MAT1-siRNA体外转染抑制胰腺癌细胞增殖和侵袭能力的研究

目的:观察siRNA沉默MAT1基因对胰腺癌细胞增殖和侵袭能力的影响,探讨MAT1基因作为胰腺癌基因治疗标靶的可行性。方法:在脂质体介导下将MAT1基因序列特异性siRNA体外转染人胰腺癌BxPC-3细胞,采用RT-PCR和W estern印迹法分析MAT1基因的表达,锥虫蓝染色计数法和Boyden小室模型分别测定细胞的增殖和体外侵袭能力变化。结果:与对照各组相比,实验组BxPC-3细胞MAT1 mRNA和蛋白在一定时间内均表达下调,其中mRNA表达在24 h和48 h分别下调达55.2%和64.3%(P<0.01);细胞体外增殖和侵袭能力均明显受抑,差异具统计学显著性(P<0.01)。结论:针对MAT1基因的siRNA可抑制胰腺癌细胞的增殖和侵袭能力,MAT1可能是胰腺癌基因治疗的靶点。     

组蛋白去乙酰化酶1siRNA转染对Hela细胞的抑制

Objective:To investigate the anti-proliferative effect of histone deacetylases-1(HDAC-1)knockdown in Hela cells.Methods:The HDAC-1 protein was knockdowned using siRNA.The expression of HDAC-1 was detected by Western blotting.Apoptosis was assessed by flow cytometry.The inhibition of cell growth was assesses by MTT assay.Result:HDAC-1 siRNA knockdowned the expression of HDAC-1 protein.HDAC siRNA inhibited lhe proliferation of Hela cells.HDAC-1 siRNA induced apoptosis.Conclusion:HDAC-1 siRNA may inhibit the growth of Hela cells by inducing apoptosis.     

RNA干扰抑制Snail表达对A549细胞上皮-间充质转分化及体外侵袭的影响

目的:研究用RNA干扰(RNA interference,RNAi)技术抑制转录因子Snail表达后,对人肺腺癌A549细胞上皮-间充质转分化表型和体外侵袭能力的影响.方法:构建能表达针对Snail的小干扰RNA(Small interfering RNA,siRNA)的RNA干扰载体(Snail siRNA vector)和表达不针对任何已知mRNA的siRNA的阴性对照RNA干扰载体(control siRNA vector),分别转染A549细胞,新霉素抗性筛选得到Snail表达受抑制的A549-siSnail细胞和Snail表达未受影响的A549-siControl细胞.针对非转染(A549-nontransfection)、A549-siSnail、A549-siControl三组细胞,分别采用RT-PCR和Western blot技术检测Snail、α-平滑肌肌动蛋白(α-SMA)和E-钙粘素表达,用Boyden chamber模型检测细胞侵袭能力.结果: A549-nontransfection组:Snail和α-SMA表达强阳性,E-钙粘素表达弱阳性；A549-siSnail组:和A549-nontransfection组相比,Snail和α-SMA表达显著减弱(P<0.01),E-钙粘素表达显著增强(P<0.01),Boyden chamber穿膜细胞数显著减少(P<0.01)；A549-siControl组:Snail、α-SMA和E-钙粘素表达,及Boyden chamber穿膜细胞数和A549-nontransfection组无显著差异(P>0.05).结论: 通过RNA干扰阻滞Snail表达能有效地抑制A549细胞上皮-间充质转分化及体外侵袭能力.Snail可能在肺腺癌上皮-间充质转分化及侵袭过程中扮演重要角色,抑制Snail表达可能成肺腺癌治疗的可行策略.     

体外RNA干扰抑制Ezrin表达对骨肉瘤细胞增殖和侵袭的影响

背景与目的:细胞膜-细胞骨架联接蛋白(埃兹蛋白,Ezrin)参与了许多细胞的功能,包括细胞黏附、细胞运动以及细胞的生存.最近的许多研究表明Ezrin参与调控了肿瘤的侵袭与转移.然而,在骨肉瘤中,Ezrin所扮演的重要角色还没有被很清晰的阐明.本研究拟探讨Ezrin蛋白对人骨肉瘤细胞增殖和侵袭能力的影响.方法:以骨肉瘤MG-63细胞系为研究对象,针对Ezrin编码基因设计小干扰RNA片段,重组其shRNA(short hairpin RNA)表达载体转染入细胞,筛选稳定表达的克隆,逆转录聚合酶链反应(RT-PCR)和免疫印迹(Western-Blot)方法检测转染后Ezrin的mRNA和蛋白的表达水平,四甲基偶氮唑蓝(MTT)法检测增殖能力,流式细胞术检测细胞周期,Transwell法检测侵袭能力的变化.结果:RT-PCR和Western blot检测显示shRNA对Ezrin在基因和蛋白水平均有显著下调作用.骨肉瘤细胞生长速度减慢,处于分裂期的细胞比例有明显的下降,由25.05%下降到18.36%,而G1期细胞比例则由60.57%上升到67.65%.穿过人工基底膜的细胞数量也明显减少,由35.9±5.6减少为22.5±2.8(P＜0.01).结论:Ezrin在骨肉瘤的增殖和侵袭过程中发挥有重要作用,可能成为抑制肿瘤增殖和转移的关键性分子.     

Livin靶向siRNA诱导大肠癌细胞调亡的作用

Objective:To construct siRNA recombinant expression vector targeting Livin gene and observe the apoptosis induction effecl of it in human colon cancer cells.Methods:SiRNA recombinant expression vector targeting Livin gene was constructed and transfected into human colon cancer cell.The effect of siRNA recombinant expression vector was detected by RT-PCR,Westem blot,MTT reduction assay and flow cytometry.Results:It was confirmed by restriction endonuclease and sequence analysis that siRNA recombinant expression vector targeting Livin gene was constructed successfully.Inhibition ratio of Livin siRNA at mRNA and protein levels were 30.18% and 28.88%.The growth of cancer cells was inhibited significantly and the apoptotic ratio was 13.36±1.45%.Conclusion:The siRNA recombinant expression vector targeting Livin gene has been constructed successfully.It not only can inhibit the expression of Livin gene but also can induce apoptosis in human colon cancer cells remarkably.     

靶向IGFIR的siRNA抑制人肝癌细胞SMMC7721裸鼠移植瘤的实验研究

Objective:To investigate the effect of insulin-like growth factor 1 receptor (IGF1R) small interfering RNA (siRNA)on the growth of human liver cancer SMMC7721 cell xenograft in nude mice.Methods:siRNAtargeting IGF1R was designed,and plasrnid SMMC7721-1GF1R-siRNA was constructed and transfected into SMMC7721 cells (SMMC7721-1GF1R-siRNAcells); the cells transfected with SMMC7721-1GF1 R-mutation (SMMC7721-1GF1 R-mutation cells) were used as negative control,and untransfected cells as empty control.Stable cell clones were screened by G418,and transplanted into nude mice to establish cancer xenograft.Tumor growth was monitored.Tumor morphology was observed with HE staining.The expression of IGF1R protein in tumor tissues was detected by Western blot.Microvessel density (MVD) in tumor tissues was detected by SP immunohistochemistry.Cell apoptosis was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assay.Results:The tumor volume was significantly smaller in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1R-mutation and SMMC7721 groups (P＜0.05).Necrosis and cell apoptosis were found in SMMC7721-1GF1R-siRNA group.The expression of tGF1R protein was significantly lower in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1R-mutation and SMMC7721 groups (P＜0.05).MVD was significantly lower in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1R-mutation and SMMC7721 groups (11.3±4.4 vs.36.7±7.6 and 28.4±6.5,P＜0.05).The apoptosis rate of tumor cells was significantly higher in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1 R-mutation and SMMC7721 groups [(50.2±6.4)% vs.(5.4±1.0)% or (6.0±2.1)%,P＜0.05].Conclusion:1GF1R siRNA can inhibit the growth of SMMC7721 cell xenograft in nude mice.     

表达对胰腺癌CFPAC-1细胞增殖和凋亡的影响

目的:应用慢病毒介导的RNA干扰技术,靶向沉默人胰腺癌CFPAC-1细胞中的EphB2基因的表达,观察EphB2对CFPAC-1细胞增殖和凋亡的影响。方法:构建靶向EphB2基因的siRNA干扰质粒,通过Lipofectamine^TM2000将干扰质粒转染进293T细胞,筛选出能有效抑制EphB2蛋白表达的干扰序列。构建含有效序列的慢病毒载体pLentiGFP-EphB2,感染CFPAC-1细胞,筛选出稳定干扰EphB2蛋白表达的CFPAC-1细胞系。定量PCR、Western blotting检测CFPAC-1细胞中EphB2mRNA和蛋白的表达,CCK8法和流式细胞术检测EphB2下调对CFPAC-1细胞增殖和凋亡的影响。结果:成功构建了EphB2慢病毒干扰载体pLentiGFP-EphB2,获得稳定转染pLentiGFP-EphB2的CFPAC-1细胞（CFPAC-1 EphB2 RNAi）。CFPAC-1EphB2 RNAi细胞中EphB2 mRNA和蛋白表达较空载体组显著降低,EphB2 mRNA的沉默效率为63%。与空载体组和未转染组相比,pLentiGFP-EphB2感染显著促进CFPAC-1细胞的增殖（1.89±0.17vs1.63±0.13、1.71±0.22,P<0.05）,抑制细胞的凋亡[（7.02±1.27）%vs（13.37±1.89）%、（15.71±2.35）%,P<0.05]。结论:pLentiGFP-EphB2可有效下调胰腺癌CFPAC-1细胞中EphB2的表达,促进CFPAC-1细胞增殖和抑制其凋亡。     

沉默MTA1表达对胃癌SGC7901细胞增殖和侵袭能力的影响

目的:观察转移相关基因1（MTA1）基因沉默对人胃癌细胞SGC7901增殖和迁移侵袭能力的影响,探讨 MTA1基因在胃癌发生发展中的作用。方法:利用脂质体法将靶向MTA1的小分子干扰 RNA（siRNA） 转染到胃癌细胞株 SGC7901中。运用Real time PCR 和Western blot 技术检测SGC7901细胞内MTA1的 mRNA和蛋白表达水平。CCK-8法检测细胞增殖能力,Transwell小室实验观察细胞迁移和侵袭能力。结果:MTA1 siRNA 可有效抑制SGC7901细胞MTA1基因在 mRNA 和蛋白水平上的表达（P﹤0.01）。CCK-8实验表明MTA1 siRNA 转染后细胞增殖不受影响;Transwell小室实验表明细胞迁移和侵袭能力明显下降。结论:沉默MTA1表达可抑制胃癌细胞株 SGC7901迁移和侵袭,而不影响细胞增殖。MTA1在胃癌侵袭转移过程中可能发挥重要作用。     

靶向XIAP的siRNA抑制结肠癌LoVo细胞体内外的增殖

目的：研究siRNA干扰X连锁凋亡抑制蛋白（Xlinked inhibitor of apoptosis protein, XIAP）基因表达对结肠癌细胞LoVo体内外增殖的影响。方法：构建XIAP真核表达干扰载体pSil2.1shXIAP1和pSil2.1shXIAP2,脂质体转染结肠癌细胞株LoVo,G418筛选出稳定转染LoVoshXIAP2细胞。RTPCR和Western blotting方法检测XIAP mRNA和蛋白的表达。MTT法和平板克隆形成实验检测LoVo细胞的增殖;流式细胞仪检测细胞的凋亡;裸鼠移植瘤模型观察XIAP表达下调对结肠癌体内增殖活性的影响。结果：LoVoshXIAP2细胞中XIAP mRNA和蛋白表达水平均显著下调。相对于对照组细胞,LoVoshXIAP2细胞的增殖和克隆形成率显著降低(P<0.01）,凋亡率显著增加（P<0.01）。 LoVoshXIAP2移植瘤组织中XIAP蛋白表达明显下调,LoVoshXIAP2移植瘤生长显著抑制（均P<0.05）。结论：pSil2.1shXIAP2能够抑制结肠癌LoVo细胞中XIAP蛋白的表达,抑制LoVo细胞体内外的增殖,有望成为结肠癌免疫治疗的新手段。     

siRNA沉默雄激素受体对人结肠癌HCT-8细胞增殖、迁移及侵袭的影响

目的:利用小干扰RNA(siRNA)沉默人结肠癌HCT-8细胞中雄激素受体(androgen receptor,AR)的表达,观察AR敲除对癌细胞增殖、迁移和侵袭能力的影响,初步探讨AR在结肠癌中的功能.方法:利用qRT-PCR和Western blot检测HCT-8细胞及正常人肠上皮细胞中AR的表达;siRNA转染HCT-8细胞沉默AR表达,利用qRT-PCR和Western blot检测转染效率;流式细胞术检测沉默AR后对HCT-8细胞周期的影响;CCK-8法检测沉默AR后对HCT-8细胞增殖的影响;Transwell实验检测沉默AR后对HCT-8细胞迁移及侵袭的影响.结果:AR在人结肠癌HCT-8细胞中高表达;siRNA能有效沉默HCT-8细胞中AR的mRNA及蛋白的表达.与对照组相比,沉默AR表达能够明显抑制HCT-8细胞的增殖、迁移和侵袭能力.结论:AR在人结肠癌HCT-8中高表达并能够促进癌细胞的增殖、迁移和侵袭能力.     

MicroRNA-218 inhibits cell invasion and migration of pancreatic cancer via regulating ROBO1

miRNA-218 is a highlighted tumor suppressor and its underlying role in tumor progression is still unknown. Here, we restored the expression of miRNA-218 in pancreatic cancer to clarify the function and potent downstream pathway of miRNA-218. The expressions of both miRNA-218 and its potent target gene ROBO1 were revealed by RT-PCR and western blotting analysis. Transfection of miRNA-218 precursor mimics and luciferase assay were performed to elucidate the regulation mechanism between miRNA-218 and ROBO1. Cells, stably expressing miRNA-218 followed by forced expression of mutant ROBO1, were established through co-transfections of both lentivirus vector and plasmid vector. The cell migration and invasion abilities were evaluated by migration assay and invasion assay respectively. An increased expression of ROBO1 was revealed in cell BxPC-3-LN compared with cell BxPC-3. Elevated expression of miRNA-218 would suppress the expression of ROBO1 via complementary binding to a specific region within 3′UTR of ROBO1 mRNA (sites 971–978) in pancreatic cancer cells. Stably restoring the expression of miRNA-218 in pancreatic cancer significantly downregulated the expression of ROBO1 and effectively inhibited cell migration and invasion. Forced expression of mutant ROBO1 could reverse the repression effects of miRNA-218 on cell migration and invasion. Consequently, miRNA-218 acted as a tumor suppressor in pancreatic cancer by inhibiting cell invasion and migration. ROBO1 was a functional target of miRNA-218’s downstream pathway involving in cell invasion and migration of pancreatic cancer.     

RNAi干扰食管癌EC9706细胞MTA1基因表达对侵袭和迁移的影响

Objective  To observe the effect of MTA1 gene silencing by RNA interference on invasion and migration of esophageal carcinoma 9706 cells. Methods  siRNA expression vector targeting MTA1 gene was transfected into EC9706 cells by Lipofectamine method. MTA1 mRNA and protein expressions were detected through quantitative RT-PCR and Western Blot, respectively. The invasion and migration of EC9706 cells were evaluated by scrape wound healing assay and cell invasion assay in vitro. Results  MTA1 gene expression decreased significantly. The scrape wound of EC9706 cells healed more slowly and the cell population that cut through Matrigel were less in the EC9706 cells transfected with siRNA expression vector than non-transfected EC9706 cells and EC9706 cells transfected with blank vector (P < 0.05). Conclusion  MTA1 gene silencing by RNAi can inhibit the invasion and migration of esophageal carcinoma effectively. It is supposed that MTA1 gene may be a prospective molecule target in tumor therapy. Supported by a grant from the “Tenth Five-Year Plan” Research Foundation for the Key Construction Project (211 Projects) by Ministry of Education of China (2002).     

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。     

靶向Survivin的siRNA对胰腺癌细胞PC-2的放射增敏作用

目的采用RNA干扰技术阻断Survivin基因的表达,观察其诱导胰腺癌细胞凋亡及对放射的增敏作用。方法构建靶向Survivin的siRNA真核表达载体,采用lipofectamineTM2000转染胰腺癌细胞PC-2,采用半定量RT-PCR、免疫组化技术检测转染前后PC-2细胞Survivin基因表达的变化;采用流式细胞术检测其诱导PC-2细胞凋亡及对放射的增敏作用。结果靶向Survivin的序列特异性的siRNA可以有效地抑制PC-2细胞Survivin基因的表达,在mRNA水平其表达抑制率为81.25%;在蛋白质水平其表达抑制率为74.24%;转染靶向Survivin的siRNA真核表达载体48h后可以诱导7.03%的细胞凋亡;阻断Survivin基因的表达,可以显著提高PC-2细胞对放射的敏感性,靶向Survivin的siRNA联合放射可以诱导14.58%的细胞凋亡。结论本研究所构建的靶向Survivin的siRNA真核表达载体可以有效、特异地阻断Survivin基因的表达,阻断Survivin基因的表达可以诱导一定程度的PC-2细胞的自发凋亡,并显著增强其对放射的敏感性。靶向Survivin的RNA干扰技术在胰腺癌的基因治疗中具有重要的潜在价值。