c-Met基因调控肺腺癌A549细胞放射敏感性

目的探讨上调和下调肺腺癌细胞株A549细胞中c-Met基因表达水平后,该细胞鼠移植瘤放射敏感性的变化情况。方法利用电穿孔法将c-Met siRNA和重组表达载体pc DNA3.1-c-Met分别转染入肺癌A549细胞后采用G418筛选得到稳定转染的肺癌细胞系。转染48 h后用RT-PCR法和Western blot法分别检测细胞中c-Met基因和蛋白表达水平,采用CCK-8法检测细胞增殖活性;克隆形成实验研究分别上调和下调c-Met基因表达水平对肺腺癌细胞株A549放射敏感性的影响;TUNEL法检测细胞凋亡影响,移植瘤实验检测基因沉默和激进c-Met基因表达水平并联合放射射线照射对肺腺癌细胞生长的抑制作用。结果 c-Met下调组中肺癌A549细胞内c-Met基因和蛋白表达水平明显降低,而上调组中的表达水平则得到了明显升高。c-Met下调组肺癌A549细胞放射敏感性升高,c-Met上调组肺癌A549细胞放射敏感性降低(P0.05)。下调组中肺癌A549细胞的增殖活性受到抑制而细胞凋亡率显著增加(P0.05),上调组肺癌细胞的增殖能力明显增强而细胞凋亡率明显降低(P0.05);下调组裸鼠移植瘤的平均体积明显小于对照组,而上调组裸鼠移植瘤的瘤体平均体积则显著大于对照组(P0.05)。结论基因沉默c-Met的基因表达水平能显著降低肺癌细胞的增殖活性,抑制人肺癌A549细胞裸鼠移植瘤的生长并明显提高移植瘤瘤体的放射敏感性。     

慢病毒靶向携带survivin-siRNA抗肺腺癌裸鼠体内研究

目的探讨慢病毒载体介导survivin-siRNA对人肺腺癌裸鼠移植瘤的体内抑瘤活性。方法参考siRNA的设计策略,构建表达survivin-siRNA的慢病毒载体;于各BALB/C裸鼠右侧腋窝皮下接种人肺腺癌A549细胞悬液,构建人肺腺癌A549细胞裸鼠移植瘤模型,肿瘤组织局部注射survivin-siRNA的慢病毒载体,观察肿瘤的体积及随时间变化的生长曲线;通过碘化丙啶(propidiumiodide,PI)染色检测细胞凋亡情况;流式细胞术检测肿瘤细胞周期变化。结果慢病毒载体介导survivin-siRNA对裸鼠人肺腺癌A549的抑瘤率为46.07%;经过PI和Annexin-V染色区分凋亡早晚期的细胞为30%~35%,荧光显微镜下观察肿瘤细胞凋亡;G1期细胞比例明显增加,S期细胞比例则明显减少。结论慢病毒载体介导的siRNA能有效抑制裸鼠移植人肺腺癌A549的survivin基因的表达,有效激发细胞凋亡。     

KLF15在人肺腺癌中表达的临床意义

目的:Krüppel样因子15(Krüppel-like factor 15,KLF15)参与肿瘤的增殖、侵袭和转移,但在肺腺癌中的表达和作用尚不明确。本研究探索KLF15蛋白在肺腺癌患者中的表达及其临床意义。方法:收集我院4例肺腺癌组织及匹配的癌旁组织,Western blot分析这些组织中KLF15蛋白表达的差异。同时收集我院72例肺腺癌患者的肿瘤组织标本及临床资料,免疫组织化学染色分析患者肺癌标本中KLF15蛋白的表达,分析其表达与患者临床特征包括预后的关系。另外,采用质粒转染的方法上调肺腺癌A549细胞中KLF15的表达,CCK-8法分析KLF15蛋白对肺腺癌细胞增殖能力的影响。结果:在4例肺腺癌及匹配的癌旁组织中,肺腺癌组织中KLF15蛋白表明显低于癌旁组织。在72例肺腺癌病理标本中,KLF15蛋白低表达或不表达者53例,占73.6%,KLF15高表达者19例,占26.4%。KLF15蛋白高表达的患者,其5年生存率明显优于KLF15低表达的患者(P0.01);KLF15蛋白表达与肺腺癌患者的病理分期(P0.01)及T分期明显相关(P0.01),KLF15蛋白低表达是肺腺癌患者不良预后的重要危险因素。上调肺腺癌细胞中KLF15蛋白的表达可明显抑制肺腺癌细胞的生长。结论:KLF15抑制肺腺癌细胞的生长,有望成为肺腺癌患者的治疗靶点和预后分子标志物。     

RNAi沉默livin基因对裸鼠移植瘤生长及Ki67蛋白表达的影响

目的利用慢病毒携带的livin基因短发夹RNA(shRNA)干扰裸鼠移植瘤中Livin蛋白表达,探讨其对肺腺癌裸鼠移植瘤生长及Ki67蛋白表达的影响。方法建立肺腺癌裸鼠皮下移植瘤模型,待移植瘤长至100mm3左右时,以携带livin基因shRNA慢病毒载体注入移植瘤,观察肿瘤生长情况。用免疫组织化学方法检测各组Livin蛋白、Ki67蛋白表达,分析二者相关性。结果 livin基因shRNA干预组与空白对照组和阴性载体对照组相比,瘤体生长减缓,移植瘤质量明显减小(P<0.01),Livin蛋白、Ki67蛋白的表达明显降低(P<0.01,P<0.01),且Livin蛋白与Ki67蛋白的表达呈正相关(r=0.54,P<0.01)。结论利用livin基因shRNA可抑制移植瘤生长,Livin蛋白表达明显降低,Ki67蛋白的表达也降低,两者呈显著正相关。     

下调CDH17基因对那可丁耐药性人胃癌细胞裸鼠移植瘤模型的影响

研究下调CDH17基因对那可丁耐药的人胃癌MGC-803细胞裸鼠移植瘤模型的影响,为临床上寻求治疗胃癌新方案提供理论依据。以人胃癌MGC-803细胞作为研究材料,建立该细胞的裸鼠移植瘤模型。同时,用HE染色法观察瘤体组织病理学形态。结果显示,RT-PCR和Western blotting实验中siCDH17慢病毒对胃癌MGC-803细胞中CDH17的转录水平和蛋白质表达水平均具有干扰效果(P<0.05)。随后将siCDH17慢病毒干扰的人胃癌MGC-803细胞以及对照细胞进行裸鼠皮下移植瘤实验。移植后第6天各组均见皮下肿瘤结块,采用那可丁药物处理并实时检测肿瘤生长情况。结果发现,siCDH17组肿瘤体积和质量明显小于对照组和siNC组(P<0.05)。且HE染色也发现与对照组比较,siCDH17组的瘤体肿瘤细胞生长受到抑制。因此,下调CDH17基因可以增加胃癌MGC-803细胞对那可丁的敏感性,抑制胃癌MGC-803细胞的生长,最终阻滞裸鼠移植瘤的生长。     

基于癌症基因组图谱筛查卵巢浆液性囊腺癌相关基因

目的:利用全基因组表达谱芯片筛查与卵巢浆液性囊腺癌发生相关的基因,对在卵巢浆液性囊腺癌发生过程中可能参与的基因间的信号转导通路进行分析。方法:选取癌症基因组图谱(TCGA)数据库中卵巢浆液性囊腺癌的Affymetrix Gene Chip Human Exon 1.0 ST Array数据共16张,分别为卵巢浆液性囊腺癌组8张和正常组8张,筛选出差异表达基因,并进行基因本体(gene ontology,GO)分析和信号通路分析,构建卵巢浆液性囊腺癌相关基因间的信号转导通路,分析网络中具有重要作用的基因。结果:共筛选出1 144个在卵巢癌中差异表达的基因,其中表达上调的基因有747个,表达下调的基因有397个。GO分析得到上调差异基因的显著性功能分析结果362项,下调差异基因的显著性功能分析结果 160项(P0.05)。其中包括与肿瘤发生相关的基因功能有细胞周期、DNA复制、细胞增殖、细胞凋亡、细胞黏附等。信号通路分析得到45个显著上调信号通路和14个显著下调信号通路(P0.05)。其中参与肿瘤发生相关的信号通路主要有细胞周期、P53信号通路、DNA复制、肿瘤中的信号通路、PI3K-Akt信号通路、ECM-receptor信号通路、细胞黏附因子、细胞凋亡等。挑选显著性基因功能和信号通路分析的交集基因229个,构建显著性GO与信号通路基因间信号转导网络。分析发现CDK1、PLK1、MCM3和PGK1这4个基因在卵巢癌的基因调控网络中具有重要作用。结论:卵巢浆液性囊腺癌中有大量差异表达基因,差异表达的基因在多个与肿瘤发生密切相关的信号通路中发挥重要的调控作用。     

补体C1s对食管鳞状细胞癌生物学行为的影响

目的：探究补体分子C1s对食管鳞状细胞癌（ESCC）细胞增殖、迁移、黏附以及裸鼠移植瘤生长的影响。方法：利用NCBI-GEO数据库分析ESCC组织和癌旁正常组织（ANTs）中C1S mRNA的表达;采用RT-qPCR和Western blot检测ESCC细胞系中C1s的表达;利用C1s小干扰RNA(siRNA)、C1s短发夹RNA(shRNA)或C1s过表达慢病毒对ESCC细胞进行C1s的敲低或过表达,CCK-8法检测细胞增殖,细胞划痕实验检测细胞迁移,细胞-基质黏附实验检测细胞黏附能力;Western blot检测基质金属蛋白酶MMP1和MMP13表达;裸鼠皮下成瘤实验检测C1s对裸鼠移植瘤生长的影响,免疫组织化学法检测移植瘤中CD34表达,分析肿瘤微血管的形成。结果：ESCC组织中C1S mRNA表达明显高于ANTs,敲低C1s可明显抑制ESCC细胞的增殖、迁移、细胞-基质黏附以及裸鼠移植瘤的生长,而过表达C1S则具有相反的效果;C1s敲低的ESCC细胞TE-1中MMP1和MMP13的表达降低;与对照组相比,C1s过表达组移植瘤中的微血管更加丰富。结论：C1s在ESCC组织中显著上...     

结肠癌裸鼠移植瘤中Raf-1的表达与肿瘤血管生成的相关性

目的:研究Raf-1在结肠癌裸鼠移植瘤中的表达与肿瘤血管生成的关系.方法:通过Western blot方法检测不同结肠癌细胞系(HT.29、SW480、IS174T)中Raf-1的表达,然后将表达差异较大的2株细胞(HT-29、LS174T)分别接种到BALB/C nu/nu小鼠体内,分别观察肿瘤的生长速度、瘤重变化等情况,最后通过免疫组化的方法分别检测瘤组织中Raf-1的表达及肿瘤微血管密度(MVD)的情况,分析二者的相关性.结果:在裸鼠移植瘤模型中,LS174T组移植瘤生长速度及瘤重大于HT-29组;免疫组化结果显示Raf-1在LS174T组中的强阳性率为50%,在HT-29组中为10%,两组之间的差异有统计学意义(P<0.01);在LS174T组中MVD平均值为28.32±5.2,HT-29组MVD平均值为19.23±4.7,两组之间MVD值差异有统计学意义(P<0.01).结论:Raf-1是调控肿瘤组织血管生成的关键分子,在结肠癌裸鼠移植瘤中Raf-1的表达与MVD值成正相关.     

siRNA对VEGF蛋白表达的影响及对裸鼠移植肾癌的抑制作用

目的探讨siRNA沉默血管内皮生长因子（VEGF）基因对人肾癌裸鼠移植瘤VEGF蛋白的表达水平及生长抑制作用的影响。方法化学合成针对VEGF的siRNA序列,通过脂质体将VEGF-siRNA转染到ACHN细胞中,将转染VEGF-siRNA的ACHN细胞（A组）、转染空质粒的ACHN细胞（B组）及未转染的ACHN细胞（C组）分别接种于裸鼠背部皮下。在SPF环境中饲养裸鼠并观察各组裸鼠移植瘤的生长情况,每隔5d测定移植瘤体积大小（肿瘤的长轴L,短轴W,肿瘤体积V=1/2LW2）,绘制肿瘤生长曲线,采用免疫组化及Western blot法测定裸鼠移植瘤组织切片中VEGF蛋白的表达水平。结果 A组小鼠移植瘤成瘤及生长明显缓慢,移植瘤的体积和质量均低于B、C组,差异有统计学意义（P〈0.05）;移植瘤组织切片免疫组化及Western blot法检测结果提示：与B、C组相比,A组中VEGF蛋白表达量降低,差异有统计学意义（P〈0.05）;而B、C组间瘤体的体积重量及VEGF蛋白表达差异均无统计学意义（P〉0.05）。结论 VEGF在肾癌的发生、发展中起着重要作用,化学合成的VEGF-siRNA可特异性抑制肾癌细胞中VEGF的表达,抑制肿瘤的生长增殖。     

肺癌靶向多肽荧光分子探针的研制及其应用

目的:选择能与整合素α3受体结合的小分子多肽cNGQGEQc-L作为靶向载体，将羧基荧光素（FAM）与cNGQGEQc-L连接构建荧光分子探针，通过荧光成像探讨荧光多肽分子探针用于肺腺癌显像的可行性。方法:利用倒置荧光显微镜观察FAM-cNGQGEQc-L与肺腺癌A549细胞结合部位，流式细胞仪检测荧光多肽与A549细胞的竞争抑制实验，观察FAM-cNGQGEQc-L随浓度的增加与肺腺癌A549细胞结合能力的变化情况。通过小动物活体成像仪，观察荧光多肽在荷瘤裸鼠体内的生物分布特点。结果:倒置荧光显微镜显示荧光多肽cNGQGEQc-L能与A549细胞结合，结合部位在细胞膜和细胞质中。流式细胞仪测试结果证明荧光多肽与A549细胞的结合具有特异性和饱和性，当FAM-cNGQGEQc-L浓度为0.125 mmol/L时，荧光多肽与A549细胞的结合趋近饱和。荷瘤裸鼠活体成像显示移植瘤能够摄取荧光多肽，且荧光多肽通过泌尿系统和胆道系统排泄。结论:体外、体内荧光实验结果显示，荧光多肽分子探针FAM-cNGQGEQc-L可与肺腺癌A549细胞、肺癌移植瘤结合，能够特异性靶向肺腺癌。     

在不同转移潜能人肺癌细胞移植瘤中血管性血友病因子的表达

目的探讨血管性血友病因子(vWF)在不同转移潜能人肺癌裸鼠移植瘤中的表达。方法体外培养低转移及高转移人肺癌细胞系A549和D95,Transwell小室法检测肿瘤细胞体外侵袭和迁移能力;10只Balb/c裸小鼠随机分为A549组和D95组(n=5)。0. 2 mL两种肿瘤细胞悬液(浓度约为1×10^7/mL)分别皮下注入A549组及D95组裸小鼠左上肢,构建人肺癌裸鼠移植瘤模型。观察vWF对裸小鼠移植瘤生长的影响;ELISA检测外周血vWF水平;免疫组化检测移植瘤vWF蛋白表达;免疫印记检测移植瘤、肺和肝vWF蛋白表达。结果 D95肺癌细胞体外侵袭和迁移细胞数多于A549肺癌细胞(P<0. 05);D95组裸小鼠于皮下接种后第5天全部出现瘤结节,A549组于第7天全部出现;与A549组相比,D95组裸小鼠移植瘤质量及肺转移瘤结节数显著增多(P<0. 05),D95组移植瘤、肺及肝组织vWF蛋白的表达显著高于A549组(P<0. 01)。结论 vWF与人肺癌细胞的转移潜能密切相关。     

参慈胶囊联合顺铂通过PI3K/AKT/mTOR信号通路逆转人肺腺癌顺铂耐药的机制研究

目的:探讨参慈胶囊联合顺铂是否通过PI3K/AKT/mTOR信号通路逆转接种人肺腺癌A549/DDP细胞的裸鼠体内的顺铂耐药。方法:建立裸鼠人肺腺癌移植瘤模型,随机分为对照组、参慈胶囊组、顺铂组和参慈胶囊+顺铂组。对照组予生理盐水,其余各组荷瘤裸鼠均用药21 d,断颈处死,取肿瘤组织,采用流式细胞术检测细胞周期与细胞凋亡;采用FQ-PCR技术检测A549/DDP肺癌组织PTEN、P-糖蛋白、PI3K、AKT和mTOR的mRNA表达情况。结果:参慈胶囊组、顺铂组和参慈胶囊+顺铂组与对照组比较,对人肺腺癌A549/DDP细胞的增殖均有抑制作用,其中参慈胶囊+顺铂组较其它治疗组能够进一步将人肺腺癌A549/DDP细胞阻滞于G_2/M期,促进细胞凋亡,增加PTEN的表达,抑制P-糖蛋白、PI3K、AKT和mTOR的表达。结论:参慈胶囊可能通过阻断PI3K/AKT/mTOR信号通路,促进PTEN的表达,或者抑制P-糖蛋白介导的耐药途径,增强裸鼠体内人肺腺癌A549/DDP耐药细胞对顺铂的敏感性。     

Low expression of KLF17 is associated with tumor invasion in esophageal carcinoma

Purpose: KLF17 belongs to the Sp/KLF zinc-finger protein family as a regulator in tumor development. However, its expression and biologic function has remained unclear in EC. Methods: The esophageal carcinoma tissue samples and adjacent normal tissues were obtained from the Second Hospital of Hebei Medical University. Immunohistochemistry, Western blot, and transfection were applied to evaluate the expression and clinical significance of KLF17 in esophageal cancer. Results: In this study, we showed that KLF17 was overexpressed in esophageal normal samples compared to the cancer. Moreover, KLF17 was upregulated at lymph node non-metastatic cancer tissues when compared to metastatic cancer tissues. KLF17 overexpression decreased EC cell proliferation, migration and invasion ability. In contrast, the knockdown of KLF17 increased EC cell proliferation, migration and invasion ability. Conclusion: These results suggest that KLF17 inhibits tumor development and may serve as a potential therapeutic target.     

Multidrug resistance-associated protein 3 and Bcl-2 contribute to multidrug resistance by vinorelbine in lung adenocarcinoma

Although cancer cells initially respond to vinorelbine (NVB), the acquisition of resistance to the treatment is the main cause of chemotherapeutic failure in lung cancer. The intrinsic mechanism of drug resistance induced by NVB in lung cancer is not clear and tumor cell models to study NVB resistance have not been widely studied. We previously established a NVB resistant cell line, Anip973/NVB, derived from the Anip973 lung adenocarcinoma cell line. The aim of this study was to investigate the molecular mechanisms involved in the resistance to NVB in lung adenocarcinoma. Genetic profiles of Anip973/NVB and Anip973 cells were compared by microarray analysis and qRT-PCR. Tumor xenografts were obtained by grafting Anip973/NVB and Anip973 cells into nude mice and the xenograft response to NVB or control treatment was evaluated. Morphological assessment of xenograft tissues was performed by transmission electron microscopy (TEM). Immunohistochemistry (IHC) was used to compare Bcl-2 and MRP3 protein expression in xenografts. Fifty-five up-regulated genes and 88 down-regulated genes in Anip973/NVB cells compared with Anip973 cells were identified by cDNA microarray analysis. Up-regulation of MRP3 and Bcl-2 was confirmed by qRT-PCR. NVB inhibits xenografts of Anip973 growth but did not affect xenografts of Anip973/NVB growth. Ultrastructural changes observed by TEM showed that NVB induces apoptosis in the Anip973-treated group but not in the Anip973/NVB-treated group. Higher expression rates of Bcl-2 and MRP3 were observed in Anip973/NVB xenograft cells compared with Anip973 xenograft cells by IHC. In conclusion, in the present study, we identified a set of genes responsible for multidrug resistance in Anip973/NVB cells. Among them, MRP3 and Bcl-2 may participate in lung adenocarcinoma multidrug resistance induced by NVB.     

Silencing KLF16 inhibits oral squamous cell carcinoma cell proliferation by arresting the cell cycle and inducing apoptosis

Krüppel-like factor 16 (KLF16), a member of the Krüppel-like factor (KLF) family, has been extensively investigated in multiple cancer types. However, the role of KLF16 in oral squamous cell carcinoma (OSCC) remains unknown. Thus, we conducted this study to investigate its related mechanism. KLF16 expression in OSCC cell lines was quantified by western blotting. Then, OECM1 and OC3 cells were divided into Blank, siCtrl, siKLF16#1 and siKLF16#2 groups. Subsequently, cell proliferation was detected using 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assays, cell migration and invasion were detected with wound healing and Transwell assays, and cell cycle distribution and cell apoptosis were detected via flow cytometry. KLF16, p21, CDK4, Cyclin D1 and p-Rb expression was detected by western blotting. Finally, xenograft models were established in nude mice to observe the in vivo effects of KLF16 on OSCC. KLF16 protein expression was upregulated in OSCC cells. Compared to the cells in the Blank group, the OECM1 and OC3 cells in the siKLF16#1 group and siKLF16#2 group exhibited a sharp decrease in proliferation but a remarkable increase in apoptosis. Moreover, the proportion of cells in the G0/G1 phase notably increased and that in the S phase decreased, with evident decreases in cell invasion and migration. Moreover, KLF16, cyclin-dependent kinase 4 (CDK4), Cyclin D1 and p-Rb protein expression was upregulated, but p21 expression was downregulated. The mice in the siKLF16#1 and siKLF16#2 xenograft model groups exhibited slower tumour growth and smaller tumours with evident downregulation of Ki67 expression compared to the mice in the Blank group. KLF16 expression was upregulated in OSCC cells, and interfering with KLF16 led to cell cycle arrest, inhibited OSCC cell growth and promoted cell apoptosis.     

树突状细胞诱导的CIK细胞对肺癌生长的抑制作用

目的探讨树突状细胞诱导的CIK细胞对肺癌移植瘤细胞生长的抑制作用。方法建立肺癌皮下移植瘤模型;分离患者外周血单个核细胞,培养成熟的DC及CIK细胞;用反复冻融肺癌组织的方法制备肿瘤细胞裂解物并负载DC,诱导DC-CIK细胞;进行肺癌移植瘤内注射,比较两组裸鼠移植瘤体积及重量,观察其抑瘤情况。结果 DC-CIK细胞对肺癌皮下移植瘤细胞的抑制率为70.3%,抑制作用明显强于DC或CIK细胞的抑制作用(P0.05)。结论树突状细胞诱导的CIK细胞能够有效抑制肺癌移植瘤生长。