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1、AT2R基因在體電穿孔轉(zhuǎn)染抑制大鼠頸總動(dòng)脈新生內(nèi)膜增生屈小玲[基金項(xiàng)目]:國(guó)家自然科學(xué)基金面上項(xiàng)目(30670521)[通訊作者]:劉建平,電話(023)68773050,Email:liujianping1022@hotmail.com,劉德蜂,劉建平(400038重慶,第三軍醫(yī)大學(xué)西南醫(yī)院心內(nèi)科) [摘 要] 目的:探討AngⅡ2型受體(AT2R)基因局部電穿孔轉(zhuǎn)染對(duì)大鼠頸總動(dòng)脈球囊損傷后新生內(nèi)膜增生的影響。方法:建立大鼠頸總動(dòng)脈球囊損傷模型,用局部電穿孔方法轉(zhuǎn)染AT2R真核表達(dá)載體(pEGFP-AT2R)或空載體(pEGFP-
2、N2),分別于術(shù)后7、14和21d用HE染色及RT-PCR方法,進(jìn)行AT2R、AngⅡ1型受體(AT1R)在頸動(dòng)脈壁中表達(dá)的變化和組織形態(tài)學(xué)分析,檢測(cè)其對(duì)在體血管新生內(nèi)膜的影響作用。結(jié)果:pEGFP-AT2R轉(zhuǎn)染21天后,轉(zhuǎn)染組大鼠頸動(dòng)脈AT2RmRNA表達(dá)為(1.262±0.317),空轉(zhuǎn)組為(0.396±0.100),,單純損傷組為(0.410±0.053),轉(zhuǎn)染組較空轉(zhuǎn)組和單純損傷組相比差異有統(tǒng)計(jì)學(xué)意義(P<0.01);球囊損傷后21天時(shí)AT1R的表達(dá),轉(zhuǎn)染組為(0.469±0.065)、空轉(zhuǎn)組為(0.363±0.046)、單純
3、損傷組為(0.373±0.045),轉(zhuǎn)染組較空轉(zhuǎn)組和單純損傷組相比差異有統(tǒng)計(jì)學(xué)意義(P<0.05),空轉(zhuǎn)組和單純損傷組間無顯著差異(P>0.05);轉(zhuǎn)染組的內(nèi)膜面積與中膜面積比(I/M)為(0.828±0.101),空轉(zhuǎn)組為(1.432±0.086),單純損傷組為(1.515±0.078),轉(zhuǎn)染組較空轉(zhuǎn)組和單純損傷組相比差異有統(tǒng)計(jì)學(xué)意義(P<0.01)。AT2R轉(zhuǎn)染組與單純損傷組相比,使實(shí)驗(yàn)動(dòng)物新生內(nèi)膜增生平均受抑制率達(dá)45.35%。結(jié)論:在體血管局部電穿孔轉(zhuǎn)染AT2R基因可使AT2R在損傷血管組織表達(dá)較單純損傷組明顯增加。AT2R基
4、因與AT1R基因之間表達(dá)量上不存在此消彼長(zhǎng)的關(guān)系。[關(guān)鍵詞] 基因;AT2R;基因轉(zhuǎn)染;內(nèi)膜增生;損傷 InvivoAT2RgenetransfectioninratcommoncarotidarteriesinhibitsneointimalhyperplasiaafterballoonangioplastybyelectroporationQuXiaoling,LiuDefeng,LiuJianping,(DepartmentofCardiology,SouthwestHospitaofThirdMilitaryMedicalU
5、niversity,Chongqing400038,China.) [ABSTRACT] AIM:TostudytheeffectsofinvivolocaltransfectionAT2Rgeneonneointimalhyperplasiainratcommoncarotidarteriesafterballoonangioplastybyelectroporation.METHODS:Ballooncatheterdenudationoftheendotheliumofratcommoncarotidarterywasrout
6、inelyusedasamodelofrestenosis.ThepEGFP-AT2RgroupandthepEGFP-N2groupweretransfectedbyelectroporation.Thearterieswereharvestedat7days,14daysand21daysaftergenetransfer.TheeffectsofAT2RonneointimalhyperplasiaofinvivolocalarterieswereevaluatedbyRT-PCRandHEstaining.RESULTS:At
7、day21afterAT2Rdeliveredintoinjuredratcommoncarotidarteries,theexpressionofAT2RmRNAinthepEGFP-AT2R,pEGFP-N2andinjuredgroupwas1.262±0.317,0.396±0.100and0.410±0.053,respectively.IncomparisonwiththepEGFP-N2andinjuredgroup,transfectionoftheinjuredarterieswithAT2Rmarkedlyincr
8、easedAT2Rlevels(P<0.01).Atday21afterballooninjure,theexpressionofAT1RmRNAinthepEGFP-AT2R,pEGFP-N2andinjuredgro