EPHA2-siRNA质粒对骨肉瘤细胞生物学行为的影响

目的探讨骨肉瘤细胞中EPHA2基因表达对细胞增殖、凋亡以及仿血管发生的影响。方法应用pSiliencer质粒构建靶向EPHA2的siRNA质粒;脂质体转染siRNA质粒人骨肉瘤细胞,Western blot在蛋白水平检测转染前后细胞基因表达情况;采用四甲基偶氮唑盐(MTT)法、流式细胞仪结合Annexin V-FITC和PI染色以及HE染色观察转染前后骨肉瘤细胞增殖、凋亡及仿血管发生情况。结果成功构建了针对EPHA2的siRNA表达质粒;将质粒转染入骨肉瘤后,EPHA2基因在蛋白表达水平下调;骨肉瘤细胞增殖能力下降,并发生了早期凋亡,骨肉瘤细胞的仿血管发生受到抑制。结论EPHA2参与了骨肉瘤细胞增殖、早期凋亡和仿血管发生;利用RNA干扰技术靶向EPHA2基因治疗可能为骨肉瘤治疗提供新方法。     

E2F陷阱DNA对人肺癌细胞中stathmin mRNA表达的影响及促进肿瘤细胞凋亡的作用

目的：观察转录因子E2F陷阱DNA对stathmin的表达影响及抑制肿瘤细胞增生情况.方法：采用脂质体LipofectamineTM2000将E2F Decoy ODNs转染入人肺癌A549细胞中,用RT-PCR检测转染细胞中stathmin基因mRNA表达水平变化,通过细胞生长曲线观察转染细胞的增殖能力,Tunel法观察转染细胞凋亡情况.结果：E2F Decoy ODNs被成功转染入肿瘤细胞中,RT-PCR检测结果显示实验组stathmin mRNA表达水平明显低于对照组,而且显著抑制了A549细胞的增殖,空白对照组无明显变化,Tunel凋亡染色可见凋亡细胞.结论：E2F Decoy ODNs能特异性下调stathmin mRNA表达,明显抑制A549细胞的增殖,为肿瘤的基因治疗提供了新的手段.     

VEGF特异siRNA对骨肉瘤细胞凋亡和仿血管发生的影响

目的：探讨VEGF特异siRNA在骨肉瘤细胞株（MG63）增殖、凋亡以及仿血管发生中的作用。方法：以pSilienc-er载体构建VEGF特异siRNA质粒pSilencer-VEGF siRNA,并转染骨肉瘤细胞MG63;将细胞分为pSilencer-VEGF siRNA质粒组（试验组）和空siRNA质粒组（对照组）,Western blotting在蛋白水平检测转染重组质粒后MG63细胞VEGF表达情况;MTT比色法、光镜、流式细胞仪结合Annexin V-FITC/PI染色和H-E染色观察质粒转染后骨肉瘤细胞增殖、凋亡和仿血管发生情况。结果：测序证实成功构建了针对VEGF的siRNA重组质粒。转染pSilencer-VEGF siRNA重组质粒后的试验组培养液中及骨肉瘤细胞内VEGF蛋白表达下降;转染后48、72、96h骨肉瘤细胞的增殖抑制率分别为41.67%、43.92%、35.32%,并发生了早期凋亡,凋亡率为28.27%。转染pSilencer-VEGF siRNA重组质粒的骨肉瘤细胞未见仿血管发生,转染空质粒的对照组骨肉瘤细胞则有仿血管发生。结论：RNA干扰VEGF基因能抑制骨肉瘤细胞增殖,促进骨肉瘤细胞早期凋亡,干扰骨肉瘤细胞仿血管发生,为临床基因治疗骨肉瘤提供了新的思路。     

内皮抑素基因对裸鼠移植骨肉瘤的抑制作用

目的：探讨内皮抑素（endostatin,ES）基因对裸鼠骨肉瘤细胞UMR106移植瘤的抑制作用。方法：携带ES基因重组质粒体外扩增后,应用脂质体法转染骨肉瘤细胞UMR106,Zeocin抗性筛选得到ES-UMR106细胞。MTT法观察ES基因对肿瘤细胞增殖的影响,ELISA法检测转染后肿瘤细胞的ES分泌情况。MTT法观察ES基因对血管内皮细胞增殖能力的影响。应用ES-UMR106和UMR106细胞制作裸鼠皮下移植瘤模型,观察两组动物移植瘤生长情况、瘤组织的病理变化及肺转移的情况。结果：ES基因转染不影响UMR106细胞的增殖能力;ES-UMR106细胞可表达有生物活性的ES,转染后48hES在培养液中超过350ng/ml。ES-UMR106细胞分泌的ES可明显抑制血管内皮细胞增殖。与UMR106细胞相比,ES-UMR106细胞在裸鼠接种的移植瘤生长速度缓慢、包膜完整,病理组织学显示瘤体内血管稀少,肿瘤细胞广泛坏死;UMR106细胞移植瘤裸鼠肺组织出现转移灶（2/8）,ES-UMR106细胞移植瘤裸鼠无肺转移灶。结论：携带ES基因重组质粒转染骨肉瘤UMR106细胞后可抑制该骨肉瘤细胞移植瘤的生长和转移。     

B7-1基因转染对骨肉瘤细胞生物学行为的影响

目的:研究B7-1真核表达载体pcDNA3-B7-1转染对骨肉瘤细胞株LM8的生物学行为的影响。方法:用脂质体(lipofectamine)介导B7-1基因和空载体pcDNA3转染LM8细胞,G418筛选得到抗性克隆,分别命名为LM8/B7-1和LM8/pcDNA3,用聚合酶链反应(RT-PCR)和流式细胞仪(FCM)鉴定转染基因的表达,采用四甲基偶氮唑蓝微量酶反应比色法(MTT)和FCM检测细胞体外增殖活性,并观察转染细胞在C3h小鼠体内致瘤能力。结果:RT-PCR和FCM显示B7-1基因在骨肉瘤细胞株LM8中呈高表达,LM8/B7-1体外增殖活性与LM8/pcDNA3和LM8细胞差异并无显著性(P>0.05),但LM8/B7-1的致瘤能力显著下降(P<0.01)。结论:B7-1基因对骨肉瘤细胞的体内增殖能力产生明显抑制作用,可以作为骨肉瘤基因治疗的理想目的基因之一。     

靶向survivin的siRNA对骨肉瘤细胞MG63的抑制作用

目的：探讨针对人survivin基因的siRNA对骨肉瘤细胞MG63的体内外抑制作用。方法：合成survivin基因的RNA干涉（RNA interferance,RNAi）特异性片段,构建survivin特异性的RNA干涉载体pSiS,转染MG63细胞,G418筛选稳定转染的细胞系。细胞计数检测细胞生长情况;Western blotting检测细胞中survivin蛋白表达的变化;通过Annexin V法染色和流式细胞术检测细胞凋亡;观察裸鼠皮下MG63移植瘤的形成。结果：成功构建了survivin基因siRNA真核表达载体pSiS,获得了稳定转染的细胞MG63/pSiS。与MG63、MG63/pSi（空质粒对照细胞）相比,MG63/pSiS细胞生长曲线十分平缓,差异有统计学意义（P〈0.01）;Western blotting显示,MG63/pSiS细胞中survivin蛋白表达减少,细胞凋亡率增加（P〈0.01）。MG63/pSiS移植瘤形成明显受到抑制。结论：Survivin特异性siRNA可明显促进骨肉瘤细胞MG63的凋亡,抑制该肿瘤细胞体外生长和体内移植成瘤。     

软骨肉瘤相关基因Sox9(siRNA)表达质粒的构建鉴定以及对肿瘤细胞生长和凋亡的影响

目的: 利用小干扰阻断目的基因的原理将构建的目的基因Sox9的pSilencer3,1-H1 neo siRNA(small interfering RNA)表达质粒转染人体软骨肉瘤细胞HTB-94,观察目的基因被阻断后肿瘤细胞目的基因的表达、肿瘤细胞生长和凋亡所受到的影响。 方法: 设计并合成Sox9(siRNA),鉴定后将其转染HTB-94肿瘤细胞,观察肿瘤细胞的Sox9基因的mRNA和蛋白表达的变化,以及被转染肿瘤细胞的生长曲线和肿瘤细胞凋亡的情况。 结果: Sox9(siRNA)的插入片段测序结果与合成的siRNA结果一致,被转染的HTB-94Sox9基因的mRNA的表达量下降了35.4%,蛋白的表达量下降了31.3%;Sox9(siRNA)转染HTB-94细胞24h和96h的光吸收值分别为0.146±0.037和0.412±0.036,而正常对照细胞组两个同样时间段的光吸收值分别为0.152±0.0367和0.607±0.029。其中细胞生长增殖速度的差异为32.0%,肿瘤细胞的生长明显受到抑制;Sox9(siRNA)转染HTB-94细胞的干扰组细胞凋亡率为39.2%;而未经干扰的HTB-94肿瘤细胞的细胞凋亡率为0.1%。 结论: 经过设计合成的Sox9(siRNA)表达质粒可以稳定转染人体软骨肉瘤细胞HTB-94肿瘤细胞,被Sox9(siRNA)表达质粒转染的人体软骨肉瘤细胞HTB-94肿瘤细胞Sox9基因的mRNA和蛋白的表达都受到抑制,同时肿瘤细胞的生长繁殖也受到明显抑制,肿瘤细胞的凋亡明显增加。     

反义c-myc重组腺病毒的构建及其抗骨肉瘤细胞的作用

背景与目的:c-myc原癌基因在细胞的增殖调节中发挥重要作用,研究表明c-myc在骨肉瘤中常常扩增和过表达,而且具有促进细胞转化和诱导转移的特性。本文构建表达反义c-myc的重组腺病毒,并探讨其对不同p53基因型的骨肉瘤细胞系MG-63(P53缺失型)、U2OS(p53野生型)的影响。方法:应用基因重组技术构建表达反义c-myc的重组腺病毒(Ad-As-c-myc),并在体外转染MG-63、U2OS细胞,采用蛋白免疫印迹(Westernblot)、吖啶橙染色、RT-PCR、流式细胞仪(FCM)等方法检测或观察其对细胞c-mycmRNA表达、瘤细胞体外增殖、凋亡及细胞周期的影响。结果:成功构建Ad-As-c-myc,滴度可达2×109pfu/ml,体外转染MG-63、U2OS细胞后可明显抑制细胞的体外增殖,而且对携带野生型p53的U2OS更敏感。Ad-As-c-myc转染48h后可降低c-mycmRNA表达。吖啶橙染色及FCM检测证实,转染Ad-As-c-myc可诱导骨肉瘤细胞凋亡,细胞周期分析显示转染Ad-As-c-myc的MG-63细胞出现G2/M期阻滞,而U2OS细胞出现G1期阻滞。结论:腺病毒介导反义的c-myc能以p53依赖或非依赖性途径诱导骨肉瘤细胞凋亡,并抑制骨肉瘤细胞的增殖。     

促凋亡基因PDCD5在骨肉瘤U2-OS细胞表达及对其促凋亡作用的研究

目的:观察外源性PDCD5基因对骨肉瘤细胞系U2-OS的促凋亡作用。方法:扩增重组质粒PCI-neo-PDCD5,采用脂质体转染的方法,将PDCD5基因转染骨肉瘤细胞U2-OS,RT-PCR检测转染后表达情况;撤除血清培养16h后,四甲基偶氮唑盐MTT法检测目的基因转染后细胞的增殖情况;An-nexinV-染色流式细胞仪检测细胞凋亡;蛋白质印迹法分析凋亡通路。结果:转染骨肉瘤细胞U2-OS后,RT-PCR检测到PDCD5的表达,MTT实验发现撤除血清后转染重组质粒组细胞的增殖被明显抑制。于转染空载体和对照组细胞相比,存活细胞明显减少,P<0.001。AnnexinV染色,流式细胞仪检测可见明显的凋亡细胞,与转染空质粒组(凋亡率为1.47%)相比,其凋亡率为10.28%。经PDCD5处理的细胞中,Bcl-2、Caspase-3和Caspase-9的表达与对照组比较,差异均有统计学意义。结论:PDCD5基因可以在转染的骨肉瘤细胞系U2-OS细胞中表达,并在撤出血清因素的诱导作用下可显著抑制转染细胞的生长,并通过线粒体激活途径发挥促凋亡作用并诱导细胞发生凋亡。     

siRNA干扰STAT3基因对食管癌Eca-109细胞生物学特性的影响

目的:探讨RNA干扰技术沉默STAT3信号传导通路对人食管癌Eca-109细胞增殖、细胞周期和凋亡的影响.方法:针对人STAT3基因mRNA序列设计合成3对编码小干扰RNA(siRNA)的DNA模板,将其连入pRNAT-U6.1/neo质粒中,构建STAT3-siRNA表达载体,稳定转染人食管癌Eca-109细胞,利用RT-PCR、Western blot技术分别检测转染细胞中STAT3基因mRNA和蛋白的表达,MTT实验、流式细胞技术检测转染细胞的增殖、细胞周期和凋亡变化情况.结果:成功构建STAT3-siRNA表达载体,经测序鉴定正确.RT-PCR和Western blot结果显示,STAT3-siRNA3表达载体明显抑制了人食管癌Eca-109细胞中STAT3基因mRNA和蛋白的表达,与对照组相比,差异有统计学意义(P＜0.01).MTT实验显示,稳定转染siRNA后,siRNA3实验组细胞的增殖能力明显下降,细胞生长抑制卒为35.68%,较对照组明显升高,差异有统计学意义(P＜0.01).流式细胞技术显示,siRNA3实验组出现了细胞周期阻滞和细胞凋亡,细胞周期阻滞于G_0/G_1期,细胞凋亡率为13.26%,明显高于对照组,差异有统计学意义(P＜0.01);结论:RNA干扰技术沉默STAT3基因可以有效地抑制STAT3基因的表达,进而抑制人食管癌Eca-109细胞的增殖,引起细胞周期G_0/G_1期阻滞,促进其凋亡.     

Silencing stathmin gene expression by survivin promoter-driven siRNA vector to reverse malignant phenotype of tumor cells

Stathmin gene overexpression has been shown to play an important role in maintenance of malignant phenotype in tumor cells, and the blocking efficacy and tumor specificity of this target has been concerned in clinical trails. In this report, we designed survivin promoter-driven siRNA eukaryotic expression vector that expressed the small interfering RNA targeting stathmin gene to selectively knock down the stathmin gene expression in two different kinds of tumor cell lines while sparing normal cell lines. The therapeutic potential of this recombinant vector was tested in human cervical cancer Hela cells and osteosarcoma SSOP-9607 cells, and in human umbilical vein endothelial cell line ECV304 cells as control. The siRNA vector- transfected Hela cells and SSOP-9607 cells revealed marked inhibition of stathmin expression and a dramatic growth inhibition comparing with ECV304 cells, parental-vector transfected cells and untransfected cells. Cell cycle analysis of siRNA vector transfected tumor cells by Flow Cytometry showed G(2)/M phase block, while morphologic analysis by TURNEL staining method showed marked increase of apoptosis. Our study indicates that survivin gene promoter-driven stathmin siRNA expression vector may have potential use in tumor gene therapy with targeted tumor gene silencing effect.     

Overexpression of stathmin1 in the diffuse type of gastric cancer and its roles in proliferation and migration of gastric cancer cells

Background:

Stathmin1 is a microtubule-regulating protein that has an important role in the assembly and disassembly of the mitotic spindle. The roles of stathmin1 in carcinogenesis of various cancers, including prostate and breast cancer, have been explored. However, its expression and roles in gastric cancer have not yet been described.

Methods:

Stathmin1 expression in paraffin-embedded tissue sections from 226 patients was analysed by immunohistochemistry. Roles of stathmin1 were studied using a specific small interfering RNA (siRNA).

Results:

The expression of stathmin1 was positively correlated with lymph node metastasis, TNM stages and vascular invasion, and negatively with recurrence-free survival, in the diffuse type of gastric cancer. The median recurrence-free survival in patients with a negative and positive expression of stathmin1 was 17.0 and 7.0 months, respectively (P=0.009). When the expression of stathmin1 was knocked down using siRNA, the proliferation, migration and invasion of poorly differentiated gastric cancer cells in vitro were significantly inhibited. Moreover, stathmin1 siRNA transfection significantly slowed the growth of xenografts in nude mice.

Conclusion:

These results suggest that stathmin1 can be a good prognostic factor for recurrence-free survival rate and is a therapeutic target in diffuse-type gastric cancer.     

Stable RNA interference of hexokinase II gene inhibits human colon cancer LoVo cell growth in vitro and in vivo

The purpose of this study is to investigate the effect of silencing hexokinase II (HK II) gene with RNA interference (RNAi) technique on colon cancer LoVo cell proliferation in vitro and in vivo. A short hairpin RNA (shRNA) eukaryotic expression vector against HK II gene was constructed, named as plasmid pGenesil-1-HK II, and transfected into LoVo cells. The expression of HK II gene was detected by RT-PCR and Western blot analysis respectively. Then, tumor colony formation was observed, and cell cycle was also assessed by flow cytometry and the contents of intracellular adenosine triphosphate (ATP) by high performance liquid chromatography (HPLC). Furthermore, LoVo cells were injected subcutaneously into nude mice. After a 4-week follow-up period, the sizes and weights of tumors were measured. Moreover, the expression of Ki67 protein was observed by immunohistochemical technique, and cell apoptosis by terminal deoxynucleotidyl transferase mediated nick end labeling (TUNEL). Consequently, the expression of HK II gene was efficiently blocked by RNAi. Downregulation of HK II gene expression significantly suppressed cloning efficiency and cell cycle of LoVo cell in vitro and tumor growth in vivo. Compared with untransfected LoVo cells, LoVo cells transfected with pGenesil-1-HK II plasmids showed significant decrease in the cellular ATP contents and Ki67 expression, and obvious increase in the apoptosis indexes. Our results suggest that HK II gene can act as a crucial therapeutic target for slowing colon cancer growth.     

人微管不稳定蛋白基因真核表达载体的构建与表达及对食管癌细胞的作用

目的 构建人微管不稳定蛋白基因(stathmin)真核表达载体,研究其对食管癌细胞EC9706的作用.方法 采用逆转录聚合酶链反应(RT-PCR)扩增stathmin cDNA,克隆至pMDl8-T载体并酶切鉴定后,亚克隆至pEGFP-C2真核表达载体.将测序鉴定正确的重组载体和空载体经脂质体转染EC9706细胞,G418筛选获得稳定转染的细胞株.通过荧光显微镜观察转染细胞荧光蛋白的表达,采用Western blot检测转染细胞中增强型荧光蛋白(EGFP)和stathmin融合蛋白的表达.选取稳定转染的细胞株,采用细胞计数法绘制细胞生长曲线,采用流式细胞仪分析细胞的增殖状态,平板克隆形成实验、裸鼠移植瘤实验分析转染细胞成瘤性.结果 RT-PCR扩增获得450 bp的cDNA编码序列;克隆至pMD18-T载体,经酶切鉴定后获反向插入质粒;亚克隆至pEGFP-C2载体后,经酶切与测序鉴定,重组载体pEGFP-stathmin构建成功.重组载体和空载体转染EC9706细胞,G418筛选获得稳定转染的细胞株.通过荧光显微镜观察到,转染细胞中呈现绿色荧光;经Western blot证实,重组载体表达46 000的融合蛋白.与空载体转染细胞相比,转染重组载体的EC9706细胞形态变大,增殖速度减慢,细胞分裂阻滞于G2/M期,细胞克隆形成数减少,裸鼠体内成瘤性降低(P＜0.05).结论 构建的真核表达载体pEGFP-stathmin在食管癌EC9706细胞中能够稳定表达,并抑制肿瘤细胞的增殖和成瘤性.     

下调TSG101基因表达对胰腺癌细胞系PANC-1增殖的影响

目的：研究通过siRNA下调TSG101的表达对胰腺癌细胞系PANC-1生长、增殖及细胞周期的影响。方法：将合成的TSG101 siRNA片段插入至带有绿色荧光蛋白基因（GFP）的pGenesil-1质粒中,用lipo-fectamine 2000将质粒转入胰腺癌细胞系PANC-1后,Western blot鉴定siRNA对TSG101蛋白干扰效率。然后用MTT、流式细胞术检测TSG101下调的细胞生长、增殖能力及细胞周期的变化。结果：TSG101 siRNA有效下调其在胰腺癌细胞系PANC-1中的表达,下调TSG101基因的表达后显著抑制了PANC-1细胞的生长、增殖能力。与随机对照siRNA及阴性对照细胞相比,MTT分析显示有效转染TSG101 siRNA的细胞从第4天开始增殖能力明显下降（P〈0.05）,流式细胞术分析示细胞周期阻滞在G1期,增殖指数（PI）下降（P〈0.05）。结论：下调TSG101在胰腺癌细胞系PANC-1表达后能够导致细胞周期的阻滞并有效抑制细胞生长、增殖。利用RNA干涉技术下调内源性TSG101表达有望成为一种有效的胰腺癌基因治疗方法。     

Stathmin expression in glioma-derived microvascular endothelial cells: a novel therapeutic target

The purpose of this study was to investigate stathmin expression and its mechanisms of action in GDMEC. Microvascular endothelial cells were isolated from human gliomas (n=68) and normal brain specimans (n=20), and purified by magnetic beads coated with anti-CD105 antibody. The expression of stathmin mRNA and protein were detected by RT-PCR and western blotting, respectively. Stathmin expression was silenced by application of specific siRNA in high grade GDMEC. The proliferation, apoptosis and invasion behavior of GDMEC were investigated. The stathmin positive rate of endothelial cells in normal brain, grade I-II glioma and grade III-IV glioma was 20, 66 and 95.5%, respectively (P<0.05). When cells were treated with siRNA to silence stathmin, cell viability was reduced, the apoptosis rate increased and the migration of vascular endothelial cells was suppressed significantly (P<0.05). Down-regulation of stathmin suppressed neoangiogenesis of glioma and provides a potential target for glioma treatment.     

反义Stathmin基因对胃癌细胞生长影响的观察

目的探讨反义Stathmin基因的核酸（antisense of stathmin ologodeoxynucleotides,ASODN）对人胃癌细胞系生长的影响及对裸鼠体内肿瘤生长的作用。方法免疫组化检测2010-01-2013-06山东省千佛山医院40例胃癌标本中癌组织及癌旁组织中Stathmin的表达;以人胃癌MCG803细胞系为靶细胞,分为ASODN转染细胞组、SODN转染组及未转染组3组,ASODN为阻断剂,观察ASODN对胃癌细胞的增殖的影响;40只腹腔种植胃癌细胞的裸鼠随机分为2组,观察转染ASODN在裸鼠体内对肿瘤生长的影响。结果Stathmin在胃癌组织中的阳性表达率为77.5%（32/40）,显著高于癌旁组织的32.5%（13/40）,差异有统计学意义,P〈0.001;未转染组及SODN转染组胃癌细胞倍增时间（20h）明显短于ASODN转染组（27h）;随时间进展,ASODN转染组细胞增殖能力均受抑制,差异有统计学意义,P〈0.001;转染ASODN胃癌细胞裸鼠的肿瘤组织体积平为（2.98±0.12）mm^3,小于未转染ASODN组肿瘤组织（7.61±0.21）mm^3,P=0.036。结论 ASODN对胃癌细胞的生长有抑制的作用,有望成为胃癌治疗的新靶点,以提高胃癌患者的生存时间。     

CtBP1基因shRNA真核表达载体的构建及其干扰效果的初步鉴定

目的：构建C-末端结合蛋白-1（CtBP1）基因RNA干扰（RNAi）的真核表达载体,转染人子宫内膜癌耐药细胞株B-MD-C1（ADR＋/＋）,初步鉴定其干扰效果。方法：以人CtBP1基因为靶基因,以pGenesil-1质粒为载体,根据GenBank数据库提供的CtBP1基因核苷酸序列,选择设计两条siRNA干扰序列,将带9个碱基茎环结构的干扰序列插入带有绿色荧光蛋白（EGFP）基因、卡那霉素（Kanr）抗性基因及U6启动子的真核表达载体pGenesil-1中,构建针对CtBP1基因的shRNA真核表达载体,转化大肠杆菌DH5α菌株,提取质粒,进行限制性内切酶酶切鉴定和测序分析。确认载体构建成功后,用脂质体LipofectamineTM2000将重组质粒瞬时转染人子宫内膜癌耐药细胞株B-MD-C1（ADR＋/＋）,在荧光显微镜下观察绿色荧光蛋白表达,计数转染细胞数,计算转染效率,RT-PCR法检测载体对CtBP1基因的表达抑制效果。结果：构建针对CtBP1基因的pGenesil-1-CtBP1小发夹RNA（pGenesil-1-CtBP1-shRNA）,经限制性内切酶酶切、PCR和DNA测序证实与设计完全一致;在荧光显微镜下观察到B-MD-C1（ADR＋/＋）细胞表达绿色荧光蛋白（EGFP）,证实重组质粒己转染入细胞,转染效率达到60%-70%;RT-PCR结果显示B-MD-C1（ADR＋/＋）细胞中CtBP1基因被特异抑制,基因表达抑制率达40%以上,与转染试剂对照组、空白对照组和阴性序列对照组间的差异均具有统计学意义（P均〈0.05）。结论：成功构建CtBP1基因的shRNA表达载体,可以有效抑制B-MD-C1（ADR＋/＋）细胞上CtBP1基因表达。为进一步研究CtBP1基因功能进而逆转肿瘤的多药耐药奠定基础。     

Stathmin基因在人成骨肉瘤细胞中的表达及意义

stathmin作为细胞信号转导分子在细胞分化及恶性肿瘤发生、发展上发挥重要作用。本研究旨在探讨Stathmin基因在人成骨肉瘤细胞中的表达,并探讨阻断其表达对该肿瘤细胞的生物学行为的影响。方法：RT-PCR及原位杂交法检测2个人成骨肉瘤细胞系及45例人成骨肉瘤组织中Stathmin基因表达情况;以高表达Stathmin基因的人成骨肉瘤细胞系SOSP-9607为靶细胞、反义Stathmin(ASODN)为阻断剂,通过MTT实验观察ASODN对该细胞系的生长抑制作用,并用流式细胞仪分析其对细胞增殖周期的影响。