表皮生长因子受体抑制剂吉非替尼对食管癌EC9706细胞增殖、凋亡及细胞周期的影响

目的探讨表皮生长因子受体(EGFR)抑制剂吉非替尼对食管癌EC9706细胞增殖、凋亡和细胞周期的影响。方法将EC9706细胞培养并加入不同浓度的吉非替尼处理不同时间后,采用MTT法检测细胞增殖抑制率;Annexin V-FITC/PI双染法、流式细胞仪检测细胞凋亡率。PI染色、流式细胞仪检测细胞周期。结果吉非替尼对食管癌EC9706细胞增殖具有明显的抑制作用,且表现为剂量和时间依赖性;吉非替尼组细胞凋亡率明显高于正常对照组,且随着吉非替尼剂量的增加,凋亡率逐渐增加(P0.05);与对照组相比,10μg/ml吉非替尼处理24 h后的EC9706细胞,处于G0/G1期细胞比例明显增加,处于S期细胞比例明显减少(P0.05)。结论吉非替尼对食管癌EC9706细胞具有明显的增殖抑制作用,其机制与诱导凋亡及阻滞细胞周期有关。     

孕烷X受体抗食管癌EC9706细胞凋亡的作用机制

目的 研究孕烷X受体(PXR)抗食管癌EC9706细胞凋亡的作用机制.方法 使用利福平活化食管鳞癌EC9706细胞中的PXR,阿霉素(ADM)诱导高表达PXR的EC9706细胞凋亡,采用流式细胞仪观察细胞的增殖周期,MTT法观察细胞凋亡率,Western印迹和免疫组化法检测Caspase-3,Bcl-2,Bax蛋白表达情况.结果 ADM处理可以明显抑制细胞生长;使细胞呈明显凋亡改变;利福平诱导PXR高表达的EC9706细胞凋亡减少,抑制Caspase-3的蛋白水平,上调蛋白Bcl-2的表达,表明PXR在抗食管鳞癌细胞凋亡中发挥重要的作用.结论 PXR可能是通过降低Caspase-3和升高Bcl-2蛋白的表达抑制食管癌细胞EC9706的凋亡.     

环氧合酶-2选择性抑制剂NS-398诱导食管癌细胞EC 9706凋亡及其机制的探讨

目的 观察环氧合酶-2(COX-2)选择性抑制剂NS一398对食管癌细胞株EC 9706增殖及凋亡的影响,砌究其对凋亡抑制蛋白Survivin和Caspase-3表达的影响,探讨NS-398诱导Ec 9706细胞凋亡的作用机制.方法 NS-398作用EC 9706细胞后,MTT法测定NS-398对人食管癌EC 9706细胞增殖的抑制率;DNA片段分析法和流式细胞仪检测细胞凋亡;免疫细胞化学检测Survivin和Caspase-3蛋白表达变化.结果 NS-398(10～100μmol/L)对EC 9706细胞生长有抑制作用,随浓度升高、时间延长抑制作用增强,并诱导EC 9706细胞凋亡,呈剂量-时间效应关系;NS-398可降佴Survivin蛋白表达,增加Caspase-3蛋白表达.结论 NS-398可诱导人食管癌细胞株EC 9706凋亡,其机制可能与下调Survivin表达及激活Capase-3表达有关.     

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。     

丹皮酚联合5-FU对食管癌EC9706细胞增殖及凋亡的影响

目的:探讨丹皮酚(paeonol,Pae)单独及联合5-Fu对人食管癌EC9706细胞的增殖抑制及凋亡诱导作用.方法:采用6种浓度的Pae(7.81、15.63、31.25、62.50、125.00、250.00 mg/L)、3种浓度的5-FU(12.50、25.00、50.00 mg/L)及Pae(31.25 mg/L)和5-FU(12.50 mg/L)联合分别处理EC9706细胞24、48、72 h.同时设对照组(细胞不做处理),采用MTT法检测各个时间段细胞的增殖情况:采用流式细胞术检测4种浓度的Pae(31-25、62.50、125.00、250.00 mg/L)处理EC9706细胞72 h后细胞周期的变化:倒置显微镜下观察各Pae组细胞各时间段形态学变化,HE染色光镜下观察凋亡细胞:采用免疫细胞化学法检测经Pae(31.25 mg/L)、5-FU(12.50mg/L)单独和联合作用48 h后细胞中凋亡相关蛋白Bcl-2及Bax的表达.结果:Pae、5-FU可明显抑制EC9706细胞增殖,并随着浓度的增加和作用时间的延长而增强(P<0.05),Pae与5-FU联合用药比单用Pae或5.FU抑制效果更明显(P<0.05);Pae作用后EC9706细胞中G0/G1期和G2/M期细胞比例下降、S期细胞比例上升(Pae 125.00 mg/L组:G0/G1期21.18%±2.28% vs 62.17%±5.23%、G2/M期0.76%±0.54% vs 9.92%±3.10%、S期78.06%±2.82% vs 27.91%±2.13%,均P<0.05):HE染色光镜下可见典型的肿瘤细胞凋亡改变:Pae、5-FU可下调EC9706细胞中Bcl-2蛋白表达,同时增强EC9706细胞中Bax蛋白的表达,联合用药组较单药组作用更为明显(2.21±0.14 vs 5.67±0.30,4.22±0.34;8.55±0.33 vs 3.90±0.27,6.28±0.26,均P<0.05).结论:Pae可明显抑制人食管癌EC9706细胞的增殖.促进其凋亡,Pae联合5-FU作用更为明显.     

曲古霉素A对食管癌细胞系EC9706细胞凋亡的作用及机制

目的探讨曲古霉素A（TSA）对食管癌细胞系EC9706细胞凋亡的影响及机制。方法用AnnexinV-FITC和PI进行双染色,流式细胞仪检测细胞凋亡率,Western blot检测TSA对食管癌细胞凋亡相关基因表达的影响。结果 1.0μmol/L的TSA诱导EC9706细胞凋亡率增加（P〈0.05）,且呈浓度依赖性;0.5μmol/L的TSA作用48 h后细胞凋亡率增加（P〈0.05）,呈时间依赖性。TSA处理的EC9706细胞Bax蛋白表达增加,Bcl-2蛋白表达减少;TSA诱导EC9706细胞caspase-8及caspase-9裂解活化,且随作用时间延长逐步升高。结论一定量的TSA可以诱导EC9706细胞凋亡,凋亡原因与Bax表达增强、Bcl-2减少以及凋亡细胞中caspase-8及caspase-9介导的caspase-3活化有关。     

顺铂诱导食管癌EC9706耐药细胞中Bcl-2的表达

目的探讨凋亡抑制蛋白Bcl-2在顺铂(DDP)诱导食管癌EC9706耐药细胞中的表达。方法建立EC9706/DDP细胞,流式细胞仪检测细胞凋亡率,四甲基偶氮唑蓝(MTT)法检测细胞存活率,Western印迹检测DDP处理后EC9706细胞及EC9706/DDP细胞Bcl-2蛋白表达,RTPCR、荧光定量PCR检测Bcl-2 mRNA水平。结果 EC9706/DDP细胞对DDP诱导的凋亡不敏感,Western印迹检测到EC9706/DDP细胞中Bcl-2表达上调,与EC9706细胞相比具有统计学意义(P0.05)。RT-PCR、荧光定量PCR检测到EC9706/DDP细胞中Bcl-2 mRNA水平上调,与EC9706细胞相比具有统计学意义(P0.05)。结论 Bcl-2表达上调可能为食管癌EC9706细胞对DDP耐药的重要机制。     

稳定干扰Pin1基因的食管癌细胞株的筛选及其生物学特征

目的:筛选稳定干扰Pin1的食管癌细胞系,研究Pin1表达与食管癌细胞生物学特征的关系.方法:将针对Pinl1基因的shRNA(pmU6-Pin1)转染入EC1细胞,经G418加压筛选稳定表达Pin1小干扰RNA的细胞株,用免疫印迹法检测细胞中Pin1的表达,确定筛选细胞系的正确性.通过MTT实验以及流式细胞仪检测Pin1抑制对食管癌细胞增殖、凋亡的影响.结果:Western blot检测结果显示,Pinl蛋白表达被成功抑制,建立了稳定表达Pin1小干扰RNA的细胞株(shPin1).与正常EC1细胞比较,MTT实验和流式细胞术实验结果表明基因沉默Pin1抑制食管癌细胞增殖(抑制率为51.8%),诱导细胞凋亡(凋亡率为46.39%):并增加了食管癌细胞EC1对顺铂的敏感性,抑制食管癌细胞增殖以及诱导细胞凋亡的能力均有所增强,抑制率从23.5%上升到61.0%,凋亡率从26.10%上升到58.95%.结论:稳定干扰Pin1食管癌细胞系的建立为进一步研究Pin1在食管癌中的作用提供了研究平台:基因沉默Pin1增加了食管癌细胞对顺铂的敏感性.     

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。     

TGF-β1反义寡核苷酸对食管鳞癌细胞EC9706增殖及凋亡的影响

目的:探讨转染TGF-β1反义寡核苷酸(TGFβ1-ASODN) 对食管鳞癌细胞EC9706 增殖及凋亡的影响. 方法:将化学合成的TGF-β1-ASODN 转染食管鳞癌细胞EC9706,采用RT-PCR 和流式细胞术检测转染效率;观察TGF-β1-ASODN 转染后细胞形态学的改变;采用MTT 和流式细胞术检测TGF-β1-ASODN 转染后对细胞增殖及凋亡的影响. 结果:转染TGF -β1-ASODN 可有效抑制EC9706 细胞中TGF-β1的活性,其mRNA 及蛋白的表达均明显低于转染前的水平(0.25 ±0.07 vs 0.43±0.09;35.35% vs 41.38%,均P<0.05);TGF-β1-ASODN 可明显促进细胞增殖、抑制细胞凋亡,转染后细胞生长拥挤失去正常形态,细胞存活率高于转染前(109.4% vs 100.0%,P <0.05),G1期、S期细胞百分比低于转染前,G2期细胞百分比则高于转染前,细胞凋亡率低于转染前(62.9% vs 66.5%;21.3% vs 23.7%;14.8% vs 9.8%;0.69% vs 0.96%,均P<0.05). 结论:TGF -β1-ASODN 可高效特异地将TGF-β1基因沉默,并解除其抑制细胞增殖、阻滞细胞周期、促进细胞凋亡的作用.     

Inhibitory effect of ubiquitin-proteasome pathway on proliferation of esophageal carcinoma cells

AIM: To investigate the inhibitory effect of ubiquitin-proteasome pathway (UPP) on proliferation of esophageal carcinoma cells.METHODS: Esophageal carcinoma cell strain EC9706 was treated with MG-132 to inhibit its UPP specificity. Cell growth suppression was evaluated with 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. DNA synthesis was evaluated by ^3H-thymidine (^3H-TdR) incorporation. Morphologic changes of cells were observed under microscope. Activity of telomerase was examined by telomeric repeat amplification protocol (TRAP) of PCRELISA. Cell cycle and apoptosis were detected by flow cytometry (FCM). DNA fragment analysis was used to confirm the presence of apoptosis. Expression of p27^kip1 was detected by immunocytochemical technique. RESULTS: After exposed to MG-132, the growth and value of ^3H-TdR incorporation of EC9706 cells were obviously inhibited. Cells became round, small and exfoliative under microscope. TRAP PCR-ELISA showed that light absorption of cells gradually decreased after exposed to 5 μmol/L of MG-132 for 24, 48, 72 and 96 h (P&lt;0.01). The percentage of cells at G0/G1 phase was increased and that at S and G2/M was decreased (P&lt;0.01). The rate of apoptotic cells treated with 5 μmol/L of MG-132 for 48 and 96 h was 31.7% and 66.4%, respectively. Agarose electrophoresis showed marked ladders. In addition, the positive signals of p27^kip1 were located in cytoplasm and nuclei in MG-132 group in contrast to cytoplasm staining in control group. CONCLUSION: MG-132 can obviously inhibit proliferation of EC9706 cells and induce apoptosis. The mechanisms include upregulation of p27^kip1 expression, G1 arrest and depression of telomerase activity. The results indicate that inhibiting UPP is a novel strategy for esophageal carcinoma therapy.     

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.     

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.     

Effect of miR-451 on the Biological Behavior of the Esophageal Carcinoma Cell Line EC9706

Background

MicroRNAs play important roles in coordinating a variety of cellular processes. Abnormal expression of miRNAs has been linked to several cancers. However, the functional role of miR-451 in esophageal squamous cell carcinoma remains unclear.

Aims

The present study explored the effects of miR-451 on the biological behavior of the esophageal carcinoma cell line EC9706.

Methods

Synthetic miR-451 mimics were transfected into EC9706 cells using Lipofectamine? 2000. The expression of miR-451 was analyzed by RT–PCR and the expressions of Bcl-2, AKT and phosphorylated AKT were analyzed by Western blotting. The MTT assay, soft agar colony formation assay, transwell assay and FACS were used to assess the effect of miR-451 on EC9706 cell proliferation, invasion, metastasis and apoptosis. Tumor growth was assessed by subcutaneous inoculation of cells into BALB/c nude mice.

Results

In comparison to the controls, a significant increase in the expression of miR-451 was associated with significantly decreased expressions of Bcl-2, AKT and p-AKT, and a significant increase in the apoptosis rate. The number of cell clones was significantly decreased by miR-451 expression, which also caused the inhibition of cell proliferation. The average number of cells penetrating the matrigel was significantly lower than the controls. Injection of miR-451 inhibited tumor growth in a xenograft model.

Conclusions

Upregulated expression of miR-451 induced apoptosis and suppressed cell proliferation, invasion and metastasis in the esophageal carcinoma cell line EC9706. In addition, injection of miR-451 inhibited tumor growth in a xenograft model of esophageal cancer.     

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.     

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.     

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-...     

Resveratrol induces apoptosis in human esophageal carcinoma cells

AIM: To investigate the apoptosis in esophageal cancer cells induced by resveratrol, and the relation between this apoptosis and expression of Bcl-2 and Bax. METHODS: In in vitro experiments, MTT assay was used to determine the cell growth inhibitory rate. Transmission electron microscope and TUNEL staining method were used to quantitatively and qualitively detect the apoptosis status of esophageal cancer cell line EC-9706 before and after the resveratrol treatment. Immunohistochemical staining was used to detect the expression of apoptosis-regulated gene Bcl-2 and Bax. RESULTS: Resveratrol inhibited the growth of esophageal cancer cell line EC-9706 in a dose-and time-dependent manner. Resveratrol induced EC-9706 cells to undergo apoptosis with typically apoptotic characteristics, including morphological changes of chromatin condensation, chromatin crescent formation, nucleus fragmentation and apoptotic body formation. TUNEL assay showed that after the treatment of EC-9706 cells with resveratrol (10 mmol/L) for 24 to 96 hours, the AIs were apparently increased with treated time (P<0.05). Immunohistochemical staining showed that after the treatment of EC-9706 cells with resveratrol (10 mmol/L) for 24 to 96 hours, the PRs of Bcl-2 proteins were apparently reduced with treated time (P<0.05) and the PRs of Bax proteins were apparently increased with treated time (P<0.05). CONCLUSION: Resveratrol is able to induce the apoptosis in esophageal cancer. This apoptosis may be mediated by down-regulating the apoptosis-regulated gene Bcl-2 and up-regulating the expression of apoptosis-regulated gene bax.