Inhibition of adenovirus-mediated p27kip1 gene on growth of esophageal carcinoma cell strain

AIM: To investigate the inhibition of p27kip1 gene on the growth of esophageal carcinoma cell strain (EC9706). METHODS: Recombinant adenovirus Ad-p27kip1 was constructed and transfected into esophageal carcinoma cell EC-9706, and its effect on p27kip1 expression, the growth of esophageal carcinoma cell, DNA replication, protein synthesis, cell multiplication and apoptosis were explored by means of cell growth count, 3H-TdR, 3H-Leucine incorporation, flow cytometry, DNA fragment analysis and TUNEL. RESULTS: Recombinant adenovirus Ad-p27kip1 was successfully constructed with a virus titer of 1.24 X 10(12) pfu/ml. p27kip protein expression increased markedly after EC-9706 transfection, while incorporation quantity of 3H-TdR and 3H-Leucine decreased significantly. The growth of esophageal carcinoma cell was inhibited obviously. Testing of flow cytometry displayed a typical apoptosis peak, and DNA gel electrophoresis showed a typical apoptosis ladder. TUNEL showed the apoptosis rate of Ad-p27kip1 group and control group to be 37.3% and 1.26% (P<0.001) respectively. CONCLUSION: Ad-p27kip1 can inhibit the growth and multiplication of esophageal carcinoma cells and induce apoptosis. Therefore, enhanced p27kip1 expression may be a new way to treat esophageal carcinoma.     

p27kip1基因转移对食管癌细胞生存素表达和端粒酶活性的影响

背景：p27kip1是新近发现的一种抑癌基因，早期研究表明p27kip1基因转移能显著抑制食管癌细胞和人食管癌裸鼠移植瘤的生长，表明该基因疗法可能是食管癌治疗的新途径，但其抑癌机制尚未完全阐明。目的：研究p27kip1基因转移对食管癌细胞生存素（survivin）表达和端粒酶活性的影响。从而阐明p27kip1的抑癌机制，为p27kip1基因治疗食管癌提供理论依据。方法：将携带p27kip1基因的重组腺病毒（Ad—p27kip1）和LacZ重组腺病毒（Ad—LacZ）分别转染食管癌细胞系Eca9706，观察细胞形态变化。以免疫细胞化学染色和蛋白质印迹法检测p27kip1和生存素的表达．以端粒重复序列扩增程序（TRAP）聚合酶链反应（PCR）-酶联免疫吸附测定（ELISA）检测端粒酶活性。结果：经Ad—p27kip1转染后，Eta9706细胞变圆，呈葡萄串样聚集以致脱落。细胞p27kip1表达明显增强，生存素表达降低，端粒酶活性显著受抑制。结论：p27kip1基因抑制食管癌细胞生长的作用机制可能与下调生存素表达和抑制端粒酶活性有关。     

顺铂对食管癌细胞周期及端粒酶活性的影响

目的 研究顺铂对食管癌细胞周期和端粒酶活性的影响，为其临床应用提供理论依据。方法 用2μg/ml顺铂处理食管癌EC9706细胞，流式细胞仪分析细胞周期的改变，TRAP—ELISA法检测细胞端粒酶活性的改变。结果 顺铂可使食管癌细胞阻滞于S期，诱导细胞凋亡；同时降低食管癌端粒酶活性。结论 顺铂对食管癌有治疗作用，端粒酶活性可作为观察食管癌化疗疗效的一个指标。     

miR-451对食管癌EC9706细胞增殖、凋亡及侵袭能力的影响

目的:探讨miR-451对食管癌EC9706细胞增殖、凋亡及侵袭能力的影响.方法:化学合成miR-451mimics,脂质体包裹转染EC9706细胞为miR-451组,同时设立无关序列(Scramble-miR)对照组、脂质体对照组和空白对照组.转染后48h,荧光定量RT-PCR检测miR-451表达量的变化,Westernblot检测Bcl-2、AKT和磷酸化AKT蛋白表达水平,流式细胞仪检测细胞凋亡情况,Transwell侵袭实验检测细胞侵袭能力的改变;MTT法检测转染后l、2、3、4、5、6d各组细胞增殖率.结果:miR-451组的miR-451表达水平显著上调(P<0.01,F=69.26),为空白对照组的15.84倍;miR-451组细胞Bcl-2、AKT和磷酸化AKT蛋白表达均显著下调(P<0.05,F=5.83);miR-451组细胞凋亡率为12.07%±1.12%,与3个对照组比较显著升高(P<0.01,F=26.72);miR-451组平均侵袭细胞数为47.4±7.4,与3个对照组比较显著降低(P<0.01,F=34.55).miR-451组细胞的生长在转染后2d出现显著抑制(P<0.05,F=5.95),并且随时间的延长而日益显著.结论:上调miR-451表达可抑制食管癌EC9706细胞增殖和侵袭,促进细胞凋亡.     

转染kiss-1基因对人食管癌EC9706细胞裸鼠移植瘤的抑制作用

目的:研究转染kiss-1基因对人食管癌EC9706细胞裸鼠皮下移植瘤的作用,探讨其在食管癌基因治疗中的可行性和特异性.方法:在食管癌细胞系EC9706中转染kiss-1基因,经G418筛选,建立稳定高表达Kiss-1蛋白的细胞系.稳定表达该基因的细胞为转染kiss-1基因组,转染空质粒细胞及未处理细胞为对照组,建立裸鼠荷瘤模型;监测肿瘤生长变化,HE染色观察肿瘤病理学变化,RT-PCR、Western blot方法检测kiaa-1 mRNA和蛋白变化.结果:转染kiss-1基因组肿瘤生长受到显著抑制:HE染色显示转染kiss-1基因组及转染空质粒纽肿瘤组织内坏死均较空白对照组多;RT-PCR、Western blot结果表明转染kiss-1基因组裸鼠肿瘤组织kiss-1 mRNA和蛋白表达均显著升高,三组间比较差异具有统计学意义(F=72.685,24.807,均P<0.05).结论:转染kiss-1基因能抑制人食管癌EC9706细胞裸鼠皮下移植瘤的形成,且能有效上调kiss-1 mRNA和蛋白的表达,可为食管癌的基因治疗提供新的靶点、开辟新的思路.     

硒蛋氨酸诱导食管癌细胞株凋亡的实验研究

目的：探讨硒蛋氨酸对食管癌细胞系EC 9706凋亡的影响。方法：采用MTT比色法，细胞生长曲线描绘观察硒蛋氨酸对食管癌细胞系EC 9706增殖的影响。采用流式细胞仪观察硒蛋氨酸对EC 9706细胞诱导其凋亡的作用及对细胞周期的影响。琼脂糖凝胶电泳法检测DNA ladder。结果：硒蛋氨酸呈时间、剂量依赖性方式抑制EC 9706细胞增殖，改变细胞周期分布，增加G0／G1期细胞比例，诱导细胞凋亡。结论：硒蛋氨酸可能通过影响细胞周期分布和诱导细胞凋亡，从而抑制EC 9706细胞增殖。硒蛋氨酸可能是预防和治疗食管癌的一种新制剂。     

p27kip1腺病毒重组体对人食管癌裸鼠移植瘤生长的抑制作用

D27kip1是新近发现的一种抑癌基因，研究表明p27kip1基因转移能显著抑制食管癌和胃癌细胞生长，该基因疗法在体内实验中是否同样有效值得进一步研究。目的：研究p27kip1腺病毒重组体对人食管癌裸鼠移植瘤生长的抑制作用。方法：将携带人p27kip1基因的重组腺病毒载体导人人食管癌裸鼠移植瘤中．测定肿瘤生长抑制率．免疫组化方法检测移植瘤中p27kip1和生存素(survivin)的表达。结果：经p27kip1基因治疗的裸鼠，肿瘤生长抑制率达64．1％，移植瘤中p27kip1呈高表达．生存素呈低表达。结论：p27kip1腺病毒重组体能显著抑制人食管癌裸鼠移植瘤的生长．上调p27kin1和下调生存素的表达可能是其雷要作用机制。     

Expression properties of recombinant pEgr-P16 plasmid in esophageal squamous cell carcinoma induced by ionizing irradiation

AIM: To construct the recombinant pEgr-P16 plasmid for the investigation of its expression properties in esophageal squamous cell carcinoma induced by ionizing irradiation and the feasibility of gene-radiotherapy for esophageal carcinoma. METHODS: The recombinant pEgr-P16 plasmid was constructed and transfected into EC9706 cells with lipofectamine. Western blot, quantitative RT-PCR and flow cytometry were performed to study the expression of pEgr-P16 in EC9706 cells and the biological characteristics of EC9706 cell line after transfection induced by ionizing irradiation. RESULTS: The eukaryotic expression vector pEgr-P16 was successfully constructed and transfected into EC9706 cells. The expression of P16 was significantly increased in the transfected cells after irradiation while the transfected cells were not induced by ionizing irradiation. The induction of apoptosis in transfection plus irradiation group was higher than that in plasmid alone or irradiation alone. CONCLUSION: The combination of pEgr-P16 and irradiation could significantly enhance the P16 expression property and markedly induce apoptosis in EC9706 cells. These results may lay an important experimental basis for gene radiotherapy for esophageal carcinoma.     

环氧合酶-2反义RNA在不同时间点对食管癌细胞系EC9706生长的影响

目的:探讨环氧合酶-2(COX-2)反义RNA在不同时间点对人食管癌细胞系EC9706生长的影响。方法:培养293细胞,扩增、纯化COX-2反义RNk的重组腺病毒-Ad-AShcox-2,转染食管癌细胞EC9706,在不同时间点进行活细胞计数及3H-TdR掺入量测定。结果:扩增、纯化获得编码COX-2反义RNA的重组腺(?)毒Ad-AShcox-2,滴度达1.2×1012 PFU/ml;Ad-AShcox-2传染EC9706后在24 h、48 h、72 h、96 h对细胞生长的抑制率分别为8.60％、24.33％、50.21％、75.26％,对3H-TdR掺入量在24 h开始减少,以72～96 h最低,与对照组比较P<0.001。结论:表达COX-2反义RNA重组腺病毒感染人食管癌细胞后,对癌细胞的抑制从24 h开始,48～72 h最明显。     

体外研究腺苷酸活化蛋白激酶对食管鳞癌EC9706细胞增殖及凋亡的影响

目的通过体外研究观察腺苷酸活化蛋白激酶(AMPK)的激活剂AICAR对人食管癌EC9706细胞的增殖及凋亡影响。方法 AICAR以不同浓度作用于人食管癌EC9706细胞,通过光学显微镜观察不同时间后EC9706细胞的生长状态,并用MTT方法检测其吸光度值及细胞存活率的变化,流式细胞术检测其细胞凋亡率情况。结果随着AICAR浓度的增加,细胞的死亡数目明显增加。MTT法检测结果表明,AICAR能够抑制EC9706细胞增殖,并呈现出良好的浓度依赖性。流式细胞术检测结果显示,不同浓度的AICAR干预24 h后早期凋亡率、晚期凋亡率及总凋亡率均高于对照组,但仅有总凋亡率有统计学意义(P0.01)。结论 AMPK可以抑制人食管癌EC9706细胞的生长增殖,并可诱导EC9706细胞凋亡。     

Adenovirus expressing p27kip1 suppresses growth of established esophageal carcinoma xenograffs

AIM: To investigate the growth suppression of adenovirus expressing p27kip1 on established esophageal tumors in nude mice.METHODS: Esophageal carcinoma xenografts in nude mice were established by tumor tissue mass transplantation. The successfully constructed recombinant adenoviral vectors carrying p27kip1 gene (Adp27kip1) were directly injected into the esophageal tumors in nude mice. Compared to control group, the growth curve of tumor was drawn and the growth inhibition rate of tumor was calculated. The histology of tumors was examined by hematoxylin and eosin (H&E) staining. The expression of p27kip1 and survivin was detected in tumors by immunohistochemical technique.RESULTS: The growth of tumors in gene therapy group with Ad-p27kip1 was obviously suppressed compared to control group (0.42±0.08 g vs 1.17±0.30 g, t=6.39,P＜0.01), the inhibition rate of tumor growth reached 64.1%. Pathological detection showed that the tumors in nude mice were poorly differentiated esophageal squamous carcinoma. In addition, the expression of p27kip1 was increased, while the expression of survivin was decreased in tumors after being transfected with Ad-p27kip1.CONCLUSION: p27kip1 gene therapy mediated by adenovirus vector has a significant inhibitory effect on esophageal carcinoma in vivo. Up-regulated p27kip1expression and down-regulated survivin expression may be its important mechanisms.     

Adenovirus expressing p27kip1 suppresses growth of established esophageal carcinoma xenografts

AIM: To investigate the growth suppression of ade novirus expressing p27kip1 on established esophageal tumors in nude mice. METHODS: Esophageal carcinoma xenografts in nude mice were established by tumor tissue mass transplantation. The successfully constructed reco mbinant adenoviral vectors carrying p27kip1 gene (Ad p27kip1) were directly injected into the esophageal tumors in nude mice. Compared to control group, the growth curve of tumor was drawn and the growth inhibition rate of tumor was calculated. The histology of tumors was examined by hematoxylin and eosin (H&E) staining. The expression of p27kip1 and survivin was detected in tumors by immunohistochemical technique. RESULTS: The growth of tumors in gene therapy group with Ad-p27kip1 was obviously suppressed compared to control group (0.42±0.08 g vs 1.17±0.30 g, t=6.39, P<0.01), the inhibition rate of tumor growth reached 64.1%. Pathological detection showed that the tumors in nude mice were poorly differentiated esophageal squamous carcinoma. In addition, the expression of P27kip1 was increased, while the expression of survivin was decreased in tumors after being transfected with Ad-p27kip1. CONCLUSION: p27kip1 gene therapy mediated by adenovirus vector has a significant inhibitory effect on esophageal carcinoma in vivo. Up-regulated p27kip1 expression and down-regulated survivin expression may be its important mechanisms.     

Inhibitory effects of N-（4-hydrophenyl） retinamide on liver cancer and malignant melanoma cells

AIM: To investigate the effect of N-(4-hydrophenyl) retinamide(4-HPR), the derivative of retinoic acid, on inhibition of migration, invasion, cell growth, and induction of apoptosis in hepatocellular carcinoma cells(HCCs) and malignant melanoma cells. METHODS: 4-HPR was chemically synthesized. Cellular migration and invasion were assayed by Borden chamber experiment. Cell growth was assayed by MTT chromometry. Apoptosis effect was measured using Hoechst 32258 staining and flow cytometry. Gene transfection was performed with lipofectamine. RESULTS: We observed that the migration of HCC and melanoma cells was significantly suppressed by 4-HPR and the migration cells were reduced to 58±5.03(control 201±27.2, P<0.05, n=4) in SMMC 7721-k3 HCC, and to 254±25.04(control 302±30.1, P<0.05, n=4) in melanoma cells after 6-h incubation with 4-HPR. The invasion through reconstituted basement membrane was also significantly reduced by 4-HPR treatment to 11.2±3.3 in SMMC 7721-k3 HCC(control 27±13.1), and to 24.3±3.2 in melanoma cells(control 67.5±10.1, P<0.05, n=3). Cell growth, especially in melanoma cells, was also significantly inhibited. Furthermore, 3μmol/L of 4-HPR induced apoptosis in B16 melanoma cells(37.11±0.94%) more significantly than all-trans retinoic acid(P<0.05), but it failed to induce apoptosis in SMMC 7721-k3 HCC. The mechanism for 4-HPR-induced apoptosis was not clear, but we observed that 4-HPR could regulate p27~(kip1), and overexpression of cerebroside sulfotransferase(CST) diminished the apoptosis induced by 4-HPR in melanoma cells. CONCLUSION: 4-HPR is a potent inhibitor of HCC migration and inducer of melanoma cell apoptosis. CST and p27~*(kip1) expression might be associated with 4-HPR-induced apoptosis.     

Nimesulide inhibits proliferation via induction of apoptosis and cell cycle arrest in human gastric adenocarcinoma cell line

AIM: To evaluate the potential role of Nimesulide, a selective COX-2 inhibitor, in proliferation and apoptosis of gastric adenocarcinoma cells SGC7901. METHODS: Cell counts and MTT assay were used to quantify the influence of Nimesulide in the proliferation of SGC7901 cells. Transmission electron microscopy and flow cytometry were used to observe the induction of Nimesulide the apoptosis of SGC7901 cells and influence in the distribution of cell cycle. The expression of P27(kip1) protein was observed by immunocytochemical staining. RESULTS: SGC-7901 Cells treated with Nimesulide at various concentrations exhibited a profound dose- and time-dependent reduction in the proliferation rate over the 72 h test period. The highest survival rate of the cells was 78.7 %, but the lowest being 22.7 %. Nimesulide induced apoptosis of the cells in a dose-dependent and non-linear manner and increased the proportion of cells in the G(0)/G(1) phase and decreased the proportion in the S and G(2)/M phase of the cell cycle. Meanwhile, Nimesulide could up-regulate the expression of P27(kip1) protein. CONCLUSION: The induction of apoptosis and cell cycle arrest are both anti-proliferative responses that likely contribute to the antineoplastic action of nimesulide on SGC-7901 cells. The up-regulation of P27(kip1) gene may contribute to the accumulation of these cells in the G(0)/G(1) phase following treatment with Nimesulide. Selective COX-2 inhibitor may be a new channel of the chemoprevention and chemotherapy for gastric carcinoma.     

Effect of mutant p27kip1 gene on human cholangiocarcinoma cell line, QBC939

AIM:To investigate the effects of exogenously mutated p27kip1 (p27) on proliferation and apoptosis of human cholangiocarcinoma cell line,QBC939 in vivo.METHODS:Adenviral vectors were used to transfect mutated p27 cDNA into human QBC939 cell line.Expression of p27 was detected by RT-PCR.Western blot.Cell growth,morphological change,cell cycle,apoptosis and cloning formation were determined by MTT assay and flow cytometry.RESULTS:The expression of p27 protein and mRNA was increased significantly in QBC939 cell line transfected with Ad-p27mt.The transfer of Adp27mt could significantly inhibit the growth of QBC939cells,decrease the cloning formation rate and induce apoptosis,p27 over expression caused cell cycle arrest at G0/G1 phase 72 h after infection with Adp27mt.CONCLUSION:p27 may cause cell cycle arrest at G0/G1 phase and subsequently lead to apoptosis.Recombinant adenovirus expressing mutant p27 may be potentially useful in gene therapy for cholangiocarcinoma.     

己酮可可碱对人食管癌细胞EC9706的5-Fu化疗增敏作用

目的探讨己酮可可碱对人食管癌细胞EC9706的5-Fu化疗增敏作用。方法采用MTT法测定5-Fu及己酮可可碱联合5-Fu对EC9706细胞的抑制作用。结果不同浓度的己酮可可碱联合5-Fu作用于EC9706 12、24、48、72 h,同一时间各组抑制率差异有统计学意义(P均<0.01),同一5-Fu浓度,随着己酮可可碱药物浓度的增加,5-Fu对己酮可可碱细胞的抑制作用也增强(P均<0.01)。25μg/mL 5-Fu联合己酮可可碱(0.5 mg/mL、1.0mg/mL)与50μg/mL 5-Fu对EC9706细胞抑制作用,在24、48、72 h无统计学差异(P均>0.05)。结论己酮可可碱可以增加EC9706细胞对5-Fu的敏感性,减少5-Fu的剂量。     

MiR-451 inhibits proliferation of esophageal carcinoma cell line EC9706 by targeting CDKN2D and MAP3K1

AIM: To investigate the underlying molecular mechanisms of miR-451 to inhibit proliferation of esophageal carcinoma cell line EC9706.METHODS: Assays for cell growth, apoptosis and invasion were used to evaluate the effects of miR-451 expression on EC cells. Luciferase reporter and Western blot assays were used to test whether cyclin-dependent kinase inhibitor 2D(CDKN2D) and MAP3K1 act as major targets of miR-451.RESULTS: The results showed that CDKN2 D and MAP3K1 are direct targets of miR-451. CDKN2 D and MAP3K1 overexpression reversed the effect of miR-451.MiR-451 inhibited the proliferation of EC9706 by targeting CDKN2 D and MAP3K1.CONCLUSION: These findings suggest that miR-451 might be a novel prognostic biomarker and a potential target for the treatment of esophageal squamous cell carcinoma in the future.     

Construction of pETNF-P16 plasmid and its expression properties in EC9706 cell line induced by X-ray irradiation

AIM: Recombined plasmid pETNF-P16 was constructed to investigate its expression properties in esophageal squamous carcinoma cell line EC9706 induced by X-ray irradiation and the feasibility of gene-radiotherapy for esophageal carcinoma. METHODS: Recombined plasmid pETNF-P16 was constructed and transfected into EC9706 cells with lipofectamine. ELISA,Western blot, and immunocytochemistry were performedto determine the expression properties of pETNF-P16 in EC9706 after transfection induced by X-ray irradiation. RESULTS: Eukaryotic expression vector pETNF-P16 was successfully constructed and transfected into EC9706 cells. TNFα expressions were significantly increased in the transfected cells after different doses of X-ray irradiation than in those after 0Gy irradiation (1 192.330-2 026.518 pg/mL,P&lt;0.05-0.01), and the TNFα expressions and P16 were significantly higher 6-48 h after 2 Gy X-ray irradiation (358.963-585.571 pg/mL, P&lt;0.05-0.001). No P16 expression was detected in normal EC9706 cells. However, there was strong expression in the transfected and irradiation groups. CONCLUSION: X-ray irradiation induction could significantly enhance TNFα and P16 expression in EC9706 cells transfected with pETNF-P16 plasmid. These results may provide important experimental data and therapeutic potential for gene-radiotherapy of esophageal carcinoma.     

干扰LINC00707对食管癌细胞生物行为的影响

目的 探讨干扰LINC00707对食管癌细胞生物行为的影响及分子机制.方法 选取51例食管癌患者癌组织及癌旁正常组织,用实时荧光定量-聚合酶链反应(RT-qPCR)检测LINC00707和miR-382-5p的表达水平;将食管癌细胞EC9706随机分为对照(con)组、si-LINC00707组、si-NC组、miR-...