Survivin siRNA纳米载体的制备及其对胰腺癌细胞生物学特性的影响

目的：利用纳米技术和基因干扰技术设计并合成携载survivin siRNA的纳米载体,探讨survivins iRNA纳米微粒对人胰腺癌细胞BXPC-3增殖和凋亡的影响。方法：体外培养人胰腺癌BXPC-3细胞,将BXPC-3细胞随机分为4组：生理盐水组、不含基因的纳米微粒组、survivin siRNA组和s urvivins iRNA纳米微粒组。RT-PCR检测survivin mRNA的表达;Wes tern blot法检测s urvivin蛋白的表达;流式细胞仪检测细胞凋亡情况;MTT法检测细胞增殖情况。结果：细胞培养72 h后,survivin siRNA纳米微粒组细胞的survivin mRNA和蛋白表达均低于其他3组（P〈0.05）。survivin siRNA纳米微粒组细胞增殖明显受抑制,生长缓慢,而细胞凋亡率高于其他3组（P〈0.05）。结论：survivin siRNA纳米微粒能够有效减少胰腺癌BXPC-3细胞survivin mRNA和蛋白的表达,提高肿瘤细胞的凋亡,显著抑制BX-PC-3细胞的增殖。     

小分子干扰RNA抑制肺癌细胞Survivin表达对凋亡和顺铂耐药性的影响

目的 观察应用小分子干扰RNA(siRNA)技术抑制肺癌A549细胞中Survivin表达对细胞凋亡和顺铂耐药性的影响.方法 设计、合成特异性抑制Survivin表达的siRNA,转染肺癌A549细胞48 h后,检测Survivin基因mRNA表达量以及肺癌细胞凋亡率和对顺铂耐药性变化.结果 A549细胞转染Survivin特异siRNA后,Survivin/β-actin基因mRNA表达比例1.17±0.25下降至0.41±0.18,抑制率65.10%;细胞凋亡率由2.67%上升至32.33%;顺铂半数抑制浓度(ICSO)由6.37 ms/L降低至2.42 ms/L.结论 通过siRNA特异性抑制肺癌A549细胞中Survivin基因表达可增加凋亡,逆转顺铂耐药.     

RNAi载体抑制survivin基因在胰腺癌PANC-1细胞中的表达

目的:观察survivin特异性RNAi载体对胰腺癌PANC-1细胞中survivin mRNA和蛋白的表达的抑制作用。方法:将U6启动子驱动的survivin特异性RNAi质粒载体和阴性对照质粒分别转染PANC-1细胞,用RT-PCR和Western blot分别检测survivin mRNA和蛋白的表达。结果:转染survivin特异性RNAi载体24 h和48 h后,PANC-1细胞survivin mRNA表达抑制率分别为(52.67±3.51)%和(75.33±3.06)%,蛋白表达抑制率分别为(58.00±3.61)%和(76.67±4.73)%;与阴性对照组比较,差异均有统计学意义(均P<0.05)。结论:以U6为启动子的survivin的RNAi载体,能有效地抑制胰腺癌细胞株PANC-1中survivin的表达。     

siRNA沉默survivin基因对肺癌细胞凋亡的影响

目的观察siRNA（Small interference RNA,siRNA）介导survivin基因对肺癌细胞凋亡作用。方法设计、合成针对survivin的siRNA并构建相应载体,转染对数生长期肺癌细胞A549,对比阴性对照组和空白对照组;半定量RT-PCR检测survivin mRNA的表达,MTT法检测细胞生长,流式细胞仪检测肺癌细胞的凋亡。结果转染siRNA组survivin mRNA表达明显低于阴性对照组和空白对照组（P〈0.05）。MTT法检测各组细胞生长曲线阴性对照组与空白对照组相比,转染后24,48,96小时及1周时细胞生长未受影响,siRNA组在转染后24,48小时细胞生长未受明显影响,而96小时及一周时明显抑制。转染siRNA组的细胞的凋亡率与阴性对照组与空白对照组相比显著增加（14.94%±1.60%vs 3.23%±0.46%,4.22%±0.34%,P〈0.05）。结论本实验提示siRNA沉默survivin基因能促进肺癌细胞的凋亡,survivin siRNA基因治疗有可能成为肺癌治疗的新靶点。     

靶向Survivin的siRNA联合吉西他滨抑制胰腺癌细胞增殖

目的 构建靶向Survivin基因的siRNA真核表达载体,观察其对吉西他滨化疗抑制胰腺癌Pane-1细胞增殖的影响.方法 构建靶向Survivin基因的siRNA真核表达载体psiRNA-Survivin,行酶切和测序鉴定.用重组质粒转染Pane-1细胞并筛选稳定转染的细胞株,绘制细胞生长曲线.采用逆转录.聚合酶链反应(RT-PCR)、Western blot检测Survivin的mRNA和蛋白表达变化.以吉西他滨分别作用于对照组和转染组Panc-1细胞24 h,噻唑蓝(MTY)比色法检测细胞的增殖,流式细胞仪检测细胞的凋亡.结果 酶切和测序鉴定表明,成功构建了psiRNA-Survivin重组质粒.重组质粒稳定转染胰腺癌细胞株后,Survivin的mRNA和蛋白表达分别下调了79.2%和83.6%(P<0.05),生长曲线明显变平缓,并能显著增强吉西他滨对Panc-1细胞的增殖抑制[(24.6±4.5)%/(38.7±5.2)%]和凋亡诱导作用[(16.7±2.5)%/(26.8±3.4)%,P<0.05).结论 构建Survivin的siRNA表达载体可明显下调Survivin的表达,抑制Panc-1细胞增殖,并能提高细胞对吉西他滨的化疗敏感性.     

胰腺癌中XIAP和Survivin的表达及其相关性

目的:研究X染色体连锁的凋亡抑制因子(XIAP)和SurvMn在胰腺癌中的表达并探讨二者之间的关系.方法:采用免疫组织化学法对26例胰腺癌组织中XIAP和Survivin的表达进行检测并积分;采用RT-PCT检测胰腺癌细胞Panc-1、AsPC-1中XIAP和Survivin基因的表达.结果:26例胰腺癌组织中XIAP和Survivin的阳性率分别为88.5%(23/26)和92.3%(24/26),其表达积分分别为7.40 4±4.12和8.53±3.83,二者共同阳性率为84.6%(22/26);表达强弱与肿瘤大小均无明显关系;分化越差的肿瘤,二者的表达越高(P<0.05).2株胰腺癌细胞中均有XIAP和Survivin的基因表达.XIAP和Survivin在胰腺癌组织和细胞中均存在相关性(P<0.05).结论:XIAP和Survivin的表达水平均与胰腺癌的分化程度有关,二者在胰腺癌组织和细胞中均存在相关性,可能在胰腺癌的转化以及耐药方面发挥重要作用.     

Expression and significance of multi-drug resistance-associated protein 3 in different tumor cell lines

Objective To investigate the expression and meaning of MRP3 in different tumor cells. MethodsThe monoclonal antibody against MRP3 was used to identify the expression of MRP3 by flow cytometer in seven tumor cells and human embryo kidney cell lines 293T.And RT-PCR was used to detect the mRNA of MRP3 in eight cell lines. ResultsThe mRNA of MRP3 was expressed in three pancreatic carcinoma cell lines.MRP3 protein was observed in BxPC-3 and AsPC-1 cells. ConclusionMRP3 may express in different tumor in tissue-specific manner.BxPC-3 and AsPC-1 may serve as cellular models for in vitro studies on multidrug resistance of pancreatic carcinoma.     

shRNA稳定抑制XIAP和survivin表达对胰腺癌细胞生物学特征的影响

目的:探讨慢病毒载体介导的RNA干扰(RNAi)技术对胰腺癌细胞X-连锁凋亡抑制蛋白(XIAP)和生存素(survivin)的抑制作用及对胰腺癌细胞增殖、凋亡及化疗敏感性的影响。方法:应用pGCSIL-PUR和pGCSIL-NEO分别构建针对XIAP和survivin的shRNA慢病毒载体,转染胰腺癌细胞株SW1990和Panc-1,经嘌呤霉素和新霉素筛选并扩大培养得到稳定转染株;实时荧光定量PCR和Western blot检测胰腺癌细胞内XIAP和survivin的表达;MTT法检测细胞增殖和化疗敏感性;caspase-3/7活性测定和DAPI染色分析细胞凋亡情况。结果:筛选XIAP和survivin的有效干扰靶点后,获得XIAP和survivin表达稳定抑制的SW1990和Panc-1细胞株。MTT检测显示稳定抑制XIAP或survivin后,两种胰腺癌细胞增殖均明显减弱,且两者联合抑制后作用增强;虽然抑制XIAP或survivin后对两种胰腺癌细胞凋亡无明显影响,但能明显增加其对化疗药物(5-FU,吉西他滨)的敏感性,且两者联合抑制后作用明显增强。结论:慢病毒载体介导的靶向XIAP和survivin的RNAi可有效抑制XIAP和survivin的表达,降低胰腺癌细胞的增殖能力并增强其对化疗药物的敏感性,且两者联合具有协同作用。     

肾癌患者外周血中survivin mRNA的表达

目的探讨肾透明细胞癌患者外周血中survivin mRNA的表达及其临床意义。方法用RT-PCR方法检测30例肾透明细胞癌患者、10例正常健康人外周血中survivin mRNA的表达。结果30例肾透明细胞癌患者中有23例外周血中survivin mRNA表达阳性，阳性率为76．7％，与正常健康人（0％）相比差异有统计学意义（P〈0．001）；survivin mRNA的表达与临床分期密切相关（P〈0．01）；随肿瘤组织分化程度的降低，survivin阳性率有增加的趋势，但差异无统计学意义（P〉0．05）。结论肾透明细胞癌患者外周血中survivin mRNA可作为肾透明细胞癌微转移的一个监测指标。     

The Oncofetal Gene Survivin Promotes Cell Proliferation and Survival in Primary Human Osteoblastic Cells

Survivin, the smallest member of the inhibitor of apoptosis gene family, is critical for the regulation of mitosis and maintenance of cell viability during embryonic development and cancer, while not being detectable in most adult differentiated tissues. We know little about whether survivin plays any physiological or pathophysiological role in the adult musculoskeletal system. We studied the expression of survivin in primary human osteoblastic cells and its biological functions in vitro. Survivin was detected by immunoblotting and real-time PCR. Subcellular localization was analyzed by immunofluorescence. Transfection of siRNA and plasmids coding for wild-type survivin was performed to study survivin function, i.e., proliferation and apoptosis assays. Survivin mRNA and protein are expressed in primary human osteoblastic cells. During interphase survivin localizes predominantly to the cytoplasmic compartment, which is relevant for the organization of the spindle apparatus during mitosis. Survivin knockdown resulted in an arrest of the cell cycle at the G(2)/M phase and increased rates of apoptosis. Elevated levels of survivin in primary human osteoblasts enhanced proliferation and cell viability. Taken together, we demonstrate for the first time that survivin is expressed in primary human osteoblastic cells on the mRNA and protein levels. Our results indicate that survivin is a critical factor for cell division and cell viability in primary human osteoblastic cells. Learning more about survivin's role in human osteoblasts could be an important step toward understanding the complex processes involved in bone homeostasis and remodeling.     

Livin基因和Survivin基因联合靶向siRNA诱导结肠癌细胞凋亡的作用

目的探讨Livin基因和Survivin基因联合靶向小干扰（si）RNA对结肠癌细胞增殖及凋亡的影响。方法构建Livin和Survivin联合靶向的siRNA重组表达载体并转染结肠癌细胞．通过RT—PCR和蛋白质印迹方法分别检测Livin和Survivin的表达．通过MTT法检测siRNA对细胞增殖的抑制作用．利用流式细胞仪检测处理后细胞的凋亡效应。结果经酶切鉴定和测序分析证实Livin和Survivin联合靶向的siRNA重组表达载体构建成功。这种联合靶向SiRNA对Livin mRNA及蛋白表达的抑制率分别为27．9％和22．3％．对Survivin mRNA及蛋白表达的抑制率分别为32．2％和40．9％。与对照组相比,联合靶向siRNA可降低肿瘤细胞增殖率．增加细胞凋亡率,但其细胞生长抑制作用和促细胞凋亡作用均弱于单独干扰Livin或Survivin基因．结论Livin和Survivin基因联合靶向siRNA能降低结肠癌细胞中Livin和survivin基因的表达．抑制结肠癌细胞的增殖．并诱导结肠癌细胞的凋亡．但此协同抑制作用较单独干扰Livin或survivin基因为弱。     

survivin启动子与PSMA启动子/增强子在前列腺癌细胞系中的转录活性比较

目的:通过研究并比较前列腺特异性膜抗原(PSMA)基因启动子、增强子和survivin基因启动子在不同前列腺癌细胞系(LNCaP和PC-3细胞)中的转录活性,为前列腺癌的靶向性基因治疗提供依据。方法:采用PCR扩增PSMA基因的启动子、增强子和survivin基因启动子,分别克隆入pGL3-Basic,脂质体转染前列腺癌细胞和张氏肝细胞,检测各启动子在细胞中的转录活性。结果:survivin基因启动子在前列腺癌细胞中均具有较强活性,均明显高于PSMA启动子/增强子,其中S2pro启动活性最强,达到CMV启动子活性的1/3,然而,survivin启动子及PSMA启动子/增强子在肝细胞系中几乎不表达。结论:survivin启动子在前列腺癌细胞中具有较强启动活性,可望成为新的前列腺癌靶向性基因治疗工具。     

miR-567在胰腺癌细胞中的表达及其作用机制

目的:探讨miR-567在胰腺癌细胞中的表达及其作用。方法:采用qRT-PCR检测正常胰腺导管上皮细胞系HPDE6-C7及胰腺癌细胞系Panc-1、AsPC-1、HPAC、BxPC-3中miR-567表达。Panc-1细胞转染miR-567过表达慢病毒载体后,分别用CCK-8法、流式细胞术、划痕愈合实验、qRT-PCR、Western blot法检测细胞增殖、凋亡及迁移能力,以及KPNA4 mRNA与蛋白的表达、凋亡相关蛋白表达的变化。结果:miR-567在胰腺癌细胞系Panc-1、AsPC-1、HPAC、BxPC-3中的表达水平均明显低于正常胰腺导管上皮细胞系HPDE6-C7(均P0.05);miR-567慢病毒转染Panc-1细胞后,增殖能力明显减弱,凋亡率明显增加,划痕愈合率明显降低、KPNA4 mRNA与蛋白表达明显下调、而caspase-3及Bax蛋白表达明显上调(均P0.05)。结论:miR-567在胰腺癌细胞中表达降低,升高其表达可抑制胰腺癌细胞的生长与迁移能力,其机制可能与下调KPNA4并上调凋亡相关蛋白表达有关。     

Survivin 抑制人胆管癌细胞凋亡相关信号通路的实验研究

目的:探讨survivin基因对人胆管癌细胞凋亡信号通路的调节机制.方法:构建针对survivin基因的siRNA和对照siRNA,将QBC939人胆管癌细胞分为3组,分别为siRNA-survivin转染组,对照siRNA转染组和未转染组.转染后,首先用Western blot检测未转染QBC939细胞和QBC939/siRNA(-)细胞及QBC939/siRNA(+)细胞中survivin的表达,验证干扰效果,继而分别用流式细胞仪,激酶活性测定和Western blot检测以上3种状态的QBC939细胞的凋亡情况,caspase-3的活性和caspase-3,caspase-9及procaspase-9凋亡信号分子的表达.结果:QBC939/siRNA(+)细胞survivin蛋白表达量明显低于未转染的QBC939细胞(P＜0.05),而QBC939/siRNA(-)细胞survivin蛋白表达量无明显改变(P＞0.05).与未转染的QBC939细胞比较,QBC939/siRNA(+)细胞凋亡明显增加,caspase-3活性明显升高,caspase-3和caspase-9表达明显上调,而procaspase-9表达降低(均P＜0.05);上述指标在QBC939/siRNA(-)细胞与未转染的QBC939细胞间的差异无统计学意义(均P＞0.05).结论:survivin基因可能通过促进procaspase-9的活化阻止caspase-3和caspase-9的激活,从而抑制胆管癌细胞的凋亡.     

凋亡相关基因Survivin及Caspase-3 mRNA在膀胱移行细胞癌中的表达及其意义

目的探讨凋亡相关基因survivin及Caspase-3 mRNA的表达与膀胱移行细胞癌发生及发展的关系。方法应用逆转录-聚合酶链式反应（RT-PCR）检测33例膀胱移行细胞癌组织中survivin和Caspase-3 mRNA表达的情况，结合临床资料进行分析。结果93．9％（31／33）的肿瘤组织可检测到survivin mRNA表达，而对照组全部阴性表达，二者有统计学意义；81．8％（27／33）的肿瘤标本可检出Caspase-3 mRNA，而对照组中检出率为80％（8／10），实验组与对照组间无明显差异。在Ⅲ级膀胱移行细胞癌中survivin mRNA的表达强度较Ⅰ级为高，二者间有统计学意义（P〈0．05）。survivin和Caspase-3的表达与肿瘤的临床分期无关（P〉0．05）。结论survivin mRNA在膀胱移行细胞癌中有特异性表达，其高表达提示肿瘤分化不良。阻断suvivin mRNA的表达可能为膀胱肿瘤的治疗提供新的途径。     

去雄激素协同辐射诱导前列腺癌细胞凋亡及凋亡通路基因的表达

目的 研究辐射和去雄激素对前列腺癌细胞凋亡通路基因表达的影响，探讨其协同诱导凋亡的机制。方法 辐射与去雄激素作用前列腺癌细胞LNCaP，MTT实验和凋亡细胞染色分别评价细胞毒性和诱导凋亡作用。收集细胞提取总RNA并合成cDNA探针，在凋亡通路特异基因cDNA膜上进行杂交反应检测基因mRNA表达，并以RT-PCR确认有关基因mRNA表达。结果 辐射与去雄激素可协同诱导前列腺癌细胞凋亡。辐射使DFFA、LTbR、mdm2、Myd88、TNFRSF8Ⅱ、TNFRSF14和TNFSF4基因mRNA表达上调，使Survivin和Bar基因mRNA表达下调。去雄激素使Mcl-1、TNFRSF14、MyD88和TNFSF4基因mRNA表达上调，使Bar、Survivin和TRAIL—R3基因mRNA表达下调。结论 去雄激素和辐射对前列腺癌细胞凋亡通路基因的表达改变不同，这与两者协同诱导凋亡作用有关。     

Bcl-XL antisense oligonucleotides coupled with antennapedia enhances radiation-induced apoptosis in pancreatic cancer

BACKGROUND: Pancreatic cancer is highly resistant to radiation and chemotherapy, and its resistance reflects the enhancement of apoptosis inhibitory genes, including Bcl-2 family. Antennapedia (pAnt) is capable of almost 100% internalization into cells through the lipid bilayer without any cytotoxic effect. The aim of this study was to examine the effects of the Bcl-XL antisense oligonucleotide for radiosensitivity of in vitro and in vivo pancreatic cancer using oligonucleotide conjugated with antennapedia. METHODS: In in vitro experiments, expression of Bcl-XL protein was examined in 5 pancreatic cancer cell lines. In AsPC-1 cells, internalization of the oligonucleotide was confirmed, and the effects of antennapedia-antisense (pAnt-AS) or antennapedia-scramble (pAnt-Scr) on Bcl-XL protein expression were examined. Cells were treated with pAnt-AS, pAnt-Scr or phosphorothioate antisense (S-AS) for 3 days, then the effects of irradiation on the cell survival, caspase-3 activity, and apoptotic index were evaluated. In AsPC-1 xenograft mice, pAnt-AS, pAnt-Scr, or S-AS was injected, and 5 or 10 Gy irradiation was added. Bcl-Xl protein expression was measured before irradiation. Apoptosis was evaluated at 48 hours after irradiation. On the 14th day after 10-Gy irradiation, tumor wet weight was measured, and tumor growth was estimated over 5 weeks. RESULTS: In in vitro experiments, all pancreatic cancer cell lines expressed Bcl-XL protein. pAnt-AS was internalized into AsPC-1 cells within 2 hours. pAnt-AS at 10 mumol/L reduced more than 90% of the Bcl-XL protein in AsPC-1 cells, whereas pAnt-Scr or S-AS treatment at the same concentration reduced as much as 10% of the Bcl-XL protein. Treatment with pAnt-AS followed by irradiation significantly reduced cell viability when compared with that of pAnt-Scr or S-AS. Caspase-3 activity was significantly upregulated in the pAnt-AS-treated group (P = .033). The rate of nuclear fragmentation was significantly higher in the pAnt-AS group (P = .013). In in vivo experiments, Bcl-XL protein was reduced about 40% in the pAnt-AS-treated mice. Tumor doubling time of the pAnt-AS-treated mice was elongated by 10-Gy irradiation. The tumor wet weight of mice treated with pAnt-AS and 10-Gy irradiation was significantly reduced when compared with mice treated with pAnt-Scr and 10-Gy irradiation (P = .046). The apoptosis index at 48 hours after irradiation was significantly increased in pAnt-AS-treated mice (P < .01). CONCLUSIONS: The results suggest that, when coupled with antennapedia, the antisense oligonucleotide against Bcl-XL could be a good therapeutic tool for radiosensitization of pancreatic cancer.     

不同剂量的X射线辐照对胰腺癌细胞Survivin表达的影响

目的 观察不同剂量的X线辐照后胰腺癌细胞Survivin表达的变化.方法 胰腺癌细胞室温下经不同剂量的X线辐照处理.实验分为A组:对照组,无照射;B组:2 Gy照射;C组:半致死量4 Gy照射;D组:致死量10 Gy照射.RT-PCR法检测各组Survivin mRNA表达量;MTT法检测胰腺癌细胞增殖抑制率及流式细胞术检查细胞凋亡率.结果 在X线辐照处理后1～2 d,B组与C组的Survivin表达明显增加,且在4 d达到高峰;D组的Survivin表达显著下降.X线照射后第6天,B组与C组的胰腺癌细胞的增殖未受抑制,而D组的增殖受到明显抑制.B组的凋亡率为3%,C组的凋亡率为5%,D组的凋亡率为53%,与B组、C组相比,差异有统计学意义(P<0.01).结论 放疗后诱导的Survivin表达上调可能是胰腺癌细胞对放疗不敏感的重要原因之一.     

长链非编码RNA BCAR4对胰腺癌细胞增殖和凋亡的影响及机制

目的:探讨长链非编码RNA BCAR4(LncRNA BCAR4)在胰腺癌细胞中的表达以及对胰腺癌细胞增殖和凋亡的影响。方法:用qRT-PCR检测胰腺癌细胞系(AsPC-1、HPAC、BxPC-3、Panc-1)和正常胰腺导管上皮细胞系HPDE6-C7中LncRNA BCAR4的表达。将胰腺癌AsPC-1细胞分别转染BCAR4 siRNA序列和阴性对照siRNA序列,以无转染的AsPC-1细胞为空白对照,用CCK-8和流式细胞术检测细胞的增殖和凋亡,Western blot检测细胞中mTOR与P70S6K及磷酸化mTOR(p-mTOR)与磷酸化P70S6K(p-P70S6K)蛋白的表达。结果:LncRNA BCAR4在各胰腺癌细胞系中的相对表达量均明显高于正常胰腺导管上皮细胞系HPDE6-C7(均P0.05);AsPC-1细胞转染BCAR4 siRNA后表现为增殖能力明显降低、凋亡率明显升高、p-mTOR及p-P70S6K蛋白相对表达量明显降低(均P0.05)。结论:LncRNA BCAR4在胰腺癌细胞中表达升高,LncRNA BCAR4的高表达可促进胰腺癌细胞增殖抑制凋亡,机制可能与LncRNA BCAR4上调mTOR/P70S6K通路的磷酸化水平有关。