表阿霉素诱导人肝癌SMMC-7721细胞凋亡的实验研究

目的 进一步探讨表阿霉素治疗原发性肝癌的作用机理。方法 应用DNA电泳、电镜、流式细胞仪分析技术，观察表阿霉素诱导人肝癌SMMC－7721细胞凋亡模式。结果 0.1μg/ml表阿霉素作用细胞12、24、36、48小时及0.1、1.0、10.0、100μg/ml表阿霉素作用细胞24小时均可出现细胞凋亡现象，其诱导凋亡效率与剂量、时间呈正相关。结论 表阿霉素可诱导人肝癌SMMC－7721细胞凋亡而发挥抗肿瘤作用。     

莲房花青素诱导人肝癌细胞SMMC-7721凋亡的研究

目的研究莲房花青素对人肝癌细胞株SMMC-7721凋亡的影响,探讨其抗癌机制。方法以不同浓度的莲房花青素(LSPC)与人肝癌细胞株SMMC-7721细胞共培养,MTT法测定细胞增殖。结果 LSPC可体外抑制肝癌细胞生长,抑制率呈浓度和时间依赖性并随浓度增加而增高。结论莲房原花青素(LSPC)可能通过诱导细胞凋亡抑制人肝癌细胞增殖。     

丁酸钠诱导人肝癌SMMC-7721细胞凋亡作用的评价

通过观察丁酸钠 (Na B)对人肝癌 SMMC-772 1细胞抑制增殖和诱导凋亡作用 ,初步确定丁酸钠对体外培养人肝癌SMMC-772 1细胞的最适作用浓度。将丁酸钠以不同终浓度、不同时间作用于人肝癌 SMMC-772 1细胞 ,用华罗庚优选法确定实验浓度 ,采用 MTT比色法、倒置显微镜观察细胞增殖抑制 ;采用流式细胞术分析细胞凋亡率和细胞周期 ;电镜观察超微结构确定细胞凋亡情况。结果显示 ,丁酸钠对人肝癌 SMMC-772 1细胞生长的抑制呈剂量依赖和时间依赖 ,透射电镜观察到细胞皱缩、核质浓缩、核碎裂以及凋亡小体形成等凋亡特征的形态学改变。高浓度 (≥ 4mmol/L)时 ,细胞在 12 h迅速出现坏死 ,电镜下观察 ,正常细胞膜结构消失 ,线粒体肿胀、破裂。流式细胞术分析细胞阻滞于细胞周期的 G0 /G1期 ,S期比例明显减少 ,细胞增殖指数明显下降     

苦参碱诱导人肝癌细胞SMMC-7721凋亡的实验研究

目的研究不同浓度的苦参碱对人肝癌SMMC-7721细胞诱导凋亡的作用。方法将不同浓度的苦参碱作用于培养的SMMC-7721肝癌细胞,通过四氮噻唑蓝(MTT)比色法检测各浓度的药物对细胞的抑制增殖作用;光学显微镜、荧光显微镜下形态学观察;DNA琼脂糖凝胶电泳及流式细胞仪(FCM)研究分析其对肝癌细胞的诱导凋亡作用。结果浓度为2.01,4.02,6.04和8.05mmol·L-1苦参碱对SMMC-7721肝癌细胞都有不同程度的抑制增殖作用,抑制增殖作用随药物浓度的增加及作用时间的延长而加强(P<0.001)。光学显微镜、荧光显微镜下观察,发现细胞凋亡现象;DNA琼脂糖凝胶电泳可见DNA梯形条带;流式细胞仪(FCM)检测分析出现凋亡亚二倍体峰。结论苦参碱对肝癌细胞具有诱导凋亡作用,诱导作用具有明显的量效和时效关系。     

没食子酸诱导人肝癌细胞SMMC-7721凋亡机制的探讨

目的探讨没食子酸(gallic acid,GA)抑制人肝癌细胞SMMC-7721增殖的作用,揭示其促凋亡的相关分子机制。方法体外培养人肝癌细胞SMMC-7721,MTT法观察细胞在GA作用24、48、72 h后的增殖情况;用倒置显微镜观察细胞形态学的变化;透视电镜观察细胞内部结构变化;Annexin V-FITC/PI检测细胞凋亡;采用RT-PCR技术研究p53 mRNA的变化;应用Western blot法检测p53蛋白水平的表达。探讨GA对人肝癌细胞SMMC-7721的诱导凋亡作用及机制。结果剂量为6.25⁵0μmol·L-1GA作用SMMC-7721细胞48 h有明显的增殖抑制活性,引起核固缩、凝聚、碎裂,诱导细胞凋亡,并呈剂量依赖性;RT-PCR和Western blot结果显示,GA能升高p53 mRNA水平和p53蛋白表达。结论 GA可抑制人肝癌细胞SMMC-7721的增殖,诱导凋亡,可能与其上调肿瘤相关抑癌基因p53有关。     

富硒蚕蛹氨基酸诱导人肝癌细胞SMMC-7721凋亡的研究

目的　研究富硒蚕蛹氨基酸对人肝癌细胞SMMC 772 1的作用。方法　以人肝癌细胞SMMC 772 1为模型 ,采用原子荧光分光光度计测定蚕蛹硒含量 ,通过噻唑蓝(MTT)比色法检测细胞生长及活力 ,用倒置荧光显微镜观察细胞形态学变化 ,流式细胞仪研究细胞的凋亡及细胞周期变化。结果　①陕西紫阳县蚕蛹中硒的含量为普通蚕蛹硒含量的 2 15倍 ,②富硒蚕蛹氨基酸在 0 5、1 5和 2 5 μmol·L-1硒浓度下能显著性抑制肝癌细胞生长 ,并具有浓度和时间依赖性。亚硒酸钠对细胞生长的抑制作用不如富硒蚕蛹氨基酸。相反 ,普通蚕蛹氨基酸促进细胞的生长。③富硒蚕蛹氨基酸作用于细胞后 ,倒置荧光显微镜观察到细胞形态学变化及细胞存活率降低。④流式细胞仪检测到 0 5、1 5和2 5 μmol·L-1富硒蚕蛹氨基酸所致细胞凋亡及细胞周期的变化 ,该氨基酸能阻滞SMMC 772 1的细胞周期于G2 /M期 ,使G2 /M期细胞比例增加 ,而G0 /G1期细胞比例下降。结论　富硒蚕蛹氨基酸能诱导SMMC 772 1细胞的凋亡 ,其抗癌机制可能与其改变细胞周期进而诱导细胞凋亡相关联。     

10—羟基喜树碱对人肝癌Hep G2细胞的分化诱导作用

目的:研究羟基喜树碱HCPT对人肝癌Hep G2细胞分化诱导作用的机制。方法:用免疫细胞化学染色检测增殖细胞核抗原表达;流式细胞仪检测细胞周期和野生型p53蛋白表达;端粒重复扩增法检测端粒酶活性。结果:以诱导分化剂量(5-20μg·L~(-1))的HCPT处理6 d,人肝癌Hep G2细胞明显受阻于G_2/M期,PCNA阳性表达率降低。经HCPT 5μg·L~(-1)处理6 d,Hep G2细胞的野生型p53蛋白表达明显增强,但端粒酶活性没有改变。结论:HCPT诱导人肝癌Hep G2细胞分化的作用与细胞阻滞于G_2/M期、PCNA表达降低及野生型p53蛋白表达增强有关。     

汉防己甲素诱导人肝癌SMMC7721细胞凋亡的机制研究

目的:研究汉防己甲素(Tet)诱导人肝癌SMMC7721细胞凋亡的机制。方法:以4、6、8、10 mg/L Tet培养细胞24、48、72 h后,MTT法测定细胞活力并计算抑制率。6 mg/L Tet培养细胞24、48、72 h后,流式细胞仪检测细胞凋亡率;线粒体膜电位(JC-1)染色工作液染色,荧光显微镜下观察细胞JC-1情况;酶标仪测定半胱氨酸天冬氨酸蛋白水解酶3(Caspase-3)活性;Western blot法测定胞浆细胞色素C(Cyto-C)、Caspase-3原酶(Pro-caspase-3)蛋白表达。试验均设空白对照(常规培养基或培养0 h)。结果:4、6、8、10 mg/L Tet培养细胞24、48、72 h后对细胞生长有明显抑制作用,且呈时间、剂量依赖关系。与空白对照比较,6 mg/L Tet培养细胞24、48、72 h后细胞凋亡率升高,细胞JC-1降低,且呈时间依赖关系;6 mg/L Tet培养细胞24、48 h后Caspase-3活性增强;6 mg/L Tet培养细胞24 h后Cyto-C蛋白表达增强,Pro-caspase-3蛋白表达减弱,差异有统计学意义(P<0.05)。结论 :Tet可诱导SMMC7721细胞凋亡,其机制可能与线粒体凋亡途径的激活有关。     

10-羟基喜树碱的合成

喜树碱经H2O2氧化所制得的喜树碱N-氧化物,于酸性条件下经紫外线照射在10-位引入羟基,最后经柱色谱分离纯化得到纯度98%以上的目标化合物,收率33%.     

羟基喜树碱对胃癌细胞凋亡和细胞周期的影响

目的 探讨羟基喜树碱诱导胃癌细胞凋亡与细胞周期变化的关系.方法 用MTT法测定不同浓度的HCPT对胃癌细胞的生长抑制作用,用流式细胞仪测定一定浓度下不同作用时间细胞凋亡率和细胞周期的变化.结果 在3.125～50.0 μg/ml浓度范围内药物对细胞的抑制率随浓度的增加而增加;在相同浓度下,随时间的延长细胞的凋亡率也逐渐增加,0、12、24、48h的凋亡率为2.8%、8.5%、10.2%,13.3%,在24h内S期细胞减少而G0/G1细胞增多,第二个24h S期和G2/M的阻滞.结论羟基喜树碱可诱导胃癌细胞凋亡,其细胞凋亡与细胞周期分布有关.     

Reactive oxygen species accumulation contributes to gambogic acid-induced apoptosis in human hepatoma SMMC-7721 cells

It is reported that gambogic acid (GA), the main active compound of gamboge which is a dry resin extracted from Garcinia hanburyi tree, has potent antitumor activity both in vivo and in vitro. Activation of mitochondrial apoptotic pathway in cancer cells is one effective therapy for cancer treatment. In the present study, we focus on the effect of GA on induction of reactive oxygen species (ROS) accumulation and triggering the mitochondrial signaling pathway in human hepatoma SMMC-7721 cells. The results indicated that GA induced ROS accumulation and collapse of mitochondrial membrane potential in SMMC-7721 cells in a concentration-dependent manner and subsequently induced that release of Cytochrome c and apoptosis-inducing factor from mitochondria to cytosol, which inhibited ATP generation and induced apoptosis in the cells. Moreover, GA elevated the phosphorylation of c-Jun-N-terminal protein kinase (JNK) and p38, which was the downstream effect of ROS accumulation. Furthermore, N-acetylcysteine, a ROS production inhibitor, partly reversed the activation of JNK and p38 and the induction of apoptosis in GA-treated cells. Collectively, our study demonstrated that accumulation of ROS played an important role in GA-induced mitochondrial signaling pathway, which provided further theoretical support for the application of GA as a promising anticancer agent.     

Involvement of bax/bcl-2 in wogonin-induced apoptosis of human hepatoma cell line SMMC-7721

The molecular mechanisms of wogonin-induced apoptosis of human hepatoma SMMC-7721 cells are reported. Wogonin treatment resulted in significant inhibition of SMMC-7721 cells in a time-dependent and concentration-dependent manner. Typical morphological changes and apoptotic blebbing in SMMC-7721 cells were observed after treatment with 1x10(-4) mol/l wogonin for a period of 0-48 h. Flow cytometry and Annexin-V/propidium iodide double-staining experiments revealed a dramatic increase in the number of apoptotic and G0/G1 phase cells after wogonin treatment. The proapoptotic activity of wogonin is attributed to its ability to modulate the expression of bcl-2 and bax proteins. It is observed that the expression of bax protein is dramatically increased whereas the synthesis of bc1-2 protein is significantly decreased when cells are treated with wogonin. The results presented in this paper suggested an important relationship between gene regulation and wogonin-induced apoptosis, and indicated the possibility of developing naturally occurring monoflavonoids as novel anticancer agents for better management of human cancers.     

对甲氧基肉桂醛左氧氟沙星酰腙诱导人肝癌SMMC-7721细胞凋亡的作用

目的探讨喹诺酮酰腙类化合物诱导人肝癌SMMC-7721细胞凋亡的作用。方法用不同浓度的对甲氧基肉桂醛左氧氟酰腙(FQ-10)与SMMC-7721细胞体外培养。MTT法检测FQ-10对SMMC-7721细胞的增殖抑制作用;Hoechst33258/PI双染荧光染色法、TUNEL法及琼脂糖凝胶电泳检测细胞凋亡变化;高内涵活细胞成像系统测定细胞线粒体膜电位(△ψm)变化;Western blot方法测定caspase-9、caspase-8、caspase-3、p53、Bcl-2、Bax蛋白表达。结果 FQ-10在0.625～10.00μmol.L-1的浓度范围能抑制细胞增殖,呈时间、浓度依赖性;作用于细胞24 h的IC50值是4.40μmol.L-1;各组FQ-10作用24 h后,细胞凋亡率高于对照组(P<0.05);琼脂糖凝胶电泳可见凋亡细胞典型的梯状DNA条带,并伴有线粒体膜电位降低。荧光染色观察细胞形态学变化,显示凋亡细胞染色质凝集,细胞核碎裂成碎片等典型细胞凋亡特征性变化,晚期凋亡细胞可见特异性PI染色。与对照组比较,FQ-10作用后p53、Bax、caspase-9、caspase-3蛋白表达量增加,其中caspase-9、caspase-3活性裂解片段明显增加,caspase-8无变化,而Bcl-2蛋白表达水平下降。结论对甲氧基肉桂醛左氧氟酰腙能够激活线粒体凋亡通路,诱导人肝癌细胞凋亡。     

玉米须多糖诱导人肝癌SMMC-7721细胞凋亡的研究

目的:观察不同浓度的玉米须多糖(stigma maydis polysaccharide SMPS)对肝癌SMMC-7721细胞作用的影响.方法:将玉米须多糖以不同浓度和时间作用于肝癌SMMC-7721细胞,采用 MTT比色法观察细胞毒性;应用HE染色法观察凋亡细胞的形态;原位末端标记法(TUNEL法)检测细胞凋亡率.结果:玉米须多糖以剂量依赖和时间依赖的方式抑制SMMC-7721细胞的生长.HE染色观察到凋亡细胞的形态学改变.结论:玉米须多糖抑制SMMC-7721细胞的增殖,诱导细胞凋亡.为临床治疗肝癌提供理论依据.     

Mechanism of apoptotosis induced by ortho-topolin riboside in human hepatoma cell line SMMC-7721

The naturally occurring cytokinin, ortho-topolin riboside (oTR), has been recently reported to have a strong anticancer effect. However, the molecular mechanism has not been elucidated. From our research we found that oTR strongly inhibited the proliferation of SMMC-7721 cells inducing apoptosis. After oTR treatment, up-regulation of the protein levels of pro-apoptotic Bax and the down-regulation of the anti-apoptotic proteins, Bcl-2 and Bcl-xL was observed, leading to the loss of mitochondrial membrane potential, the release of cytochrome c from the mitochondria into the cytosol, the downstream activation of caspase-9 and caspase-3, as well as the cleavage of poly ADP-ribose-polymerase (PARP), the effect of apoptosis could be blocked by the pan-specific caspase inhibitor z-VAD-fmk and caspase-9-specific inhibitor z-LEHD-fmk. Moreover, oTR was shown to inhibit the activation of the extracellular signal-regulated kinase-1/2 (ERK_1/2) as well as the Akt pathway. These results suggest that oTR interferes with the mitogen-activated protein kinase (MAPK) and Akt pathways and induces the apoptosis of human SMMC-7721 cells through the activation of intrinsic mitochondria-mediated pathways. However, the apoptosis was completely prevented when cells were treated with A-134974, an inhibitor of adenosine kinase, it indicated that the intracellular phosphorylation of oTR is necessary for its cytotoxic effects to SMMC-7721 cells.     

Induction of apoptosis by chelerythrine chloride through mitochondrial pathway and Bcl-2 family proteins in human hepatoma SMMC-7721 Cell

The objective of this study was to evaluate the antitumor activity of chelerythrine chloride (CHE) and investigate its potential apoptotic induction mechanism in SMMC-7721 cells. Our results suggested that the proliferation of SMMC-7721 cells was inhibited by CHE in a time and dose dependent manner, with a significant accumulation in S phase, and the cells exhibited typical apoptotic features. Moreover, CHE remarkably induced apoptosis by disruption of the mitochondrial membrane potential, release of Cyt-c, activation of caspase-3, and cleavage of poly-ADP-ribose polymerase in a dose dependent manner. Furthermore, the expression of Bcl-xl was downregulated while Bax and Bid expression was upregulated, and no variation was found for Bcl-2. These results indicated that CHE may play an important role in suppression of tumor growth by inducing apoptosis in human hepatoma cells via the activation of a mitochondrial pathway and regulating the expression of Bcl-2 family proteins.     

新型金属铜络合物对SMMC-7721细胞增殖与凋亡的影响

目的研究新型金属铜络合物(N-Cu)在体外对人肝癌SMMC-7721细胞增殖与凋亡的影响及其作用机制。方法将不同浓度的N-Cu(0.3～24μmol.L-1)作用于体外培养的SMMC-7721细胞,应用MTT法检测细胞生长抑制率,FCM法检测细胞周期及凋亡率,RT-PCR和Western blot法检测细胞中Bcl-2、Bax、Caspase-3 mRNA和蛋白表达的变化。结果 N-Cu可明显抑制SMMC-7721细胞的增殖,呈明显的量效与时效关系。随着药物浓度的增加,G0/G1期的细胞比率上升,G2/M和S期细胞比率下降,并促进凋亡率增加。N-Cu可上调细胞中Bax、Caspase-3基因及蛋白的表达,抑制Bcl-2基因及蛋白的表达,且均呈剂量依赖性。结论一定浓度的N-Cu可抑制SMMC-7721细胞的增殖并诱导其凋亡,阻滞细胞周期于G0/G1期。上调Bax、Caspase-3基因及蛋白的表达,降低Bcl-2/Bax比值,可能是其诱导细胞凋亡的重要机制。