Preliminary study of the in vitro growth inhibition of human bladder cancer cell line BIU-87 by arsenic trioxide

Arsenic trioxide (As,O, ) is the major effectivecomponent of Pishuang. Because of its toxic and sideeffects, it was not widely used in clinic for a lOng period. In addition, it was believed that arsenic compound could result in chromosome abnormality, sis…     

RNA干扰沉默MTA1基因对膀胱癌细胞失巢凋亡的影响

目的： 观察RNA干扰沉默MTA1基因对膀胱癌细胞株BIU-87增殖和失巢凋亡的影响。方法： 构建针对MTA1基因的小干扰RNA（small interfering RNA, siRNA）,应用MTA1 siRNA转染处理人膀胱癌细胞株BIU-87后,分别采用实时定量PCR和蛋白质印迹法检测MTA1基因mRNA和蛋白的表达,采用软琼脂集落培养试验检测锚着不依赖性增殖,琼脂糖凝胶电泳和流式细胞术检测BIU-87细胞失巢凋亡。结果： 与对照组比较,MTA1 siRNA转染组MTA1 mRNA和蛋白水平明显下降,且呈浓度依赖性（P<0.01）。MTA1 siRNA转染组软琼脂集落形成数明显减少,且与浓度相关（P<0.01）。琼脂糖凝胶电泳和流式细胞术结果显示,MTA1 siRNA转染可诱导BIU-87细胞失巢凋亡,且与浓度相关（P<0.01）。结论： MTA1 siRNA可抑制膀胱癌细胞株BIU-87增殖,诱导失巢凋亡可能是其机制之一。     

PTEN基因转染对人膀胱癌细胞BIU-87凋亡的影响

目的：研究外源性抑癌基因PTEN转染对人膀胱癌细胞系BIU-87凋亡的影响,探索膀胱癌基因治疗的新途径.方法：将携有PTEN基因的真核表达载体体外转染BIU-87细胞,筛选稳定转染的细胞并扩增培养,用逆转录聚合酶链反应法（RT-PCR）检测PTEN的表达情况,应用细胞原位凋亡检测试剂盒和流式细胞仪分别研究PTEN基因转染前、后膀胱癌细胞凋亡的变化.结果：转染PTEN基因的膀胱癌细胞系BIU-87中PTEN mRNA能稳定表达,肿瘤细胞凋亡明显增多,与对照组比较有显著性差异.结论：转染外源性PTEN基因能显著诱导膀胱癌细胞凋亡,从而达到抑制肿瘤发生、发展的目的.     

榄香烯联合热疗诱导膀胱癌BIU-87细胞凋亡及对p-Akt表达的影响

目的探讨榄香烯联合热疗诱导人膀胱癌细胞株-87（BIU-87）膀胱癌细胞凋亡及对磷酸化丝氨酸苏氨酸蛋白激酶（p-Akt）蛋白表达的影响。方法采用流式细胞仪和透射电子显微镜分析和观察不同浓度榄香烯与热疗单独或联合对BIU-87膀胱癌细胞作用结果;Westernblotting检测榄香烯（40mg／L）与热疗单独或联合作用于人BIU膀胱癌细胞24h后p-Akt蛋白的表达。结果榄香烯联合热疗处理后BIU-87细胞超微结构出现明显的凋亡形态学改变,不同浓度的榄香烯组、热疗组和榄香烯联合热疗组作用于人BIU-87膀胱癌细胞24h均可使细胞凋亡率增加,但榄香烯联合热疗组的作用显著强于前两者;凋亡率增加的同时下调了p-Akt蛋白的表达。结论榄香烯联合热疗可诱导人BIU-87膀胱癌细胞凋亡,且过程中下调了p-Akt蛋白的表达。     

PTEN基因对人膀胱癌细胞系BIU-87化疗敏感性影响的研究

目的研究抑癌基因PTEN转染对人膀胱癌细胞系BIU-87化疗敏感性的影响。方法将携有PTEN基因的重组真核表达质粒pBp-PTEN体外转染BIU-87细胞（pBp-PTEN-BIU87）,筛选稳定转染的细胞并扩增培养,以转染了空质粒pBp的BIU-87细胞（pBp-BIU87）和正常BIU-87细胞为对照,用RT-PCR检测PTEN的表达情况,应用MTT分别研究转染前、后膀胱癌细胞对不同浓度抗癌药物丝裂霉素MMC（1、10和100g/mL）、康朴赛星（0.25、2.5和25g/mL）和吡柔比星（2、20和200g/mL）的抑制率和敏感性的变化。结果 RT-PCR证实PTEN在转染的BIU-87细胞中能稳定表达。PTEN转染后,BIU-87细胞对MMC的药物抑制率和敏感性明显提高,对吡柔比星和康朴赛星的药物抑制率和敏感性无明显变化。结论 PTEN基因转染能提高人膀胱癌细胞系BIU-87对某些抗癌药物的敏感性,作用的强弱取决于药物的作用机制。     

联合RNA干扰TR及TERT对膀胱移行细胞癌BIU-87细胞株端粒酶活性及其增殖的影响

目的 探索联合RNA干扰TR及TERT[小型干扰RNA(siRNA)、人端粒酶RNA(hTR)及人端粒酶逆转录酶(hTERT)]基因对膀胱移行细胞癌细胞株BIU-87端粒酶活性及其增殖的影响.方法 根据hTRmRNA和hTERTmRNA的序列,分别设计合成3对不同的且能干扰TR和TERT基因表达的siRNA并筛选出最高效抑制序列(pRNAT-TR-Ⅲ、pRNAT-TERT-Ⅲ),构建以hTR、hTERT基因为靶点的联合RNA干扰装置pRNAT-TR-Ⅲ、pRNAT-TERT-Ⅲ(脂质体法)并将其转染BIU-87细胞株,采用荧光定量PCR分析hTR及hTERT mRNA表达,TRAP-ELISA检测端粒酶活性,MTT法检测细胞增殖.结果 分别及联合RNA干扰hTR及hTERT基因后,pRNAT-TERT-Ⅲ,pRNAT-TR-Ⅲ及pRNAT-TERT-Ⅲ、pRNAT-TR-Ⅲ的联合干扰可以特异性抑制BIU-87细胞株中TERT和TR表达(分别减少pRNAT-TERT-Ⅲ TERTmRNA:67%、pRNAT-TR-Ⅲ TRmRNA:41%、pRNAT-TERT-Ⅲ、pRNAT-TR-Ⅲ TRmRNA:57%、pRNAT-TERT-Ⅲ、pRNAT-TR-Ⅲ TERTmRNA:70%.P＜0.05).且膀胱移行细胞癌细胞株BIU-87的生长和端粒酶活性均明显受到抑制,以联合RNA干扰尤为明显(pRNAT-TERT-Ⅲ:1.80±0.014,pRNAT-TR-Ⅲ:1.95±0.016,pRNAT-TERT-Ⅲ、pRNAT-TR-Ⅲ:1.25±0.012,P＜0.05).结论 联合RNA干扰hTERT及hTR基因能更明显抑制膀胱移行细胞癌BIU-87细胞株的生长,为其临床应用奠定了基础.     

沉默核糖核酸酶抑制因子促进膀胱癌BIU-87细胞生长和转移潜能

目的研究沉默核糖核酸酶抑制因子(ribonuclease inhibitor,RI)基因表达,对人膀胱癌BIU-87细胞增殖和侵袭能力及肿瘤生长的影响。方法通过用RI mRNA的特异性siRNA表达载体和无同源性的对照载体,在脂质体介导下稳定转染膀胱癌BIU-87细胞,通过筛选、鉴定后,用Am-blue法检测细胞增殖能力及用Western blot分析细胞中MMP-2和MMP-9的表达。将siRNA RI BIU-87(实验组)及对照组细胞皮下注射到BALB/c裸鼠中,观察肿瘤的生长和肿瘤微血管密度的变化,以及nm23-H1和E-cadherin在肿瘤中的表达。结果 RI基因表达下调显著增加了细胞的增殖,而且显著增强了MMP-2和MMP-9的表达。动物实验结果显示,实验组显著促进了肿瘤的生长(促瘤增长率31.85%),具有更大的瘤质量和更高的肿瘤微血管密度以及更低的nm23-H1和E-cadherin的表达。结论抑制RI基因的表达能显著提高膀胱癌细胞的生长和侵袭潜能,RI可能作为治疗膀胱癌的靶蛋白。     

Effects of Gene Tranfection with CH50 Polypeptide on the Invasion Ability of Bladder Cancer Cell Line BIU-87

Fibronectin(FN) ,a glycoprotein,possesses mul-tiple cell bioactivities such as influencing the cellularmorphology, controlling cellular migration,inducingcellular differentiation and affecting i mmune cell func-tions etc ,whichis closelyrelated withthe carcinogene-sis ,invasion and metastasis[1].CH50 polypeptide is composed of Cell I andHep II bifunctional-domain of human FN, main-tains the function of the original structure and doesnot formnovel function because of deletion of frag-ments a…     

RNA干扰人端粒酶逆转录酶基因对膀胱尿路上皮癌BIU-87细胞株端粒酶活性抑制的研究

目的:探讨RNA干扰技术使人端粒酶逆转录酶(hTERT)基因沉默,对膀胱尿路上皮癌BIU-87细胞株端粒酶活性的抑制作用。方法:针对hTERT基因设计构建多种siRNA表达载体,并转染至膀胱肿瘤BIU-87细胞,通过实时荧光定量、单四唑(MTT)检测端粒酶活性,观察siRNA表达载体对hTERT基因表达的影响。结果:实时荧光定量和MTT检测证明,所构建的载体能导致不同程度的hTERT基因沉默,并成功地抑制BIU-87细胞的生长。结论:RNA干扰膀胱尿路上皮癌细胞(BIU-87)端粒酶hTERT基因,能影响端粒酶基因的表达,为进一步研究端粒酶活性在膀胱尿路上皮癌中的作用奠定了基础。     

RNA干扰HER2/neu对膀胱癌BIU-87细胞增殖和凋亡的影响

目的研究靶向HER2/neu基因的siRNA对膀胱癌BIU-87细胞增殖和凋亡的影响。方法化学合成的靶向HER2/neu基因siRNA在脂质体的介导下转染BIU-87细胞,实验分为HER2/neu siRNA组、空脂质体组、阴性siRNA序列组,以未转染BIU-87细胞为空白对照组。利用CCK-8法评价HER2/neu基因siRNA对BIU-87细胞体外生长的抑制作用,流式细胞术检测细胞凋亡情况,通过逆转录聚合酶链反应(RT-PCR)和Western blot法检测转染前后细胞中HER2/neu mRNA和蛋白表达水平的变化。结果转染HER2/neu siRNA后BIU-87细胞的存活率显著下降,从(82.37±0.90)%降低到(56.76±1.70)%,差异有统计学意义(P<0.05);同时能诱导细胞凋亡,HER2/neu siRNA组凋亡率达(45.60±0.70)%,与空白对照组、空脂质体组、阴性siRNA序列组比较差异有统计学意义(P<0.05);靶向HER2/neu基因siRNA能显著降低BIU-87细胞中HER2/neu mRNA和蛋白的表达(P<0.05)。结论化学合成的靶向HER2/neu基因siRNA能有效抑制HER2/neu基因在BIU-87细胞中的表达,进而能有效抑制BIU-87细胞的增殖和诱导凋亡的作用。     

Apoptosis inducing effects of arsenic trioxide on human bladder cancer cell line BIU-87

Objective　To explore the apoptosis inducing effects of arsenic trioxide (As2O3) on human bladder cancer cells and elucidate possible mechanisms. Methods　After treatment with As2O3, the growth inhibition rates of human bladder cancer cell line BIU-87 were studied by MTT and cell counts methods. DNA synthesis rates were detected by 3　H-TdR assay. The morphological changes of cancer cells were observed by light and electronic microscopy and cell apoptosis rates were detected by TdT-mediated dUTP nick end labeling (TUNEL). bcl-2 gene expression of BIU-87 cells was observed by strept avidin-biotin complex (SABC) immunohistochemical method. Results　As2O3 could effectively inhibit the growth of BIU-87 (P&lt;0.05), which were time and concentration dependent. The inhibition rate of 4.0?μmol/L As2O3 for DNA synthesis of cancer cells was 55.64% (P&lt;0.01). Partial cancer cells presented the characteristic morphological changes of apoptosis which depended on the time of exposure to drug (P&lt;0.05). bcl-2 expression of BIU-87 cells was decreased significantly (P&lt;0.05). Conclusion　As2O3 can significantly induce apoptosis in bladder cancer cells by down-regulating the expression of the bcl-2 gene and inhibiting DNA synthesis. This provides a potentially effective method for prevention and cure of human bladder cancer.     

光动力作用对膀胱癌细胞线粒体相关调控蛋白Bcl-2/Bax表达的影响

目的探讨激光活化BPD-MA光动力诱导肿瘤细胞凋亡的可能机制.方法应用免疫组织化学染色检测激光活化BPD-MA光动力作用后人膀胱癌细胞BIU-87线粒体相关调控蛋白Bcl-2和Bax蛋白表达水平.结果激光活化BPD-MA光动力作用后膀胱癌细胞线粒体相关调控蛋白Bcl-2表达显著低于对照组(P<0.05),而Bax蛋白表达水平无明显改变(P>0.05),但Bax/Bcl-2 比值较对照组明显上升(P<0.05).结论激光活化BPD-MA光动力作用后人膀胱癌细胞BIU-87线粒体相关调控蛋白Bcl-2表达水平的下降、Bax/Bcl-2比值的上升.激光活化BPD-MA光动力作用可能通过调控线粒体相关调控蛋白Bcl-2和Bax蛋白表达水平诱导人膀胱癌细胞株BIU-87发生凋亡.     

特异性ILK siRNA对膀胱癌移植瘤生长及p-Akt、p-GSK3β表达的影响

目的 探讨应用整合素连接激酶（integrin-linked kinase,ILK）特异siRNA沉默ILK基因的表达对膀胱癌裸鼠移植瘤生长及p-Akt、p-GSK3β表达的影响。方法实验分3组：BIU-87细胞组（正常BIU-87细胞）、BIU-87-NC组（转染阴性对照质粒的BIU-87细胞）、BIU-87 siR...     

保尔佳对膀胱癌BIU-87细胞株增殖及超微结构影响

1目的　探讨保尔佳对膀胱癌细胞生长的抑制作用。 2方法　采用 MTT法检测了不同浓度的保尔佳对膀胱癌 BIU- 87细胞株生长的抑制作用 ,同时应用电镜观察保尔佳对 BIU- 87细胞超微结构的影响。 3结果保尔佳对 BIU- 87细胞株生长增殖有明显的抑制效应 (r=0 .882 ,0 .991,P<0 .0 5 ,0 .0 1) ,且随着药物浓度增高和作用时间的延长而加强。实验组 BIU- 87细胞也出现一定的超微结构改变。 4结论　保尔佳可抑制肿瘤细胞的生长     

CH50多肽在膀胱癌细胞系BIU-87中的表达和鉴定

目的：研究CHS0多肽真核表达载体pCH510体外转染膀胱癌细胞系BIU-87以及CHSO多肽的表达和鉴定。方法：以脂质体Lipofectimine^TM2000为介导，将pCH510质粒体外转染给BIU-87细胞，用免疫组化S-P法、Western Blot法鉴定CH50多肽的表达，RT—PCR法鉴定导入基因的表达。结果：转染pCH510质粒的BIU-87细胞明显阳性表达CH50多肽，对照组则不表达。结论：BIU-87细胞体外转染pCH510质粒后能表达CH50多肽，改变了癌细胞的黏附属性，为临床治疗膀胱癌提供了新的途径。     

Evaluation of tumor formation of three bladder cancer cell lines in nude mice

This study examined the differences in tumor formation of three bladder tumor cell lines (BIU-87, T24 and EJ) after subcutaneously transplanted into nude mice, in order to find the best technique for establishing in vivo bladder tumor model. BIU-87, T24 and EJ cells at logarithmic phase were re-suspended in serum-free medium. The cells suspensions of the identical concentration were subcutaneously transplanted into nude mice and then the success rate and tumor growth were compared among the three cell groups. The results of tumor formation were pathologically evaluated. Lung, liver and kidney tissues were also pathologically examined for distant metastasis. The proliferation of the three cells were determined by immunohistochemically detecting the PCNA expression in the tumors. The results showed that the success rates of EJ and T24 cells were significantly higher than that of BIU-87 cells and no distant metastasis was noted among the three groups. The proliferation levels of EJ and T24 cells was significantly higher than that of BIU-87. But at the later stage of tumor formation, as compared with T24 cells, EJ grew more vigorously, soon resulting in the central necrosis of tumor, which affected the measurement of the actual size of the tumors. Moreover, PCNA staining exhibited that the proliferation of EJ and T24 was significantly higher than that of BIU-87 cells. It is concluded that as compared with BIU-87 cells, EJ and T24 cells had higher success rates, with not significant differences in death rate and distant metastasis found among them. There existed no significant difference in tumor formation between EJ and T24 cells and T24 cells do not rupture easily, which makes it a better cell line for the establishment of in vivo bladder tumor model.     

转基因法建立膀胱癌多药耐药细胞株

目的:建立高效、稳定的人膀胱癌多药耐药性细胞模型。方法:采用基因重组技术构建真核表达载体pcDNA3.1( )/bcl-2,通过脂质体将人bcl-2基因转染膀胱癌细胞BIU-87,RT-PCR检测基因转录水平,应用MTT比色法进行耐药性检验。结果:酶切鉴定和基因测序证明真核表达载体pcDNA3.1( )/bcl-2构建成功;RT-PCR分析表明,转染bcl-2基因的BIU-87/bcl-2细胞的bcl-2基因表达水平较BIU-87细胞和转染空载体的BIU-87/neo细胞显著提高;与BIU-87细胞和BIU-87/neo细胞相比,BIU-87/bcl-2细胞具有较高的耐药性。结论:基因转染法是建立人膀胱癌多药耐药细胞模型的理想方法。     

藏红花素对人膀胱移行细胞BIU-87细胞抗增殖作用研究

目的 研究藏红花素(crocin)对人膀胱移行细胞株BIU-87增殖的作用及机制.方法 MTT法测定crocin抗增殖效应,FCM分析细胞周期分布,RT-PCR技术测定Cyclin D1, p27kip1 mRNA表达变化,Western blot检测Cyclin D1,p27kip1蛋白表达变化.结果 crocin对细胞生长有抑制作用,且呈时间-剂量依赖关系.FCM检测显示,crocin可使细胞阻滞于G0/G1期;3.2mmol/L crocin作用于BIU-87细胞后RT-PCR结果显示,Cyclin D1 mRNA表达明显下调,p27 mRNA无显著变化;Western blot结果表明Cyclin D1蛋白明显下调;p27kip1蛋白表达显著增加.结论 crocin对细胞有抗增殖作用,可阻滞细胞于G0/G1期,其可影响Cyclin D1 mRNA转录,但并不影响p27 mRNA表达水平,并调控Cyclin D1、p27kip1蛋白表达.