rmhTNF-αCombined with Cisplatin Inhibits Proliferation of A549 Cell Line In Vitro

Objective To explore the inhibitory effect of recombinant mutant human tumor necrosis factor-α （rmhTNF-α in combination with cisplatin on human lung adenocarcinoma cell line A549. Methods Human lung adenocarcinoma cell line A549 was treated with varying concentrations of rmhTNF- （0.38, 0.75, 1.50, 6.00 and 12.00 IU/ml） or cisplatin （3.91, 7.81, 15.63, 31.25 and 62.50 μg/ml） for 24 hours. Viable cell number was analyzed by using crystal violet staining. The inhibitory rates of A549 cells growth by the two drugs were calculated. For analyzing whether there was a synergistic effect of rmhTNF-α with cisplatin, A549 cells were treated with 0.75 IU/ml rmhTNF-α and increased concentrations of cisplatin. Results rmhTNF-α or cisplatin inhibited the growth of A549 cell lines in a dose-dependent manner. The inhibitory effect of rmhTNF-α combined with cisplatin was significantly greater than cisplatin alone at the same concentration （all P〈0.01）. Conclusion rmhTNF-α combined with cisplatin might have synergistic inhibitory effect on human lung adenocarcinoma cell line A549.     

Effects of Exogenous p16^ink4a Gene on Biological Behaviors of Human Lung Cancer Cells

The effects of exogenous p16ink4a gene on biological behaviors of human lung cancer cell line with homozygous deletion of p16ink4a gene were investigated. Exogenous p16ink4a gene was transfected by lipofectin into human lung cell line A549, in which p16ink4a gene was homozygously deleted. The expression of p16ink4a mRNA and protein was detected by RT-PCR and immunocyto-chemistry, respectively. The changes in the behaviors of the transfected cell lines in vitro and in vivo were observed. In the transfected cell line A549, the exogenous p16ink4a gene could be stably ex-pressed. The growth of A549 cells transfected with p16ink4a gene was obviously slowed down. Flow cytometry revealed that transfection of the exogenous p16ink4a gene resulted in A549 cell lines arrest in G1 phase of cell cycle. The tumorigenicity of these transfected cells in nude mice could be inhib-ited, and the tumor growth of nude mice was significantly suppressed. It was concluded that exoge-nous p16ink4a gene may be stably expressed in human lung cancer cell line A549. The expression of the introduced p16ink4a could block lung cancer cells to entry into S phase of cell cycle and inhibit tumor malignant growth both in vitro and in vivo.     

siRNA稳定靶向干扰HDGF肺腺癌细胞株的建立及干扰效率检测

目的 构建针对肝癌衍生生长因子(HDGF)基因的siRNA表达载体,建立稳定干扰HDGF基因表达的肺腺癌细胞株,检测干扰效率.方法 实时荧光定量PCR比较肺腺癌细胞株SPC-A-1、10例肺腺癌组织和其配对的癌旁肺组织HDGF基因表达差异.构建shRNA-HDGF慢病毒表达载体,测序鉴定序列的正确性.随后用脂质体的方法将载体转染入肺腺癌细胞株SPC-A-1中,经杀稻瘟菌素筛选后,稳定表达siRNA-HDGF的细胞株单克隆细胞株建立.实时荧光定量PCR检测干扰效率,筛选干扰效率最高的细胞株.结果 HDGF基因在腺癌细胞株SPC-A-1和肺腺癌组织明显高表达.测序证实,构人慢病毒载体中shRNA序列正确.一共筛选了5个siRNA-HDGF细胞株.与对照载体和单纯细胞株相比,最高干扰HDGF表达的效率为75%.结论 HDGF基因在肺腺癌细胞株及肺癌组织中高表达;针对HDGF的siRNA慢病毒表达载体成功构建;在其导人肺腺癌细胞株后能稳定干扰HDGF基因的表达.

Abstract：

Objective To construct a small interfering RNA (siRNA) expression vector targeting hepatoma-derived growth factor (HDGF) and establish a lung adenocarcinoma cell line stably expressing siRNA-HDGF. Mehtod RT-PCR was used to examine HDGF expression in lung adenocarcinoma samples and the matched adjacent lung tissues, and also in lung adenocarcinoma SPC-A-1 cell line. A recombinant lentivirus shRNA-HDGF vector was constructed and transfected into SPC-A-1 cells via Lipofectamine 2000, and the cells with stable expression of HDGF-siRNA was screened by blasticidin selection. The interference effect of siRNA-HDGF was assessed by real-time PCR. Results Compared to the adjacent lung tissues, lung adenocarcinoma and SPC-A-1 cells showed increased expression of HDGF. The recombinant lentivirus shRNA-HDGF vector was successfully constructed and verified by sequence analysis. siRNA-HDGF recombinants markedly inhibited the expression of HDGF in SPC-A-1 cells. Conclusion HDGF expression increases in lung adenocarcinoma and SPC-A-1 cell lines. The recombinant siRNA-HDGF lentivirus vector can inhibit the expression of HDGF in SPC-A-1 cells.     

Inhibitory Effect of Pulmonary Carcinoma by Adenovirus-Mediated CD/UPRT Gene

The cell killing effects and bystander effects of double suicide gene on pulmonary carcinoma cells were explored. Lung adenocarcinoma cells (A549) were transfected with different liters of adenovirus vector and followed with different concentrations of 5-FC after a recombinant adenovirus vector carrying CD/UPRT gene (Ad-CD/UPRT) was constructed. The cell viability was measured by MTT assay 4 days later. The cell viability was dropped to 30.57 %-8.62 % after 10 MOI of Ad-CD/UPRT transfected and 5-FC (10-1000μg/mL) administration. Furthermore, Ad-CD/UPRT-infected A549 cells showed a profound neighbor cell killing effect in the same methods. These results suggested that Ad-CD/UPRT/5-FC system can effectively suppress growth of lung adenocarcinoma cells, which may provide a novel and powerful candidate for lung cancer gene therapy strategies.     

Effect of antisense transfecting of monocarboxylate transporter gene on biological characteristics of lung adenocarcinoma A549 cells

Objective: To study the influence of transfecting antisense expression vector of the first subtype of the monocarboxylate transporter (MCT1) gene into lung cancer cells on pHi regulation, lactate transportation and cell growth. Methods: MCT1 antisense gene recombinant vector was introduced into human lung cancer cell line A549 by electroporation. The transfected A549 cells resistant to G418 were selected. Positive clones were examined by using PCR. The changes of intracellular pH and lactate were examined with spec-trophotometric method. Cell growth was studied with cell growth curve. Results: Intracellular pH and lactate were remarkably decreased in the cells transfected pLXSN-MCT1 in comparison with A549 cells without transfection (P<0. 001). The growth of A549 cells transfected pLXSN-MCTl was also inhibited remarkably. Conclusion: MCT1 gene may play an important role in pHi regulation, lactate transportation and cell growth in tumor cells.     

Human decorin regulates proliferation and migration of human lung cancer A549 cells

Background Decorin is a small leucine-rich proteoglycan and it plays an important role in regulation of cell growth and migration in various tumor cell lines. Decorin was found down-regulated in non-small cell lung cancer tissue and may be involved in regulation of lung cancer development. Methods In this study, lentivirus-mediated RNA interference and over expression were employed to change the expression levels of decorJn Jn lung cancer A549 cells. We tested the cell cycle of A549 cells and the expression of transforming growth factor （TGF）-[31, cyclin D1, epidermal growth factor receptor （EGFR）, P53, and P21. Results We found that up-regulation of decorin could inhibit proliferation, block cell cycle at G1 and decrease invasive activity of A549 cells. Moreover, we also show that up-regulation of decorin induced significant decreases of TGF-131, cyclin D1 expression, phosphorylation of EGFR, and increases of P53 and P21 expression. Opposite results were observed in A549 cells with down-regulation of decorin. Conclusion Our results suggest that decorin is a key regulator involved in proliferation and migration ofA549 cells.     

Effect of lumiracoxib on proliferation and apoptosis of human nonsmall cell lung cancer cells in vitro

Background Lumiracoxib is a highly selective cyclooxygenase-2 （COX-2） inhibitor with antiinflammatory, analgesic and antipyretic activities comparable with class specific drugs, but with much improved gastrointestinal safety. No studies have examined lumiracoxib for antitumorigenic activity on human nonsmall cell lung cancer cell lines in vitro or its possible molecular mechanisms. Methods The antiproliferative effect of lumiracoxib alone or combined with docetaxol on A549 and NCI-H460 lines was assessed by 3-（4, 5-dimethylthiazol-2-yl）-2, 5-diphenyltetrazolium bromide （MTT） assay. Drug-drug interactions were analyzed using the coefficient of drug interaction （CDI） to characterize the interactions as synergism, additivity or antagonism. Morphological changes were observed by acridine orange fluorescent staining. Extent of apoptosis was determined by flow cytometry. Results Lumiracoxib （15-240 pmol/L） has an inhibitory effect on the proliferation of A549 and NCI-H460 cell lines in concentration- and time-dependent manners with the ICso values of 2597 pmol/L and 833 pmol/L, respectively. The synergistic effect was prominent when lumiracoxib （15-240 pmoVL） was combined with docetaxol （0.2-2 pmol/L） （CDI 〈1）. Fluorescent staining showed that lumiracoxib could induce apoptosis in A549 and NCI-H460 cells. Lumiracoxib treatment also caused an increase of the sub-G1 fraction in each cell line and resulted in an increase of G0/Gl-phase cells and a decrease of S-phase cells. Conclusions Lumiracoxib had antiproliferative effect on the human nonsmall cell lung cancer cell lines A549 and NCI-H460 and had a significant synergy with docetaxol, which may be related to apoptotic induction and cell cycle arrest.     

EXPRESSION DIFFERENCES OF VASCULAR GROWTH FACTORS IN HUMAN LUNG ADENOCARCINOMA CELL LINE A549 AND CISPLATIN-RESISTANT HUMAN LUNG ADENOCARCINOMA CELL LINE A_(549)~(DDP)

Objective To elucidate the expression differences of vascular growth factors in human lungadenocarcinoma cell line A549 and cisplatin-resistant human lung adenocarcinoma cell line A549DDP . Methods RT-PCR and immunohistochemistry was used to detect the mRNA and protein expressions of vascular endothelial growth factor ( VEGF) and basic fibroblast growth factor ( bFGF) in A549 and A549DDP . Results VEGF and bFGF mRNA were expressed in A549 and in A549DDP VEGF and bFGF mRNA expression levels in A549DDP were significant higher than those in A549 (P< 0 .025 ). VEGF and bFGF protein expressions were all strong positive in A549 and A549DDP. Conclusion There are certain differences between VEGF and bFGF expressions in A549 and A549DDP . Drug-resistance of lung cancer is associated with those above genes over-expressions. Over-expression of vascular growth factors are related to drug resistance of lung cancer.     

Synthesis,characterization and cytotoxicity of platinum(II) complexes with 2-methyl-2-substituted phenoxypropanoic acid as leaving ligands

A class of novel platinum(II) complexes with 2-methyl-2-substituted phenoxypropanoic acids as leaving ligands were designed and synthesized.All complexes were characterized by IR,1H NMR and ESI-MS spectra.The in vitro antiproliferative activities were tested by MTT assay against three human cancer cell lines,indicating that the complexes showed selective cytotoxicity to human gastric cancer cell lines (SGC-7901) with only weak antiproliferative activities were observed against human hepatocellular carcinoma cell line (HepG2) and human non-small cell lung cancer cell line (A549).     

长链非编码RNA MUC5B-AS1在人肺腺癌细胞系中的功能研究

目的 研究lncRNA MUC5B-AS1基因在肺腺癌中的表达情况及对肺腺癌细胞系生物学行为的影响.方法 利用RT-PCR、qRT-PCR检测肺腺癌细胞系中MUC5B-AS1基因的表达情况;构建MUC5B-AS1过表达载体,通过转染构建MUC5B-ASI过表达细胞系;采用CCK-8检测肺腺癌细胞的增殖情况;应用Transwell小室检测MUC5B-AS1过表达对肺腺癌细胞系迁移和侵袭的影响.结果 检测了MUC5B-AS1在4株肺腺癌细胞系(A549、SPCA1、H1975和H1299)和1株肺正常上皮细胞系(HBE)中的表达情况,发现MUC5 B-AS1在H1299细胞系中表达最低,同时A549细胞系表达最高;通过转染构建MUC5B-AS1过表达H1299、A549细胞系,利用qRT-PCR检测细胞系中MUC5B-AS1基因的表达,与对照组比较,MUC5B-AS1基因在H1299、A549细胞系均升高,且有统计学差异(P ＜0.05);CCK-8检测细胞增殖,与对照组比较过表达MUC5B-AS1对H1299、A549细胞生长并无影响(P＞0.05);应用Transwell小室检测MUC5B-AS1过表达对肺腺癌细胞系迁移和侵袭,过表达MUC5B-AS1促进H1299、A549细胞的迁移和侵袭,差异有统计学意义(P＜0.05).结论 MUC5B-AS1可能在肺癌的迁移和侵袭发挥重要作用,但对肺腺癌细胞的增殖能力没有显著影响.     

沉默APE1对非小细胞肺癌细胞的放射敏感性的影响研究

目的 研究脱嘌呤脱嘧啶核酸内切酶-1（APE1）对非小细胞肺癌细胞放射敏感性的影响。方法 采用免疫组化染色检测手术标本切片（非小细胞肺癌组织20例及癌旁组织5例）中APE1的表达,Western blot与实时荧光定量（qRT）-PCR检测非小细胞肺癌细胞系（A549,H460,H1299）及肺正常上皮细胞系中APE1的表达;Western blot检测辐照A549与H460细胞0~6 Gy后APE1的表达;构建沉默APE1的A549与H460稳定细胞株后,Western blot检测其辐照6 Gy后APE1的蛋白表达;细胞克隆形成实验检测细胞克隆形成率;CCK-8检测细胞增殖;细胞术流式检测细胞凋亡。结果 非小细胞肺癌组织及细胞系中APE1的表达明显上调;辐照能诱导非小细胞肺癌细胞APE1的表达,且表达随辐照剂量增高而上调;沉默APE1能有效地抑制辐照诱导A549与H460细胞中APE1的表达;成功构建沉默APE1的A459、H460稳定细胞株;沉默APE1联合辐照进一步抑制了非小细胞肺癌细胞克隆形成率、细胞增殖率,同时促进细胞凋亡（ PAPE1可增强非小细胞肺癌细胞的放射敏感性。     

Glu-GNPs对人肺腺癌细胞株A549放射增敏的初步探讨

目的探讨偶联葡萄糖的纳米金颗粒(Glu-GNPs)对人A549细胞的放射增敏作用及其机制。方法噻唑蓝(MTT)法检测低浓度(≤20 nmol/L)Glu-GNPs联合放射对A549细胞存活的影响,克隆形成检测Glu-GNPs对A549细胞的放射增敏作用,流式细胞仪(FCM)检测细胞周期及其凋亡。结果低浓度Glu-GNPs对A549细胞生长无明显抑制,联合X射线后具有抑制作用,在15 nmol/L范围内,随浓度增大,抑制作用增强;15 nmol/LGlu-GNPs对A549细胞有放射增敏作用,由Dq、Do计算放射增敏比(SER)分别为1.93、1.10;Glu-GNPs、单纯放射均可诱导细胞凋亡,凋亡率分别为(7.64±1.43)%、(13.46±1.99)%,联合放射组凋亡率为(21.43±1.04)%,显著高于前两组(P<0.01);Glu-GNPs作用后,细胞周期发生变化,表现为S期减少,G2/M期增加(P<0.05)。结论 Glu-GNPs对人肺腺癌细胞株A549具有放射增敏作用,其机制可能为抑制细胞亚致死损伤修复,阻滞细胞于G2/M期,并诱导细胞凋亡。     

全反式维A酸对肺腺癌H1299细胞放射敏感性研究

目的探讨全反式维A酸（ATRA）对肺腺癌细胞株H1299放射敏感性影响及其分子机制。方法MTT法检测ATRA对H1299细胞存活率的影响;平板克隆形成实验检测H1299细胞的放射敏感性;流式细胞术检测细胞周期;Western blotting检测survivin与NF-κB的蛋白表达情况。结果不同浓度ATRA对H1299细胞均有抑制作用,浓度为10 μmol/L时最佳（P < 0.05）。相对单独ATRA处理,10 μmol/L ATRA联合不同剂量的射线照射后,细胞生长抑制率明显增加（P < 0.01）。ATRA作用和射线照射后的细胞凋亡增多（P < 0.01）,ATRA联合射线照射作用后的细胞总凋亡率明显高于单纯射线照射（P < 0.01）。与对照组、放射组、ATRA组相比,ATRA+放射组G0/G1期比例明显增加（P < 0.01）。与放射组相比,ATRA+放射组的细胞存活分数值降低,ATRA可以增加肺腺癌H1299细胞放射敏感性,增敏比为1.406。Western blotting结果显示,ATRA+放射组细胞survivin、NF-κB蛋白表达明显降低（P < 0.01）。结论ATRA对肺腺癌H1299细胞具有放射增敏作用,其机制可能与ATRA直接抑制H1299细胞增殖、促进H1299细胞凋亡,下调survivin及NF-κB蛋白表达有关。     

5-杂氮-2＇-脱氧胞苷对肺癌细胞小分子RNA let-7a-2表达的影响

目的：观察去甲基化药物对人肺癌A549和H1299细胞增殖、凋亡以及小分子RNA let-7a-2表达的影响.方法：以不同浓度的5-杂氮-2＇-脱氧胞苷（DAC）对肺癌细胞进行处理后,CCK-8检测对细胞增殖的影响,AnnexinV-PI双染法检测对细胞凋亡的影响,qRT-PCR对let-7a-2的表达进行检测.结果：A549和H1299细胞经不同浓度DAC处理后细胞增殖受到明显抑制,以60μM浓度DAC处理后d5抑制率分别为（40.80±6.50）％和（47.24±4.95）％（均P＜0.05）,同时细胞呈现显著性早期凋亡,凋亡百分比分别达（64.58±4.21）和（59.61±5.69）（均P＜0.05）.20μM、40μM、60μM DAC处理后let-7a-2的表达量在A549中分别为（10.86±0.30）、（5.02±2.83）、（17.79±1.95）,比对照组（1.12±0.24）显著上调;在H1299中分别为（55.13±5.69）、（35.67±4.13）、（14.94±2.46）,比对照组（1.31±0.56）显著上调.结论：DAC处理可抑制肺癌A549和H1299细胞增殖、促进细胞凋亡,上调let-7a-2的表达,let-7a-2基因调控区域超甲基化可能是其在肺癌细胞中表达异常的机制之一.     

非小细胞肺癌EGFR基因突变与放射敏感性的相关性

目的 探讨表皮生长因子受体(EGFR)基因突变与非小细胞肺癌(NSCLC)放射敏感性的相关性及可能机制.方法 选取EGFR基因突变的NSCLC细胞株PC-9、H1975和EGFR野生型NSCLC细胞株A549.克隆成型实验检测放射敏感性,流式细胞术检测细胞凋亡和细胞周期,Western blot检测凋亡蛋白和修复蛋白表达.结果 PC-9、H1975细胞放射敏感性明显高于A549细胞,4Gy照射下克隆存活率分别为10.0％、5.5％和44.3％;4 Gy照射后48 h PC-9和H1975细胞凋亡率显著高于A549细胞,分别为18.300％、17.533％和11.733％.A549细胞发生G0/G1期阻滞显著高于PC-9、H1975细胞,4Gy照射后48 h G0/G1期细胞分别为74.480％、70.293％和57.016％.A549细胞在4Gy照射后促凋亡蛋白Bax表达缺失,凋亡蛋白Caspase-3、抗凋亡蛋白Bcl-2、修复蛋白DNA-PKcs在24 h仍有表达.而PC-9、H1975细胞在4Gy照射后Bax、Caspase-3表达增多,Bcl-2不表达,DNA-PKcs表达减少.结论 EGFR 19外显子缺失突变细胞PC-9和21外显子点突变细胞H1975,相对EGFR野生型细胞A549对放射线敏感,其机制与细胞周期G0/G1期阻滞、Bax表达增多、DNA-PKcs、Bcl-2表达降低有关.     

敲低galectin-1可抑制肺腺癌细胞的增殖、迁移和侵袭并促进其凋亡

目的 探讨半乳糖凝集素-1（galectin-1）对肺腺癌细胞的影响及其机制。方法 收集并比较肺腺癌组织和癌旁正常组织galectin-1的表达水平。qRT-PCR法检测肺腺癌细胞系A549、H1299与正常支气管上皮细胞细胞BEAS-2b中galectin-1的表达差异。通过si-RNA敲低galectin-1,分为对照组和si-RNA组,对照组转染同剂量NC-siRNA片段。通过qRT-PCR和Westernblot检测galectin-1mRNA和蛋白水平的表达情况。CCK8、Transwell实验、划痕实验和流式细胞术检测敲低galectin-1后对肺腺癌细胞增殖能力、侵袭和迁移能力和细胞凋亡的情况。Western blot检测敲低galectin-1后凋亡相关蛋白BAX、BCL-2、Caspase3等蛋白和AKT、ERK二条通路蛋白的相对表达情况。结果 galectin-1的mRNA在肺癌组织和肺腺癌细胞株中表达量明显升高（P<0.05）。抑制galectin-1表达后,细胞增殖、迁移和侵袭等下降,凋亡率明显升高（P<0.05）。在抑制galectin-1表达后,ERK信号通路磷酸化水平明显降低（P<0.05）。结论 galectin-1具有抑制肺腺癌细胞增殖、迁移、侵袭和促进其凋亡的作用,其机制可能与ERK通路的磷酸化激活水平有关。     

人肺癌细胞系A549中肿瘤干细胞样细胞的分离及鉴定

目的从人肺癌细胞系A549中分离并鉴定肺癌干细胞。方法将A549细胞置于无血清条件培养基中培养,形成细胞球,采用平皿克隆形成实验、MTT细胞增殖实验、RT-PCR、Western blot、免疫荧光技术,检测并比较A549细胞和A549细胞球的增殖能力及干细胞相关标记的表达水平,鉴定细胞球的肿瘤干细胞特性。结果利用无血清条件培养基从A549细胞中分离出肿瘤干细胞样细胞;相比A549细胞,细胞球呈悬浮生长,增殖能力和克隆形成数目(104±7)高于贴壁细胞[(37±3)(P<0.05)],且干细胞相关标记Sox2(2.68±0.39)和Oct4(1.23±0.12)表达水平明显提高[贴壁细胞Sox2(0.05±0.02)、Oct4(0.10±0.02),P<0.05]。结论运用无血清条件培养基可以从A549细胞系中有效富集肺癌干细胞样细胞。     

纳米砷与三氧化二砷的体外细胞毒性比较研究

目的通过比较三氧化二砷与纳米元素砷两种砷制剂在体外对肺腺癌细胞株以及正常小鼠淋巴细胞的影响，对纳米砷制剂的作用进行初步评估。方法将不同浓度的纳米砷或三氧化二砷与肺腺癌细胞株A549或H1299细胞体外作用2d，将不同浓度的纳米砷或三氧化二砷与小鼠脾细胞作用24h，将不同浓度的纳米砷或三氧化二砷加白细胞介素2与小鼠脾细胞作用72h。随后以MTT检测法分别检测各组的杀伤率。结果纳米砷与三氧化二砷对肺腺癌细胞株A549或H1299的杀伤率，在相同摩尔药物浓度下很接近。三氧化二砷与纳米砷对小鼠脾脏淋巴细胞与rIL-2活化的淋巴细胞的毒性作用也相当接近，且三氧化二砷与纳米砷在低浓度1．5umol／L时，其杀伤率巳达40％以上，二者差异无显著性（P〉0．05）。结论纳米元素砷具有较强抗癌活性，但其对正常淋巴细胞的毒性与三氧化二砷相比未见减轻。这对于笔者加深对纳米元素的认识，具有一定的意义。