鲎素诱导HL-60细胞凋亡的机制探讨

目的 研究鲎素诱导HL-60细胞凋亡时,半胱氨酸蛋白酶(Caspases)活性的变化,探讨鲎素诱导HL-60细胞凋亡的可能机制.方法 以鲎素20 μg/ml处理HL-60细胞0～24 h.流式细胞仪检测线粒体膜电位.Western blot法和发色底物法检测Caspase-3、Caspase-6、Caspase-8和Caspase-9活性变化.Western blot法检测胞质中细胞色素C的变化.结果 鲎素处理HL-60细胞后,线粒体膜电位下降.Caspase-3、Caspase-6、Caspase-8和Caspase-9被激活,呈时间依赖性改变.鲎素处理HL-60细胞6 h Caspase-8活性最高,而Caspase-9在12 h活性最高,Caspase-6活性在18 h达峰值,Caspase-3活性峰值时间在24 h后.胞质中细胞色素C含量呈时间依赖性增加.结论 鲎素诱导HL-60细胞凋亡可能是多途径的,至少与线粒体途径和死亡受体途径相关.     

甘草酸苷对肝癌细胞SMCC-7721凋亡的诱导作用

目的 探讨甘草酸苷对肝癌细胞SMCC-7721凋亡诱导作用及相关机制.方法 以甘草酸苷(0、10、30、100μg/mL)处理肝癌细胞SMCC-7721 48 h后,咪唑蓝(MTT)法检测肝癌细胞活力的影响;流式细胞术检测细胞凋亡和线粒体膜电位;紫外分光光度法检测细胞中含半胱氨酸的天冬氨酸蛋白水解酶3(Caspase-3)、Caspase-9活性的影响;Western blot分析线粒体途径中相关蛋白p53、细胞色素C(CytC)、B淋巴细胞瘤-2(Bcl-2)和Bcl-2相关蛋白(Bax)的表达.结果 与阴性对照比较,10、30、100 μg/mL甘草酸苷可显著降低细胞的活力(P＜0.01),诱导细胞凋亡(P＜0.01),促进线粒体膜电位去极化(P＜0.01),抑制肝癌细胞SMCC-7721Caspase-3、Caspase-9活性(P＜0.01),并上调p53、CytC、Bax的表达(P＜0.01),下调Bcl-2的表达(P＜0.01),且作用呈现浓度依赖关系.结论 甘草酸苷可通过线粒体途径诱导肝癌细胞SMCC-7721凋亡.     

胡桃醌对人肝癌BEL-7402细胞亚显微结构的影响

目的 了解胡桃醌对人肝癌BEL-7402细胞亚显微结构的影响.方法 12.5 μmol/L胡桃醌作用于BEL-7402细胞24h后固定,分别行HE染色、考马斯亮蓝染色、扫描电镜及透射电镜样品制备.结果 12.5 μmol/L胡桃醌处理组细胞形态和细胞骨架发生改变.扫描电镜结果显示BEL-7402细胞胞体体积缩小,与周围细胞群脱离,表面微绒毛卷曲、畸变、小球结构逐渐增多,细胞间连接逐渐断裂,细胞间隙增宽,有凋亡小体形成.透射电镜结果显示胡桃醌作用BEL-7402细胞24 h后,细胞内质网扩大,线粒体结构疏松,胞核核仁裂解,凋亡小体形成.结论 胡桃醌能有效改变人肝癌BEL-7402细胞亚显微结构,诱导细胞凋亡.     

亚砷酸对人肝癌细胞凋亡及ERK-1蛋白表达的影响

目的探讨亚砷酸对人肝癌细胞BEL-7402凋亡及ERK-1蛋白表达的影响.方法通过体外细胞培养,用流式细胞术观察BEL-7402细胞周期及凋亡率变化;HE染色法、荧光显微镜观察细胞的凋亡形态变化;并用免疫组化法检测细胞ERK-1蛋白的表达.结果亚砷酸(1.0～8.0 μmol/L)能诱导BEL-7402细胞凋亡并阻滞细胞周期于S、G2/M期,呈剂量依赖性;亚砷酸(8.0 μmol/L)作用BEL-7402细胞48 h后, HE染色、荧光显微镜观察可见BEL-7402细胞呈现明显的凋亡形态改变;免疫组化法检测发现8.0 μmol/L的亚砷酸作用48 h 后BEL-7402细胞的ERK-1蛋白表达明显减弱. 结论亚砷酸体外有诱导人肝癌细胞凋亡及降低ERK-1蛋白表达的作用.     

新型钌配合物通过内源性线粒体凋亡通路诱导Bel-7402细胞凋亡的机制

目的 研究钌配合物Ru-HMIP对肝癌细胞Bel-7402的抑制作用及其机制.方法 MTI法检测RuHMIP对Bel-7402细胞的杀伤作用;流式细胞术检测其诱导细胞凋亡情况;JC-1荧光探针检测线粒体膜电位;DCFH-DA荧光探针检测细胞内活性氧(ROS);Western blot检测细胞凋亡相关蛋白.结果 RuHMIP对Bel-7402细胞有较强的杀伤效果;其对细胞毒性作用是通过诱导细胞凋亡方式;Ru-HMIP在Bel-7402细胞中产生过量ROS,并且这种作用及其细胞毒性都可被还原剂乙酰半胱氨酸(NAC)所阻断.Ru-HMIP可以破坏Bel-7402细胞线粒体膜电位;上调Bax,下调Bcl-2,同时激活Caspase-9及Caspase-3.结论 Ru-HMIP可以在体外有效抑制Bel-7402细胞增殖,其作用机制是在细胞内诱发过量ROS,继而通过内源性线粒体凋亡通路诱导细胞凋亡.     

肿瘤坏死因子相关凋亡诱导配体在B淋巴瘤细胞株中的敏感性及诱导细胞凋亡机制

目的 探讨肿瘤坏死因子相关凋亡诱导配体(TRAIL)在B淋巴瘤细胞株中的敏感性及TRAIL通过线粒体信号通路诱导人B淋巴瘤细胞株Ramos凋亡的机制.方法 采用CCK-8法检测肿瘤细胞增殖,流式细胞术分析细胞线粒体膜电位、细胞表面受体DR4/DR5表达及细胞凋亡率变化,并用Western Blot测定Ramos细胞经TRAIL作用24 h后相关凋亡蛋白的表达水平.结果 供试的4株B淋巴瘤细胞中,Ramos细胞为TRAIL敏感株,Ramos细胞表面受体DR4/DR5表达水平明显高于TRAIL耐药株;TRAIL抑制Ramos细胞增殖通过诱导细胞凋亡介导;细胞调亡伴随线粒体膜电位明显变化;Western Blot免疫印迹结果显示,药物作用后,细胞内相关凋亡信号分子包括Caspase-9,Caspase-3,PARP蛋白等均明显活化.结论 4株B淋巴瘤细胞株对TRAIL敏感性不同,并与DR4/DR5表达相关;TRAIL抑制Ramos细胞增殖,诱导细胞凋亡,引起线粒体膜电位明显下降,活化Caspase-9及下游凋亡蛋白;线粒体调亡途径是介导TRAIL诱导Ramos细胞凋亡的途径之一.     

二十碳五烯酸对人肝癌HepG2凋亡细胞线粒体的影响

目的:探讨二十碳五烯酸(EPA)诱导人肝癌HepG2细胞凋亡及其对线粒体的影响. 方法:HepG2细胞与经EPA处理后,DNA Ladder检测细胞凋亡的发生,应用线粒体荧光探针和四唑盐(MTT)比色法分析细胞线粒体数量和功能,应用免疫印迹法和特异性底物检测HepG2细胞Caspase-9蛋白酶的表达和活性. 结果:终浓度为120 μmol/L EPA处理HepG2细胞24 h后,可以检测到凋亡标志性的DNA梯形带;细胞线粒体数量减少,MTT比色法检测A值为0.173±0.065(P＜0.01),提示线粒体功能降低;线粒体相关凋亡级联反应的启动分子Caspase-9蛋白表达增加,Caspase-9酶活性增强至75.4±4.8,与未经EPA处理HepG2细胞相比差异有统计学意义(P＜0.01). 结论:EPA可能通过损伤线粒体诱导人肝癌HepG2细胞凋亡.     

半枝莲提取物诱导结肠癌HT-29细胞凋亡的机制研究

目的探讨半枝莲提取物在体外诱导结肠癌HT-29细胞株凋亡的作用机制。方法采用人结肠癌细胞HT-29常规体外培养,随机设定对照组和不同浓度半枝莲提取物组,干预24 h。倒置显微镜观察细胞形态变化,MTT法测定不同浓度半枝莲提取物对HT-29细胞增殖的影响,DNA Ladder试剂盒检测药物作用后细胞凋亡情况,AnnexinV-FITC/PI双标记流式细胞术检测细胞凋亡率,JC-1试剂盒检测线粒体膜电位变化,应用比色法分析Caspase-9和Caspase-3的活化情况。结果半枝莲提取物干预HT-29细胞24 h后,HT-29细胞密度明显减少、细胞变小,可明显抑制HT-29细胞增殖,细胞凋亡增加,线粒体膜电位丧失,具有显著地剂量依赖,并出现明显的DNA Lad-der条带;Caspase-9和Caspase-3的活化随着药物浓度的升高而增加。结论半枝莲提取物能通过线粒体通路诱导人结肠癌HT-29细胞凋亡而发挥其抗肿瘤作用。     

冬凌草甲素通过线粒体途径诱导人胆囊癌GBC-SD细胞凋亡

目的 研究冬凌草甲素诱导人胆囊癌GBC-SD细胞的凋亡作用及其机制.方法 MTS法检测冬凌草甲素对GBC-SD细胞的生长抑制作用;瑞氏染色法观察细胞的形态学变化;流式细胞仪检测细胞凋亡率、线粒体膜电位改变、caspase-3活性变化;Western blot检测caspase-9活化情况.结果 冬凌草甲素能显著抑制GBC-SD细胞增殖,呈时间剂量依赖性(P＜0.05).细胞形态学观察可见冬凌草甲素可诱导细胞发生凋亡.流式细胞仪检测结果显示28 μmol/L药物处理GBC-SD细胞24h后,细胞凋亡率为51.28％±2.65％.随着药物浓度增加,GBC-SD细胞线粒体膜电位逐渐下降而caspase-3活性逐渐增强,56μmol/L组caspase-3活性是对照组的11倍.Western blot分析结果显示caspase-9酶原被激活,且活化条带随药物浓度的增加而增强.结论 冬凌草甲素可能通过细胞线粒体膜电位下降激活caspase-3并最终诱导GBC-SD细胞凋亡.     

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。     

Effect of tanshinone IIA on the growth behavior of human hepatoma cell line BEL-7402 in vitro and its mechanism]

OBJECTIVE: To investigate the effect of tanshinone IIA on the growth behavior of human hepatoma cell line BEL-7402 in vitro and explore the mechanism. METHODS: Human hepatoma cell line BEL-7402 was exposed to tanshinoneIIA at different concentrations for 72 h, and the suppression of the cell growth was observed under inverted-phase contrast microscope. Apoptosis-related alterations in the cell morphology and biochemistry were examined under fluorescence microscope and transmission electron microscope (TEM) and by DNA agarose gel electrophoresis, and the apoptotic rate was quantified by flow cytometry (FCM). RESULTS: After treatment with 0-10 microg/ml tanshinone IIA for 72 h, the proliferation of BEL-7402 cells was significantly suppressed, and cell apoptosis occurred characterized by cell shrinkage, nuclear chromatin condensation and fragmentation, formation of membrane blebs and apoptotic bodies as observed under fluorescence microscope and TEM. DNA ladder was presented in DNA electrophoresis. FCM analysis yielded the cell apoptotic rates of (20.78+/-2.17) %, (24.64+/-2.07) %, (31.47+/-3.86) %, (43.65+/-4.04) % and (52.36+/-3.75) % at tanshinone IIA concentrations of 0.5, 1.0, 2.0, 5.0 and 10.0 microg/ml respectively, all significantly higher than those of the control group [(2.37+/-0.29)%]. CONCLUSION: Tanshinone IIA can inhibit the growth of human hepatoma BEL-7402 cells possibly through the mechanism of apoptosis induction.     

三氮唑席夫碱衍生物对肝癌细胞裂亡的影响

目的:研究3-吡啶-3-基-4-[(4-甲氧基-苯亚甲基)氨基]-5-甲硫基-1,2,4-三唑(LH-38)对肝癌细胞BEL-7402裂亡的作用。方法:BEL-7402细胞常规培养于RPMI-1640培养液中,细胞生长至对数生长期加LH-38(终浓度分别为1×10-4mol/L和1×10-5mol/L),连续培养48 h或72 h。四甲基偶氮唑蓝(MTT)比色法检测细胞增殖,荧光染料Hoechst33258和PI联染检测细胞死亡,免疫细胞化学法检测激活型Caspase-3表达。结果:LH-38抑制BEL-7402细胞增殖并呈浓度依赖关系,IC50为3.0×10-4mol/L;1×10-5mol/L浓度的LH-38处理细胞72 h,镜下可见多倍体细胞明显增多,可见微核或多核细胞染色体自发性的凝集,有丝分裂异常,存活或死亡的多核或单核巨细胞同时存在,存活细胞的激活型Caspase-3表达阴性;1×10-4mol/L浓度LH-38处理细胞48 h,可明显诱导细胞凋亡。结论:不同浓度LH-38可以引起人肝癌细胞BEL-7402细胞裂亡或细胞凋亡,即两种不同形式的细胞死亡。     

Total saponin from root of Actinidia Valvata Dunn prevents the metastasis of human hepatocellular carcinoma cells

Objective:To extract the active component from the root of Actinidia valvata Dunn and to investigate the effects on hepatocellular carcinoma(HCC) cells in vitro.Methods:Total saponin was extracted from the root of A.valvata(TSAVD).HCC cells,such as BEL-7402,HepG2,PLC,SMMC-7721,MHCC-97-H, and MHCC-97-L,were treated with TSAVD in 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenytetrazolium bromide(MTT) assay.BEL-7402 and MHCC-97-H cells were also treated respectively with TSAVD at different concentrations for 24 h in wound healing and adhesion assays,and the effects of TSAVD on BEL-7402 and MHCC-97-H cells mobility and adhesion abilities were observed.Meanwhile,the effects of TSAVD on invasion and migration of BEL-7402 and MHCC-97-H cells were also investigated by transwell chamber in invasion and migration assays. Results:TSAVD at 1.5 mg/mL inhibited BEL-7402 cell proliferation with inhibition ratios(IRs) of 61.08%,74.12%, 84.55%at 24,48,and 72 h,respectively.Meanwhile,TSAVD inhibited MHCC-97-H proliferation in a concentrationdependent manner from 1.5 to 0.5 mg/mL,with the IR of 36%at 1.5 mg/mL at 24 h.For SMMC-7721,PLC, and HepG2,the IR was lower than 30%at 1.5 mg/mL at 24 h.In the wound healing assay,mobility abilities of BEL-7402 and MHCC-97-H cells in TSAVD treated groups were significantly weaker than those of the control group.After pretreatment for 24 h with TSAVD,adhesion abilities were reduced in both MHCC-97-H and BEL-7402 cells,with IRs of 48.50%±4.86%and 49.85%±5.25%at 200 |xg/mL.The IRs of MHCC-97-H and BEL-7402 cells in the migration assay were 49.13%±2.91%and 79.37%±0.09%at 200μg/mL In the invasion assay,IRs were 69.78%±4.88%and 82.48%±0.25%at 200μg/mL Conclusions:Of all HCC cells,the highest inhibition by TSAVD was seen for BEL-7402 proliferation.TSAVD could restrain adhesion,invasion,mobility,and migration abilities of BEL-7402 and MHCC-97-H cells in vitro.     

雄黄抗人肝癌BEL-7402细胞作用

目的:观察雄黄体外抗人肝癌BEL-7402细胞作用和作用机制.方法:采用MTS法和细胞克隆实验法观察雄黄对BEL-7402细胞增殖的影响,应用PI/Hoechest33258双染法和流式细胞仪检测细胞凋亡,荧光分光光度计检测细胞内钙和线粒体膜电位.结果:与阴性对照组比,雄黄能剂量依赖性地抑制BEL-7402细胞的生长和...     

去甲斑蝥素诱导肝癌细胞凋亡的实验观察

目的 观察去甲斑蝥素(NCTD)诱导肝癌细胞凋亡的分子学机制,为合理应用NCTD治疗肝细胞肝癌提供理论基础.方法 对肝癌细胞株SMMC-7721,BEL-7402进行体外培养,应用不同浓度的NCTD(3、10、30μg/ml)处理肝癌细胞,采用MTT方法检测细胞生存率,锥虫蓝拒染法检测细胞的死亡率,流式细胞仪检测细胞的凋亡率,Western印迹检测半胱氨酸天门冬氨酸蛋白酶(caspase)和聚腺苷二磷酸核糖聚合酶(PARP)蛋白,以及Bcl-2家族蛋白的表达.结果 MTT检测显示NCTD处理24、48和72 h后SMMC-7721细胞IC50分别为12、6和1.6μg/ml,BEL-7402细胞IC50分别为10、4和2 μg/ml;锥虫蓝拒染法结果显示,浓度为3、10、30 μg/ml的NCTD处理24 h后,SMMC-7721细胞的死细胞率分别为16.89%、46.16%、72.13%,均显著高于未处理对照组的死细胞率3.34%(P＜0.01);BEL-7402细胞的死细胞率分别为19.59%、50.10%、90.31%,均显著高于未处理对照组的死细胞率2.88%(P＜0.01).流式细胞仪检测显示,NCTD 10 μg/ml处理12 h,SMMC-7721细胞凋亡率达到27%,较未处理对照组(7%)升高20%,BEL-7402细胞凋亡率达到30%,较未处理对照组(8%)升高22%;Western印迹结果显示,NCTD 10μg/ml处理8、14和24 h后,在两株肝癌细胞均检测到caspase-9,-3活化,PARP蛋白裂解,以及Bcl-2、Bcl-XL和Mcl-1蛋白的表达下调.结论 结果提示NCTD具有较强的抑制肝癌细胞生存和诱导肝癌细胞凋亡作用.NCTD的抗肝癌作用机理可能是通过诱导多个Bcl-2抑凋亡家族蛋白表达下调,激活内源性线粒体凋亡通路,诱导肝癌细胞发生凋亡.     

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.     

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。     

Rabbit annulus fibrosus cell apoptosis induced by mechanical overload via a mitochondrial apoptotic pathway

In order to investigate the apoptotic pathway of rabbit annulus fibrosus(AF) cells induced by mechanical overload,an experimental air-pressure model was established in this study to pressurize the rabbit AF cells in vitro.Cells were randomly divided into five groups in which the cells were exposed to a continuous pressure of 1.1 MPa for different lengths of time(0,5,12,24 and 36 h).The cell proliferation and apoptosis were detected by cell counting kit-8(CCK-8) assay and flow cytometry;the alterations in mi...     

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。