LAMP1在膀胱癌细胞中的表达及对肿瘤细胞迁移的影响

目的:探讨溶酶体膜相关蛋白LAMP1(Lysosomal-associated membrane proteins 1,CD107a)在膀胱癌细胞系和正常膀胱上皮细胞系中表达情况,检测其与膀胱癌细胞迁移关系,推测其对膀胱癌进展的影响。方法:采用RT-PCR检测正常膀胱上皮细胞系和膀胱癌细胞系LAMP1表达;免疫荧光明确其蛋白表达定位;采用RNAi方法对LAMP1敲减,然后通过划痕实验检测其对肿瘤细胞迁移影响。结果:膀胱癌细胞系5637和UMUC3均表达LAMP1,正常移行上皮细胞系SV-HUC-1不表达;LAMP1蛋白定位在肿瘤细胞胞浆中;LAMP1敲减后膀胱癌细胞迁移减慢。结论:LAMP1参与膀胱癌发生发展过程,促进癌细胞迁移。     

锌指E-盒结合同源异形盒-1在膀胱癌细胞中的表达及对肿瘤细胞侵袭的影响

目的:锌指E-盒结合同源异形盒-1(ZEB1)是上皮-间质转换的重要调控因子。本研究探讨ZEB1在膀胱癌细胞系中的表达情况,以及对膀胱癌发展与转移的影响。方法:采用RT-PCR检测膀胱癌细胞系ZEB1的表达,免疫荧光检测ZEB1蛋白表达定位;转染ZEB1siRNA后通过RT-PCR与Western Blot检测ZEB1的mRNA与蛋白表达变化;以及通过细胞侵袭实验观察ZEB1影响细胞侵袭能力的变化。结果:膀胱癌细胞系UMUC3和5637均表达ZEB1,SV-HUC-1不表达ZEB1;ZEB1蛋白定位于胞核;ZEB1敲低后,其mRNA与蛋白表达降低,膀胱癌细胞系侵袭能力降低。结论:膀胱癌细胞系UM-UC3和5637可用于ZEB1与肿瘤相关的机制研究;ZEB1促进膀胱癌细胞侵袭。     

LIN28在膀胱癌和膀胱癌细胞系中的表达及意义

目的：探讨LIN28在膀胱癌组织和细胞系中表达情况,以及与mieroRNA初级Let-7g（pri—Lev7g）之间关系,推测其可能临床意义及对肿瘤进展的影响。方法：采用常规RT-PCR、miRNA转录、免疫荧光和免疫组化方法,检测LIN28mRNA和pri-Let-7g表达,以及LIN28蛋白表达定位。结果：2例膀胱癌细胞系均表达LIN28mRNA,T24表达较强,免疫荧光显示这两个细胞系均表达LIN28蛋白,阳性部位位于细胞胞质,T24荧光强度强于5637。所选10例膀胱癌和相应癌旁组织均表达LIN28mRNA,二者并无明显不同,与临床分级也无明确关系。免疫组化显示癌组织LIN28表达阳性并定位于胞质,而癌旁正常组织LIN28表达为阴性。此外,两个细胞系pri—Let-7g表达较强,而癌和癌旁组织的pri—Let-7g表达强度无明显差异,需进一步检测其成熟Let-7g在这些组织中是否存在不同,以明确这些miRNA是否发生生物合成的转录后阻断。结论：明确T24和5637两个膀胱癌细胞系均可作为研究LIN28、Let-7与其相应靶基因关系的体外实验模型。尽管并不确定膀胱癌和癌旁组织LIN28、Let-7g表达强度与临床分级是否相关,但至少明确LIN28／LIN28在膀胱癌中表达,为探讨LIN28和Let-7在泌尿系统来源的其他恶性肿瘤中的作用提供借鉴和实验依据。     

lncRNA BLACAT1通过靶基因调控膀胱癌细胞发生发展的机制研究

目的探讨长链非编码RNA膀胱癌相关转录本1(lncRNA BLACAT1)通过靶基因调控膀胱癌细胞发生发展的机制。方法采用qRT-PCR法检测正常膀胱细胞SV-HUC-1及膀胱癌细胞SW780中BLACAT1的表达水平;转染siRNA-NC、siRNA-BLACAT1至SW780细胞, 设为siRNA-NC、siRNA-BLACAT1组, 保留细胞不转染任何质粒设为空白对照组(NC组)。采用CCK-8法检测SW780细胞的增殖情况, 采用流式细胞术检测SW780细胞的凋亡情况, 采用双荧光素酶报告基因和qRT-PCR验证lncRNA BLACAT1的靶向基因, 采用免疫印迹法检测BAMBI蛋白的表达量。结果 LncRNA BLACAT1在膀胱癌细胞SW780中的表达水平显著高于正常膀胱上皮细胞SV-HUC-1, 差异有统计学意义(P<0.05);siRNA-BLACAT1组中lncRNA BLACAT1 mRNA水平均低于siRNA-NC组、NC组(均P<0.05), 而siRNA-NC组中lncRNA BLACAT1 mRNA水平低于NC组(P<0.05);三组SW...     

MTUS2-AS2在膀胱癌组织中的表达及对膀胱癌细胞增殖和侵袭的影响

目的:探讨长链非编码RNA(lncRNA)MTUS2-AS2在膀胱癌组织中的表达及其对膀胱癌细胞增殖和侵袭的影响。方法:荧光实时定量PCR(qRT-PCR)检测63例膀胱癌组织和癌旁组织、膀胱癌细胞系(BIU-87、J82、T24、5637)和正常膀胱上皮细胞系SV-HUC-1中的MTUS2-AS2表达。以MTUS2-...     

miR-802负调控CYLD促进膀胱尿路上皮癌病理发生与发展

目的:本研究主要是miR-802促进上皮-间质转化(EMT)的发展抑制CYLD激活NF-κB信号通路,促进膀胱尿路上皮癌发生与发展。方法:qRT-PCR检测miR-802在膀胱尿路上皮癌肿瘤组织和癌旁正常组织中的表达,膀胱尿路上皮癌细胞系(T24、5637、J82、BIU-87、SW870、UM-CM-3)与非肿瘤正常尿路上皮细胞系SVHUC-1的表达及与临床特征因素的相关性;预测靶基因CYLD,用荧光素酶报告基因法及Western blot检测与miR-802的调控关系;Western blot检测3种EMT相关蛋白表达水平(E-cadherin、N-cadherin及Vimentin)与miR-802的相关性;qRT-PCR检测127例膀胱尿路上皮癌肿瘤组织和癌旁正常组织及膀胱尿路上皮癌细胞系T24、5637、J82、BIU-87、SW870、UM-CM-3与非肿瘤正常尿路上皮细胞系SV-HUC-1中的CYLD mRNA表达;Western blot检测膀胱尿路上皮癌肿瘤组织中CYLD蛋白表达水平;用CCK8法、流式细胞法、Tranwell迁移实验检测了膀胱尿路上皮癌细胞系T24的增殖、迁移及周期S期的聚集;采用Western blot检测CYLD及TNF-α对NF-κB信号通路及相关分子的调控作用。结果:miR-802在膀胱尿路上皮癌患者及膀胱尿路上皮癌各株细胞系中表达均呈现升高趋势,而同时与危险因素分级、TNM分期、淋巴结转移也呈现正相关;miR-802mimics转染组较miR-NC对照组CYLD蛋白的表达量明显降低;miR-802过表达导致N-cadherin与Vimentin的蛋白表达显著升高,而E-cadherin的表达显著降低;CYLD可以作用于膀胱尿路上皮癌,对其有抑制效果;miR-802通过促进EMT的发展,而促进膀胱尿路上皮癌细胞的增殖、迁移及周期S期的聚集,但该效果被CYLD回补;CYLD抑制NF-κB信号通路活性。结论:miR-802促进EMT的发展抑制CYLD激活NF-κB信号通路,促进膀胱尿路上皮癌发生与发展,本研究miR-802有可能成为诊断和预测膀胱尿路上皮癌的潜在生物标志物。     

膀胱癌组织中Wnt拮抗因子分泌型卷曲相关蛋白1甲基化和异常表达的意义

目的 探讨Wnt拮抗因子分泌型卷曲相关蛋白1(SFRP1)甲基化和表达在膀胱癌发病机制中的作用. 方法 采用甲基化特异性聚合酶链反应检测人膀胱癌细胞株T24、5637和SCaBER及45例膀胱癌组织和对应癌旁正常组织的SFRP1基因甲基化状态,蛋白质印迹方法检测SFRP1蛋白表达. 结果 SFRP1在膀胱癌细胞株T24和5637中呈现甲基化状态,而SCaBER细胞未检出SFRP1甲基化.将去甲基化试剂5’-氮杂-脱氧胞苷酸(1μg/ml)加入发生甲基化的膀胱癌细胞株T24和5637后,细胞SFRP1 mRNA和蛋白出现表达.45例膀胱癌组织中SFRP1甲基化表型28例(62.2％),癌旁正常组织6例(13.3％),组间频率差异有统计学意义(P＜0.01). 结论 SFRP1甲基化及表达下调可能参与了膀胱癌的发病过程.     

下调DNA解旋酶BLM对膀胱癌细胞化疗药物敏感性的研究

目的:探讨下调DNA解旋酶BLM对膀胱癌细胞化疗药物敏感性的影响。方法:采用脂质体转染技术将BLM-siRNA转染入膀胱癌细胞株RT112、5637和J82中,利用RT-qPCR和Westernblot方法检测BLM的mRNA和蛋白表达情况,借助CCK-8法检测吡柔比星和顺铂对膀胱癌细胞的半数抑制率浓度及化疗药敏感性。结果:吡柔比星和顺铂作用于三种膀胱癌细胞株,随着药物浓度的增加和作用时间的延长,三种膀胱癌细胞株的增殖逐渐降低。与对照组比较,下调膀胱癌细胞内BLM后,BLM的mRNA和蛋白表达均明显降低,且在吡柔比星和顺铂作用下细胞增殖较对照组也明显降低,差异均有统计学意义(P0.05)。结论:下调BLM可增加人膀胱癌细胞对化疗药物的敏感性。     

极低密度脂蛋白受体基因促进膀胱癌细胞迁移的作用及机制

目的:探讨极低密度脂蛋白受体(VLDLR)对人膀胱癌细胞迁移活性的影响及机制。方法:采用实时荧光定量反转录-聚合酶链反应(RT-qPCR)检测人源膀胱癌细胞(J82、UMUC3与T24)与正常尿路上皮细胞(SV-HUC-1)VLDLR的表达水平;采用小干扰RNA(siRNA)建立VLDLR敲低T24细胞模型,通过划痕实...     

长链非编码RNA PTENP1在膀胱癌中的表达调控及功能研究

目的:探索长链非编码RNA PTENP1在膀胱癌中的表达调控及其对膀胱癌细胞的生长及转移的影响。方法:在膀胱癌细胞系及组织中应用逆转录实时定量PCR检测长链非编码RNA PTENP1的基础表达。通过甲基化抑制剂5-Aza.dc处理膀胱细胞系后甲基化特异性PCR分析PTENP1基因启动子的甲基化状态。应用逆转录实时定量PCR检测细胞转染效率,细胞增殖实验及迁移侵袭实验检测PTENP1对膀胱癌细胞增殖、迁移和侵袭的影响。结果:膀胱癌细胞系SCABER、HT-1376、J82、EJ、T24及5637细胞以及膀胱癌临床标本里长链非编码RNA PTENP1与其对照组细胞系和临床标本相比表达减低。并通过在膀胱癌若干细胞系和一定量的临床标本中行MSP检测验证了PTENP1基因存在启动子的甲基化,5-Aza.dc处理细胞系后可以回复或者部分回复PTENP1的表达。增殖及转移实验提示PTENP1能够抑制膀胱癌细胞的增殖细胞迁移和侵袭。结论:膀胱癌中PTENP1基因DNA甲基化参与了PTENP1低表达的调节;PTENP1在膀胱癌起抑癌基因样作用,参与膀胱癌的发生发展。     

LncRNA DANCR regulates lymphatic metastasis of bladder cancer via the miR-335/VEGF-C axis

BackgroundSubstantial evidence indicate that long non-coding RNA (lncRNA) and microRNA (miRNA) act as key role in bladder cancer. Differentiation antagonistic ncRNA (DANCR) could be used as a biomarker in the occurrence and development of cancer. This study aims to explore the mechanism of DANCR/miR-335/VEGF-C axis affecting lymphatic metastasis of bladder cancer.MethodsqRT-PCR detects the expression of DANCR in bladder cancer cell lines (SW780, 5637, T24, UM-UC-3) and normal bladder cell lines (SV-HUC-1), and selects T24 cell lines for subsequent experiments. The expression levels of DANCR, miR-335 and VEGF were measured by qRT-PCR, and the dual luciferase reporter gene verified the targeted regulation of DANCR on miR-335 and miR-335 on VEGF. CCK-8, Transwell and Wound healing assay detect the proliferation, invasion and migration ability of bladder cancer cells, Endothelial cell adhesion assay and Western blot further prove the lymphatic metastasis of bladder cancer.ResultsIn this study, DANCR was highly expressed in bladder cancer cell lines. Transfection of si-DANCR significantly inhibits the proliferation, migration, invasion and lymphatic metastasis of bladder cancer cells. Dual luciferase assay confirmed that DANCR targets miR-335/VEGF-C. Transfection of miR-335 mimic promotes the proliferation, migration, invasion and lymphatic metastasis of bladder cancer cells, overexpression of DANCR eliminates the promotion of miR-335 mimic on bladder cancer cells. Further experiments proved that inhibition of miR-335 and overexpression of VEGF-C can reverse the inhibitory effect of silencing DANCR on bladder cancer cells.ConclusionsIn bladder cancer, DARCR plays an important role, which regulates the proliferation, migration, invasion and lymphatic metastasis of bladder cancer cells through the miR-335/VEGF-C molecular axis.     

Inhibition of presenilins attenuates proliferation and invasion in bladder cancer cells through multiple pathways

ObjectivePresenilin (PS)/γ-secretase is a key protease that initiates various biological processes. We investigated the effect of PS/γ-secretase on the expression and inhibition of urothelial cell carcinoma of bladder (UCB) as a potential alternative therapeutic target for UCB.Materials and methodsPS-1 and PS-2 were identified in normal and malignant human bladder transitional cells by immunohistochemistry. We blocked PSs using a PS/γ-secretase inhibitor N-(N-[3,5-difluorophenacetyl]-L-alanyl)-S-phenylglycine-t-butylester (DAPT), and the proliferative and invasive potential of UCB cells SW780, BIU-87, 5637, and T24, and human normal urothelial cell line SV-HUC-1 were analyzed using Western blot, cell viability test, flow cytometry, and transwell assay. All experiments were repeated at least 3 times.ResultsHuman bladder samples of UCB, SW780, BIU-87, 5637, and T24 cells expressed higher PS-1 compared with normal ones. Cell vitality test demonstrated that DAPT attenuated UCB cell proliferation more than SV-HUC-1. Flow cytometry and transwell assay showed that T24 cells were arrested at G1/S checkpoint and its invasive ability was impaired. Western blot assay markedly showed that protein levels of CD44-intracellular domain, insulinlike growth factor-1Rβ, extracellular regulated protein kinase 1/2, cyclin D1, proliferating cell nuclear antigen, and matrix metalloproteinase-9 were downregulated by DAPT, whereas vascular endothelial growth factor receptor-2 and vascular endothelial growth factor-165 were upregulated.ConclusionsOur study revealed that PS-1 might be implicated in the proliferation and invasion of UCB, and that it may serve as a potential therapeutic target for UCB, but further studies are warranted to verify the effects of inhibition of PS/γ-secretase on angiogenesis.     

Epidermal growth factor receptor targeting of replication competent adenovirus enhances cytotoxicity in bladder cancer

PURPOSE: We evaluated the delivery and oncolytic potential of targeted replication competent adenoviruses in bladder cancer lines. MATERIALS AND METHODS: Seven established human bladder cancer tumor lines (5637, SW800, TCCsup, J82, Scaber, T24 and 253J) were studied for the expression of integrins alpha(v)beta3, alpha(v)beta5, Coxsackievirus and adenovirus receptor, epidermal growth factor receptor (EGF-R) and epithelial cell adhesion molecule antigens using flow cytometry analysis. Bispecific single chain Fv fragments were used to target replication deficient luciferase reporter adenovirus to EGF-R (425-s11) or to epithelial cell adhesion molecule (C28-s11) antigens. Moreover, a fiber modified adenovirus targeting alpha(v)-integrins was studied. Replication competent serotype-5 adenoviruses attenuated to replicate specifically in retinoblastoma pRb (Ad5-d24) or p53 deficient (Ad5-d55K) cells were tested in vitro for oncolytic properties. RESULTS: Low to absent Coxsackievirus and adenovirus receptor expression was found in 5 of the 7 tumor lines (SW800, J82, T24, 5637 and Scaber). EGF-R expression was found in all cell lines, whereas elevated epithelial cell adhesion molecule expression was seen in 3 (5637, Scaber and TCCsup), alpha(v)beta3-integrin was found in 1 (Scaber) and alpha(v)beta5-integrin was found in 3 (TCCsup, 253J and T24). EGF-R targeting using 425-s11 improved transgene expression in all cell lines from 2.1 to 12.5 times over nontargeted viruses. Epithelial cell adhesion molecule and integrin targeting was inferior to EGF-R targeting with a maximal increase in transgene expression of 2 times for epithelial cell adhesion molecule in 5637cells and 1.6 times for integrin targeting in T24 cells. Comparison of the wild-type replication competent virus with conditionally replicating adenoviruses (Ad5-d55K and Ad5-d24) showed superior oncolytic activity for the latter 2 in all lines. Furthermore, improved cytotoxicity (29% to 33%) was obtained in 4 of the 7 lines after pre-incubation of Ad5-d24 with 425-s11. CONCLUSIONS: EGF-R directed bispecific single chain antibodies enhance adenovirus mediated transgene expression and oncolysis in bladder cancer lines.     

Antiproliferative effects of interferons against human bladder carcinoma cell lines in vitro

In order to evaluate the antiproliferative effects of recombinant human interferon-gamma 2c (rHu IFN-gamma 2c), recombinant human interferon-gamma (rHu IFN-gamma), natural interferon-beta (IFN-beta), and their combination with cytotoxic agents, 17 different human bladder carcinoma cell lines were tested in vitro. The antiproliferative effects were compared in evaluating the tumor cell inhibiting potency of the different interferon (IFN) classes. It could be demonstrated that interferons have inhibiting effects on the bladder cancer cell multiplication rate, yet there are significant differences in the susceptibility of different IFN preparations on different cell lines. The cell lines BT1, RT4, EJ, 468P, 253J, SD, TCCSUP, and SW1738 can be defined as sensitive, T24, 647V, VM-CUB2, and J82 as semisensitive, HT1376, 5637, VM-CUB1, 639V and SW1710 as resistant upon treatment with IFN. The combination of rHu IFN-alpha 2c, IFN-beta, and rHu IFN-gamma seems to be more effective than treatment with rHu IFN-alpha 2c alone. The cytotoxic effect of doxorubicin on bladder cancer cells can be intensified by combining it with IFN.     

Adenoviral p53 gene transfer in human bladder cancer cell lines: cytotoxicity and synergy with cisplatin

Mutations of the tumor suppressor gene p53 are common in bladder cancer. To determine whether p53 gene transfer would lead to decreased viability of bladder cancer cells, we studied the effect of p53 gene transfer in human bladder cancer cell lines with either mutant or wild-type p53. Bladder cancer cell lines 5637 and J82 (which express only mutant p53) and 253J-BV (which expresses wild-type p53) were transduced with vectors containing the β-galactosidase gene (Ad5-lacZ), wild-type human p53 gene (Ad5CMV-p53), or no foreign gene (DL312 or Ad5-polyA). X-gal staining of cells exposed to Ad5-lacZ showed that the adenoviral vector was capable of transducing each of the cell lines. Increases in p53, p21^waf1/cip1 and bax protein were demonstrated following exposure to Ad5CMV-p53, and there was a dose-dependent increase in the number of apoptotic cells. Cell viability was decreased in all three cell lines, although J82 was less sensitive than either 5637 or 253J-BV. To determine whether cisplatin increases sensitivity of J82 cells to Ad5CMV-p53, we performed median effect analysis for cisplatin combined with Ad5CMV-p53 or DL312. The combination index for cisplatin plus Ad5CMV-p53 revealed synergy, whereas cisplatin and DL312 were only additive. These results suggest that forced p53 gene expression is cytotoxic to human bladder cancer cells with either p53 mutant or wild-type background, and that combination with cisplatin is a potential method for overcoming resistance.     

E-cadherin和CAR在人膀胱癌细胞中的表达及其意义

目的检测上皮型钙黏素（E—cadherin）和柯萨奇-腺病毒受体（coxsackie and adenovirus receptor，CAR）在多种人膀胱癌细胞中的表达情况，初步讨论E-cadherin与CAR在人膀胱癌细胞中表达的意义及两者间的关联。方法用Western印迹法测定人膀胱癌细胞中E—cadherin和CAR的表达情况。结果E—cadherin，CAR在RT4、5637细胞中表达较高，在253J细胞中表达较低；E—cadherin在J82、T24细胞中不表达，CAR在J82细胞中微弱表达，在T24中不表达。结论E-cadherin和CAR在人膀胱癌细胞中的表达趋势一致，两者可能相互协作，共同参与膀胱癌的侵袭转移过程。     

Characterization of insulin-like growth factor I binding sites in human bladder cancer cell lines

Summary The role of insulin-like growth factor I (IGF-I) in the growth and development of bladder cancer cells was investigated using cultured human cell lines representing differentiated (RT-4, 5637) or undifferentiated (T-24, J-82, TCC-SUP) transitional cell carcinoma (TCC). In the presence of 2% serum, IGF-I significantly stimulated the growth of all cell lines. The proliferation of T-24, 5637, and RT-4 cells was more sensitive to IGF-I than that of J-82 and TCC-SUP cells. [¹²⁵I]IGF-I binding to 5637 and J-82 cells was significantly higher than that to T-24 and TCC-SUP cells (P<0.001). RT-4 cells possessed the lowest binding capacity among the cell lines tested. Scatchard analysis of [¹²⁵I]IGF-I binding to four of the five cell lines indicated a single binding site for IGF-I, with apparent dissociation constants (K _d) of 1.27, 1.18, 1.34, and 1.39 nmol/l for TCC-SUP, J-82, 5637, and T-24, respectively. Therefore, the difference observed in [¹²⁵I]IGF-I binding among the bladder cancer cell lines was attributed to the difference of IGF-I binding sites and not to a change in receptor binding affinity. Cross-linking studies supported the suggestion that [¹²⁵I]IGF-I was bound to a receptor on these cells. The results indicate that cultured human bladder cancer cells contain functional IGF-I receptors. A differentiated cell line, RT-4, possesses significantly fewer IGF-I receptors than other cell lines. This suggests that the overexpression of IGF-I receptor may reflect the malignant potential of bladder cancer cells.