青藤碱诱导肺癌NCI-H460细胞凋亡及其机制的实验研究

目的：探究青藤碱（SIN）诱导肺癌NCI-H460细胞凋亡的作用机制。方法：四甲基偶氮唑蓝（MTT）法测定SIN对肺癌NCI-H460细胞生长的影响;Western blot测定Bcl-2,Bax蛋白的表达;用SIN、PI3K/Akt和MAPK/ERK信号通路抑制剂干预NCI-H460细胞,流式细胞术检测细胞的凋亡率。结果：SIN对肺癌NCI-H460细胞生长有抑制作用,呈时间、浓度依赖性;SIN可以使NCI-H460细胞Bcl-2表达减低,Bax增强;SIN与PI3K/Akt和MAPK/ERK信号通路抑制剂联用后可协同增加NCI-H460细胞凋亡（P〈0.05）。结论：SIN可以抑制肺癌NCI-H460细胞的生长,能改变其Bax,Bcl-2蛋白的表达,与PI3K/Akt和MAPK/ERK信号通路抑制剂联用可协同发挥促进肺癌细胞凋亡作用,可望成为新的肺癌治疗药物。     

青藤碱诱导肺癌NCI-H460细胞凋亡及其机制的实验研究

目的:探究青藤碱(SIN)诱导肺癌NCI-H460细胞凋亡的作用机制。方法:四甲基偶氮唑蓝(MTT)法测定SIN对肺癌NCI-H460细胞生长的影响;Western blot测定Bcl-2,Bax蛋白的表达;用SIN、PI3K/Akt和MAPK/ERK信号通路抑制剂干预NCI-H460细胞,流式细胞术检测细胞的凋亡率。结果:SIN对肺癌NCI-H460细胞生长有抑制作用,呈时间、浓度依赖性;SIN可以使NCI-H460细胞Bcl-2表达减低,Bax增强;SIN与PI3K/Akt和MAPK/ERK信号通路抑制剂联用后可协同增加NCI-H460细胞凋亡(P<0.05)。结论:SIN可以抑制肺癌NCI-H460细胞的生长,能改变其Bax,Bcl-2蛋白的表达,与PI3K/Akt和MAPK/ERK信号通路抑制剂联用可协同发挥促进肺癌细胞凋亡作用,可望成为新的肺癌治疗药物。     

青藤碱通过线粒体途径诱导肺癌NCI-H460细胞凋亡的初步研究

目的:研究青藤碱(sinomenine,SIN)对人肺癌NCI-H460细胞株的生长抑制及诱导凋亡作用及其机制。方法:四甲基偶氮噻蓝（MTT）法检测细胞增殖的抑制作用,流式细胞仪AnnexinV/PI双染法检测细胞凋亡,TdT酶介导的dUTP缺口末端标记（TUNNEL）方法观察细胞的凋亡,罗丹明123(Rhodamine123)染色流式细胞仪检测线粒体膜电位(ΔΨm)。结果:SIN对NCI-H460细胞株生长具有抑制作用并诱导凋亡。AnnexinV/PI双染检测细胞的凋亡可见随SIN浓度增加,细胞凋亡增加呈浓度依赖性。TUNNEL阳性的凋亡细胞呈棕黄色,细胞核片段化改变。罗丹明染色检测线粒体膜电位的结果提示在SIN作用于NCI-H460细胞48h后,线粒体膜电位下降,SIN浓度越高,膜电位下降越显著。结论:SIN具有明显的细胞毒作用,能诱导NCI-H460细胞凋亡,SIN通过线粒体途径诱导NCI-H460细胞凋亡。     

三氧化二砷对人肺癌细胞株增殖和凋亡的影响

目的 探讨三氧化二砷（Ａｓ２Ｏ３）对人肺癌的潜在性治疗作用及可能的机制。方法 选用人肺癌细胞株ＧＬＣ－８３,运用细胞培养法、ＭＴＴ法、流式细胞术（ＦＣＭ）检测细胞生长曲线、细胞增殖、细胞周期和细胞凋亡。结果 三氧化二砷可明显抑制ＧＬＣ－８２细胞的增殖,其抑制作用具有时－效和量－效关系。当４．０μｍｏｌ／Ｌ三氧化二砷处理ＧＬＣ－８２细胞９６小时,增殖抑制率达８１．０５％,ＦＣＭ检测肿瘤细胞ＤＮＡ含量,观察到三氧化二砷ＧＬＣ－８２细胞周期阻滞于Ｇ２／Ｍ期,细胞周期进程变慢,同时出现剂量依赖性Ｇ１峰。结论 三氧化二砷能有效地抑制人肺癌细胞株ＧＬＣ－８２的增殖,其可能的机制与三氧化二砷使细胞阻滞于Ｇ２／Ｍ期并诱导其调亡有关。     

TRAIL对人肺腺癌细胞株Calu-3增殖和凋亡的影响

[目的]研究肿瘤坏死因子相关凋亡诱导配体（tumor necrosis factor-related apoptosis-inducing ligand,TRAIL）对人肺腺癌细胞株Calu-3增殖和凋亡的影响。[方法]用不同浓度TRAIL分不同时间段干预Calu-3细胞,MTT法检测细胞增殖抑制率,流式细胞仪检测细胞凋亡率。[结果]Calu-3细胞生长被TRAIL抑制,具有浓度和时间依赖性。TRAIL能诱导Calu-3细胞凋亡。[结论]TRAIL在体外具有抑制Calu-3细胞增殖,促使Calu-3细胞凋亡的作用。     

粉防已碱对人卵巢癌细胞株A2780增殖与凋亡的影响

目的：通过观察粉防已碱对人卵巢癌A2780细胞增殖与凋亡的影响，初步探讨粉防已碱对卵巢癌的体外抗肿瘤效应。方法：采用MTT试验观察粉防已碱对A2780细胞的增殖抑制效应，利用细胞DNA琼脂糖凝胶电泳检测粉防已碱诱导肿瘤细胞凋亡的作用，通过流式细胞术观察粉防已碱对人卵巢癌A2780细胞周期的影响以及诱导凋亡的作用，以免疫印迹检测粉防已碱对p53、p21及Bax表达水平的影响。结果：MTT试验显示粉防已碱对人卵巢癌A2780细胞增殖有抑制作用，其抑制效应具有时间及浓度依赖的特点，琼脂糖凝胶电泳及流式细胞术表明粉防已碱可诱导A2780细胞凋亡，并引起G0／G1期阻滞，免疫印迹检测显示粉防已碱上调p53、p21及Bax蛋白表达。结论：粉防已碱对人卵巢癌A2780细胞增殖的抑制效应具有时间及浓度依赖性，并可诱导细胞凋亡，其抗肿瘤效应可能与上调p53、p21及Bax蛋白表达有关。     

青藤碱对肠癌细胞的抑制作用

目的:观察青藤碱对肠癌细胞的抑制作用。方法:选取HCT116细胞分3组,分别用DMSO（对照组）、20 μmol/L和40 μmol/L的青藤碱以及6 μmol/L的5氟尿嘧啶（5-FU）处理细胞。MTT检测不同浓度药物对HCT116细胞增殖的影响。PI染色技术和JC-1染色分别检测药物对细胞周期和凋亡的作用。通过Western blot检测青藤碱对HCT116细胞中Cyclin D1和bcl-2的影响。Transwell实验检测青藤碱对HCT116细胞迁移的影响。通过Western blot检测青藤碱对HCT116细胞中MMP2的影响。结果:与DMSO相比,20 μmol/L和40 μmol/L的青藤碱以及6 μmol/L的5-FU作用于HCT116细胞24 h后对细胞的抑制率分别为:(33.16±6.01)%、(47.48±2.32)%和(62.31±3.26)%。青藤碱抑制G1-S期转化,促进细胞凋亡。Western blot结果显示,青藤碱抑制Cyclin D1、bcl-2和MMP2在HCT116细胞中的表达。结论:青藤碱抑制HCT116细胞的生长和迁移。     

高能电磁脉冲诱导肺癌细胞株GLC-82凋亡的研究

背景与目的:电磁脉冲(electromagneticpulse,EMP)辐射已用于饮食行业的灭菌,且较2450MHz连续微波辐射消毒更加有效。本研究探讨高能电磁脉冲对肺癌细胞GLC-82凋亡的影响,以发现治疗肿瘤的新手段。方法:以场强为6×104V/m的EMP2min内辐照5次,然后采用细胞计数、MTT、流式细胞术及SP免疫组化法检测bcl-2和p53蛋白的表达,并对表达强度用CMIAS-Ⅱ图像分析仪在放大400倍条件下进行分析,通过上述方法观察EMP对肺癌细胞GLC-82的损伤作用,所有数据经SPSS8.0软件进行分析。结果:EMP可明显抑制肺癌细胞GLC-82的增殖与活力。照射后细胞的MTT光吸收值(A570)与对照组相比,在辐照后0h,1h和6h明显降低。流式细胞术证明,GLC-82细胞在辐照后6h发生明显的凋亡,凋亡率达13.38%。免疫组化的图像分析表明,照射后GLC-82细胞有不同程度的bcl-2蛋白表达的下调及p53蛋白表达的上调。结论:EMP可诱导肺癌细胞GLC-82的凋亡。bcl-2及p53蛋白参与了GLC-82细胞的凋亡过程。     

康莱特注射液对人胰腺癌细胞株PANC-1增殖和凋亡影响的实验研究

目的：通过康莱特注射液作用于人胰腺癌细胞株 PANC-1,观察其对 PANC-1细胞增殖和凋亡的影响,并进一步探讨其作用机制。方法倒置显微镜及电镜观察80μL·mL -1康莱特注射液作用 PANC-1细胞72 h 后细胞形态改变;采用 MTT 比色法检测不同浓度（10、20、40、60、80、100μL·mL -1）康莱特注射液对PANC-1细胞生长增殖抑制作用的影响;同时采用流式细胞术检测不同浓度（10、20、40、60、80、100μL·mL -1）康莱特注射液对 PANC-1细胞周期的影响。结果细胞形态学检查发现80μL·mL -1康莱特注射液处理 PANC-1细胞72 h 后细胞生长稀疏,细胞质透亮度下降,线粒体等细胞器功能障碍,细胞核功能上受到一定的抑制;不同浓度康莱特注射液作用于 PANC-1细胞株不同时段（24、48、72 h）后肿瘤细胞生长受到了一定的抑制且呈现时间和剂量依赖性;不同浓度康莱特注射液处理 PANC-1胰腺癌细胞72 h 后 PANC-1细胞周期均阻滞于 G2/ M 期,康莱特注射液可剂量依赖性的诱导 PANC-1细胞凋亡。结论康莱特注射液能够有效抑制人胰腺癌细胞株 PANC-1在体外的生长,其机制可能是通过抑制细胞增殖,促进肿瘤细胞的凋亡而实现,有望成为胰腺癌的有效治疗药物。     

Survivin反义寡核苷酸协同Taxol诱导肺癌细胞株凋亡

[目的]研究Survivin反义寡核苷酸(antisense oligonucleotide,ASODN)单独或联合Taxol对肺癌细胞株Survivin mRNA和蛋白表达,细胞凋亡,生长抑制率的影响.[方法]Survivin ASODN经脂质体介导转染人小细胞肺癌细胞株NCI-H446,用RT-PCR法、Western blot法检测Survivin表达;Survivin ASODN单独、联合Taxol作用NCI-H446细胞后,用MTT法检测细胞生长抑制率,台盼兰拒染实验检测细胞死亡率,流式细胞仪检测细胞凋亡并计算两药相互作用指数(CDI).[结果]Survivin ASODN转染NCI-H446细胞后,Survivin mRNA表达和蛋白表达明显下调,其中SurvivinASODN 500nM作用72h时Survivin mRNA抑制率达62.72%,效果最佳;Survivin ASODN单独或联合Taxol作用NCI-H446细胞后发现Survivin ASODN联合Taxol作用的效果明显优于两药单独应用(P＜0.01).其联用时细胞凋亡率达73.3%,而单用时分别为43.6%和23.8%.其联用时细胞生长抑制率达80.1%,而单用时抑制率分别为50.4%和30.5%(P均＜0.01).两药联用组细胞死亡率达69.9%,高于两药单用时的41.4%和24.8%(P均＜0.01);CDI值为0.43,表明两药具有显著协同作用.[结论]Survivin ASODN能够抑制肺癌细胞株Survivin mRNA和蛋白表达并诱导肺癌细胞凋亡;Survivin ASODN能够增加Taxol的敏感性.     

Effect of inducible FHIT and p53 expression in the Calu-1 lung cancer cell line

Loss of FHIT expression and p53 mutations are critical events in the early stages of lung carcinogenesis. The restoration of Fhit function in FHIT-negative cancer cells has been reported to cause tumour suppression by inhibition of cell proliferation and/or activation of apoptotic pathways. However, the studies designed to elucidate the biological role of Fhit and its potential interaction with p53 have produced conflicting results. We investigated here the effects of the simultaneous restoration of FHIT and p53 in Calu-1 cells by using a hormone-inducible gene expression system. We demonstrate that the restoration of FHIT expression reinforces the anti-proliferative effect associated with the simultaneous replacement of p53. Indeed, a more pronounced inhibition of cell proliferation associated with an earlier and higher induction of p21(waf1) mRNA and protein expression was observed in Fhit/p53-expressing cells compared with cells expressing p53 alone. This effect was not due to Fhit-mediated up-regulation of p53 expression; in fact p53 protein was expressed at the same level in both FHIT-positive and FHIT-negative cell clones. Consistent with this result, Fhit did not affect the expression of MDM2, a protein known to interact directly with p53 and target p53 for proteolytic degradation, thus down-regulating its activity.     

利用PCR-SSP法研究肺腺癌细胞系A549、Calu-6的HLA-ABDR等位基因

背景和目的已有的研究表明人类白细胞抗原（HLA）在抗原呈递及T细胞识别抗原的过程中起关键作用，此外还与肿瘤细胞的免疫杀伤及免疫逃避有着密切的关系。本研究探讨了人肺腺癌细胞系A549、Calu-6中HLA-A、HLA-B、HLA-DR等位基因的存在状况。方法分离A549、Calu-6细胞DNA，分别行PCR-SSP法扩增、电泳后紫外透射扫描，根据反应格局表对HLA-A、HLA-B、HLA-DR进行判定。结果A549与Calu-6细胞中HLA-A、HLA-B基因较杂合子均有缺失，而HLA-DR基因无缺失。A549细胞HLA-ABDR的基因分型为HLA-A30、HLA-B44、HLA-DRT／HLA-DR53。Calu-6细胞HLA-ABDR的基因分型为HLA-A01、HLA-B08、HLA-DR17／HLA-DR52。结论肺腺癌中存在HLA-Ⅰ和HLA-Ⅱ基因。HLA-Ⅰ基因可能在肿瘤细胞传代过程中发生选择性丢失，而HLA-DR基因完整保留。检测肿瘤HLA对了解其免疫学行为及建立肿瘤特异性杀伤淋巴细胞（CTL）模型具有重要意义。     

Rab1A对NSCLC细胞迁移和JAK1磷酸化的影响

目的:观察Rab1A(Ras-related protein Rab-1A)对非小细胞肺癌(non-small cell lung cancer,NSCLC)细胞系迁移的影响及其分子机制.方法:应用siRNA干扰Rab1A基因表达;应用RTCA(real-time cell analysis)法分析干扰Rab1A基因表达对NSCLC细胞迁移速率的影响;应用免疫印迹观察干扰Rab1A基因表达对JAK1(Janus Kinase 1)磷酸化水平的影响.结果:与阴性对照组相比,Rab1A siRNA转染组NSCLC细胞系的Rab1A蛋白表达水平显著下调(P＜0.01);干扰Rab1A基因表达抑制NSCLC细胞迁移(P＜0.01);干扰Rab1A基因表达可下调NSCLC细胞迁移相关蛋白JAK1磷酸化水平(P＜0.01).结论:Rab1A通过调节JAK1磷酸化水平影响NSCLC细胞迁移.     

吲哚美辛对结肠癌细胞中细胞周期蛋白的影响

目的体外观察吲哚美辛对含突变型p53的SW480细胞及经野生型p53转染的结肠癌细胞株SW480(wtp53/SW480)的影响,探讨吲哚美辛抗结肠癌作用的分子机制.方法不同浓度的吲哚美辛作用于细胞株,采用Western斑点免疫印迹方法,分别检测SW480细胞及wtp53/SW480细胞中CDK2、CDK4和p21WAF1/PIC1蛋白的表达水平.结果吲哚美辛作用于wtp53/SW480细胞24 h后,其CDK2、CDK4蛋白表达水平随吲哚美辛浓度的增加而逐渐下调,呈浓度依赖性,以600μmol/L时抑制作用最强;而p21WAF1/PIC1蛋白表达水平上调,其表达水平随着一定范围内吲哚美辛浓度的增加而逐渐上调,以400μmol/L吲哚美辛时作用最强,600μmol/L时回到基础水平.在未经转染的SW480细胞中CDK2、CDK4和p21WAF1/PIC1蛋白表达没有发生明显改变.结论吲哚美辛抗结肠癌作用部分分子机制可能是通过下调CDK2、CDK4蛋白的表达和上调p21WAF1/PIC1蛋白来实现且存在p53-p21WAF1/CIP1依赖途径.     

甘露糖对6个人非小细胞肺癌细胞系放射敏感性影响

目的 探讨甘露糖对6个人非小细胞肺癌细胞系放射敏感性的影响及其可能机制。方法 采用Western blot检测磷酸甘露糖异构酶在6个肺癌细胞系中的表达。利用MTT法观察甘露糖对肺癌细胞系的增殖抑制作用;分别给予对照组、甘露糖组0、2、4、6、8、10Gy照射,采用平板克隆形成实验检测甘露糖对6个肺癌细胞放射敏感性的影响;流式细胞术检测对照组、甘露糖组、照射组及联合组细胞的凋亡情况。结果 6个肺癌细胞系中磷酸甘露糖异构酶表达量各不相同,其中A549细胞表达量最高,H460细胞表达量最低。11.1mmol/L甘露糖对A549、H460细胞系抑制作用相同,随着甘露糖浓度增加,对H460细胞系抑制作用更显著。采用11.1mmol/L的甘露糖可明显增加H460细胞系放射敏感性及细胞凋亡率,而对A549细胞系放射敏感性和凋亡率影响不大。结论 在磷酸甘露糖异构酶高表达的6个肺癌细胞系中,甘露糖可增强部分肿瘤细胞的放射敏感性。     

Endogenous receptor-bound urokinase mediates tissue invasion of the human lung carcinoma cell lines A549 and Calu-1.

Macrophage colony-stimulating factor (CSF-1) increases the tissue invasive potential of the CSF-1 receptor-bearing lung carcinoma cell lines A549 and Calu-1 by increasing the number of endogenously bound urokinase-type plasminogen activators (u-PA)s on these cells. CSF-1, at concentrations which optimize invasion of A549 and Calu-1 cells into human amnion membranes (250 ng/ml), maximally augments the number of u-PA receptors occupied by endogenously produced urokinase. Preincubation of A549 and Calu-1 cells with the anti-u-PA monoclonal antibody MPW5UK (25 micrograms/ml) or with a 20- to 40-fold stoichiometric excess of fluid phase type 2 plasminogen activator inhibitor abrogates invasiveness, indicating that functionally active cell surface u-PA is essential for tissue invasion. In contrast, fluid phase type 1 plasminogen activator inhibitor (PAI-1, 5-15 units/ml) does not inhibit invasiveness unless preincubated with the amnion membranes. Inhibition of invasion by PAI-1 is abolished by presaturating the amnion membranes with antiitronectin monoclonal antibody (10 micrograms/ml) which prevents binding of PAI-1 to tissue-associated vitronectin. Binding of PAI-1 to tissue vitronectin is therefore a prerequisite for its inhibitory action. Thus, endogenously receptor-bound u-PA is the primary protease mediating CSF-1-induced tissue invasiveness of the lung carcinoma cell lines A549 and Calu-1.     

Effects of gemcitabine on cell proliferation and apoptosis in non-small-cell lung cancer (NSCLC) cell lines

We evaluated the antiproliferative and the proapoptotic ability of gemcitabine in three non-small-cell lung cancer (NSCLC) cell lines. NCI-H292 (mucoepidermoid carcinoma), NCI-CorL23 (large-cell carcinoma) and NCI-Colo699 (adenocarcinoma) cells were cultured with and without 0.5, 0.05 and 0.005 μM gemcitabine for 24, 48 and 72 h, respectively. Gemcitabine exerted a stronger and earlier antiproliferative and proapoptotic effect on H292 cells than on CorL23 or Colo699 cells. Fas receptor expression was increased in all three cell lines and was higher in Colo699 than in CorL23 cells. The incubation of NSCLC with anti-Fas agonistic monoclonal antibody (CH11) induced cell apoptosis in H292 cells, demonstrating that the Fas receptor was functionally active. Finally, gemcitabine and CH-11 exerted a synergistic effect on cell apoptosis in H292 cells. This study demonstrates that gemcitabine induces apoptosis in NSCLC and that this effect might be exerted by modulating functionally active Fas expression, and these effects of gemcitabine were stronger in H292 cells than in either CorL23 or Colo699 cells. Received: 24 March 1999 / Accepted: 25 July 2000     

JNJ-7706621对人乳腺癌细胞周期及凋亡的影响

  目的   探讨周期素依赖性蛋白激酶（cyclin-dependent kinases,CDKs）抑制剂JNJ-7706621对人乳腺癌细胞周期及凋亡的影响。  方法  常规培养乳腺癌T47D、MD-MB-231细胞,MTT法检测不同浓度JNJ-7706621（0、1、2、4 μM）对乳腺癌细胞增殖的影响;流式细胞术检测JNJ-7706621对细胞周期的影响,Annexin Ⅴ-FITC/PI双染法检测JNJ-7706621对细胞凋亡的影响;West. ern blot检测JNJ-7706621对凋亡及周期相关蛋白表达的影响。  结果  JNJ-7706621能够抑制乳腺癌T47D、MDA-MB-231细胞增殖,具有浓度和时间依赖性;流式细胞术显示,JNJ-7706621可将T47D、MDA-MB-231细胞的周期阻滞于G2/M期,具有浓度依赖性,与对照组相比差异有统计学意义（P < 0.05）;Annexin Ⅴ-FITC/PI双染法示随着JNJ-7706621浓度增加或作用时间的延长,T47D、MDA-MB-231细胞凋亡所占比例逐渐增加,与对照组相比,差异有统计学意义（P < 0.05）;Western blot结果显示,随JNJ-7706621浓度增加,Bcl-2的表达明显下调,Caspase3、PARP的剪切明显增高,而p53的表达无明显变化;周期相关蛋白CDK1的表达无明显变化;CDK1在Thr161位点的磷酸化水平降低,而在Tyr15位点的磷酸化水平增高;  结论   在体外条件下,JNJ-7706621可通过阻滞细胞周期与诱导细胞发生凋亡的方式,有效抑制乳腺癌细胞增殖,可能与抑制CDK1在Thr161位点的磷酸化水平有关。      

Effects of SASH1 on lung cancer cell proliferation, apoptosis, and invasion in vitro

The purposes of this study were to investigate the effects of the SASH1gene on the growth, proliferation, apoptosis, invasiveness, and metastatic potential of lung cancer cells and explore the potential use of SASH1 for the treatment of human lung cancer. The SASH1 gene was cloned into the pcDNA3.1 eukaryotic expression vector, and SASH1 shRNA were designed and constructed. The resulting constructs were transfected into A549 human lung cancer cells, and the changes in the relevant biological characteristics of the cells overexpressing SASH1 and cells with downregulated expression of SASH1 were analyzed using the MTT assay, transwell invasion assay, and flow cytometry. The effects of the SASH1 gene on the expression of cyclin D1, Bcl-2, and MMP-2/9 were also concurrently examined. In the A549 cells from the pcDNA3.1-SASH1 transfected group, cell viability, proliferation, and migration were significantly reduced compared to the control cells (p?=?0.039, p?=?0.013), and a cell cycle arrest in G1 was observed. The A549 cells transfected with the SASH1 shRNA demonstrated significantly higher cell viabilities, proliferation, and migration compared to the control cells (p?=?0.012, p?=?0.045). Additionally, the percentage of A549 cells undergoing apoptosis was significantly higher in the pcDNA3.1-SASH1 transfected cells and significantly lower in the SASH1 shRNA transfected cells compared to the control cells (p?=?0.010, p?=?0.000). The cyclin D1, Bcl-2, and MMP-9/2 protein expression levels were significantly lower in the pcDNA3.1-SASH1-transfected cells and were significantly higher in the SASH1 shRNA-transfected cells than that in the control cells. The SASH1 gene may inhibit A549 cell growth and proliferation as well as promote cellular apoptosis. The overexpression of the SASH1 gene may also be related to the decreased migration of A549 human lung cancer cells.