大肠侧向发育型肿瘤内镜下的诊断与治疗

目的探讨大肠侧向发育型肿瘤（LST）临床病理特征及内镜下黏膜切除术的有效性、安全性。方法经普通内镜检查发现LST 119例,染色后观察病灶大小及部位并进行形态分型,再结合放大内镜确定腺管开口类型。有治疗适应证者行内镜下黏膜切除术,切除病灶黏膜送病理检查。结果 28个月中共发现119例LST 124个病变。内镜下分型：颗粒均一型44个,结节混合型48个,平坦隆起型23个,假凹陷型9个。病变直径：10～20 mm 65个,21～30 mm 23个,31 mm以上36个,最大病变110 mm×100 mm。病变部位：直肠50个,乙状结肠25个,降结肠11个,横结肠10个,升结肠＋盲肠28个。黏膜腺管开口类型：Ⅲ型30个,其中17个为管状绒毛状腺瘤,12个为管状腺瘤;Ⅳ型56个,其中30个为绒毛状腺瘤,4个为黏膜内癌;Ⅴ型5个,其中2个为黏膜内癌,2个累及黏膜下层下1/3以下;Ⅱ型7个,其中5个为炎性增生性息肉,2个为锯齿状腺瘤（腺瘤性增生性息肉）：其余为ⅢL＋V型,其中23个为管状绒毛状腺瘤。符合适应证95例98个病变择期进行内镜下黏膜切除治疗,发生出血11例,均在操作过程中,无肠穿孔发生。结论大肠LST内镜形态具有一定特殊性,内镜下黏膜切除术是治疗在大肠的有效而安全的方法,可达到根治目的 。     

放大内镜对早期大肠癌及其癌前病变的诊断价值

目的研究早期大肠癌及其癌前病变的放大内镜下特点及其与浸润深度的关系。方法应用电子放大内镜加靛胭脂染色观察了108例患者共129个大肠隆起性病变。结果129个病变中经病理诊断为肿瘤性病变(腺瘤及癌)的有106个。其腺管开口呈Ⅱ型者10个、ⅢL型者73个、Ⅲs型者1个、Ⅳ型者7个、V型者15个，没有Ⅴ型单独存在者。10个腺管开口Ⅱ型者病变病理多为轻度异型，无重度异型。15个出现Ⅴ型结构的病变中，10例癌变，5例病理为重度异型。10个癌变病变中均出现了Ⅴ型结构，7个黏膜内癌中6个呈ⅤA型，1个ⅤN型；2个黏膜下层癌均呈ⅤN型；一个进展期癌呈ⅤN型。研究中观察到10个侧向发育型肿瘤(LST)，放大内镜下腺管开口呈ⅢL型、Ⅳ型或Ⅴ型，其中1例癌变。结论放大内镜与实体显微镜观察息肉腺管开口形态基本一致。通过腺管开口观察可以很好的区分肿瘤性病变与非肿瘤性病变，其对肿瘤性病变的诊断具有重要的应用价值。     

大肠侧向发育型肿瘤临床意义及诊治

背景：火肠侧向发育型肿瘤(LST)是指起源于人肠粘膜的一类隆起型病变,这类病变极少向肠壁深层垂直侵犯,而主要沿枯膜表面呈侧向浅表扩散,故称之为侧向发育型肿瘤。大肠侧向发育型肿瘤(LST)其病变形态和发生发展上有一定的特殊性,不同于一般的腺瘤,LST与大肠癌的关系密切,并已有动态观察表明LST病变可以在3年内发展为进展期大肠癌。方法：应用放大内镜及粘膜染色方法在近一年共共检查2920名患。结果：发脱25例侧向发育型肿瘤,共26个病变。其中颗粒均一型11例,结节混合型15例,粘膜内确3例,锯齿状肿瘤2例;病变最大为60X72mm,最小为llXl2ram：11～20mm有6个：21-30mm：9个：31mm以上有11个病变。在26例病变中,腺管开口类型主要以Ⅳ型腺管开口为主,占61．54％（16／26);表现为VA型腺管开口的LST的3例患,病理诊断为粘膜内癌,7例表现为ⅢL型腺管开口类型的病例,病理诊断为管状绒毛状腺瘤;26例病变全部在发现病变的同时或择期进行EMR或EPMR切除治疗。全部病例未发生任何出血或穿孔等并发症。结论：对LST的临床检出必须应用粘膜染色技术和放大内镜,对有肠道粘膜发红或粗糙、血管网不清或消失的征象必须进行粘膜染包,以发现病变。LST的腺管开口大多数表现为Ⅳ型或ⅢL型,而Ⅳ型腺管开口多为绒毛状腺瘤,ⅢL型腺管开口多为管状腺瘤,一但出现Ⅴ型腺管开口则已经表明有癌变变发生。     

大肠黏膜腺管开口分型对早期大肠癌的诊断价值

目的 评价腺管开口分型对诊断早期大肠癌及癌前病变的临床实用价值。方法 2000年11月～2002年8月结肠镜检查4176例次，采用内镜下黏膜染色技术，部分病变结合放大内镜及实体显微镜观察腺管开口分型(pit分型)并与病理诊断对照，pit分型采用工藤分型。结果 752例患者发现大肠隆起、扁平等不同病变共955个，共检出早期大肠癌14例，进展期癌209例，Ⅱa、Ⅱb、Ⅱc、Ⅱa Ⅱc病变76个。侧向发育型肿瘤(LST型)病变43个，直径16～110mm，其中Ⅱ型2个，ⅢL18个，Ⅳ19个，ⅤA型1个，ⅤN型3个。非肿瘤性息肉以Ⅰ、Ⅱ型腺管开口为主，占85．4％(303／355)；而腺瘤性息肉则以Ⅲ、Ⅳ型腺管开口为主，占86．0％(504／586)；进展期癌均表现为黏膜腺管开口破坏无结构，为ⅤN型；14例早期癌中有8例腺管开口为Ⅴ型，其中ⅤA型2个，ⅤN型6个。结论 大肠腺管开口分型对于判断肿瘤性、非肿瘤性病变以及早期大肠癌并指导及时的内镜治疗或手术切除具有重要意义及临床实用价值。     

放大内镜下大肠黏膜腺管开口分型对早期大肠癌检出的意义

目的 评价腺管开口分型对早期大肠癌及癌前病变检出的临床价值.方法 回顾2004年11月至2007年8月结肠镜检查,采用内镜下黏膜染色技术,结合放大内镜及实体镜观察腺管开口分型并与病理诊断对照,腺管开口分型采用工藤进英分型标准.结果 结肠镜检杳大肠病变共1496个,非肿瘤性病变占30.6%(458/1496),各类型腺瘤占43.9%(657/1496),大肠癌占25.5%(381/1496).早期大肠癌61个;大肠侧向发育型肿瘤36个,直径10～62 mm,其中Ⅱ型3个,Ⅲ1.型14个,Ⅳ型17个,Ⅴ型2个.管状腺瘤中以低级别上皮内瘤变居多,占87.5%(363/415);管状绒毛状腺瘤高级别上皮内瘤变占40.7%(61/150);绒毛状腺瘤腺管开口以Ⅳ型为主,高级别上皮内瘤变达85.7%(42/49).结论 大肠腺管开口分型对于判断肿瘤性、非肿瘤性病变以及早期大肠癌的检出有重要意义,对及时进行内镜治疗或手术切除具有一定的临床指导意义.     

大肠侧向发育型肿瘤的临床特征及内镜下手术治疗效果观察

目的探讨大肠侧向发育型肿瘤(laterally spreading tumors,LST)的临床特征及内镜下手术治疗效果.方法选择2015-01/2016-01厦门大学附属翔安医院消化内科收治的120例LST患者为研究对象,均接受内镜下手术治疗.记录患者年龄、性别、病变大小、LST分型、病变部位、病理类型、腺管开口,并分析腺管开口、腺管分型与病理分型关系以及治疗情况.结果120例患者中男女比例为1.61:1,年龄以60-69岁、50-59岁最为多见;病灶直径主要为20-29cm;病灶主要位于直肠,其次为乙状结肠;病理分型以绒毛状腺瘤最为多见,其次为管状绒毛状腺癌;病灶分型以颗粒均一型最为常见,其次为结节混合型;腺管开口主要为ⅢL型;结节混合型和颗粒均一型均以Ⅳ型开口为主,假凹陷型以ⅤA型开口为主,扁平隆起型以ⅢL型开口为主,差异具有统计学意义(P 0.05);ⅤA型腺管开口均为黏膜内癌,Ⅳ型多为绒毛状腺瘤,ⅢL型多为管状腺瘤,差异具有统计学意义(P0.05);行内镜黏膜下层剥离术(endoscopic submucosal dissection,ESD)治疗9例(7.50%),内镜黏膜切除术(endoscopic mucosalresection,EMR)治疗61例(50.83%),内镜分次黏膜切除术(endoscopic piecemeal mucosal resection,EPMR)治疗50例(41.67%);EMR和EPMR组LST病灶分布主要为结肠和直肠, ESD组均分布为直肠,差异具有统计学意义(P 0.05); EMR组LST直径主要为10-19 cm、20-29 cm, ESD组和EPMRLST直径主要为20-29cm以上,差异具有统计学意义(P 0.05);EPMR术后复发率高于EMR组、ESD组,差异具有统计学意义(P0.05);三组出血率比较,差异无统计学意义(P0.05).结论LST好发于男性,中老年人群易患病;病变大小多为20-29cm;直肠为其好发部位;病灶分型主要为颗粒均一型、结节混合型,腺管开口主要为ⅢL型,病理类型多为绒毛状腺瘤,不同病理分型、病灶分型腺管开口存在明显差异; EMR和EPMR术是治疗LST的常见术式, ESD常用于治疗直肠病变; EPMR适合结肠和直肠较大病变治疗,但其复发率较高, EMR适用于结、指肠较小病变治疗.     

富士能智能染色内镜在大肠扁平病变诊治中的应用价值

目的探讨富士能智能染色内镜（FICE）技术在大肠扁平病变诊断及指导治疗中的临床价值。方法应用富士能智能染色内镜技术对72例患者的87个大肠扁平病变观察,其中侧向发育型肿瘤（LST）12个,按工藤分型进行腺管开口诊断,并行病理活检,部分病例行全瘤切除送检或外科手术治疗,将FICE内镜诊断结果与病理学诊断结果相比较。结果 FICE内镜技术诊断非肿瘤性病变及肿瘤性病变的病理符合率分别为88.24%、97.22%,总病理符合率为91.95%,12个LST腺管开口Ⅱ型1例,ⅢL型4例,Ⅳ型5例,ⅤA型2例,病理结果均为腺瘤,并伴有不同程度的非典型增生。结论通过FICE放大内镜对大肠扁平病变腺管开口的形态观察可以大致预测病理组织学诊断及病变的浸润深度,指导正确的治疗方法。     

结直肠侧向发育型肿瘤内镜诊断与治疗

目的探讨结直肠侧向发育型肿瘤(LST)内镜诊断方法,经内镜黏膜切除术(EMR)、分片切除术(EPMR)、内镜黏膜下剥离术(ESD)方法治疗LST的疗效、安全性。方法 LST经色素染色放大内镜或NBI-ME观察病变形态、腺管开口分型(pit)及表面微血管分型(MP),分别进行EMR、EPMR、ESD或外科手术治疗,并分析LST的病理特点。结果在399例病人检出有LST,共407个病变。LST大小在10～80mm。LST部位在直肠128个(31.4%),乙状结肠97个(23.8%),降结肠54个(13.3%),横结肠67个(16.5%),升结肠21个(5.2%),盲肠36个(8.8%),回肠末段4例(1.0%)。LST形态呈颗粒均一型145个,结节混合型161个,扁平隆起型63个,假凹陷型38个。LST腺管开口分型以ⅢL和Ⅳ为多。405个LST经肠镜微创电切治疗,228个行EMR切除,165个行EPMR切除,12个行ESD切除,均在内镜下成功电切,另2例LST行外科手术治疗。出血发生率4.0%,术中即刻出血4例,术后3天迟发出血12例,无肠穿孔发生。LST病理结果:管状腺瘤46个(11.3%),管状绒毛状腺瘤146个(35.9%),绒毛状腺瘤181个(44.5%),增生性息肉10个(2.5%),高级别上皮内瘤变19个(4.7%),黏膜内癌3个(0.7%),黏膜下癌2个(0.4%)。术后复查肠镜无复发。结论色素染色放大内镜或NBI-ME方法有利于检出LST,EMR、EPMR、ESD是内镜下治疗LST安全有效的方法。     

大肠黏膜表面结构对早期大肠癌及其癌前病变的诊断价值

目的 探讨大肠黏膜病变表面腺管开口分型对早期大肠癌及癌前病变的临床应用价值.方法 应用电子放大内镜结合黏膜染色方法观察了144例患者共162处大肠黏膜病变,并结合病变大体形态特点及病理组织学结果进行分析.结果 162处病变中非肿瘤性病变表现为Ⅰ型及Ⅱ型腺管开口者占76.5%（26/34）;肿瘤性病变表现为Ⅲ、Ⅳ和Ⅴ型腺管开口者占96.1%（123/128）.癌性病变则主要以Ⅴ型腺管开口为主,占75.0%（9/12）,其中3例进展期癌均表现为ⅤN型腺管开口.结论 大肠黏膜腺管开口分型对判断非肿瘤性病变、肿瘤性病变及早期大肠癌具有重要意义,并对临床治疗方式的选择具有指导意义.     

放大内镜对大肠粘膜病变的诊断价值

目的　探讨放大内镜结合腺管开口分型对大肠粘膜病变性质的诊断价值。方法　放大内镜检查发现病变后 ,对病灶喷洒靓胭脂 ,观察病灶粘膜腺管开口形态 ,按Kudo分型作病灶性质判断 ,并与切除或活检组织作病理学比较。结果　在 194处病灶中 ,放大内镜诊断为炎性息肉、管状腺瘤、绒毛状腺瘤和大肠癌的病理符合率分别为 10 0 %、93 3 %、90 9%、10 0 % ,总病理符合率为 96 1%。结论　放大内镜对判断大肠病变性质有较高的病理符合率 ,可区分肿瘤与非肿瘤、良性与恶性肿瘤 ,预测癌的浸润深度 ,决定合适的治疗方式 ,具有较高的临床应用价值     

妊娠时间与肺结核复发的相关性研究及诊治对策

目的 分析肺结核史患者妊娠时间和肺结核复发间相关性.方法 选取我院收治的有肺结核史的妊娠妇女576例作为研究对象,对其妊娠前肺结核治疗、治愈后妊娠时间、妊娠后复发肺结核等进行分析,总结有肺结核史育龄女性的妊娠时间和肺结核复发之间的关系.结果 肺结核治愈后不同时间段妊娠者的结核复发率比较,差异具有显著性（P＜0.05）,停药后间隔时间越久妊娠,肺结核复发的几率越小.结论 加强孕期痰菌检查,及早发现复发肺结核,提高母婴安全.     

我国骨关节结核诊治的回顾与展望

骨关节结核是危害人们健康的严重感染性疾病,近95％由他处结核病继发而来.罹患骨关节结核疾病后几乎均将致残,严重影响人们的健康、工作和生活.建国以来在党和国家的关心和支持下,骨关节结核的诊治水平取得了长足进步.时至今日,由于多种原因,学科发展和被重视程度受到一定的制约,同整个医疗行业的发展不相适应.回顾过去,展望未来,我们需要重新审视骨关节结核的诊治方法,努力推进骨关节结核诊疗技术的科学发展.     

Effect of phosphorylation of MAPK and Stat3 and expression of c-fos and c-jun proteins on hepatocarcinogenesis and their clinical significance

AIM To study the effect of phosphorylation ofMAPK and Stat3 and the expression of c-fos andc-jun proteins on hepatocellular carcinogenesisand their clinical significance.METHODS SP immunohistochemistry was usedto detect the expression of p42/44~(MAPK), p-Stat3,c-fos and c-jun proteins in 55 hepatocellularcarcinomas (HCC) and their surrounding livertissues.RESULTS The positive rates and expressionlevels of p42/44~(MAPK), p-Stat3, c-fos and c-junproteins in HCCs were significantly higher thanthose in pericarcinomatous liver tissues (PCLT).A positive correlation was observed between theexpression of p42/44~(MAPK) and c-fos proteins, andbetween p-Stat3 and c-jun, but there was nosignificant correlation between P42/44~(MAPK) and p-Stat3 in HCCs and their surrounding livertissues.CONCLUSION The abnormalities of Ras/Raf/MAPK and JAKs/ Stat3 cascade reaction maycontribute to malignant transformation ofhepatocytes. Hepatocytes which are positive forp42/ 44~(MAPK), c-fos or c-jun proteins may bepotential malignant pre-cancerous cells.Activation of MAPK and Stat3 proteins may be anearly event in hepatocellular carcinogenesis.     

Overweight and Obesity and Progression of ADPKD

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Replication and Inhibitors of Enteroviruses and Parechoviruses

The Enterovirus (EV) and Parechovirus genera of the picornavirus family include many important human pathogens, including poliovirus, rhinovirus, EV-A71, EV-D68, and human parechoviruses (HPeV). They cause a wide variety of diseases, ranging from a simple common cold to life-threatening diseases such as encephalitis and myocarditis. At the moment, no antiviral therapy is available against these viruses and it is not feasible to develop vaccines against all EVs and HPeVs due to the great number of serotypes. Therefore, a lot of effort is being invested in the development of antiviral drugs. Both viral proteins and host proteins essential for virus replication can be used as targets for virus inhibitors. As such, a good understanding of the complex process of virus replication is pivotal in the design of antiviral strategies goes hand in hand with a good understanding of the complex process of virus replication. In this review, we will give an overview of the current state of knowledge of EV and HPeV replication and how this can be inhibited by small-molecule inhibitors.     

Effect of phosphorylation of MAPK and Stat3 and expression of c-fas and c-jun proteins on hepatocarcinogenesis and their clinical significance

AIM To study the effect of phosphorylation ofMAPK and Stat3 and the expression of c-fos andc-jun proteins on hepatocellular carcinogenesisand their clinical significance.METHODS SP immunohistochemistry was usedto detect the expression of p42/44MAPK, p-Stat3,c-fos and c-jun proteins in 55 hepatocellularcarcinomas (HCC) and their surrounding livertissues.RESULTS The positive rates and expressionlevels of p42/44MAPK, p-Stat3, c-fos and c-junproteins in HCCs were significantly higher thanthose in pericarcinomatous liver tissues (PCLT).A positive correlation was observed between theexpression of p42/44MAPK and c-fos proteins, andbetween p-Stat3 and c-jun, but there was nosignificant correlation between p42/44MAPK and p-Stat3 in HCCs and their surrounding livertissues.CONCLUSION The abnormalities of Ras/Rat/MAPK and JAKs/ Stat3 cascade reaction maycontribute to malignant transformation ofhepatocytes. Hepatocytes which are positive forp42/ 44MAPK, c-fos or c-jun proteins may bepotential malignant pre-cancerous cells.Activation of MAPK and Stat3 proteins may be anearly event in hepatocellular carcinogenesis.     

心电图、心电向量图与冠状动脉造影结果对比分析

目的:通过分析心电图(Electrocardiogram,ECG)和心电向量图(Vectorcardiogram,VCG)的改变与冠脉造影（CAG）结果进行对比,探讨ECG、VCG在冠状动脉病变中的诊断价值。方法: 选择2008年1月~2009年12月临床拟诊断为冠心病患者108例,行常规ECG、VCG检查,并于1周内进行CAG,对检查结果依据各自的诊断标准进行判定,以CAG为标准诊断法,利用四格表法,计算相关评价真实性的指标并进行比较。结果: ①VCG检测的灵敏度、特异度、准确度显著高于ECG(P<0.05,P<0．01)。②ECG、VCG阳性率与冠脉病变支数组间比较:在单支病变、双支病变中,VCG阳性率明显高于ECG(P<0.05),左主干或三支病变无统计学意义;组内比较:ECG组左主干或三支病变组较单支病变、双支病变阳性率高(P<0.05,P<0.01);VCG组左主干或三支病变组较单支病变阳性率高(P<0.05);与双支病变阳性率比较无统计学意义;③ECG、VCG阳性率与冠脉病变程度组间比较:冠脉病变狭窄50%～69%的VCG阳性率明显高于ECG (P<0.05),其他两组阳性率比较无统计学意义;组内比较:ECG组冠脉病变狭窄≥90%较50%～69%、70%～89%的阳性率高(P<0.05,P<0.01); VCG组狭窄≥90%较50%～69%阳性率高（P<0.01),其他无统计学意义。结论: VCG对冠心病检测价值显著高于ECG。     

Detection and characterization of the product of hydroethidine and intracellular superoxide by HPLC and limitations of fluorescence

Here we report the structural characterization of the product formed from the reaction between hydroethidine (HE) and superoxide (O(2)(.-)). By using mass spectral and NMR techniques, the chemical structure of this product was determined as 2-hydroxyethidium (2-OH-E(+)). By using an authentic standard, we developed an HPLC approach to detect and quantitate the reaction product of HE and O(2)(.-) formed in bovine aortic endothelial cells after treatment with menadione or antimycin A to induce intracellular reactive oxygen species. Concomitantly, we used a spin trap, 5-tert-butoxycarbonyl-5-methyl-1-pyrroline N-oxide (BMPO), to detect and identify the structure of reactive oxygen species formed. BMPO trapped the O(2)(.-) that formed extracellularly and was detected as the BMPO-OH adduct during use of the EPR technique. BMPO, being cell-permeable, inhibited the intracellular formation of 2-OH-E(+). However, the intracellular BMPO spin adduct was not detected. The definitive characterization of the reaction product of O(2)(.-) with HE described here forms the basis of an unambiguous assay for intracellular detection and quantitation of O(2)(.-). Analysis of the fluorescence characteristics of ethidium (E(+)) and 2-OH-E(+) strongly suggests that the currently available fluorescence methodology is not suitable for quantitating intracellular O(2)(.-). We conclude that the HPLC/fluorescence assay using HE as a probe is more suitable [corrected] for detecting intracellular O(2)(.-).     

Effects of sex and time of day on metabolism and excretion of corticosterone in urine and feces of mice

Non-invasive techniques to monitor stress hormones in small animals like mice offer several advantages and are highly demanded in laboratory as well as in field research. Since knowledge about the species-specific metabolism and excretion of glucocorticoids is essential to develop such a technique, we conducted radiometabolism studies in mice (Mus musculus f. domesticus, strain C57BL/6J). Each mouse was injected intraperitoneally with 740 kBq of 3H-labelled corticosterone and all voided urine and fecal samples were collected for five days. In a first experiment 16 animals (eight of each sex) received the injection at 9 a.m., while eight mice (four of each sex) were injected at 9 p.m. in a second experiment. In both experiments radioactive metabolites were recovered predominantly in the feces, although males excreted significantly higher proportions via the feces (about 73%) than females (about 53%). Peak radioactivity in the urine was detected within about 2h after injection, while in the feces peak concentrations were observed later (depending on the time of injection: about 10h postinjection in experiment 1 and about 4h postinjection in experiment 2, thus proving an effect of the time of day). The number and relative abundance of fecal [3H]corticosterone metabolites was determined by high performance liquid chromatography (HPLC). The HPLC separations revealed that corticosterone was extensively metabolized mainly to more polar substances. Regarding the types of metabolites formed, significant differences were found between males and females, but not between the experiments. Additionally, the immunoreactivity of these metabolites was assessed by screening the HPLC fractions with four enzyme immunoassays (EIA). However, only a newly established EIA for 5alpha-pregnane-3beta,11beta,21-triol-20-one (measuring corticosterone metabolites with a 5alpha-3beta,11beta-diol structure) detected several peaks of radioactive metabolites with high intensity in both sexes, while the other EIAs showed only minor immunoreactivity. Thus, our study for the first time provides substantial information about metabolism and excretion of corticosterone in urine and feces of mice and is the first demonstrating a significant impact of the animals' sex and the time of day. Based on these data it should be possible to monitor adrenocortical activity non-invasively in this species by measuring fecal corticosterone metabolites with the newly developed EIA. Since mice are extensively used in research world-wide, this could open new perspectives in various fields from ecology to behavioral endocrinology.     

大鼠骨髓间充质干细胞的分离培养和外源基因的导入

目的探讨绿色荧光蛋白基因转染骨髓间质干细胞的可行性。方法采用F icoll-PaqueTMP lus淋巴细胞分离液,根据细胞密度梯度原理,分离大鼠骨髓间充质干细胞(rM SC s)并进行体外原代培养和传代扩增,倒置相差显微镜观察细胞生长情况,免疫细胞化学法对其初步鉴定。流式细胞仪分析转染效率。结果原代和传代培养的细胞呈现梭形外观,具有较强的生长增殖能力;细胞均一表达CD44、CD54、CD106、CD29抗原。电穿孔法转染rM SC s转染率为32.8%±3%。结论采用比重为1.077 g/L的F icoll-PaqueTMP lus能分离获得大鼠骨髓间充质干细胞,经原代培养和传代培养能够迅速扩增。电穿孔法具有较高的介导外源基因表达于rM SC s的效率。