Growth inhibition and apoptosis induction in human hepatoma cells by tanshinone II A.

In order to study the effect of tanshinone II A on growth and apoptosis in human hepatoma cell line BEL-7402 in vitro, the human hepatoma cell line BEL-7402 was treated with tanshinone II A at various concentrations for 72 h. Growth suppression was evaluated by MTT assay; apoptosis-related alterations in morphology and biochemistry were ascertained under cytochemical staining (Hoechst 33258), transmission electron microscopy (TEM), and DNA agarose gel electrophoresis. Apoptotic rate was quantified by flow cytometry (FCM). The results showed that Tanshinone II A could inhibit the growth of hepatoma cells in a dose-dependent manner, with IC50 value being 6.28 micrograms/ml. After treatment with 1-10 micrograms/ml tanshinone II A for 72 h, BEL-7402 cells apoptosis with nuclear chromatin condensation and fragmentation as well as cell shrinkage and the formation of apoptotic bodies were observed. DNA ladder could be demonstrated on DNA electrophoresis. FCM analysis showed hypodiploid peaks on histogram, and the apoptotic rates at 5 micrograms/ml concentration for 12 h, 24 h, 36 h, 48 h and 72 h were (2.32 +/- 0.16)%, (3.01 +/- 0.35)%, (3.87 +/- 0.43)%, (6.73 +/- 0.58)% and (20.85 +/- 1.74)% respectively, which were all significantly higher than those in the control group (1.07 +/- 0.13)%. It is concluded that Tanshinone II A could induce human hepatoma cell line BEL-7402 apoptosis, which may be related to the mechanism of growth inhibition.     

Growth Inhibition and Apoptosis Induction in Human Hepatoma Cells by Tanshinone Ⅱ_A

Summary:In order to study the effect of tanshinone Ⅱ_A on growth and apoptosis in human hepatomacell line BEL-7402 in vitro,the human hepatoma cell line BEL-7402 was treated with tanshinone Ⅱ_Aat various concentrations for 72 h.Growth suppression was evaluated by MTT assay;apoptosis-relat-ed alterations in morphology and biochemistry were ascertained under cytochemical staining(Hoechst33258),transmission electron microscopy(TEM),and DNA agarose gel electrophoresis.Apoptoticrate was quantified by flow cytometry(FCM).The results showed thst Tanshinone Ⅱ_A could inhibitthe growth of hepatoma cells in a dose-dependent manner,with IC_(50) value being 6.28μg/ml.Aftertreatment with 1—10 μg/ml tanshinone Ⅱ_A for 72 h,BEL-7402 cells apoptosis with nuclear chro-matin condensation and fragmentation as well as cell shrinkage and the formation of apoptotic bodieswere observed.DNA ladder could be demonstrated on DNA electrophoresis.FCM analysis showedhypodiploid peaks on histogram,and the apoptotic rates at 5     

丹参酮ⅡA抑制HepG2细胞生长及诱导其凋亡的实验研究

目的:研究丹参酮ⅡA对人肝癌细胞HepG2的生长抑制作用和凋亡诱导作用.方法:以0μg/mL丹参酮ⅡA作阴性对照,MTT法检测0.5～10.0 μg/mL丹参酮ⅡA作用人肝癌细胞HepG2 24,48,72 h的生长抑制率;HT33258荧光染色、琼脂糖凝胶电泳、流式细胞仪检测不同浓度丹参酮ⅡA作用HepG2细胞72 h后的细胞凋亡.结果:0.5～10.0 μg/mL丹参酮ⅡA均能抑制人肝癌细胞HepG2生长,并有明显的时间和剂量依赖性;在24,48,72 h的半数抑制浓度分别为14.7,7.4,3.9 μg/mL;经丹参酮ⅡA作用后,荧光染色可以观察到典型的凋亡细胞形态特征;琼脂糖凝胶电泳结果显示除1.0 μg/mL组外均可见明显的凋亡细胞形成的梯状条带;流式细胞仪检测不同浓度丹参酮ⅡA作用72 h后的细胞凋亡率分别为20.32%±2.16%,28.01%±2.35%,33.87%±3.43%,46.73%±4.08%和57.85%±3.74%,与对照组比较差异均有统计学意义(P＜0.05).结论:丹参酮ⅡA在体外能明显抑制人肝癌细胞HepG2生长,抑制其生长的机制可能是诱导细胞凋亡.     

Growth inhibition and apoptosis induction in human hepatoma cells by tanshinone II<Subscript>A</Subscript>

Summary In order to study the effect of tanshinone II_A on growth and apoptosis in human hepatoma cell line BEL-7402in vitro, the human hepatoma cell line BEL-7402 was treated with tanshione I_A at various concentrations for 72 h. Growth suppression was evaluated by MTT assay; apoptosis-related alterations in morphology and biochemistry were ascertained under cytochemical staining (Hoechst 33258), transmission electron microscopy (TEM), and DNA agarose gel electrophoresis. Apoptotic rate was quantified by flow cytometry (FCM). The results showed that Tanshinone II_A could inhibit the growth of hepatoma cells in a dose-dependent manner, with IC₅₀ value being 6.28 μg/ml. After treatment with 1–10 μg/ml tanshione II_A for 72 h, BEL-7402 cells apoptosis with nuclear chromatin condensation and fragmentation as well as cell shrinkage and the formation of apoptotic bodies were observed. DNA ladder could be demonstrated on DNA electrophoresis. FCM analysis showed hypodiploid peaks on histogram, and the apoptotic rates at 5 μg/ml concentration for 12 h, 24 h, 36 h, 48 h and 72 h were (2.32±0.16)%, (3.01±0.35)%, (3.87±0.43)%, (6.73±0.58)% and (20.85±1.74)% respectively, which were all significantly higher than those in the control group (1.07±0.13)%. It is concluded that Tanshione II_A could induce human hepatoma cell line BEL-7402 apoptosis, which may be related to the mechanism of growth inhibition. TANG Zhongzhi, male, born in 1966, Doctor in Charge This project was supported by a grant from Natural Sciences Foundation of Hubei Province (No. 2000J064).     

Antineoplastic mechanism of Octreotide actionin human hepatoma

Objectives To investigate whether apoptosis can be induced by Octreotide in human hepatoma cells in vitro and elucidate the antineoplastic mechanism of Octreotide in hepat oma. Methods A cultured human hepatoma cell line, BEL-7402, was exposed to Octreotide and ap optosis was evaluated by cytochemical staining (Hochesst 33 258), transmiss ion electron microscopy, agarose gel electrophoresis and flow cytometry (FCM).Results After exposure to 0.2 μg/ml Octreotide, apoptosis with nuclear chromatin cond ensation as well as fragmentation, cell shrinkage and the formation of apoptotic bodies was observed using cytochemical staining and transmission electron micros copy. A DNA ladder in agarose gel electrophoresis was also displayed. FCM show ed that the apoptotic cell number rose with an increase in the concentration of Octreotide (0-2 μg/ml). There was a positive correlation between Octreotide concentration and apoptotic rate in BEL-7402 cells (r=0.809, P&lt;0.05) .Conclusion Apoptosis in human hepatoma cells can be induced by Octreotide, which may be rel ated to the mechanism of antineoplastic action ofOctreotide in hepatoma.     

酒石酸锑钾在诱导人肝癌BEL-7402细胞凋亡中的影响

目的:本研究旨在明确酒石酸锑钾(PAT)在体外对人肝癌BEL7402细胞凋亡的影响及抑癌机制。方法:用PAT以不同浓度、不同时间作用于人肝癌BEL7402细胞,以诱导其凋亡。用MTT比色法观察其细胞毒性,荧光显微镜、透射电镜、TUNEL染色法及流式细胞术(FCM)等方法来检测凋亡,观察其形态学和生化方面的变化。结果:PAT以剂量依赖和时间依赖的方式抑制BEL7402细胞的生长。5～40μmol·L-1的PAT处理48h后,形态学上,肝癌细胞表现为细胞皱缩、核质浓缩、核碎裂、细胞起泡以及凋亡小体形式等凋亡特征的形态学改变。DNA末端原位标记染色法、流式细胞仪均能检测到凋亡细胞。结论:PAT在体外诱导肝癌BEL7402细胞凋亡,能作为一种凋亡诱导剂用于肝癌的治疗。     

Effect of lidamycin on telomerase activity in human hepatoma BEL-7402 cells

Objective To investigate the effect of lidamycin (LDM) on telomerase activity in human hepatoma BEL-7402 cells under the condition of LDM inducing mitotic cell death and senescence. Methods Chromatin condensation was detected by co-staining with Hoechst 33342 and PI. Cell multinucleation was observed by Giemsa staining and genomic DNA was separated by agarose gel electrophoresis. Fluorescent intensity of Rho123 was determined for mitochondrial membrane potential. MTT assay and SA-β-gal staining were employed to analyze the senescence-like phenotype. The expression of proteins was analyzed by Western blot. Telomerase activity was assayed by telomerase PCR-ELISA. Results Mitotic cell death occurred in LDM-treated cells characterized by unique and atypical chromatin condensation, multinucleation and increased mitochondrial membrane potential. However, no apoptotic bodies or DNA ladders were found. In addition, apoptosis-related proteins remained nearly unaltered. Senescence-like phenotype was identified by increased and elongated size of cells, growth retardation, enhanced SA-β-gal activity and the changes of senescence-related protein expression. Telomerase activity markedly decreased (P<0.01) in LDM-treated hepatoma BEL-7402 cells. Conclusion Mitotic cell death and senescence could be triggered simultaneously or sequentially after exposure of hepatoma BEL-7402 cells to LDM. The decrease in telomerase activity may play a key role in the defective mitosis and aging morphology. Further investigation of detailed mechanism is needed.     

15-脱氧前列腺素J2体外诱导肝癌细胞失巢凋亡的研究

目的研究15-脱氧前列腺素J2（15-d-PGJ2）体外诱导人肝癌细胞系BEL-7402细胞失巢凋亡的特性,并探讨其机制。方法在纤连蛋白（Fn）或多聚2．羟乙基甲基丙烯酸脂（poly-HEMA）包被的培养板中,应用光学显微镜观察不同因素处理后的细胞生长状态和形态学变化;应用DNA片段分析和流式细胞术观察细胞的凋亡变化;应用Western印迹技术观察细胞焦点黏着斑激酶（FAK）和磷酸化FAK（p-FAK）蛋白质的表达;应用小RNA干扰技术来沉默FAK基因。结果在Fn包被的培养板中贴壁生长的BEL-7402细胞经15一d—PGJ：处理24h或48h后,细胞变圆,脱离细胞外基质呈悬浮状态改变,而且这种改变呈时间和剂量依赖性关系;其中以浓度为20μmol／L的15-d-PGJ2最为显著,24h和48h时问点细胞的黏附比率分别为（66．0±3．6）％和（35．0±5．0）％,与肝癌细胞对照相比差异有统计学意义（P〈0．05）。经流式细胞术和DNA片段分析后发现肝癌细胞发生了失巢凋亡;Western印迹显示p-FAK蛋白下降,而FAK蛋白质表达水平未发生改变。结论15-d-PGJ2在体外能够诱导BEL-7402细胞失巢凋亡,这一过程与细胞FAK磷酸化水平降低有关。     

绿脓杆菌制剂对人肝癌细胞株BEL-7402的杀伤效应

目的探索绿脓杆菌制剂对人肝癌细胞BEL-7402的杀伤效应。方法采用MTT法检测不同浓度的绿脓杆菌制剂对人肝癌细胞BEL-7402增殖的作用,同时利用电子显微镜、透射电镜观察细胞BEL-7402的形态学变化。结果MTT检测表明：绿脓杆菌制剂为10×107/mL、5×107/mL、2.5×107/mL时对肝癌细胞生长杀伤作用与对照组比较差异有高度统计学意义（P〈0.01）;电子显微镜、透射电镜观察发现肝癌细胞BEL-7402于12、24 h出现凋亡形态学改变,40 h形态学表现为凋亡与坏死并存。结论绿脓杆菌制剂对肝癌细胞BEL-7402生长有抑制作用,诱导细胞凋亡及坏死可能是主要作用机制。     

根皮素诱导肝癌BEL-7402细胞凋亡

目的 研究根皮素诱导肝癌细胞系BEL-7402细胞凋亡.方法 MTT法测定BEL-7402细胞毒性,荧光显微镜观察细胞形态学的变化,流式细胞仪分析细胞周期和线粒体膜电位的变化.发色底物法检测Caspase-3、Caspase-6和Caspase-9活性变化.结果 根皮素对BEL-7402细胞IC50在89.23 μg/mL.BEL-7402细胞生长曲线表明,根皮素浓度增高,生长率明显下降.细胞凋亡可在40～160 μg/mL根皮素处理后24 h出现.凋亡细胞主要表现为核染色质固缩,荧光染色增强.根皮素阻断细胞于G1期,线粒体膜电位降低.Caspase-3、Caspase-6和Caspase-9被激活,呈时间依赖性改变.根皮素处理BEL-7402细胞12 h Caspase-9活性最高,而Caspase-6活性在18 h达峰值,Caspase-3活性峰值时间在24h后.结论 根皮素可以诱导BEL-7402细胞发生凋亡,途径可能是通过线粒体旁路.     

亚砷酸体外对人肝癌细胞株BEL-7402影响的初步研究

目的 体外培养人肝癌细胞株BEL－7402,从多个角度探讨三氧化二砷（As2O3）的抗肿瘤作用及其机制。方法 应用倒置相差显微镜、电子显微镜、透谢电镜、流式细胞仪,分别对不同浓度加药组及对照组BEL－7402细胞的存活。形态学改变,细胞DNA含量的分布进行了观察和测定。结果 0.5、1、2μmol/L As2O3均能抑制人肝癌细胞株BEL－7402细胞的生长增殖。流式细胞仪分析显示,加药组在G1期细胞前均出现亚二倍体峰,且G0／G1期细胞减少,S期细胞增多;电镜下,对照组细胞核质比大、核大、核膜有明显切迹,0.5μmol/L As2O3组细胞核质比减少、核变圆、胞浆内出现分化良好的细胞器, 0.5、1、2μmol/L As2O3组均可见细胞膜完整、核固缩、凋亡小体形成。结论 三氧化二砷不仅抑制人肝癌细胞增殖,而且诱导细胞凋亡。     

紫杉醇、5-氟脲嘧啶抑制肝癌细胞BEL-7402生长和诱导凋亡的比较

OBJECTIVE: To investigate the effect of paclitaxel and 5-flurouracil (5-Fu) on growth inhibition and apoptosis of human hepatoma BEL-7402 cells. METHODS: Growth inhibition of BEL-7402 cells treated with paclitaxel and 5-Fu, respectively, was measured by ATP-tumor chemosensitivity assay (ATP-TCA), and the cell cycle kinetics and apoptosis were analyzed by flow cytometry and microscopic examination. RESULTS: BEL-7402 cells were highly sensitive to paclitaxel with growth inhibition observed in both dose- and time-dependent manners (IC(50)=5.58 x 10(-7) mol/L). Paclitaxel induced significantly higher rate of cell apoptosis than the control group (P<0.05) but significantly lower rate than that induced by 5-Fu (P<0.01). Necrosis was observed predominantly in paclitaxel-treated cells whereas 5-Fu caused mainly cell apoptosis (P<0.05). Levels of apoptosis increased in proportion to the decrement of paclitaxel concentration but directly proportional to increment of 5-Fu concentration. CONCLUSIONS: Paclitaxel and 5-Fu are effective in inducing growth inhibition and apoptosis of BEL-7402 cells. While 5-Fu causes mainly apoptosis in hepatoma cells, the anticancer mechanism of paclitaxel is predominantly through induction of necrosis.     

雷帕霉素联合阿霉素对肝癌细胞BEL-7402增殖及迁移的影响及其作用机制

目的:探讨雷帕霉素(RAPA)与阿霉素(ADM)联合应用对肝癌细胞BEL-7402增殖和迁移的影响,阐明其作用机制.方法:选取处于对数生长期肝癌细胞株BEL7402随机分为空白对照组、乙醇溶媒组、RAPA组、ADM组以及联合用药组,采用MTT法检测各组细胞6 d内的增殖情况,采用RT-PCR方法检测cyclin D1和...     

姜黄素单体影响肝癌BEL-7402细胞凋亡及其周期蛋白D表达的研究

目的 采用细胞学实验观察3种姜黄素单体对肝癌细胞株BEL-7402的抑制增殖及诱导细胞凋亡的作用强度和机制.方法 以四甲基偶氮唑蓝(MTT)、Annexin Ⅴ-FITC双标记及流式细胞术(FCM)实验观察3种姜黄素对肝癌细胞株BEL-7402增殖的抑制作用与细胞周期变化,采用 Western blot实验分析3种姜黄素对肝癌细胞株BEL-7402细胞周期蛋白D表达的影响.结果 (1)3种姜黄素均可通过诱导肝癌细胞凋亡而有效抑制肝癌细胞生长增殖,存在时间与剂量效应,以姜黄素Ⅲ抑制效果最强.(2)3种姜黄素通过影响细胞周期生长的调控信号、降低细胞周期蛋白D表达量致使肝癌细胞停滞于G1/S期.结论 3种姜黄素均可通过抑制肝癌细胞周期蛋白D表达而诱导细胞凋亡,有效地抑制肝癌细胞生长增殖,具有很高的临床治疗价值.     

人骨形成蛋白-2诱导人脑胶质瘤细胞凋亡的实验研究

目的 探讨重组人骨形成蛋白－２（ｒｈＢＭＰ－２）对体内、外人脑胶质瘤ＳＨＧ４４细胞生物学特性的影响。方法 绘制ｒｈＢＭＰ－２作用前、后的ＳＨＧ４４细胞生长曲线,ＭＴＴ法测定ｒｈＢＭＰ－２对ＳＨＧ４４细胞增殖的作用;以流式细胞仪、电镜和琼脂糖凝胶电泳分别检测其细胞周期、超微结构和ＤＮＡ片段改变;观察局部注射ｒｈＢＭＰ－２对裸鼠皮下ＳＨＧ４４胶质瘤增长的影响。结果 流式细胞检测显示,ｒｈＢＭＰ－２可抑     

不同浓度中药柴胡提取物对人肝癌细胞内Ca2+和p53表达的影响

目的：测定不同浓度中药柴胡（Bupleurun Chinese DC,BCDC）提取物对BEL-7402细胞内游离钙离子浓度（[Ca^2＋]i）和p53表达的影响,以探索柴胡逆转BEL-7402细胞多药耐药的机制。方法：用Fura-2／AM作为细胞内钙离子的荧光指示剂,用双波长荧光分光光度计测定不同浓度柴胡提取物作用下BEL-7402细胞内[Ca^2＋]i及其剂量-效应关系;用免疫组化法检测不同条件下BEL-7402细胞的p53表达。结果：柴胡可使人肝癌细胞BEL-7402细胞内游离钙离子浓度下降（P〈0．001）,但不具有剂量-效应关系;BEL-7402细胞呈p53天然突变。结论：柴胡可使人肝癌细胞BEL-7402细胞内游离钙离子浓度下降,为一种钙离子通道阻滞剂（calcium channel blocker,CCB）,提示钙离子通道阻滞作用为柴胡逆转BEL-7402细胞多药耐药的机制之一;BEL-7402细胞呈p53天然突变也可直接或间接影响肿瘤多药耐药性的表达。     

顺铂对肝癌细胞株HepG2增殖和SATB1表达的影响

目的:观察特异AT序列结合蛋白1(special AT-rich sequence-binding protein 1,SATB1)在不同肝癌细胞株中的表达情况,并探讨顺铂对肝癌细胞株HepG2的细胞形态及SATB1表达的影响。方法:半定量反转录聚合酶链反应(RT-PCR)检测HepG2、BEL-7402、SMMC-7721三种肝癌细胞株中SATB1 mRNA的表达情况;HepG2细胞株中加入终浓度为2.5、5.0和10.0μg/ml顺铂培养24 h,倒置显微镜下观察细胞形态变化。结果:SATB1在肝癌细胞株BEL-7402、SMMC-7721、HepG2中均有表达,差异无统计学意义(P0.05)。HepG2细胞与顺铂共培养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。SATB1 mRNA的表达随着顺铂浓度的增加而减少,其中5.0、10.0μg/ml顺铂组SATB1 mRNA的表达量与对照组差异均有统计学意义(P0.05)。结论:SATB1在三种肝癌细胞株中均有表达,顺铂可抑制HepG2细胞增殖和SATB1的表达,从而达到抑制肝癌细胞生长的目的。     

RNAi沉默STAT3基因联合mTOR抑制剂rapamycin诱导BEL-7402肝癌细胞凋亡

目的：探讨PI3K/AKT/mTOR和JAK/STAT3 2条信号转导途径共同作用对肝癌细胞凋亡的影响,为肝癌基因治疗提供依据。方法：选取对数生长期BEL-7402细胞,随机分为对照组、mTOR抑制剂rapamycin(Rapa)组、阴性质粒组、阴性质粒+ Rapa组、STAT3-siRNA质粒组和STAT3-siRNA 质粒+Rapa组,应用LipofectamineTM 2000转染试剂将含有目的基因的质粒转染BEL-7402细胞,同时应用rapamycin,分别采用流式细胞术和Hoechst33258荧光染色检测细胞凋亡率和形态学的变化,JC-1 荧光染色观察线粒体膜电位(ΔΨm)变化,Western blotting法检测活性caspase-3蛋白表达水平。结果：STAT3-siRNA+Rapa组细胞凋亡率为60.22%±0.87%,明显高于其他各组(P<0.05),且细胞ΔΨm明显降低(27.28%±1.82%,P<0.05);Hoechst33258荧光染色检测,见STAT3-siRNA有大量细胞出现细胞核聚集、边缘化和核
碎裂等典型细胞凋亡形态;Western blotting检测,STAT3-siRNA+Rapa组活性caspase-3蛋白表达水平明显高于其他各组（P<0.05）。结论：RNAi沉默BEL-7402肝癌细胞STAT3基因联合rapamycin可促进BEL-7402肝癌细胞的凋亡,二者具有明显的协同作用。     

Bcl-2短发夹状RNA对BEL-7402、Caco2细胞的生长抑制作用

目的:研究Bcl-2短发夹状RNA(short hairpin RNA,shRNA)序列的表达载体对肝癌细胞系BEL-7402和结肠癌细胞系Caco2生长的抑制作用.方法:将Bcl-2 shRNA序列克隆到携带绿色荧光蛋白基因的质粒Pgenesil-1载体,采用脂质体介导的转染方法将构建的Bcl-2shRNA表达质粒转入BEL-7402、Caco2细胞,同时设立阴性shRNA组、空载体组、脂质体组、空白组作为对照.通过倒置荧光显微镜和流式细胞仪观察细胞的转染效率,Western印迹法检测Bcl-2蛋白表达水平,MTT法测定细胞增殖情况.结果:Bcl-2 shRNA转染组、阴性shRNA组、空载体组的转染效率无显著差异.转染Bcl-2 shRNA后BEL-7402、Caco2细胞Bcl-2蛋白表达水平与转染阴性shRNA、空载体组、脂质体组和空白组相比均显著降低(P＜0.05),且Bcl-2 shRNA抑制Caco2细胞Bcl-2蛋白表达比BEL-7402细胞更为明显(P＜0.05).MTT测定显示转染Bcl-2 shRNA载体入BEL-7402、Caco2细胞在72、96 h细胞生长明显受到抑制,分别与转染阴性shRNA、空载体组、脂质体组和空白组比较,差异有显著性(P＜0.05).结论:Bcl-2 shRNA可特异性地抑制BEL-7402、Caco2细胞生长.     

紫杉醇、5-氟脲嘧啶抑制肝癌细胞BEL-7402生长和诱导凋亡的比较

目的 研究紫杉醇、5-氟脲嘧啶(5-Fu)抑制肝癌细胞BEL-7402增殖和诱导凋亡的效果。方法 采用ATP生物发光法检测肝癌细胞株的药物敏感性,以流式细胞术、形态学方法分析细胞凋亡和细胞周期。结果 BEL-7402对紫杉醇高度敏感,对5-Fu低度敏感,抑制作用均存在剂量、时间效应。紫杉醇组3种浓度诱导细胞凋亡率均明显高于无药对照组(P<0.05),但低于5-Fu组(P<0.01);紫杉醇组细胞死亡率显著高于5-Fu组(P<0.05)。紫杉醇诱导凋亡率随药物浓度降低而增加,而5-Fu诱导凋亡率随药物浓度降低而降低。结论 紫杉醇可抑制BEL-7402肝癌细胞增殖和诱导凋亡。5-Fu抑癌以诱导细胞凋亡为主,紫杉醇则以引起细胞坏死为主。