,easilyacquired,easilyprickingMSCscellswithgquesuccessfullyandgottenVEGFexpressedhighlyinsupernatantof,litfletrauma.amplesource,whichhasbeenthel65proteintoeenrreseransemphasisftissugineearch’…’fectedcells.VEGFj~sproteinstillexpressedhighlyin.VEGFwhietwelfthenerationafterscreenedwithG418.ThechfirstfoundbyFerraraandGospodarowicz0IUIthgexproductsofthosecellstransfectedwithVEiGFn1989wasakindofglucoproteinseparatedfromcattlpressionehastheVEGFl65biologicalcharacterandcouldobviouslypituitaryglandfolliclestellatecells.Itcouldfacilitatefacilitatevesselendothelialcellsproliferation.vascularendothelialcellsgrowthandinducebloodvesselproduction.AmongthepresentmostknowngrowthfactorsREFERENCES(suchasbFGFandPDGF),VEGFhasthemostpowerfuln”’…vesselproductioabilityD.VEGFcouldmaintainvesseleCoppiPDeloD,FarrugiaL,etalAngiogenicgenemodifiedlimusclecellsforenhancementoftissueformaifonTissueEnnormashapeandntegritypromotevesselpermeabilityg2005:ll,,(78、:10341044facilitateendotheliajcellprolircrationandvesselproduction.BetzVM,BetzOB.HarrisMB,etaIBone[issueengineeringandWhilductionIeepairbygenetherapyFrontBiosci2008:l(13):833vesselproductioneffectsofothervesselpro841AwadHA.Zhan.RenoDGetaRtfactorswereimplementedthroughcompletelgXyldslSchwarzEM.ccenyorpartlyadvancesingenedeliveryforstructuralbonealIograftsTissueEngd。‘‘。、”enhancingVEGFproteinexpressionanproduction2007:13(8):19731985.RABVEGF:anessentialmediatorofbothanecentstudigiogenesisesshowedthatVEGFproteininjectiDaiJ.Rabieonorgeneandendoch0『1dralossification.JDentRes2006;86(10):937950treatmenthasbrightfutureintissuerepairandvesselJlaXJ.LiuL.GongSL,eta1.ConstructionofrecombinantDNA16djnregenerationl131encoghumanvascularendothelialgrowthfactoranditsexpression.invitro.Jin¨DaxueXuebao:YixueBan2002;28(11:11一l3Basedontheabovementionedcharacteristics.thepresentLtiXWangR.CultureandidentifytheendothelialcellsofhumanexperimentchoseMSCsasthetargetcellofgeneimportumbilicalveill.WeiShengYahJiu2001:30(3):l88一189,ngTFXiaR丫YangCH.eta1StudyofgelatinizedmarrowstromawhichconIdpromoteexpressionofVEGFproteiGonandosteoblastsand[rueboneceramicactivebone.ChinJTraumatoIvascularizationoftissueengineeringbonebyimported2005:8(2):9l一95ISSN16738225CN2l。l539,RCODEN:ZLKHAH2389维普资讯 http://www.cqvip.com
www.zglckif.co 8 Mao X,Chu CL,Mao Z,et a1.The development and identification of constructing tissue engineered bone by seeding osteoblasts from diff.erentiated rat marrow stromal stem cells onto three—dimensional porous nano.hydroxylapatite bone matrix in vitro.Tissue Cell 2oo5: 37(5):349—357 9 Chamberlain G Fox J,Ashton B,et a1.Concise review:mesenchymal stem cells:their phenotype,differentiation capacity,immunological features.and potential for homing.Stem Cells 2007;25(11):2739—2749 10 Ferrara N,Henzel WJ.Pituitary follicular cells secrete a novel heparin.binding growth factor specific for vascular endothelial cells. Biochem Biophys Res Commun l989;l6l(2):851.858 l1 Ennett AB,Kaigler D,Mooney DJ.Temporally regulated delivery of VEGF in vitro and in vivo.J Biomed Mater Res A 2006;79(1): l76一l84 l2 Wu ZJ,Zhang H.Y_u L.et a1.Consturction of human VEGFl65 gene eukaryotic expression plasmid and its effect on proliferation of vascular endothelial cells.Hepatobiliary Pancreat Dis Int 2005:4(3): 364.369 l 3 Stalmans I.Role of the vascular endothelial growth factor isoforillS in retinal angiogenesis and DiGeorge syndrome.Verh K Acad Geneeskd Belg 2005;67(4):229.276 l4 Hsion ̄SX.Mooney DJ. Regeneration of vascularized bone. Periodontol 2000 2006;4l:l09一l22 l5 Yang J,Zhou w’Zheng w’et a1.Effects of myocardial transplantati0n of marrow mesenchymal stem cells transfected with vascular endothelial growth factor for the improvement of heart function and angiogenesis after myocardial infarction.Cardiology 2oo6:l07(1): l7—29 16 Huang YC,Kaigler D,Rice KQ et a1.Combined angiogenic and osteogenic factor delivery enhances bone marrow stromal cell—driven bone regeneration.J Bone Miner Res 2005;20(5):848—857 l7 Lahtinen M,Blomberg Baliulis Q et a1.In vivo h—VEGFl65 gene transfer improves early end0thelialisati0n and patency in synthetic vascular grafts.Eur J Cardiothorac Surg 2007;3l(3):383—390 l 8 Weng W_ang M,Liu W,et a1.Repair of experimental alveolar bone defects by tissue—engineered bone.Tissue Eng 2oo6:l2(6):l503一l5l3 l9 Goldstein AS.Effect of seeding 0ste0pr0genit0r cells as dense clusters on cell growth and differentiation.Tissue Eng 200l:7(6):8l7—827 VEGF基因修饰兔骨髓间充质干细胞的 研究:l::l:☆ 徐松柏 ,赵刚 ,赵红光 ,许侃 ,于洪泉 ,候宜 吉林大学第一医院, 神经外科, 核医学科,吉林省长春市 130021; 吉林大学再生医学科学研究所生物化学教研室,吉林省长春市 l3002l 徐松柏☆,男,1978年生,吉林省吉林市人,汉族,吉林大学第一医 院在读博士,主要从事颅骨组织X-程学的研究 通讯作者:赵刚,教授,博士生导师,吉林大学第一医院神经外科, 吉林省长春市 130021 国家自然科学基金资助课题(30471768/C03030307)“组织X-程材料栓 塞颅内动脉瘤的实验研究” ;吉林省自然科学基金资助课题 (2003053622)“转基因技术构建组织X-程化颅骨修复材料的实验 研究” 摘要 背景:血管内皮生长因子的应用是组织工程组织血管化的有效手段。 但是,血管内皮生长因子价格昂贵,并且半衰期非常短,很难在体内 保持有效的作用浓度。故本实验将其转入组织工程的种子细胞——骨 髓间充质干细胞中,使骨髓间充质干细胞能够有效地分泌血管内皮生 长因子,从而达到促进血管生成的目的。 2390 徐松柏 等VEGF基因修饰兔骨髓阚充硬干细匏的研究 目的:探讨应用人血管内皮生长因子165进行基因修饰的可行性,为 血管化组织工程组织的构建及缺血性疾病的治疗奠定实验基础。 设计:观察对比实验。 单位:吉林大学第一医院和吉林大学再生医学科学研究所。 材料:实验于2003—0612004—08在吉林大学再生医学科学研究所吉林 大学重点实验室(生物安全实验室二级)完成。健康新西兰大耳白兔 由吉林大学实验动物中心提供。4.0~5.0月龄,体质量215 ̄315 kg,雌 雄兼用,实验过 巾对动物处置均 :麻醉状态、无菌条件F完成,符 合动物伦理学标准。实验药品及试剂:Ham F12培养基(GIBCO公司), 噻唑蓝(MTT)(Sigma公司),pLXSN—KDRp.VEGF165与pcDNA3.0载 体由本实验室自备,ELISA检测试剂盒(深圳晶美生物公司),感受态 大肠杆菌DH5 ̄t、限制性内切酶BamH I、Xho I、HandlII、EcoR I和 标准DNA分子(Promega公司)。 方法:分离、培养新西兰大白兔骨髓间充质十细胞。构建并鉴定 pcDNA3.0一VEGF。 真核表达载体,利用脂质体介导其转染骨髓问充 质干细胞,采用ELISA方法榆测转基因骨髓问充质干细胞的人血管内 皮生长因子蛋白表达,MTT法检测转基因骨髓间充质干细胞表达物 对血管内皮细胞增殖活性的影响,设单纯培养骨髓问充质干细胞及 pcDNA3.0转染骨髓问充质干细胞组为对照组。 主要观察指标:①重组质粒双酶切和基因测序分析。②ABC—ELISA法 观察质粒转染后的骨髓间充质干细胞的人血管内皮细胞生长因子蛋 白表达。③通过MTT法检测人血管内皮生长因子165基因转染骨髓 间充质干细胞培养上清对血管内皮细胞增殖的影响。 结果:①构建的质粒用Hind III和Xho I双酶切、琼脂糖凝胶电泳鉴 定结果与预期完全相同,PCR和酶切鉴定正确后行测序鉴定,测序 结果正确,证明所构建的质粒为pcDNA3.0一VEGF165重组质粒。② ABC—ELISA法检测结果表明,人血管内皮生长因子165基因重组载 体转染骨髓问充质干细胞后24 h,即有较高水平的人血管内皮生长因 子165蛋白表达,48及72 h呈F降趋势,但与对照组比较,差异显 著(P<0.05)。③MTT法检测人血管内皮生长因子165基因转染骨 髓问充质干细胞培养上清对血管内皮细胞增殖的影响,结果显示,含 2%,4%,8%,16%和32%转染人血管内皮生长因子165基因的骨髓间 充质干细胞培养上清促血管内皮细胞增殖率均高于对照组(P< 0.05)。 结论:人血管内皮生长因子165基因可成功地转染至骨髓问充质干细 胞中,并可进行有效地表达。 关键词:骨髓问充质干细胞:血管内皮生长因子;基因;转染;骨髓 祖代细胞:组织工程 r}1图分类号:R394.2文献标识码:A 文章编号:1673 8225(2008)l2-02387—04 徐松柏,赵刚,赵红光,许侃,于洪泉,候宜.VEGF基因修饰兔骨髓 间充质干细胞的研究….中国组织工程研究与临床康复,2008, 12(12):2387-2390 【WWW.zglckf.corn/zglckffejournal/upfiles/08-12112k-2387(ps).pdfl fEdited by Ji H/Wang L) P.O.Box 1200,Shenyang 110004 kf23385083@sina.com
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