Low expression of S100P associated with paclitaxel resistance in ovarian cancer cell line

Background Recent studies indicate that S100P expression may be a biomarker that can predict the success of cancer chemotherapy. Whether it is relevant to chemotherapeutics in ovarian cancer is unknown. In this study, we investigated the association of S100P expression with paclitaxel sensitivity in ovarian cancer cell lines. Methods We measured S100P expression and paclitaxel resistance profiles in parent SKOV3 and OVCAR3 cell lines. Then, the two cell lines were transiently transfected with S100P siRNA. We also constructed an OVCAR3 cell clone that stably overexpressed S100P. The effect of S100P expression level on the survival of cells exposed to paclitaxel was measured using the MTT assay. S100P expression was evaluated by semi-quantitative RT-PCR and Western blotting. Significance of differences was calculated using independent samples t-test and one way analysis of variance （ANOVA）. Results Lower S100P expression was associated with a survival advantage in OVCAR3 cells exposed to paclitaxel; the survival advantage in SKOV3 cells was smaller （P 〈0.05）. The survival advantage associated with decreased S100P expression was even greater for SKOV3 and OVCAR3 cells that had been transfected with S100P siRNA before being exposed to paclitaxel （P 〈0.05）. Consistent with this, the OVCAR3 cell clone that was transfected to overexpress S100P was more sensitive to paclitaxel （P 〈0.05）. Conclusions Low S100P expression contributes to drug resistance to paclitaxel in ovarian cancer cell lines. S100P expression thus might be a marker that can predict the effectiveness of paclitaxel based chemotherapy. Such a marker could be helpful in improving individual medication regimens for ovarian cancer patients.     

RNAi抑制EGFR基因增强卵巢癌细胞对泰素敏感性的研究

目的 探讨表皮生长因子受体(EGFR)基因在卵巢癌细胞对泰素敏感性的增强作用.方法 构建针对EGFR基因序列特异性shRNA的表达载体,用脂质体转染卵巢癌SKOV3细胞及G418筛选阳性克隆.采用RT-PCR、Western blot检测EGFR基因的抑制情况,用MTT法检测卵巢癌细胞对泰素的敏感性.结果 靶向EGFR的序列特异性shRNA可明显抑制EGFR基因的表达,EGFR mRNA和蛋白的抑制率分别为77.5%和76.1%;序列特异性shRNA-EGFR可明显提高卵巢癌细胞对泰素的敏感性,差异有统计学意义(P<0.01).结论 体外实验证实抑制EGFR基因的表达可提高卵巢癌细胞的化疗敏感性.     

MDR1、GST-π、p53、bcl-2在上皮性卵巢癌的表达及意义

目的 探讨ＭＤＲ１、ＧＳＴ－π、ｐ５３、ｂｃｌ－２与上皮性卵巢癌临床病理学特性的关系。方法 采用免疫组化ＳＰ法检测８９例不同性质卵巢组织中ＭＤＲ１、ＧＳＴ－π、ｐ５３、ｂｃｌ－２的表达情况。结果 ①上皮性卵巢癌,交界性肿瘤,良性上皮性肿瘤,正常卵巢组织中四种指标的表达情况：ＭＤＲ１依次为２２／５２（４２．３％）、３／９（３３．３％）、０／２１、０／７、ＧＳＴ－π依次为４３／５２（８２．７％）、５／     

多药耐药基因在肺癌患者外周血中的表达及意义

目的：探讨肺癌患者外周血中多药耐药基因（MDR1）的表达水平及其与临床病理因素、化疗的关系。方法：经病理证实为肺癌的患者40例（病理组），鳞状细胞癌13例，腺癌14例，小细胞未分化癌13例。应用荧光定量PCR（FQ-PCR）技术，动态监测化疗前后MDR1 mRNA的表达，并与30例健康者（对照组）的检测结果进行比较分析。结果：病理组化疗前MDR1mRNA的检出率明显高于健康对照组，差异具有统计学意义（P〈0．05）；各种类型的肺癌患者随着化疗次数的增多MDR1mRNA的表达增强；化疗前后肺鳞状细胞癌和肺腺癌MDR1mRNA的表达明显高于小细胞肺癌，差异具有统计学意义（P〈0．05）。结论：化疗可诱导各种病理类型肺癌MDR1mRNA表达增加；肺腺癌和肺鳞癌可能为原发性MDR，小细胞肺癌可能为获得性MDR；肺癌患者MDR1mRNA表达程度可作为指导化疗用药及预测预后的指标。     

癌超甲基化基因1蛋白和卵巢癌基因1蛋白在卵巢癌组织中的表达及意义研究

目的 研究卵巢癌组织中癌超甲基化基因1蛋白和卵巢癌基因1蛋白的表达情况及其与卵巢癌病理特点的关系,探讨其在卵巢癌中的意义.方法 选择2014-2015年在该院妇产科手术切除卵巢癌组织标本63例和正常卵巢组织标本63例作为研究对象.采用Western blot法测定卵巢癌组织和正常卵巢组织中癌超甲基化基因1蛋白和卵巢癌基因l蛋白的表达情况,并分析其与卵巢癌病理特点的关系.结果 卵巢癌组织中癌超甲基化基因1蛋白、卵巢癌基因1蛋白的表达量明显低于正常卵巢组织(P＜0.05).癌超甲基化基因1蛋白在不同卵巢癌分期、不同分化程度和不同病理类型中的表达量比较差异均无统计学意义(P＞0.05).在卵巢癌Ⅰ期中卵巢癌基因1蛋白的表达高于卵巢癌Ⅱ期和Ⅲ～Ⅳ期(P＜0.05),Ⅱ期的表达量高于Ⅲ～Ⅳ期(P＜0.05);高分化的表达量高于中分化和低分化(P＜0.05),中分化和低分化的表达量比较差异无统计学意义(P＞0.05);卵巢癌基因1蛋白在卵巢癌不同病理类型中的表达比较差异无统计学意义(P＞0.05).结论 癌超甲基化基因1蛋白失活可能只参与卵巢癌的发生,卵巢癌基因1蛋白和卵巢癌的发展有一定关系.     

膀胱癌多重耐药基因表达的研究

目的:从基因水平对膀胱癌多重耐药基因(MDR1)进行研究.方法:用PCR技术对膀胱癌组织及正常膀胱组织进行分析检测.结果:大多数膀胱癌及少数正常膀胱粘膜标本在167 bp处显示MDR1基因异常扩增.结论:随肿瘤分级的增高,MDR1表达率有增高趋势,MDR1基因表达与膀胱癌生物活性密切相关.     

The effect of methylseleninic acid on paclitaxel efficacy in A2780 ovarian cancer cells

Objective:The role of methylseleninic acid (MSeA), a selenium compound, has been documented in cancer chemoprevention. However, the therapeutic effect of MSeA in combination with paclitaxel, a chemotherapeutic agent used to treat ovarian cancer, is unknown. In this study, we investigated the effect of combination treatment of MSeA and paclitaxel against ovarian cancer cells. Methods:Ovarian cancer cells(A2780) were treated with different concentrations of MSeA, paclitaxel alone or in combination. The individual and combined concentrations of drugs that achieved certain cells growth/death were determined using a sulforhodamine B(SRB) assay. Drug effects on cell viability were further confirmed using floating cell count and trypan blue exclusion assay. The mean values±standard deviation were calculated and compared between treatment groups using unpaired t test. Results: The concentration of paclitaxel alone that inhibited 50% of cell growth(IC50) was 0.5μmol/L. This concentration increased to 1.2μmol/L when paclitaxel was given in sequential combination with MSeA. The number of dead cells after the combination treatment did not show a significance increase when compared with drug alone. Conclusion:Pretreatment with MSeA did not enhance the paclitaxel effect against A2780 ovarian cancer cells.     

卵巢癌干细胞对5种化疗药物的耐药性及其机制

目的探讨卵巢癌干细胞（Ovarian Cancer Stem cells,OCSCs）针对化疗药物耐药的作用机制。方法通过免疫磁选方法分离和纯化OCSCs,对比普通卵巢癌细胞（EOC）,观察在紫杉醇、卡铂、顺铂、5-FU、阿霉素5种化疗药物作用下OCSCs耐药的情况。通过定量PCR,分析EOC与OCSCs中ABCG2、ABCB1、Nanog、MMP-2和MMP-9基因的表达水平。结果从HO8910细胞分离的CD44＋CD117＋细胞,对卡铂、顺铂、紫杉醇、阿霉素和5-FU等化疗药物的耐药性明显强于HO8910细胞（P〈0.05）。定量PCR检测发现CD44＋CD117＋细胞中ABCG2、ABCB1、Nanog、MMP-2和MMP-9基因的表达显著高于HO8910细胞（P〈0.05）。结论与EOC相比,OCSCs对多种化疗药物的耐药性更为明显的机制可能与其较高水平表达ABCG2,ABCB1,Nanog,MMP-2和MMP-9基因有关。     

稳定过表达XAF1基因对A2780卵巢癌细胞生物学功能的影响

目的 构建稳定过表达XAF1基因A2780卵巢癌细胞株,并观察XAF1基因对卵巢癌细胞增殖、凋亡、细胞周期及对紫杉醇敏感性的影响。方法 分别将质粒pcDNA3.1（+）和pcDNA3.1（+）-XAF1转染至卵巢癌细胞A2780,通过质粒抗性标记（遗传霉素G418）筛选得到阴性对照细胞株（A2780/Negative control, A2780/NC）和稳定表达XAF1的细胞株（A2780/XAF1）;通过行细胞克隆形成实验和CCK8实验检测细胞增殖及对紫杉醇的敏感性,流式细胞仪检测细胞周期及细胞凋亡。结果 成功构建了稳定表达XAF1的卵巢癌细胞A2780/XAF1,细胞形态无明显变化;与A2780/NC相比,A2780/XAF1克隆形成能力能力更低（P= 0.0016）,细胞贴壁后第1天和第3天增殖活性更低（P=0.009,0.0035）,两组细胞的细胞周期分布差异存在统计学意义（P< 0.0001）,两两比较结果显示A2780/XAF1组G2-M期细胞百分比显著增加（P<0.001）。在无凋亡刺激、无血清培养及紫杉醇诱导下,A2780/XAF1的凋亡率均比A2780/NC更高（P<0.001）;在不同紫杉醇浓度作用下,A2780/XAF1的增殖活性均显著低于A2780/NC（P<0.001）,且A2780/XAF1的紫杉醇半数抑制浓度显著低于A2780/NC。结论 成功构建稳定表达XAF1的卵巢癌细胞A2780/XAF1;XAF1调控卵巢癌细胞A2780的增殖、凋亡及细胞周期,并增加了卵巢癌对紫杉醇的敏感性。     

红景天苷下调KRT17增加紫杉醇对卵巢癌细胞的化疗敏感性

[目的] 红景天苷是从景天科植物大株红景天的干燥根及根茎或干燥全草中提取的一种化合物,具有多种药理作用。研究旨在探讨红景天苷下调角蛋白家族成员17（KRT17）影响紫杉醇对卵巢癌细胞的化疗敏感性。[方法] 红景天苷、紫杉醇单独或联用处理SKOV-3细胞,将细胞随机分为4组：对照组、红景天苷单独处理组、紫杉醇单独处理组和联合处理组,Cell Counting Kit-8（CCK-8）法检测细胞毒性,5-乙炔基-2’-脱氧尿苷（EDU）检测细胞增殖,Hoechst 33258检测细胞凋亡。免疫荧光法检测自噬体形成情况,蛋白免疫印迹法检测KRT17和细胞自噬相关蛋白表达水平。[结果] 与对照组比较,红景天苷、紫杉醇单独处理组随浓度的升高,对SKOV-3细胞的毒性增强,细胞增殖数、P62蛋白表达降低,细胞凋亡率、LC3荧光斑点数、LC3-Ⅱ/LC3-I比值、Beclin1蛋白表达升高。且红景天苷与紫杉醇协同处理效果优于红景天苷、紫杉醇单独处理组,可能是红景天苷通过下调KRT17蛋白表达实现的。[结论] 红景天苷下调KRT17增加紫杉醇对卵巢癌细胞的化疗敏感性。     

沉默ERCC1基因对卵巢癌细胞A2780顺铂耐药性的影响

目的：研究RNA干扰切除修复交叉互补基因1（ERCC1）的表达后,卵巢癌细胞A2780对顺铂耐药性的变化。方法：A2780细胞分别转染ERCC1基因的siRNA和GFPsiRNA,并给予顺铂（使其终浓度达到3μmol／L）,蛋白质印迹法分别检测顺铂给药前后ERCC1蛋白的表达,并用MTT法检测顺铂不同浓度下A2780细胞的存活率。结果：①转染ERCC1 siRNA后,实验组蛋白质表达量较对照组显著降低;@ERCC1 siRNA＋顺铂组的ERCC1蛋白表达要弱于ERCC1 siRNA＋PBS组,而GFPsiRNA＋顺铂组的蛋白表达要弱于GFPsiRNA＋PBS组;③顺铂（浓度在0．75—12μmol／L之间）呈浓度依赖性地降低A2780细胞的存活率;④在相同浓度顺铂的作用下,与GFPsiRNA组相比,ERCC1 siRNA组的顺铂量效曲线左移。结论：顺铂能抑制沉默ERCC1基因后A2780细胞的生长,且在一定浓度范围内呈浓度依赖性;ERCC1是参与顺铂耐药性产生的重要因素之一。     

卵巢癌紫杉醇耐药的蛋白质组学研究

目的：研究与卵巢癌紫杉醇耐药相关的蛋白质。方法：应用双向凝胶电泳（2-DE）和基质辅助激光解吸电离飞行时间质谱（MALDI-TOF-MS）寻找紫杉醇耐药细胞和敏感细胞的差异表达蛋白质。使用Western印迹技术对其中2个蛋白质进行验证。结果：通过对2组细胞总蛋白质双向凝胶电脉图谱进行分析,找到差异蛋白质点40个;通过质谱分析,24个蛋白质得到鉴定。这些蛋白质包括增殖细胞核抗原（PCNA）、nm23蛋白、prohibitin（PHB）分子伴侣蛋白、脂皮质素（annexin）、α-烯醇化酶（α-enolase）以及热休克蛋白（HSP）等。结论：通过蛋白质组学技术,发现了卵巢癌紫杉醇耐药细胞系和敏感细胞系之间差异表达蛋白质24个,这些差异蛋白质可能参与卵巢癌细胞紫杉醇耐药过程。     

Effect of siRNA targeting MTA1 on metastasis malignant phenotype of ovarian cancer A2780 cells

Ovarian cancer is the fifth lethal gynecologic malignancy. Metastasis-associated gene 1 (MTA1) is overexpressed in many malignant tumors with high metastatic potential. This study investigated whether down-regulation of MTA1 expression by RNAi in A2780 ovarian cancer cells could affect proliferation, anoikis, migration, invasion and adhesion of the cells and to research the potential for MTA1 gene therapy of ovarian cancer. After transfection with effective Mta1 gene siRNA, the effects on proliferation, anoikis, migration, invasion and adhesion of A2780 cells were tested by MTT assay, flow cytometry, wound-healing assay, Transwell assay and adhesion assay. Expression levels of PTEN, beta 1 integrin, MMP-9, phosphor-AKT (Ser473), and total AKT activity were evaluated in control and transfected cells. The results showed that inhibition of MTA1 mediated by Mta1-siRNA transfection decreased the cell invasion, migration and adhesion, and induced the increased cell anoikis, but no significant difference was found in proliferation of A2780 cancer cells. In addition, beta 1 integrin, MMP-9, and phosphor-AKT protein levels were significantly down-regulated, while PTEN was significantly up-regulated. These results demonstrated that MTA1 played an important role in the cell metastasis in ovarian cancer. MTA1 could serve as another novel potential therapeutic target in ovarian cancer.     

姜黄素逆转卵巢癌对紫杉醇耐药的实验研究

目的:通过观察姜黄素作用人卵巢癌A2780/Taxol细胞株后,逆转该细胞株对紫杉醇的耐药作用,研究卵巢癌细胞对紫杉醇耐药的原因及姜黄素逆转耐药机制。方法:人卵巢癌A2780/Taxol细胞株在体外培养,将细胞分为对照组（A组）和实验组（不同浓度姜黄素组作用细胞）。用四甲基偶氮唑盐微量酶反应比色法检测2组细胞与相同浓度紫杉醇联用后细胞的生长抑制情况;Westernblot方法检测2组细胞内P-糖蛋白（P-gp）和蛋白激酶C-α（PKC-α）的表达情况。结果:四甲基偶氮唑盐微量酶反应比色法得出联合用姜黄素各组细胞生长抑制率均高于A组（P<0.05～P<0.01）;Western blot检测联合用姜黄素各组多药耐药蛋白-1/P-gp和PKC-α表达均较A组显著降低（P<0.01）。结论:姜黄素通过阻碍卵巢细胞中多药耐药蛋白-1/P-gp和PKC-α的表达,增加紫杉醇对细胞的毒性,降低细胞的耐药性。     

肺癌MDR1基因表达与临床病理特征的关系

目的 探讨ＭＤＲ１基因表达与肺癌病理特征的关系。方法 应用逆转录－多聚酶链反应（ＲＴ－ＰＣＲ）技术对原发性肺癌,癌旁组织及淋巴结中ＭＤＲ１基因的表达进行检测分析。结果 肺癌组织及癌旁组织中ＭＤＲ１阳性率分别为５４％和１０％,两者比较差异显著（Ｐ〈０．００１）;转移淋巴结组织ＭＤＲ１阳性率为５３％,而非转移淋巴结组织未见ＭＤＲ１阳性表达;各病理类型中不同分化程度肿瘤的ＭＤＲ１阳性分布不同,高分化腺癌     

miR-125b confers resistance of ovarian cancer cells to cisplatin by targeting pro-apoptotic Bcl-2 antagonist killer 1

Chemotherapy is the preferred therapeutic approach for advanced ovarian cancer,but a successful long-term treatment is prevented by the development of drug resistance.Recent works have underlined the involvement of non-coding RNAs,microRNAs(miRNAs) in cancer development,with several conjectures regarding their possible involvement in the evolution of drug resistance.This study is to investigate the promoting effects and mechanism of miR-125b involved in the development of chemoresistance in ovarian cancer.The different expression of miR-125b in cisplatin-sensitive ovarian cancer cell line(OV2008) and its resistant variant(C13*) was identified by real-time PCR.An in vitro cytotoxicity assay and apoptosis assay using CCK-8 assay and flow cytometry,were carried out to detect the effect of miR-125b and Bak1 on cisplatin resistance of cells.Real-time PCR,Western blotting and luciferase reporter assay were used to detect whether Bak1 is a target of miR-125b.As compared with OV2008 cells,the expression levels of miR-125b in C13* cells were increased.It was found that the up-regulation of microRNA-125b caused a marked inhibition of cisplatin-induced cytotoxicity and apoptosis and a subsequent increase in the resistance to cisplatin in OV2008 and C13* cells.Moreover,Bak1 was a direct target of miR-125b,and down-regulation of Bak1 suppressed cisplatin-induced apoptosis and led to an increased resistance to cisplatin.Our study indicates that miR-125b has a significantly promoting effect on chemoresistance of C13* cells and up-regulation of miR-125b expression contributes to cisplatin resistance through suppression of Bak1 expression.This finding has important implications in the development of targeted therapeutics for overcoming cisplatin resistance in ovarian cancer.     

原发性食管癌组织中多药抗药性基因1的表达

用ＲＴＰＣＲ方法，定量检测了３０例食管癌和相应切断正常粘膜组织中多药抗药（ＭｕｌｔｉＤｒｕｇＲｅｓｉｓｔａｎｃｅ，ＭＤＲ）性基因１的表达。结果：癌组织中３３．３％的病例存在ＭＤＲ１基因的表达，而相对应的切断正常粘膜组织中，仅有１３．３％的病例存在ＭＤＲ１基因的表达，皆为低中度表达。Ｐ＜０．０５，２者间差异有显著性。但ＭＤＲ１基因的表达与食管癌临床病理资料如性别、年龄、肿瘤大小、分级、淋巴结转移、ＴＮＭ分期等无关。结果提示：ＭＤＲ１基因的表达在食管癌的发生中起一定的作用，它可能与食管癌的原发性耐药有关。     

急性白血病多药耐药基因表达及临床意义

目的研究多药耐药基因(MDR1)在急性白血病(AL)中的表达及与预后的关系.方法采用链亲和素-胶体金原位杂交(ISH-SAG)方法对59例不同病期的AL患者进行MDR1检测.结果(1)ANLLMDR1阳性表达率(50.0%)虽高于ALL阳性表达率(37.5%),但差异无显著意义(P＞0.05).(2)MDR1在复发难治组的阳性表达率明显高于缓解组(P＜0.05).(3)MDR1阳性表达与临床缓解密切相关,MDR1阳性表达者的完全缓解(CR)率(22.2%)明显低于MDR1阴性者的CR率(80.0%)(P＜0.05).(4)MDR1阳性表达作为耐药标准的评价,其敏感率、特异率、准确率分别为77.8%、80.0%、79.0%.结论MDR1阳性表达与临床耐药相关,是影响AL患者预后的一个重要的因素.且其敏感性、特异性均较高.     

Effect of Mad2 on paclitaxel-induced cell death in ovarian cancer cells

In this article, the status of spindle assembly checkpoint and the alteration of its major component, Mad2 protein level were examined in A2780 and SKOV3 ovarian cancer cell lines.Recombinant eukaryotic expression plasmid pEGFP-Mad2 was transfected into paclitaxel-resistant SKOV3 cells and Mad2 protein was knocked down by Mad2-specific siRNA in paclitaxel-sensitive A2780 cells.Then the expression level of Mad2 gene was detected by Western blotting.Flow cytometry revealed that SKOV3 cells were not fully arrested in G2/M phase in contrast to A2780 cells in the presence of paclitaxel.However, paclitaxel sensitivity assay showed that sensitivity to paclitaxel was reversed after the transfection in both cell lines in terms of number of cells arrested at G2/M phase and the expression of Bcl-2 was significantly changed.These results suggest that weakened spindle checkpoint with reduced expression of Mad2 is associated with resistance to paclitaxel in ovarian cells and Bcl-2 may be involved in this process.