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1.
Gliomas are the most aggressive of all human malignancies. Survivin is overexpressed in gliomas, and overexpression of survivin is associated with the progression of gliomas and the poor prognosis of glioma patients. Arsenic trioxide (ATO) is used in patients with acute promyelocytic leukemia and is active in vitro in several solid tumor cell lines. In the present study, the human glioma cell line U118-MG was used to investigate the anti-cancer effect of ATO in vitro and in vivo. The molecular mechanisms of the relationship between cell death (autophagy and apoptosis) and survivin were analyzed. ATO reduced cell viability through an increase in mitotic cells in a concentration-dependent manner. The mechanisms of ATO-induced autophagy and apoptosis were mediated by the inhibition of PI3K/Akt and the activation of MAPK signaling pathways. The ATO treatment of U118-MG cells pre-treated with specific chemical inhibitors of PI3K/AKT and MAPK significantly changed the cytotoxicity and the expression of survivin, suggesting that survivin plays a pivotal role in ATO-induced cell death. When U118-MG cells were transfected with survivin shRNA, the results demonstrated a significant increase in apoptotic and autophagic cells. In in vivo studies, the ATO treatment of SCID mice showed a significant tumor growth delay time and the decreased expression of survivin in tumor tissue. An important result from the current study is the finding that survivin could suppress both autophagy and apoptosis in glioma cells. This study suggests that ATO treatment or survivin inhibition could be a novel therapeutic strategy in malignant gliomas.  相似文献   

2.
目的探讨Survivin作为基因表达调控因子,对核因子κB(NF-κB)基因的转录及蛋白水平活性的影响及与NF-κB的调控关系。方法采用Survivin短发夹RNA(shRNA)干扰技术,脂质体转染食管癌ECA109细胞,检测Survivin沉默效果,选择最佳转染浓度;半定量RT-PCR检测Survivin shRNA干扰后食管癌ECA109细胞中NF-κB及其通路的上游调控因子核因子κB抑制蛋白α(IKKα)、IKKβ表达变化;Western blotting方法检测NF-κB蛋白的表达变化;流式细胞术检测干扰之后食管癌ECA109细胞增殖、凋亡指数的变化。结果 Survivin shRNA干扰食管癌ECA109细胞后,Survivin mRNA和蛋白表达明显下调;NF-κB mRNA表达变化无明显差异,但其蛋白磷酸化水平降低,NF-κB上游因子IKKα、IKKβmRNA表达下调;食管癌ECA109细胞凋亡明显增加,G2期细胞比例增加,S期细胞减少,细胞周期受阻。结论 Survivin通过在转录水平影响IKKα、IKKβmRNA表达,调控NF-κB蛋白活化水平,提示Survivin在肿瘤信号调控网络中可作为一个新的基因表达调控因子。  相似文献   

3.
Neuroblastoma is a solid tumor that occurs mainly in children. Malignant neuroblastomas have a poor prognosis because conventional chemotherapeutic agents are not very effective. Survivin, a member of the inhibitor of the apoptosis protein family, plays a significant role in cell division, inhibition of apoptosis, and promotion of cell proliferation and invasion. Previous studies found that survivin is highly expressed in some malignant neuroblastomas and is correlated with poor prognosis. The aim of this study was to investigate whether survivin could serve as a potential therapeutic target of human neuroblastoma. We employed RNA interference to reduce survivin expression in the human neuroblastoma SH-SY5Y cell line and analyzed the effect of RNA interference on cell proliferation and invasion in vitro and in vivo. RNA interference of survivin led to a significant decrease in invasiveness and proliferation and increased apoptosis in SH-SY5Y cells in vitro. RNA interference of survivin inhibited tumor growth in vivo by 68±13% (P=0.002) and increased the number of apoptotic cells by 9.8±1.2% (P=0.001) compared with negative small interfering RNA (siRNA) treatment controls. Moreover, RNA interference of survivin inhibited the formation of lung metastases by 92% (P=0.002) and reduced microvascular density by 60% (P=0.0003). Survivin siRNA resulted in significant downregulation of survivin mRNA and protein expression both in vitro and in vivo compared with negative siRNA treatment controls. RNA interference of survivin was found to be a potent inhibitor of SH-SY5Y tumor growth and metastasis formation. These results support further clinical development of RNA interference of survivin as a treatment of neuroblastoma and other cancer types.  相似文献   

4.
Survivin has recently been identified as a novel inhibitor of apoptosis (IAP). Unlike other members of the IAP family, survivin is characterized by a unique structure that contains a single baculovirus IAP repeat and no really interesting new gene (RING) finger motifs, and it is expressed in many common human cancers, but not in normal tissues. Survivin regulates the G(2)/M phase of the cell cycle by associating with mitotic spindle microtubules, and it directly inhibits caspase-3 and caspase-7 activity. During tumorigenesis, survivin expression is inversely correlated with apoptosis inhibition and positively correlated with proliferation and angiogenesis. Inhibition of apoptosis by survivin predicts poor prognosis and shorter survival in human cancers. The molecular detection of occult cancer by the targeting of survivin as a novel molecular marker is useful, and micrometastasis detected by immunohistochemical staining for survivin reveals inhibition of apoptosis and the acceleration of cell proliferation. In in-vitro and in-vivo studies, survivin targeting with antisense and survivin mutants induces apoptosis, reduces tumor growth potential, and sensitizes cells to chemotherapeutic drugs and X-irradiation. These results suggest that survivin may have the potential to function as a new target for the diagnosis and treatment of cancer.  相似文献   

5.
目的 研究转染生存素(survivin)反义寡核苷酸(Asodn)抗肿瘤作用以及是否增强紫杉醇敏感性.方法 实验分为:空白对照组(Control组)、脂质体组(Lip组)、正义寡核苷酸组(Sodn组)及反义寡核苷酸组(Asodn组).人工合成Asodn,经脂质体转染SGC7901细胞,MTT检测细胞增值抑制率,Western blot检测survivin蛋白表达,Hoechst33258染色荧光显微镜下观察细胞凋亡形态学改变及流式细胞仪检测细胞凋亡率.结果 ① 荧光显微镜下Control组、Lip组及Sodn组细胞核呈均匀蓝色、圆形或椭圆形,而Asodn组细胞核染色增强,核质浓缩,核碎裂;② Asodn 组细胞增殖抑制率增高,并呈时间-剂量依赖性;survivin 蛋白表达减低;凋亡率增高.与Control组、Lip组及Sodn组相比,差异均有统计学意义(P<0.05);③ Asodn联合紫杉醇组其抑制率 (78.1±0.8)%明显高于单纯 Asodn组(54.9±1.6)%和紫杉醇组 (56.7±0.7)% (P<0.05).结论 转染Asodn 能明显抑制SGC7901细胞增殖、诱导凋亡并增强紫杉醇抗肿瘤作用.  相似文献   

6.
反义survivin联合顺铂抑制裸鼠荷骨肉瘤生长   总被引:3,自引:3,他引:0       下载免费PDF全文
目的:探讨反义基因治疗与化疗联合应用提高骨肉瘤疗效的可行性及其机制。 方法:通过构建荷骨肉瘤裸鼠模型,采用瘤内注射和腹腔给药方式,以 survivin反义寡核苷酸(ASODN)配合顺铂(DDP)对瘤鼠进行联合干预治疗,并与各单药组进行比较,观测各组裸鼠肿瘤生长情况、评估瘤体病理形态,免疫组织化学法检测瘤组织survivin蛋白表达,DNA末端原位标记法(TUNEL法)检测肿瘤细胞凋亡水平。 结果:与各单药组相比,联合治疗组在显著下调survivin蛋白表达同时,肿瘤细胞凋亡坏死更为明显,肿瘤生长受抑效果更强。 结论:ASODN对DDP具有明显增效作用,可弥补DDP耐药缺陷,二者联合可望发挥协同抗瘤效应。  相似文献   

7.
Objective: To construct survivin shRNA expression vector carting enhanced green fluorescent protein gene, transfect it into GBC-SDH cells via electroporation, and get GBC-SD cells which are stable expressing survivin shRNA. Methods: The siRNA sequence targeting survivin mRNA was synthesized and cloned into pEGFP-H1. The constructed plasmid and pEGFP-H1 were transfected into GBC-SD cells respectively via liposome, and the transfecting effect was detected with Flow Cytometry. Then the transfected cells were selected with G418. Results: The recombinant plasmid was successfully constructed, named pEGFP-survivin. The gene transfection efficiencies in pEGFP-H1-transfected group and pEGFP-survivin- transfected group were the 80.29%±2.71% and 83.85%±2.34%(P>0.05), which was successful to get the cells that are stable expressing shRNA, named GBC-SD/EGFP and GBC-SD/survivin. Conclusion: Survivin shRNA expression vector was constructed successfully and got GBC-SD cells which are stable expression shRNA.  相似文献   

8.
9.
Survivin is a new member of the inhibitor of apoptosis family of anti-apoptotic proteins. It has been reported that survivin is expressed during fetal development and in cancer tissues. Because suppression of apoptosis is important for carcinogenesis and tumor growth, we investigated the expression of survivin in human endometrial carcinomas. We analyzed serial frozen sections for survivin protein expression in 26 patients with ovarian epithelial carcinoma and 10 patients with benign cystadenoma of the ovary by fluorescent immunohistochemistry. We analyzed the relationship between the percentages of survivin-stained cells and the characteristics of the patient including histological classification, clinical stage, histological grade, and clinical outcome. Survivin was weakly detected in some benign ovarian cystadenomas (0-12.1%). There was, however, abundant survivin immunoreactivity in the nucleus and/or cytoplasm of the epithelial ovarian carcinoma cells. Scoring on the basis of the percentage of positive cells indicated that survivin expression was significantly associated with PCNA-labeling index, clinical stage, histological grade, clinical outcome, and survival rate (p<0.01, respectively). We conclude that the survivin protein is a defining diagnostic marker for epithelial ovarian carcinomas that may also yield prognostic information.  相似文献   

10.
Objective: To investigate the inhibitory effect of plasmid-based survivin-specific short hairpin RNA and GRIM-19 on the growth of Hep-2 laryngeal cancer cells. Methods: The plasmid expressing survivin-specific short hairpin RNA (shRNA) and GRIM-19 (p-siRNA survivin/GRIM-19) was prepared and transfected into Hep-2 cells with Lipofectamine 2000. The mRNA and protein expression of surviving and GRIM-19 were measured with RT-PCR and western blot assay, respectively. MTT assay was employed to detect the proliferation of Hep-2 cells, and flow cytometry and AO/EB assay were done to determine the apoptosis of Hep-2 cells. Results: In the p-siRNA survivin/GRIM-19, the mRNA and protein expression of survivin was markedly reduced by 54.4% and 42.2%, and the reduction in protein expression of surviving was more obvious than that in the p-siRNA survivin group (37%) (P<0.05). The protein expression of GRIM-19 was markedly enhanced when compared with the control group (P<0.01). MTT assay revealed the proliferation of Hep-2 cells undergoing transfection with p-siRNA survivin/GRIM-19 was markedly inhibited, and the inhibition rate was as high as 79%, which was higher than that in the psi-survivin group (45%) and p-GRIM-19 group (35%). AO/EB assay and flow cytometry indicated that the apoptotic cells in the p-siRNA survivin/GRIM-19 group were dramatically increased as compared to the psi-survivin group and p-GRIM-19 group. Conclusion: The p-siRNA survivin/GRIM-19 has marked decrease in survivin expression and dramatic increase in GRIM-19 expression. Moreover, silencing of survivin and over-expression of GRIM-19 can significantly inhibit the growth and induce the apoptosis of Hep-2 in vitro and in vivo.  相似文献   

11.
Survivin, a member of the inhibitor of apoptosis protein gene family, inhibits apoptosis and promotes mitosis. We determined whether nuclear or cytoplasmic localization of survivin could predict survival of patients with upper urinary tract urothelial carcinoma (UUTUC). Immunohistochemical staining for survivin was carried out on archival specimens from 125 consecutive patients with UUTUC who underwent radical nephroureterectomy. Nuclear and cytoplasmic staining of survivin was scored and compared with clinicopathologic features and cancer-specific survival (CSS). Nuclear expression of survivin was significantly correlated with tumor grade (p?<?0.001), lymphovascular invasion (p?=?0.022) and poor survival with an estimated 5-year CSS probability of 54 % for tumors with nuclear expression of survivin vs. 73 % for those without nuclear expression of survivin (hazard ratio?=?2.19; 95 % confidence interval?=?1.02–4.70; p?=?0.043). The 5-year cancer-specific survival rates of patients with cytoplasmic survivin-negative and -positive tumors were 66 and 67 %, respectively. There was no difference in survival between patients with cytoplasmic survivin-negative tumors and those with cytoplasmic survivin-positive tumors. Using univariate analysis, nuclear survivin expression, tumor grade, pathological T stage, pathological N stage, and lymphovascular invasion were the predictive variables for CSS. In contrast, cytoplasmic survivin expression had no prognostic relevance. These data suggest that nuclear accumulation of survivin represents biologic aggressiveness and that nuclear survivin is a negative prognostic marker in patients with resected UUTUC.  相似文献   

12.
To detect the expression of anti-apoptotic factor Bcl-2 and Survivin in transferred HepG2 cells and evaluate the synergistic effect of IFN-γ gene on LIGHT-induced apoptosis signal transduction pathways, the full-length ORF of LIGHT and IFN-γ gene were cloned into pcDNA4 and verified by DNA sequencing. After being optimized by EGFP, recombinant LIGHT and IFN-γ were transferred into the HepG2 cells mediated by a cationic liposome in vitro. The expression of LIGHT and IFN-γ was identified in the supernatants by ELISA. The HepG2 cells were divided into three groups: the control, LIGHT gene transfection alone, and simultaneous transfection of LIGHT and IFN-γ genes. The cell apoptosis and expression of Bcl-2 and Survivin in cell lysate were detected through FCM. After transfection, the apoptosis rate of HepG2 cells was increased with the prolonged time, and the apoptosis rate of LIGHT group was higher than the control group, while the LIGHT/IFN-γ group was higher than the LIGHT group P < 0.01). The expression of Bcl-2 and Survivin in LIGHT group and LIGHT/IFN-γ group decreased dramatically compared with the control group. LIGHT gene alone can result in significant inhibition of HepG2 cells proliferation. INF-γ can synergistically precede LIGHT-induced apoptotic processes through down-regulation of Bcl-2 expression, but not survivin expression.  相似文献   

13.
Overexpression of survivin, an inhibitor of apoptosis protein, has been found in a variety of human cancers, and is associated with tumor aggressiveness. In this study, we analyzed the expression of survivin in papillary thyroid carcinoma (PTC) and evaluated its clinical significance for predicting an aggressive course of disease at the time of diagnosis. Survivin expression was determined by immunohistochemistry in 104 tissue specimens of PTC, confirmed by Western blot and correlated with clinicopathological parameters. Of the tumors examined, 74 (71.15%) showed high cytoplasmic survivin expression. There was no association between high survivin expression and age, gender or tumor size. On the other hand, it was closely correlated with the presence of lymph node metastasis (P = 0.009), and there was a tendency for correlation with extrathyroidal invasion (P = 0.062). The high risk PTC group (TNM stage III–IV) was associated with high levels of survivin (P = 0.027). These results indicate that survivin is an unfavorable molecule for PTC prognosis, and that its high expression may indicate a subset of PTC patients with a more aggressive disease course. Evaluation of its expression in fine needle aspiration samples could be a useful tool for the identification of those PTC patients who require more extensive surgery, careful follow-up and therapeutic strategy.  相似文献   

14.
目的探讨双向沉默Survivin和h TERT基因对结肠癌SW480细胞增殖和凋亡的影响,为结肠癌的基因治疗提供实验依据。方法设计并构建能够稳定转录shRNA并可分别及联合干扰Survivin和h TERT分子表达的质粒,将其转染结肠癌SW480细胞后,分阴性对照组、空白质粒对照组、Survivin RNAi组、h TERT RNAi组和Survivinh TERT RNAi组。转染48h后TRAP-PCR-ELISA法检测端粒酶活性,RT-PCR法检测Survivin和h TERT mRNA的表达,Western blot检测Survivin和h TERT蛋白的表达,流式细胞仪及cck-8法分别检测细胞凋亡和细胞增殖的变化。结果 Survivin-h TERT RNAi组SW480细胞端粒酶活性明显下降(P0.01),Survivin-h TERT RNAi组Survivin及h TERT的mRNA水平较正常对照组分别减低82.8%和73.6%(P0.01),蛋白表达抑制率分别为79.2%和66.7%(P0.01)。实验各组中Survivin-h TERT RNAi组细胞增殖抑制率和凋亡率最高,分别为43.6%±0.1%和39.2%±2.3%(P0.01)。结论 Survivin和h TERT双干扰质粒可明显下调Survivin和h TERT蛋白的表达,抑制结肠癌SW480细胞的增殖,促进其凋亡。  相似文献   

15.
目的研究 survivin 在激素非依赖性高转移潜能前列腺癌中的表达及其与前列腺癌的生物学行为及侵袭和转移潜能的相关性。方法应用 RNA 干扰技术构建 survivin 真核表达载体,转染人激素非依赖性前列腺癌高转移亚系 PC-3M-1E8细胞系。通过细胞生长曲线、肿瘤细胞裸鼠异种接种、软琼脂集落形成实验检测体内、体外细胞生长能力;流式细胞术检测 survivin RNA 干扰质粒对细胞周期及细胞凋亡的影响,Western blot 检测 caspase3活性片段,观察 survivin 抑制细胞凋亡的情况;Matrigel 穿膜实验检测肿瘤细胞体外侵袭能力。结果稳定转染 survivin RNA 干扰质粒的 PC-3M-1E8细胞中 survivin 的 mRNA 及蛋白水平明显降低,蛋白水平与阴性对照组相比,约下降78%~80%,差异有统计学意义(P<0.01);体外培养细胞生长速度及裸鼠体内肿瘤生长速度均明显减慢,锚着不依赖性生长的能力(软琼脂克隆形成数:14.33±3.51)与阴性对照组(52.33±6.81)及空白对照组(54.00±6.00)相比明显降低(P<0.01);凋亡细胞比例明显增加,空白对照组、阴性对照组及干扰阳性组的凋亡比例分别为5.88±0.99、6.97±1.60、16.40±1.95,干扰阳性组的凋亡比例显著高于对照组(P<0.01),并伴有 caspase3活性片段的表达增加;细胞阻滞在 G_0/G_1期(干扰阳性组、阴性对照组及空白对照组的细胞 G_0/G_1期的比例分别为52.71±1.10、43.59±1.83及43.65±3.44,P<0.05),并在细胞形态学上出现多核巨细胞现象;细胞体外侵袭能力明显降低,干扰阳性组的细胞(38.67±6.59)与阴性对照组(46.07±9.97)及空白对照组(47.87±9.58)相比穿膜细胞数明显减少(P<0.05)。结论 survivin 在激素非依赖性高转移潜能前列腺癌中高表达,并与细胞凋亡、细胞生长及肿瘤侵袭有关。抑制 survivin 的表达可能成为临床治疗激素非依赖性前列腺癌的方法之一。  相似文献   

16.
Inhibitors of apoptosis, including bcl-2 and survivin (a novel gene encoding a unique apoptosis inhibitor), regulate cell proliferation by promoting cell survival. Although survivin has been detected in several human cancers, its prognostic significance and relationship to bcl-2 are not well characterized in lung cancer. Tissue sections from 102 non-small cell lung carcinomas (NSCLC) were immunostained using antibodies against survivin and bcl-2. Staining results were correlated with prognostic variables. Immunoreactivity for survivin and bcl-2 was observed in 53% and 21% of NSCLCs, respectively. Fifty-two percent of the 50 squamous cell carcinomas and 54% of the 52 adenocarcinomas expressed survivin. Survivin positivity correlated with tumor stage in squamous cell carcinoma. On univariate analysis, survivin expression correlated with decreased patient survival in NSCLC and in the subset of squamous cell carcinomas, but not in adenocarcinomas. On multivariate analysis, survivin was an independent predictor, along with distant metastasis and large tumor size. Eighteen percent of squamous cell carcinomas and 24% of adenocarcinomas expressed bcl-2. On univariate analysis, bcl-2 expression correlated with increased patient survival in NSCLC and in the subset of squamous cell carcinomas. An inverse correlation between the expression of survivin and bcl-2 was noted. Survivin immunoreactivity is an independent predictor of shortened survival in NSCLC, while bcl-2 protein expression correlated with prolonged patient survival. These findings indicate an inverse relationship between survivin and bcl-2 expression and suggest that these two inhibitors of apoptosis function through different pathways in the regulation of tumorigenesis in NSCLC.  相似文献   

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18.
RNAi下调survivin表达诱导成人神经细胞瘤细胞凋亡   总被引:5,自引:3,他引:2  
目的利用RNA干扰技术下调凋亡抑制因子survivin在人成神经细胞瘤细胞系SH-SY5Y中的表达,并评价其对肿瘤细胞凋亡的影响。方法将设计合成的寡核苷酸片段退火后连入pBSHH1构建survivin的短发夹RNA表达质粒pBSHH1-survivin;通过RT-PCR和Western印迹评价其对SH-SY5Y细胞内源性survivin表达的抑制作用;运用Hoechst33258核染色、DNA凝胶电泳以及AnnexinFITC染色检测survivin表达下调对SH-SY5Y细胞凋亡的影响。结果酶切和DNA测序证实survivin的短发夹RNA表达质粒构建成功;RT-PCR和Western印迹表明质粒转染SH-SY5Y细胞后能明显下调survivin的表达;Hoechst33258核染色、DNA凝胶电泳以及AnnexinⅤFITC染色显示下调survivin的表达能诱导SH-SY5Y细胞凋亡。结论成功构建了有效针对survivin的短发夹RNA表达质粒;下调survivin的表达能诱导SH-SY5Y细胞凋亡。  相似文献   

19.
目的 研究藤梨根乙酸乙酯提取物对食管癌细胞系EC109细胞裸鼠移植瘤的生长抑制作用和凋亡诱导作用,并探讨其作用机制. 方法 建立食管癌EC109细胞裸鼠移植瘤模型,观察藤梨根乙酸乙酯提取物的作用.将裸鼠分为对照组、治疗组(低剂量组、高剂量组),每组6只.通过测量移植瘤体积变化绘制生长曲线,根据终末瘤重比较计算抑制率;采用TUNEL法检测移植瘤凋亡指数,采用免疫组织化学法检测移植瘤生存素(Survivin)蛋白表达和增殖指数;用RT-PCR法检测移植瘤Survivin mRNA变化. 结果 各治疗组经藤梨根乙酸乙酯提取物治疗后移植瘤生长缓慢,治疗结束时治疗组移植瘤重及瘤体积明显低于对照组,高、低剂量组的瘤重抑制率分别为64.57%和46.78%.各治疗组移植瘤组织凋亡指数则明显高于对照组,而Ki-67抗原、Survivin mRNA及蛋白表达较对照组明显减少,高剂量组尤其明显,各组间上述指标比较差异均有统计学意义(P<0.01). 结论 藤梨根乙酸乙酯提取物对食管癌EC109细胞裸鼠移植瘤生长有抑制作用,其机制与抑制移植瘤细胞的增殖活性,降低其Survivin蛋白和mRNA表达及促进癌细胞凋亡有关.  相似文献   

20.
Survivin is an inhibitor of apoptosis protein, which is overexpressed in many carcinomas, including lung carcinoma. The aim of this immunohistochemical study was to investigate the role of survivin in the early steps of lung carcinogenesis and non-small cell lung carcinomas (NSCLC), and its relationship with expression of p53 protein, a tumor suppressor gene involved in cell cycle control. In the normal bronchial epithelium, low-grade atypical adenomatous hyperplasia (AAH) and non-neoplastic lung parenchyma adjacent to tumor, survivin was found completely negative. Expression of survivin was detected in the areas of squamous metaplasia and dysplasia as well as high-grade AAH lesions adjacent to tumor. Survivin was expressed in 50 (64%) and p53 in 41 (53%) NSCLC. Survivin expression was significantly correlated with lymph node metastasis (p=0.02). There was no correlation between survivin and p53 expression. The patients with expression of survivin had significantly worse prognosis (Log-rank test, p=0.003). Multivariate Cox regression analysis showed TNM stage (p<0.001) and survivin expression (p=0.003) as independent prognostic indicators. In conclusion, survivin expression might be an early step in lung carcinogenesis. Survivin expression might also be used as a prognostic indicator predicting the worse outcome in NSCLC, and might be a novel target for the treatment of patients with preinvasive lesions of lung and NSCLC.  相似文献   

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