二甲基亚砜(DMSO)对人肝癌HepG2 细胞的诱导分化作用的实验研究

目的:探讨二甲基亚砜(DMSO)对人肝癌HepG2细胞的诱导分化作用。方法:体外培养人肝癌HepG2细胞,用DMSO干预细胞,MTT法检测药物对细胞增殖活力的影响;倒置相差显微镜和瑞氏-姬姆萨染色观察细胞形态学的变化;放射免疫法检测细胞甲胎蛋白（AFP）和清蛋白(ALB)的分泌量;酶促反应试剂盒检测细胞中γ-谷胺酰转肽酶（γ-GT）、碱性磷酸酶（ALP）的活性。结果:用DMSO处理HepG2细胞72h后,能显著抑制细胞的增殖（P＜0.05）;细胞的形态向成熟细胞分化;细胞AFP的分泌量和γ-GT酶的活性明显降低,ALP活性和ALB含量则显著升高（P＜0.05）。结论:DMSO具有诱导人肝癌HepG2向正常细胞分化的作用并抑制细胞增殖。     

东亚钳蝎毒抗癌多肽对人肿瘤细胞系和动物移植瘤的作用

目的研究东亚钳蝎毒抗癌多肽(APBMV)对人早幼粒白血病细胞系HL-60和人肝癌细胞系SMMC-7721及对小鼠肝癌H22移植瘤的作用.方法体外应用MTT法、生长抑制实验和集落形成实验,观察APBMV对HL-60、SMMC-7721及H22瘤细胞的作用;体内实验采用小鼠H22实体瘤模型,检测肿瘤生长抑制率(IR)、白细胞计数(WBC)和脾脏指数(SI),观察APBMV对H22带瘤小鼠的影响.结果APBMV 对HL-60和SMMC-7721细胞均具较强的毒性作用,其IC50值分别为10.74 μg/ml和11.33 μg/ml; APBMV可显著抑制两种细胞的生长,剂量效应关系明显,HL-60和SMMC-7721细胞24h、48h和96h的IC50值分别为19.41 μg/ml、9.90 μg/ml、11.41 μg/ml和l5.87 μg/ml、13.05 μg/ml、8.70 μg/ml;APBMV浓度>8 μg/ml时,可明显抑制SMMC-7721细胞的集落形成(P<0.01),IC50为10.83 μg/ml.H22细胞经APBMV处理后,代谢MTT的能力明显低于对照组,但剂量效应关系不明显(P>0.05).APBMV能显著抑制H22带瘤小鼠的肿瘤生长,IR最高达40.30%( P<0.01), 小鼠WBC和SI无明显变化或略高于对照组,而5-Fu组小鼠WBC和SI均明显下降(P<0.01).结论APBMV是东亚钳蝎蝎毒中有效低毒的抗肿瘤成分,对HL-60、SMMC-7721细胞和小鼠H22肿瘤有显著抑制作用.     

沙利度胺对人肝癌细胞株SMMC-7721体外生长的抑制作用

目的 研究沙利度胺对人肝癌细胞株SMMC-7721体外生长的抑制作用及其可能的机制.方法 将不同浓度的沙利度胺作用于人肝癌细胞株SMMC-7721,采用四甲摹偶氮唑蓝(MTT)法检测沙利度胺对SMMC-7721细胞的增殖抑制作用.将SMMC-7721细胞培养至对数生长期,采用DNA琼脂糖凝胶电泳、荧光显微镜观察、流式细胞仪检测等方法 观察沙利度胺处理后SMMC-7721细胞的凋亡梯度、形态学变化和凋亡率,并对凋亡调控蛋白caspase-3的表达进行测定.采用酶联免疫吸附(ELISA)法测定不同浓度的沙利度胺处理后SMMC-7721细胞表达血管内皮生长因子(VEGF)的变化.结果 沙利度胺的浓度从3.125μg/ml增至200μg/ml时,其对SMMC-7721细胞的增殖抑制率从11.7%增至34.2%;当沙利度胺的浓度>25 μg/ml时,其对SMMC-7721细胞的增殖抑制作用明显强于空白对照组(P<0.05).200 μg/ml的沙利度胺处理SMMC-7721细胞24 h后,行琼脂糖凝胶电泳,可见到DNA梯形条带;48 h后梯形条带更明显,并且在荧光显微镜下可见SMMC-7721细胞出现核固缩和核裂解现象.200μg/ml的沙利度胺处理SMMC-7721细胞12、24、48和72 h时,碘化丙啶(PI)法检测SMMC-7721细胞的凋亡率分别为3.1%±0.5%、8.4%±1.3%、19.4%±3.5%和25.8%±2.1%,24 h起的凋亡率均明显高于空白对照组SMMC-7721细胞48 h的自然凋亡率(1.6%±0.6%,均P<0.05).50、100和200μg/ml的沙利度胺处理SMMC-7721细胞48 h时,Annexin V-FITC/PI双标法检测SMMC-7721细胞的凋亡率分别为8.7%±1.2%、16.8%±2.5%和25.4%±4.5%,均明显高于空白对照组SMMC-7721细胞48 h的自然凋亡率(2.1%±0.5%,均P<0.05).随着沙利度胺浓度的增加,表达caspase-3蛋白的SMMC-7721细胞数量不断增加,而SMMC-7721细胞中VEGF的含量却逐渐下降.结论 沙利度胺可能通过诱导肝癌细胞的凋亡、抑制肿瘤血管的生成而发挥双重抗肿瘤生长的作用.     

羟基喜树碱诱导Bel-7402人肝癌细胞分化的研究

目的　探讨羟基喜树碱诱导Bel -740 2人肝癌细胞分化作用 ,为肝癌的分化治疗提供可借鉴的资料。方法　选用反映肝细胞恶变的甲胎蛋白 (AFP)的分泌量、γ -谷氨酰转肽酶 (γ -GT)和醛缩酶 (ALD) ,反映肝癌细胞分化的酶学指标酪氨酸 -α -酮戊二酸转氨酶 (TAT) ,鸟氨酸氨基甲酰转移酶 (OCT)和碱性磷酸酶 (ALP)作为观察肝癌细胞恶性表型逆转的指标。结果　Bel -740 2人肝癌细胞经 0 0 5mg/ml羟基喜树碱处理后 ,AFP分泌量明显低于对照组 ,γ -GT和ALD活力也明显低于对照组 ;相反 ,OCT、TAT和ALP的活力则明显高于对照组 ,差异均具有显著性 (P <0 0 5 )和 (P <0 0 1)。结论　证明羟基喜树碱是体外培养Bel -740 2人肝癌细胞有效的分化诱导剂     

雷公藤内酯醇下调P53基因甲基化抑制肝癌SMMC-7721细胞的增殖

目的:研究雷公藤内酯醇(triptolide,TP)对人肝癌SMMC-7721细胞增殖的影响以及对P53基因的去甲基化作用。方法:MTT法检测TP对SMMC-7721细胞增殖的影响,甲基特异性PCR检测TP对SMMC-7721细胞P53基因甲基化的影响,RT-PCR检测SMMC-7721细胞甲基转移酶DNMT1、DNMT3a、DNMT3bmRNA的表达,Western blotting检测SMMC-7721细胞中P53蛋白的表达。结果:TP剂量依赖性抑制SMMC-7721细胞的增殖(P<0.05),40 ng/ml时的抑制率达(73.5±3.02)%,其半数抑制浓度(IC50)约为20 ng/ml。TP显著抑制SMMC-7721细胞中DNMT1、DNMT3a、DNMT3bmRNA的表达(P<0.05,P<0.01);TP作用后P53基因的高甲基化被逆转,并呈剂量依赖性;TP可显著增强SMMC-7721细胞中P53蛋白的表达。结论:TP可通过抑制甲基转移酶使P53基因去甲基化,促进P53蛋白的表达,从而抑制SMMC-7721细胞的增殖。     

含甲胎蛋白肽段的重组腺病毒转染树突状细胞诱导细胞毒性T细胞对肝癌细胞的体外杀伤效应

目的 研究人外周血单核细胞来源的树突状细胞(DC)转染含甲胎蛋白(AFP,137-145)片段的重组腺相关病毒后所诱导的特异性T细胞对肝癌细胞株HepG2和SMMC-7721的体外杀伤作用.方法 抽取健康志愿者外周血,分离单核细胞,体外培养,使用含AFP片断的重组腺相关病毒转染未成熟DC,诱导特异性T细胞.检测体外培养的DC和细胞毒性T细胞(CTL)活性,应用四甲基偶氮唑蓝(MTT)法检测CTL对HepG2和SMMC-7721细胞的杀伤作用.结果 转染或未转染的体外培养的成熟DC高表达CD40、CD86和IL12,成熟DC诱导的CTL高表达IFNγ;修饰成熟后的DC后体外能诱导特异性CTL,该CTL在休外对肝癌细胞株HepG2和SMMC-7721均有杀伤作用.结论 重组腺相关病毒转染DC,不明显改变DC表型和刺激淋巴细胞增殖和分化功能,可诱导自体CTL增殖,含AFP(137～145)片断的腺相关病毒转染DC诱导自体CTL对肝癌细胞株HepG2和SMMC-7721细胞有明显杀伤作用,DC疫苗可以作为肝癌患者免疫治疗的有效补充.     

金花茶总黄酮体外抗肿瘤活性的实验研究

目的观察金花茶总黄酮对4种肿瘤细胞株体外增殖的作用。方法采用噻唑蓝染色法(MTT法)检测金花茶总黄酮在体外对人肝癌细胞株(SMMC-7721)、人高分化鼻咽癌细胞株(CNE-1)、人胃腺癌细胞株(SGC-7901)、人大细胞肺癌细胞株(H460)的增殖抑制率,并计算相应的半数生长抑制浓度(IC50)。结果金花茶总黄酮对SMMC-7721、CNE-1、SGC-7901、H460均有抑制作用(P<0.05),且呈一定的浓度依赖性,IC50分别为242.44μg/ml、313.79μg/ml、259.87μg/ml、385.87μg/ml。结论体外实验显示金花茶总黄酮有抗肿瘤活性。     

AFP对裸鼠肝癌移植瘤生长的促进作用及对血管形成相关因子的影响

目的:探讨AFP对肝癌移植瘤生长及血管生成调节因子表达的影响。方法:采用pEGFP-N1-AFP和pEGFP-N1质粒分别转染SMMC-7721细胞构建SMMC-7721/AFP和SMMC-7721/CON细胞,将裸鼠分为实验组和对照组,分别于裸鼠皮下接种SMMC-7721/AFP和SMMC-7721/CON,从而建立人肝癌移植瘤模型,动态观测裸鼠肿瘤体积和质量变化;取肿瘤组织用实时定量RT-PCR和Western blot检测组织中的HOXA7、eIF4E、VEGFA和FGF2表达。结果:构建SMMC-7721/AFP和SMMC-7721/CON细胞,并将其接种到裸鼠皮下成功建立肝癌移植瘤模型。与对照组比较,实验组移植瘤体积与质量显著增高,成瘤后第12天,实验组移植瘤体积和质量分别为（307.71±47.63）mm3和（20.243±0.411）g,差异均具有显著性（P=0.012,P=0.04）。实时定量RT-PCR结果显示AFP过表达提高了肝癌移植瘤细胞HOXA7、eIF4E和FGF2 mRNA表达水平,分别为2.488±1.155、23.828±2.465和4.407±1.164,与对照组相比增高程度具有显著性差异,但VEGFA mRNA表达未见显著增强。Western blot结果显示:SMMC-7721/AFP较SMMC-7721/CON细胞显著提高HOXA7蛋白表达水平,但对FGF2和VEGFA无显著影响。结论:AFP基因转染可明显促进裸鼠肝癌移植瘤的生长,该作用可能与其促进肿瘤血管形成因子在mRNA水平的调控有关。     

氯化镉和顺铂联合对人肝癌细胞增殖的抑制作用

背景与目的： 研究氯化镉和顺铂联合对人肝癌细胞SMMC-7721增殖的抑制作用。 材料与方法： 采用MTT法测定不同浓度氯化镉和顺铂对人肝癌细胞SMMC-7721增殖的抑制作用;应用两药相互作用指数进行联合作用分析。 结果： 0.56、1.12、2.25 μg/ml的氯化镉联合0.25、0.5、1.0 μg/ml的顺铂可协同抑制SMMC-7721增殖,且随着作用时间延长,协同抑制作用增强(P<0.05或 P<0.01)。 结论： 氯化镉与顺铂联合应用可以协同抑制人肝癌细胞SMMC-7721的增殖。     

Apoptosis in human hepatoma cell line SMMC-7721 induced by water-soluble macromolecular components of Artemisia capillaris Thunberg.

The aim of this study was to investigate the effect of water-soluble macromolecular components of Artemisia capillaris Thunberg (ACT) on human hepatoma cell line SMMC-7721 (SMMC-7721). The morphological changes of SMMC-7721 were observed under a light microscope and an electron microscope. Inhibition of proliferation was measured with a colorimetric MTT assay. It was discovered that ACT extract-treated cells exhibit morphological changes typical of apoptosis, including condensed chromatin and a reduction in volume. ACT extract at 25-200 microg/ml dose-dependently inhibited the proliferation of SMMC-7721. The 50% effective dose, evaluated on day 3 of exposure to the extract, was 64.52+/-3.53 microg/ml. Upon gel electrophoresis, the fragmented DNA showed a characteristic ladder pattern. Cell cycle analyses revealed that ACT induced cell cycle arrest at the G0/G1 phase.     

Survivin反义寡核苷酸对肝癌细胞增殖和凋亡的影响

目的：观察Survivin反义寡核苷酸对SMMC-7721细胞增殖、凋亡的影响.方法：设计合成特异性Survivin 反义寡核苷酸,转染肝癌SMMC-7721细胞,MTT法测定Survivin ASODN对细胞增殖抑制情况的影响,FCM法检测对细胞周期、凋亡及Survivin蛋白表达的影响.结果：Survivin ASODN可抑制SMMC-7721细胞的生长增殖,并呈浓度和时间依赖性.ASODN转染组可诱导SMMC-7721细胞凋亡（P＜0.01）,细胞周期阻滞于G2/M期（P＜0.05）.ASODN转染组Survivin蛋白表达水平显著降低（P＜0.01）.结论：Survivin ASODN能下调SMMC-7721细胞Survivin表达,并可抑制其增殖并诱导凋亡.     

The Effect of PEI-Mediated E1A on the Radiosensitivity of Hepatic Carcinoma Cells

Objective: The study was undertaken to investigate the effects of polyethyleneimine (PEI)-mediated adenovirus 5 early region 1A (E1A) on radiosensitivity of human hepatic carcinoma cell in vitro and to disclosure the underlying mechanism. Materials and Methods: Human hepatic carcinoma SMMC-7721 cell line was transfected with E1A gene using PEI vector. Untransfected cells (SMMC-7721 group), cells transfected with blank-vector (SMMC-7721-vect group), and cells transfected with E1A gene (SMMC-7721-E1A group) were treated with 6 MV X-ray irradiation at doses of 0, 1, 2, 4, 8 and Gy, respectively. Radiosensitivity was determined by MTT assay and quantified by calculating the cell survival rate. Cell-cycle distribution and apotosis rate were monitored by flow cytometry. Results: The survival rate of SMMC-7721-E1A was significantly lower than that of SMMC-7721 cell. Apoptosis rate of SMMC-7721-E1A group was significantly higher than that of SMMC-7721group (P<0.01).The ratio of S stage in cell cycle of SMMC-7721-E1A was significantly lower than that in SMMC-7721 cell. The ratio of G2/M stage in cell cycle of SMMC-7721-E1A was significantly higher than that in SMMC-7721 cell (P<0.01). Conclusion: PEI could transfect E1A gene into hepatic carcinoma cells PEI-mediated E1A could effectively enhance radiosensitivity of hepatic carcinoma cells which may be related to its effects on apoptosis promoting leading to S phase suppression and G2/M phase arrest.     

丹参多酚酸盐通过线粒体途径诱导人肝癌SMMC-7721细胞的凋亡

目的：研究丹参多酚酸盐(salvianolate)体外诱导人肝癌细胞SMMC-7721凋亡作用及其可能机制。方法：不同质量浓度丹参多酚酸盐(0.5、1、2 mg/ml)与肝癌细胞共培养24 h后,流式细胞仪检测肝癌细胞凋亡,线粒体膜电位试剂盒(JC-1)检测线粒体膜电位变化;比色法测定1.0 mg/ml丹参多酚酸盐作用后肝癌细胞内caspase8、caspase9 及caspase3的活性,流式细胞仪检测培养体系内加入caspase9抑制剂(zLEHDfmk)或caspase3抑制剂(zDEVDfmk)后细胞凋亡率的变化,Western blotting检测肝癌细胞内线粒体凋亡途径相关蛋白Bax、Bcl2表达水平。结果：丹参多酚酸盐显著诱导肝癌细胞SMMC7721凋亡(P<0.05),同时线粒体膜电位随着药物浓度的升高而加剧下降(P<0.05)。1.0 mg/ml 丹参多酚酸盐处理肝癌细胞24 h后caspase-9与caspase-3的活性明显升高(P<0.05),而caspase-8的活性无明显变化(P>0.05);当培养体系内加入caspase-9或caspase3活性抑制剂后,丹参多酚酸盐诱导肿瘤细胞凋亡的作用明显降低(P<0.05)。Western blotting检测显示,丹参多酚酸盐处理组前凋亡蛋白Bax表达明显升高,抗凋亡蛋白Bcl2表达降低。结论：丹参多酚酸盐(0.5~2.0 mg/ml)剂量具有促进肝癌细胞凋亡的作用,且有剂量依赖的趋势,其机制与线粒体凋亡途径有关。     

Survivin反义寡核苷酸诱导SMMC-7721细胞凋亡及对化疗药物敏感性作用的研究

目的：观察survivin反义寡核苷酸（ASODN）对SMMC-7721细胞增殖、凋亡的影响及其对化疗药物敏感性的作用。方法：设计合成特异性survivin的ASODN，脂质体转染肝细胞癌SMMC-7721细胞，透射电镜观察细胞超微结构变化；RT—PCR法检测survivinmRNA的表达变化；FCM法检测对细胞周期、凋亡及survivin蛋白表达的影响；MTT法测定survivin表达抑制前后细胞对吡柔比星、氟苷、顺铂敏感性的影响。结果：ASODN转染后细胞呈现凋亡的形态学改变，survivin mRNA和蛋白表达减弱（P〈0．05），诱导SMMC-7721细胞凋亡（P〈0．01），细胞周期阻滞于G2／M期（P〈0．05）。ASODN转染组可增加SMMC-7721细胞对吡柔比星、氟苷、顺铂的敏感性（P〈0、01）。结论：Survivin ASODN转染能下调survivin表达，诱导SMMC-7721细胞凋亡，提高对吡柔比星、氟苷、顺铂的敏感性。     

The effect of NET-1 on the proliferation, migration and endocytosis of the SMMC-7721 HCC cell line

To explore the effect of NET-1 on the proliferation, migration and endocytosis in the hepatocellular carcinoma (HCC) cell line SMMC-7721, we constructed the pU6H1-NET-1-siRNA (NET-1siRNA) and pcDNA3.1/myc-NET-1 (myc-NET-1) vectors and transfected them into SMMC-7721 cells. The expression levels of NET-1 mRNA and protein were detected using real-time quantitative RT-QPCR and western blotting. The proliferation rates of SMMC-7721 cells were determined by CCK-8 assays, flow cytometry (FCM) and immunohistochemistry staining. The migration in two or three dimensional space of SMMC-7721 cells were determined by wound-healing assay and in vitro invasion assay. The extent of endocytosis in SMMC-7721 cells was estimated by observing the amount of transferrin (Tfn) absorbed with capture ELISA assays, and Tfn endocytosis was observed under confocal immunofluorescence microscopy. The results show that: i) after transfecting NET-1 siRNA, the expression of NET-1 mRNA and protein in SMMC-7721 cells decreased significantly, the growth of cells was suppressed, which induced cell cycle arrest, the proliferation rates were dramatically reduced and the expression of Ki67 declined, and migration and endocytosis in cells were inhibited, compared with untreated cells (every P<0.01); ii) Following transfection with myc-NET-1, the expression of NET-1 mRNA and protein in SMMC-7721 cells increased, and both the proliferation of cells and the cell cycle were promoted (P<0.01, respectively). However, the abilities of cell migration and endocytosis were not affected compared with untreated cells. These data suggest that: i) the NET-1 gene may play an important role in proliferation, migration and endocytosis of cells; ii) siRNA technology may efficiently suppress the expression and function of NET-1 in HCC, suggesting that NET-1 may be a therapeutic target for HCC.     

中国鲎鲎素诱导人肝癌SMMC-7721细胞分化的观察

背景与目的：海洋生物活生物质抗肿瘤活性研究是海洋生物活性物质开发与抗癌药物研究的一个重要领域。诱导肿瘤细胞分化则是肿瘤药物治疗的新策略。本文拟研究海洋生物活性物质鲎素对人肝癌SMMC-7721细胞分化的影响,以为鲎素抗肿瘤作用及其机理的深入研究提供实验依据。方法：从中国鲎血细胞酸抽提液提取鲎素,应用光镜和透射电镜观察3.0μg/ml鲎素处理前后人肝癌SMMC-7721细胞形态和超微结构的变化,应用细胞化学或免疫细胞化学方法观察鲎素处理前后细胞碱性磷酸酶活性与甲胎蛋白和增殖细胞核抗原表达的变化。结果：经3.0μg/ml鲎素处理的SMMC-7721细胞形态和超微结构发生恢复性变化,碱性磷酸酶活性减弱,甲胎蛋白和增殖细胞抗原表达降低。结论：鲎素能有效改变肝癌细胞恶性形态和超微结构特征,改变肝癌细胞相关酶活性和抗原表达,对肝癌细胞具有一定的诱导分化作用。     

白眉蝮蛇去整合素rAdinbitor对人肝癌细胞系SMMC-7721细胞黏附与增殖的抑制作用

Objective:To investigate the effects of rAdinbitor on the adhesion and proliferation of human hepatoma cell strain SMMC-7721.Methods:Cell adhesion assay was used to observe the effect of rAdinbitor on the adhesion of SMMC-7721 cells to fibronectin (FN).Crystal violet staining was performed to detect the influence of rAdinbitor on the adhesion of SMMC7721 cells.MTT assay was employed to detect the inhibitory effects of different concentration of rAdinbitor on the proliferation of SMMC-7721 cells.The morphologic changes of the control SMMC-7721 cells and the apoptotic cells induced by 200 μg/mL rAdinbitor for 36 h were observed under light microscope after HE staining.Flow cytometry analysis was applied to determine the apoptosis rate of SMMC-7721 cells.Results:(1) FN promoted the adhesion of human hepatoma cell strain SMMC-7721 in a dose-dependent manner.(2) rAdinbitor could dose-dependently inhibit the adhesion of SMMC-7721 cells to FN.The higher the concentration was,the stronger the inhibition was.There was significant difference among the groups (P＜0.05).(3) rAdinbitor had a strong inhibition on the proliferation of SMMC-7721 cells and showed a dose-dependent manner (P＜0.05).After a 48 h exposure,the IC5o value of rAdinbitor was 177.83 μg/mL.(4) After exposure of SMMC-7721 cells to 200 μg/mL rAdinbitor for 36 h,the eady morphologic changes appeared and the apoptosis rate was 20.68%,significantly higher than that of the control group (2.38%,P＜0.05).Conclusion:rAdinbitor can dose-dependently inhibit the SMMC-7721 cells adhesion to FN,and can inhibit the proliferation in dose-dependent manner and promote their apoptosis.