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1.
Objective To investigate the effects of small interfering RNA (siRNA) recombinant expression vector targeting survivin gene on chemotherapy sensitivity of human colon cancer cells to 5-fluorouracil. Methods siRNA recombinant expression vector targeting survivin gene was constructed and transfected into human colon cancer cell lines LOVO. After 48 hours of transfection, cells were harvested for analysis of survivin mRNA and protein expressions using RT-PCR and Western blot. In addition, after human colon cancer cell lines were treated with Survivin siRNA and/or 5-fluorouracil, MTT assay and flow cytometry were used to analyze cell proliferation and apoptosis. Results Restriction endonuclease analysis confirmed that siRNA recombinant expression vector targeting survivin gene was successfully constructed. Inhibitory ratios of survivin mRNA and protein expressions by Survivin siRNA were 36.33% and 44.65%, respectively. Survivin siRNA combined with 5-fluorouracil significantly increased the cell proliferation inhibitory ratio and apoptosis ratio compared with 5-fluorouracil treatin~ alone (P〈0.05). Conclusion The siRNA recombinant expression vector targeting survivin gene can inhibit the expression of survivin gene, and enhance chemotherapy sensitivity of human colon cancer cells to 5- fluorouracil.  相似文献   

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Background Survivin, a member of the inhibitor of apoptosis protein (IAP) family, overexpresses in tumor cells and not expresses in terminally differentiated adult tissues. This study aimed to investigate the effects of survivin-specific siRNA on cell proliferation, apoptosis and chemosensitivity to cisplatin in vitro and in vivo and explore the mechanisms about decreasing expression of survivin in reversing cancer cells resistance to chemotherapeutic drug.Methods Survivin-specific siRNA was transfected into A549/DDP cells. The expression of survivin and lung resistance-related protein (LRP) mRNA levels were determined by RT-PCR, chemosensitivity of A549/DDP (cisplatin)cells to cisplatin was determined by MTT assay, and apoptosis and cell cycle were determined by flow cytometry (FCM).The protein expression levels of survivin, LRP, cyclin-D1, caspase-3 and bcl-2 were determined by Western blotting analyses. The effect of survivin siRNA inhibition on tumor growth was studied in athymic nude mice in vivo.Results Survivin-specific siRNA efficiently down-regulated survivin expression. The cell cycle was arrested at G2/M phase, and apoptosis was obviously found. Inhibition of survivin expression could make the IC50 and drug-resistant index of cisplatin decrease, and enhance the cancer cells sensitivity to cisplatin. After transfection by survivin-specific siRNA, expression of LRP and cyclin-D1 were downregulated, caspase-3 expression was upregulated, bcl-2 expression had no obvious change. The animal experiment confirmed knockdown of survivin could inhibit the tumor growth.Conclusions Survivin-specific siRNA can efficiently suppress the expression of survivin, increase apoptosis, inhibit cells proliferation and enhance the chemosensitivity to cisplatin in vitro and in vivo. Suppression of survivin expression helping to reverse drug-resistance may have relationship with downregulation of LRP and upregulation of caspase-3.Anti-tumor strategies based on the inhibition of survivin may be useful in targeting lung adenocarcinomas.  相似文献   

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Purpose:The metallopanstimulin-1(MPS-1)gene is a growth factor-inducible gene,which is highly expressed in many human cancers and may be involved in the progression towards tumor malignancy.However,it is unclear whether MPS-1 plays any role in gastric cancer development or progression.Our studies were designed to clarify the MPS-1 expression pattern and to explore its potential role in gastric cancer.Experimental Design:The expression pattern of MPS-1 was determined in primary gastric cancer specimens and gastric cancer cell lines via immunohistochemistry and Western blotting.To investigate the functional significance of MPS-1 expression,three small interfering RNA(siRNA)expression plasmids were constructed and transfected into gastric cancer cell line SGC7901.The stable cell lines transfected with the siRNA targeting MPS-1 mRNA plasmids were selected and the biological features of these cells were examined.Results:MPS-1 was overexpressed in 86% of the gastric cancer tissues and all gastric cancer cells.In addition,MPS-1 expression was significantly increased and corresponded with the tumor-node-metastasis clinical stage,and was significantly higher in the late stage(P<0.01).The MPS-1 expression level was significantly decreased in the transfected cells with MPS-1-specific siRNA expression plasmid pRNAT-133.Furthermore,the stable transfected cancer cells exhibited an increase in the incidence of spontaneous apoptosis and a decrease in growth ability and tumorigenicity in nude mice.Conclusions:These results provide strong evidence that MPS-1 plays an important role in gastric cancer cell proliferation and development,and suggests that MPS-1 is a promising target for gastric cancer treatment.  相似文献   

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The effects of insulin or insulin in combination with chemotherapeutic drugs on the proliferation and apoptosis of endometrial carcinoma cells were examined with an aim to determine the efficacy and safety of insulin in endometrial cancer therapy.Ishikawa and Hec-1A cells were treated with insulin and/or paclitaxel.Cell proliferation was assessed by MTT assay.Cell cycle and cell apoptosis were determined by flow cytometry (FCM).Survivin gene expression was detected by RT-PCR.Our results showed that in a certain range of working concentrations and action time, insulin could mildly augment cell proliferation and the percentage of S phase cells in endometrial cancer (Ishikawa/Hec-1A) cells.Insulin plus paclitaxel (combination group) could significantly inhibit cell proliferation (69.38%±2.32% vs 40.31%±4.52% with Ishikawa; 64.11%±6.33% vs 45.89%±3.27% with Hec-1A) and increase cell apoptosis compared with treatment with paclitaxel alone (paclitaxel group).Survivin gene expression was also significantly decreased in combination group as compared with paclitaxel group.We are led to conclude that insulin can mildly augment cell proliferation and present chemotherapy sensitivity in endometrial cancer cells.Insulin can be to used safely and efficiently in endometrial cancer therapy.  相似文献   

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Background Bladder cancer is the most common type of urinary system tumours. It is frequently associated with genetic mutations that deregulate the cell cycle and render these tumours resistant to apoptosis. Survivin, a newly discovered member inhibitor of apoptosis protein (IAP) family in several human cancers, by inducing cell proliferation and inhibiting apoptosis is frequently activated in bladder cancer. We studied the influence of small interfering RNA (siRNA) targeting survivin on the biological behaviour of bladder cancer cells. Methods A double strand survivin target sequence specific siRNA was designed and synthesized. After transfection of bladder cancer cell line T24 by siRNA/liposome complex with increasing concentrations (50-200 nmol/L), the transfectant cells were intratumourally injected at different doses (5 μg or 50 μg). The effects were measured in vitro and in vivo. Results The selected siRNA efficiently down-regulated survivin mRNA expression in a dose and time dependent manner. The maximal effect was achieved at the concentration of 100 nmol/L, at which survivin expression level was down-regulated by 75.91%. The inhibition rate of cell growth was 55.29% (P〈0.01) and the markedly increased apoptotic rate was 45.70% (P〈0.01). In vivo intratumoural injection of 50 μg siRNA-survivin could notably orevent the growth of bladder cancer (P〈0.01) in xenografted animals. Conclusion The application of siRNA-survivin could markedly inhibit survivin expression in bladder cancer cell line by inducing apoptosis and inhibiting the growth of the tumour. It may become a new gene therapy tool for bladder cancer.  相似文献   

8.
In order to investigate the effect of Polo-like kinase-1 (Plk1) depletion on cell cycle progression and cell growth in lung cancer cells, a recombinant plasmid containing antisense RNA targeting Plk1 (pcDNA3-Plk1) was transfected into A549 cells by lipofectine. RT-PCR and Western-blot were used to detect the Plk1 gene expression. Cell proliferation was evaluated by direct cell counting and bromodeoxyuridine (BrdU) labeling. Cell cycle distribution and apoptosis were examined by flow cytometry, and the inhibition rate (IR) by vinorebline (NVB) was determined by MTF assay. The results showed that after transfection of pcDNA3-Plk1 into A549 cells, the expression levels of Plk1 mRNA and protein were greatly decreased. In pcDNA3-Plk1 transfected groups, abnormal morphological changes of cells and growth inhibition were observed, and the BrdU labeling index was significantly lower than in the control groups (P〈0.05). Cells in pcDNA3-Plk1 transfected groups were arresed in G2/M phase and apoptosis was detectable 72 h post transfection. IR induced by vinorebline in pcDNA3-Plk1 transfected groups was significantly higher than in other groups. These data suggested that antisense RNA targeting Plk1 could suppress the Plk1 expression, and therefore, significantly inhibit cell proliferation and induce cell cycle arrest and apoptosis. Moreover, it sensitized lung cancer cells to chemotherapy.  相似文献   

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The expression of N-myc down-regulated gene 1 (NDRG1) has previously been reported to be involved in the proliferation,differentiation,invasion and metastasis of cancer cells,but its role in cervical cancer is still unclear.This study aimed to investigate the expression of NDRG1gene in human cervical cancer and its effect on aggressive tumor behaviors.The NDRG1 expression in cervical tissues and cells was detected by RT-PCR.Specific expression plasmid pEGFP-N1-NDRG1-GFP was used to enhance the expression of NDRG1 in human cervical cancer cell lines.The mRNA and protein level of NDRG1 was assessed by RT-PCR and Western blotting,respectively.Its effects on cell proliferation,migration,invasion,cell cycle and apoptosis were detected by MTT,transwell migration assay and flow cytometry (FCM),respectively.The results showed that the expression of NDRG1 in cervical cancer tissues and cells was significantly lower than in normal cervical tissues (P<0.001).After transfection with pEGFP-N1-NDRG1-GFP,the mRNA and protein expression of NDRG1 was up-regulated in Siha cells,which suppressed cell proliferation (P<0.001),induced cell cycle arrest (P<0.05),reduced invasion and migration of Siha cells (P<0.05),but caused no cell apoptosis.Moreover,vascular endothelial growth factor (VEGF),a tumor-induced angiogenesis factor,was markedly reduced and E-cadherin,a cell adhesion molecule,was increased in the cells transfected with pEGFP-N1-NDRG1-GFP.It was concluded that up-regulated NDRG1 may play a role in the suppression of malignant cell growth,invasion and metastasis of human cervical cancer.  相似文献   

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靶向survivin的siRNA诱导胰腺癌细胞凋亡的实验研究   总被引:7,自引:0,他引:7  
目的 采用RNA干扰技术(siRNA)阻断survivin基因的表达,观察其抑制胰腺癌细胞增殖及诱导胰腺癌细胞凋亡的作用。方法 构建靶向survivin的siRNA质粒表达载体,采用Lipofectamine^TM2000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MTT法检测对PC-2细胞增殖的抑制作用:采用流式细胞术检测其诱导PC-2细胞凋亡的作用。结果 靶向survivin的序列特异性的siRNA可以高效地抑制PC-2细胞survivin基因表达,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质粒表达载体可以显著抑制PC-2细胞的增殖,细胞接种24、48h后其增殖抑制率分别为28.00%和33.38%:转染后24、48h可以诱导8.46%、7.53%的细胞凋亡。结论 所构建的靶向survivin的siRNA质粒表达载体可以有效地阻断PC-2细胞survivin基因表达。阻断survivin基因表达可以显著地抑制PC-2细胞的增殖并在一定程度上诱导其凋亡,靶向survivin的siRNA在胰腺癌的基因治疗中具有一定的价值。  相似文献   

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目的:探讨survivin特异性siRNA对肝细胞癌HepG2细胞的生长抑制作用及减毒沙门菌携带survivin siRNA对裸鼠肝癌皮下移植瘤生长抑制作用及其相关机制。方法:针对survivin的siRNA表达载体,脂质体和空质粒2个对照组分别转染肝细胞癌HepG2细胞后,应用RT-PCR和Western blott...  相似文献   

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目的 应用RNA干扰技术抑制人Survivin基因表达,观察其对乳腺癌SKBr-3细胞增殖和凋亡的影响.方法 设计、合成靶向Survivin基因的siRNA基因片段,应用脂质体包埋转染乳腺癌SKBr-3细胞,采用MTT比色法检测细胞增殖率、RT-PCR和Western blot法观察乳腺癌细胞Survivin mRNA和蛋白质的表达、流式细胞仪检测细胞凋亡率.结果 MTt检测显示Survivin-siRNA组对细胞增殖有明显抑制作用(P<0.05),其细胞最高抑制率为(43.1±O.3)%;RT-PCR检测显示Survivin-siRNA组mRNA表达明显下调(P<0.01),其相对表达量分别为0.203 ±0.018、0.229±0.019,抑制率分别为55.2%、49.4%;Western blot检测显示Survivin-siRNA组蛋白表达下调(P<0.01),其蛋白相对表达量分别为0.702±0.007、0.684±0.016,抑制率分别为34.8%、36.4%;流式细胞仪检测显示Survivin-siRNA组细胞凋亡率明显增高(P<0.01),分别为(14.2±1.4)%、(16.8±0.6)%.结论 Survivin-siRNA能有效封闭Survivin的表达,抑制SKBr-3细胞增殖并诱导细胞凋亡,推测Sur-vivin基因可能成为乳腺癌基因治疗的一个新靶点.  相似文献   

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survivin 靶向siRNA 对膀胱癌细胞增殖和凋亡作用的体外研究   总被引:1,自引:0,他引:1  
曾柯  吴小候  杜虎 《重庆医学》2007,36(14):1360-1362
目的 观察靶向survivin的siRNA对膀胱癌细胞T-24增殖和凋亡的影响.方法 使用lipofectamineTM2000将靶向survivin的siRNA真核表达载体转染至膀胱癌细胞T-24,半定量RT-PCR检测T-24细胞survivin基因表达的变化;MTT法检测对T-24细胞增殖的影响;膜联蛋白V-PI(annexinV-PI)染色及流式细胞技术检测诱导凋亡的影响.结果 靶向survivin的序列特异性siRNA可以高效率抑制T-24细胞survivin基因在基因水平的表达,mRNA抑制率为61.73%;细胞重新接种24、48h后,其增殖抑制率分别为32.42%和37.48%;转染24h后可以诱导细胞凋亡16.76%.结论 利用RNA干扰技术沉默survivin基因表达可以显著抑制T-24细胞增殖,并在一定程度上诱导其自发凋亡,靶向survivin的RNA干扰技术在膀胱癌的基因治疗中具有一定价值.  相似文献   

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Survivin表达抑制影响鼻咽癌细胞的增殖与凋亡   总被引:1,自引:1,他引:1  
目的研究Survivin表达抑制对鼻咽癌细胞增殖和凋亡的影响,探讨Survivin在鼻咽癌中的生物学功能。方法采用脂质体将Survivin特异性SiRNA(small interfering RNA)转入鼻咽癌细胞株5-8F,培养48h后,收集细胞。逆转录-聚合酶链式反应(RT-PCR)、流式细胞仪(flow cytometry,FCM)分别检测Survivin mRNA和蛋白在细胞中表达。流式细胞仪检测细胞凋亡与周期,显微镜下计数检测细胞增殖抑制。结果SiRNA抑制5-8F细胞Survivin表达后,细胞凋亡指数显著高于对照组(P<0.01);S/G1比值显著高于对照组(P<0.01);细胞增殖抑制率也显著高于对照组(P<0.01);脂质体对照组与阴性SiRNA对照组比较,细胞凋亡、周期和增殖差异无显著性(P>0.05)。结论Survivin表达抑制,诱导鼻咽癌细胞凋亡并抑制其增殖。  相似文献   

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刘永全  江涛  冯燕梅 《重庆医学》2008,37(4):388-390,392
目的研究survivin基因与肺腺癌的关系,探讨survivin对肺腺癌A549细胞增殖和凋亡的影响。方法合成抑制survivin基因的siRNA,通过脂质体转染到肺腺癌A549细胞中,荧光倒置显微镜下观察细胞形态学变化,流式细胞仪检测各组细胞增殖和凋亡指数,Western blot检测survivin编码表达的蛋白,RT-PCR检测survivin mRNA的表达。结果抑制survivin在肺腺癌A549细胞中的表达后,能够抑制A549细胞增殖,诱导细胞的凋亡,survivin基因编码表达的蛋白明显减少。结论应用RNAi抑制survivin基因,可以抑制A549细胞增殖,促进细胞凋亡。survivin能作为治疗肺腺癌的一个潜在的基因靶点。  相似文献   

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目的 探讨靶向抑制膀胱癌细胞系T24中BIRC5基因的表达后,该基因编码产物Survivin蛋白对膀胱癌增殖的影响.方法 将设计合成的靶向BIRC5序列的小分子干扰RNA(small interfering RNA,siRNA),转染膀胱癌细胞系T24,应用RT-PCR技术和Western blot方法检测目的基因转录及表达水平.通过生长曲线来检测survivin基因沉默后细胞增殖的改变.结果 特异性siRNA转染后,survivin mRNA及蛋白水平均明显下降.与空白对照组相比较,转染组细胞增殖情况明显受到抑制,差异具有统计学意义(P<0.05).结论 特异靶向survivin的siRNA能有效抑制survivin的表达,显著抑制细胞的增殖,为膀胱癌的临床治疗提供新方向.  相似文献   

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