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 μg/ml dosedependently inhibited the proliferation of SMMC-7721. The 50% effective dose, evaluated on day 3 of exposure to the extract, was 64.52±3.53 μg/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.     

水飞蓟宾对人肝癌细胞SMMC-7721体外增殖的影响

目的:探讨水飞蓟宾对SMMC-7721细胞的抗增殖作用。方法:MTT法观察对细胞的抑制作用;免疫细胞化学法检测增殖细胞核抗原(PCNA)及Ki-67的表达;流式细胞仪分析细胞周期及凋亡;光镜及透射电镜观察细胞形态学的变化。结果:水飞蓟宾可抑制SMMC-7721的增殖,并降低PCNA、Ki-67的表达及引起细胞G2/M期阻滞,同时诱导凋亡。光镜发现细胞体积缩小,核固缩深染;电镜可见凋亡及凋亡小体。结论:在体外,水飞蓟宾可抑制SMMC-7721细胞的增殖。     

Anti-hepatoma cells function of luteolin through inducing apoptosis and cell cycle arrest

The aim of this study is to explore the apoptotic induction and cell cycle arrest function of luteolin on the liver cancer cells and the related mechanism. The liver cancer cell line SMMC-7721, BEL-7402, and normal liver cells HL-7702 were treated with different concentrations of luteolin. Cell proliferation ability was tested. Morphological changes of the apoptotic cells were observed under inverted fluorescence microscope after Hoechst33342 staining. We investigated the effect of luteolin on cell cycling and apoptosis with flow cytometry. The mitochondrial membrane potential changes were analyzed after JC-1 staining. Caspases-3 and Bcl-2 family proteins expression were analyzed by real-time PCR. Cell proliferation of SMMC-7721 and BEL-7402 were inhibited by luteolin, and the inhibition was dose–time-dependent. Luteolin could arrest the cells at G1/S stage, reduce mitochondrial membrane potential, and induce higher apoptosis rate and the typical apoptotic morphological changes of the liver carcinoma cells. Q-RT-PCR results also showed that luteolin increased Bax and caspase-3 expression significantly and upregulated Bcl-2 expression in a dose-dependent manner in liver carcinoma cells. However, the normal liver cells HL-7702 was almost not affected by luteolin treatment. Luteolin can inhibit SMMC-7721 and BEL-7402 cell proliferation in a time- and dose-dependent manner. And the mechanism maybe through arresting cell cycle at phase G1/S, enhancing Bax level, reducing anti-apoptotic protein Bcl-2 level, resulting in activating caspase-3 enzyme and decrease of mitochondrial membrane potential, and finally leading to cell apoptosis.     

Inhibition of Growth and Induction of Differentiation ofSMMC-7721 Human Hepatocellular Carcinoma Cells byOncostatin M

Oncostatin M (OSM) is a multifunctional cellular regulator acting on a wide variety of cells, which haspotential roles in the regulation of gene activation, cell survival, proliferation and differentiation. Previousstudies have shown that OSM can induce morphological and/or functional differentiation and maturation ofmany tumor cells. However, the action of OSM on the induction of differentiation of human hepatocellularcarcinoma (HCC) has not been reported. Here, we investigated the effects of different concentrations of OSMon human HCC cell line SMMC-7721 growth, proliferation, cell cycling, apoptosis and differentiation in vitro.Cell growth was determined via MTT assay, proliferation by cell cycle analysis, apoptosis by flow cytometry,morphology by transmission electronic microscopy, and cell function by detection of biochemical markers.Our results demonstrated that OSM strongly inhibited the growth of SMMC-7721 cells in a dose-dependentmanner, associated with decreased clonogenicity. Cell cycle analysis revealed a decreased proportion of cells inS phase, with arrest at G0/G1. The apotosis rate was increased after OSM treatment compared to the control.These changes were associated with striking changes in cellular morphology, toward a more mature hepaticphenotype, accompanied by significant reduction of the expression of AFP and specific activity of γ-GT, withremarkable increase in secretion of albumin and ALP activity. Taken together, our findings indicate that OSMcould induce the differentiation and reduce cell viability of SMMC-7721 cells, suggesting that differentiationtherapy with OSM offers the opportunity for therapeutic intervention in HCC.     

人参皂甙 Rh2对人肝癌细胞 SMMC-7721的诱导分化作用

背景与目的:目前寻找低毒高效的分化诱导剂是肿瘤诱导分化治疗的关键.人参具有抗肿瘤、抗衰老、抗辐射等多种生物学活性,其主要的活性有效成分人参皂甙 Rh2( ginsenoside Rh2,G-Rh2)具有较强的抗癌活性,但其抗肿瘤机制还不十分清楚.因此,本研究探讨 G-Rh2对人肝癌细胞株 SMMC-7721的生长抑制作用及抗癌机制.方法:以 MTT法、光镜、电子显微镜观察 G-Rh2对 SMMC-7721细胞增殖、形态、超微结构的影响.用免疫组化染色和 ELISA法检测细胞浆中甲胎蛋白( alpha-fetoprotein, AFP)合成情况,酶促反应试剂盒检测细胞浆中碱性磷酸酶( alkaline phosphatase, ALP)和γ谷氨酰转肽酶(γ-glutamyltranspeptidase,γ-GT)活性,放射免疫法检测细胞 AFP和白蛋白( albumin, Alb)分泌量,并观察 G-Rh2对以上指标的影响.结果: G-Rh2以时间依赖性和浓度依赖性抑制 SMMC-7721细胞增殖, 10 μ g/ml G-Rh2作用 6天抑制率达 50%;而 20 μ g/ml G-Rh2作用 4天抑制率近 50%.经 20 μ g/ml G-Rh2作用 4天,肝癌细胞形态及亚细胞结构向正常肝细胞方向逆转. 10 μ g/ml、 20 μ g/ml G-Rh2作用 SMMC-7721细胞后, AFP合成明显下降( P< 0.05),分泌量从 6.60± 0.30下降到 2.35± 0.06( P< 0.01);γ-GT及耐热型 ALP活性显著降低( P< 0.01); ALP活性及 Alb分泌量显著升高( P< 0.01).结论: G-Rh2具有诱导人肝癌细胞 SMMC-7721向正常细胞分化的作用.     

菱角提取物诱导人肝癌SMMC-7721细胞凋亡

[目的]探讨菱角提取物对人肝癌SMMC-7721细胞的增殖抑制及诱导凋亡作用。[方法]采用MTT法检测菱角提取物对SMMC-7721细胞的增殖抑制作用;丫啶橙染色、DNA琼脂糖凝胶电泳和流式细胞仪检测细胞凋亡。[结果]菱角提取物能抑制SMMC-7721细胞的增殖,且呈明显的剂量依赖性。荧光显微镜下细胞呈典型的凋亡形态学改变。[结论]菱角提取物可抑制SMMC-7721细胞的增殖并诱导其凋亡。     

人剪切修复基因XPD对肝癌细胞生长的抑制作用

目的探讨野生型人剪切修复基因着色性干皮病基因D(xeroderma pigmentosum D,XPD)对肝癌细胞SMMC-7721增殖的影响,并探讨其机制。方法用脂质体转染法瞬时转染SMMC-7721细胞,转染重组质粒XPD-N2和空载质粒N2,并用未转染的与XPD-N2、N2具有相同遗传背景和代数的SMMC-721细胞作为空白对照。荧光显微镜观察绿色荧光蛋白报告基因表达情况,流式细胞仪检测细胞周期,逆转录-聚合酶链反应（RT-PCR）、Western blot法检测细胞中XPD、c-myc、cdc25A、cdK2表达量变化,MTT法观察细胞增殖的活力。结果提取出的重组质粒pEGFP-N2-XPD用酶切鉴定,与Genebank上的相符。在荧光显微镜下,可以在SMMC-7721-pEGFP-N2、SMMC-7721-pEGFP-N2-XPD细胞中观察到绿色荧光蛋白的表达,质粒的转染效率为30%左右。流式细胞仪结果显示,pEGFP-N2-XPD重组质粒转染入细胞后,肝癌细胞进入S期发生阻滞,停滞在G1期。RT-PCR、Western blot检测发现SMMC-7721-pEGFP-N2-XPD细胞与SMMC-7721-pEGFP-N2和SMMC-7721两对照组相比,其XPD 表达明显增高（P<0.05）。c-myc、cdc25A、cdK2相对表达量明显减少,差异有统计学意义（P<0.05）。与两对照组相比,SMMC-7721-pEGFP-N2-XPD细胞增殖率明显减弱（P<0.05）。结论野生型XPD基因可以在转录和翻译水平抑制SMMC-7721细胞内c-myc、cdc25A、cdK2的表达。而且野生型XPD基因通过抑制cdK2的表达作用于S期DNA损伤检控点,从而抑制SMMC-7721细胞增殖。     

鸦胆子油对肝癌细胞SMMC-7721增殖的抑制作用

目的：探讨鸦胆子油抑制肝癌细胞生长的机制。方法：人肝癌细胞SMMC-7721培养于含10%胎牛血清、100 U·ml^-1青霉素、链霉素的RPMI1640培养液中。以不同浓度的鸦胆子油乳加入培养液,作用一定的时间,进行MTT比色实验,检测生长抑制率及分析细胞周期。结果：MTT比色法测定显示鸦胆子油抑制肝癌细胞的生长,随着浓度增加和作用时间的延长,抑制作用呈现逐渐增加的趋势。细胞周期分析提示：G0-G1期比例逐渐增加,而S期比例逐渐减少,1μg·ml^-1组中各时间点及2μg.ml-1组中各时间点均有显著差异（P〈0.01）。G2-M期细胞比例减少,但差异无统计学意义（P〉0.05）。结论：鸦胆子油抑制体外培养的人肝癌细胞的增殖,机制可能是将肝癌细胞阻滞于G0-G1期。     

顺铂对肝癌细胞株SMMC-7721中SATB1表达的影响

目的:探讨肝癌细胞株SMMC-7721加入顺铂后细胞形态及特异AT序列结合蛋白1(special AT-rich sequence-bindingprotein 1,SATB1)表达的变化。方法:SMMC-7721细胞株中加入不同浓度(0、2.5、5和10μg/ml)顺铂培养24 h后,在倒置显微镜下观察细胞形态变化,半定量逆转录RT-PCR法检测SATB1 mRNA的表达,Western blot检测SATB1蛋白的表达。结果:SMMC-7721细胞与不同浓度顺铂共培养24 h后,倒置显微镜下可见细胞形态明显改变,细胞数减少,损伤、死亡的细胞增多。SATB1mRNA及蛋白的表达均随着顺铂浓度的增加而减少,其中5和10μg/ml顺铂组与对照组间的差异均有统计学意义(P<0.05或P<0.01)。结论:顺铂可抑制SMMC-7721细胞增殖及SATB1的表达,从而达到抑制肝癌细胞生长的目的。     

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.     

复方苦参注射液联合奥沙利铂对人肝癌细胞株ＳＭＭＣ-７７２１增殖与凋亡的影响

目的　通过观察复方苦参注射液、奥沙利铂（ＯＸＡ）及其两药联合对人肝癌细胞株ＳＭＭＣ-７７２１增殖与凋亡的影响,探讨中药与化疗药物联合应用的协同增效作用。方法　采用ＭＴＴ法观察复方苦参注射液、ＯＸＡ及其两药联合对ＳＭＭＣ-７７２１细胞增殖的影响;应用流式细胞术分析对细胞周期的影响;采用原位末端标记法（ＴＵＮＥＬ）和荧光染色法观察对细胞凋亡的作用。结果　复方苦参注射液和ＯＸＡ对ＳＭＭＣ-７７２１细胞均有明显的抑制增殖作用,该作用随着药物作用时间的延长、剂量的增加而逐渐增强（Ｐ＜００１）;两药联合表现为相加或协同作用,与单药比较,有显著性差异（Ｐ＜０.０５）。ＴＵＮＥＬ法检测结果表明,复方苦参注射液（２５μｌ／ｍｌ）、ＯＸＡ（１μｇ／ｍｌ）以及两药联合作用于ＳＭＭＣ-７７２１细胞后均可诱导肝癌细胞凋亡,凋亡指数（ＡＩ）分别为２５.２％、１６.２％和３６.３％,联合组明显优于单药组（Ｐ＜０.０５）。流式细胞术分析显示,复方苦参注射液、ＯＸＡ均可使细胞被阻滞于Ｇ０／Ｇ１期,两药联合较单药更为显著（Ｐ＜０.０５）。结论　复方苦参注射液、ＯＸＡ均能抑制人肝癌细胞株ＳＭＭＣ-７７２１的增殖和诱导细胞凋亡,将细胞阻滞于Ｇ０／Ｇ１期,两药联合后作用加强,提示复方苦参注射液和ＯＸＡ联合应用治疗肝癌可能会起到协同增效的作用。     

TSA对人肝癌细胞SMMC-7721的抑制作用及其机制

目的:研究去乙酰化转移酶抑制剂TSA对肝癌细胞SMMC-7721的作用及其机理。方法:利用细胞计数,流式细胞仪分析细胞凋亡及细胞周期,Tunel试验研究TSA对肝癌细胞SMMC-7721的作用;利用western研究TSA对肝癌细胞蛋白表达的影响。结果:TSA可明显抑制肝癌细胞SMMC-7721的生长,并可诱导细胞凋亡。可阻滞肝癌细胞SMMC-7721细胞周期于G0/G1期。可增加p53,p21,bax等基因的表达,降低BCL-2的表达。结论:去乙酰化转移酶抑制剂TSA可明显抑制肝癌细胞SMMC-7721的生长并诱导其凋亡,其主要通过调控一些肿瘤相关基因的表达起作用。     

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.     

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。     

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.     

奥沙利铂和人参皂苷Rg3不同联合方式对人肝癌细胞株SMMC-7721作用的影响

目的 通过体外实验观察奥沙利铂和人参皂苷Rg3不同联合方式对人肝癌细胞株SMMC-7721作用的影响,并初步探讨其机制。方法 采用MTT法观察奥沙利铂、人参皂苷Rg3单药以及两药同时和序贯应用对SMMC-7721细胞增殖的作用;应用流式细胞术分析单药和两药不同序贯方式对细胞周期分布及凋亡的影响;Western blotting检测单药和两药不同序贯方式作用后SMMC-7721细胞cyclin D1蛋白的表达情况。结果 奥沙利铂、人参皂苷Rg3单药、两药同时及序贯给药对SMMC-7721细胞增殖均有明显的抑制作用。同时用药组的增殖抑制作用优于人参皂苷Rg3先用组（P＜0.05）,但与奥沙利铂先用组比较未见明显差异（P＞0.05）;奥沙利铂先用组的效果优于人参皂苷Rg3先用组（P＜0.05）。流式细胞术分析显示,奥沙利铂主要将细胞阻滞在S期、G₂／M期,人参皂苷Rg3主要将细胞阻滞在G₀／G₁期,同时用药组和奥沙利铂先用组的凋亡率相似（P＞0.05）,阻滞细胞于G₂／M期,且凋亡率均较先用人参皂苷Rg3组高（P＜0.05）。Western blotting显示,两药序贯及同时应用组cyclin D1蛋白表达明显低于单药组,奥沙利铂先用组与同时用药组相似,均低于人参皂苷Rg3先用组。结论 奥沙利铂、人参皂苷Rg3序贯及同时应用较单药更能抑制人肝癌SMMC-7721细胞的增殖,先用奥沙利铂后序贯人参皂苷Rg3与两药同时应用的协同增效作用相似,均优于先用人参皂苷Rg3后序贯奥沙利铂,其机制可能与奥沙利铂先用组和同时用药组将细胞阻滞在S期、G₂／M期,增加促凋亡作用,同时下调cyclin D1蛋白的表达水平有关。     

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.     

GDF11对肝细胞癌SMMC-7721细胞增殖能力及顺铂敏感度的影响

目的 研究GDF11（growth differentiation factor 11）过表达对肝细胞癌SMMC-7721细胞体外增殖能力及顺铂敏感度的影响。方法 前期成功构建GDF11过表达的SMMC-7721细胞,同时以空载体感染细胞组及野生型细胞组为对照。CCK-8法检测细胞增殖能力,平板克隆形成实验检测细胞克隆形成能力。CCK-8法检测GDF11过表达对细胞顺铂药物敏感度的影响。结果 Western blot结果验证,已成功构建GDF11过表达的SMMC-7721细胞。GDF11过表达可明显抑制SMMC-7721细胞的体外增殖能力,在96、120及144 h时抑制作用最显著（P<0.05）,且实验组细胞较对照组克隆形成能力明显减弱（P<0.05）。GDF11过表达能够增强肝细胞癌SMMC-7721细胞对顺铂的敏感度,顺铂浓度取20 μg/ml及40 μg/ml时,与对照组相比差异有统计学意义（P<0.05）。结论 肝细胞癌SMMC-7721细胞过表达GDF11蛋白后,其体外增殖及克隆形成能力明显降低,对化疗药物顺铂的敏感度增强。     

珠子参体外诱导人肝癌细胞凋亡效应及机制研究

目的观察珠子参体外诱导人肝癌细胞凋亡效应并初探其分子机制。方法体外细胞培养采用人肝癌细胞株SMMC-7721,分为对照(BL)组、珠子参(PJ)组、二甲基亚砜(DMSO)组及5-FU组,采用电镜观察作用后肝癌细胞超微结构改变;流式细胞仪检测肝癌细胞周期和凋亡率;RT-PCR法检测癌基因c-myc、c-fos和抑癌基因p53、p21表达的变化。结果与对照组比较,电镜下珠子参组SMMC-7721细胞染色质浓缩,分解成大小不一有膜包绕团块,内含有新月形DNA物质及细胞器,形成凋亡小体;周期分析可见G0/G1期细胞阻滞,阻止了细胞向S期的转换,并引起细胞凋亡,凋亡率达38.34%;RT-PCR半定量分析珠子参能降低癌基因c-myc表达(P<0.05),增高抑癌基因p53和p21表达(P<0.05)。结论珠子参能诱导人肝癌细胞SMMC-7721凋亡,部分作用机制可能与阻滞细胞停留在G0/G1,降低癌基因c-myc和c-fos表达,增高抑癌基因p53和p21表达有关。