双萘酰亚胺类化合物诱导SMMC-7721细胞凋亡的研究

目的 观察双萘酰亚胺类化合物(C8)对人肝癌细胞株SMMC-7721细胞的作用. 方法 四甲基偶氮唑盐法检测C8对SMMC 7721细胞的抑制情况;流式细胞术检测细胞周期和凋亡率;Western blot检测Bcl 2蛋白表达量;流式细胞术分析细胞内Bcl 2蛋白量;酶联免疫法检测Caspase9和Caspase 3表达量. 结果 C8抑制SMMC 7721细胞增殖,半数抑制浓度为15 umol/L.C8作用浓度在10,15、20 umol/L时,SMMC 7721细胞的凋亡比例分别为16.8%、29.4%和35.8%,对照组为2.1%,SMMC 7721细胞的凋亡率明显高于对照组,P<0.01.细胞内Bcl-2蛋白表达水平下降.酶联免疫检测结果表明Caspase 9和Caspase 3被活化.结论 C8可诱导人肝癌SMMC 7721细胞的凋亡,为抗肿瘤药物的研究提供新的化合物.     

人肝癌SMMC-7721细胞受体介导内吞高密度脂蛋白-2的逆向胞饮作用

荧光素异硫氰酸酯标记高密度脂蛋白-2保持天然高密度脂蛋白-2的生物活性。人肝癌SMMC-7721细胞与荧光标记无载脂蛋白E-高密度脂蛋白-2在37℃培养3h左右,细胞结合与内吞的荧光强度分别为13.5±0.8和9.2±0.5(±s土)。细胞进一步在37℃培养2h细胞释放的三氯醋酸沉淀和三氯醋酸可溶性荧光强度分别为5.1±0.4和0.67±0.17.4℃培养2h,细胞释放三氯醋酸沉淀荧光强度为0.41±0.16。结果提示:①细胞内吞高密度脂蛋白-2没有经过溶酶体分解途径;②细胞释放高密度脂蛋白-2载脂蛋白是一种取决于温度的逆向胞饮机制。     

Inhibitory effect of emodin on human hepatoma cell line SMMC-7721 and its mechanism

BackgroundDa Huang (Radix et Rhizoma Rhei) is the dried root or rhizome of Rheum palmatum L., Rheum tanguticum Maxim ex Balf. or Rheum officinale Braill of family Polygonaceae. It has heat clearing, damp drying, fire purging and toxin removing effects. Because of its definite curative efficacy, it has been widely applied in clinical settings.ObjectiveTo study the inhibitory effect of emodin on human hepatoma cell line SMMC-7721 and its mechanism.MethodsMTT assay, flow cytometry and electron microscopy were used to investigate the inhibitory effect of different concentrations of emodin on human hepatoma cell line SMMC-7721.Results12 h, 24 h and 48 h after the action of 20, 40 and 80 umol/L emodin on SMMC-7721 cells, the proliferation of human hepatoma SMMC-7721 cells was inhibited; the inhibitory effects showed time-and concentration-dependence. 48 h after the action of different concentrations of emodin on SMMC-7721 cells, cells in G2/M phase increased significantly, while the proportion of S phase cells gradually declined.ConclusionEmodin can inhibit human hepatoma cell line SMMC-7721.     

苦参素注射液联合顺铂对人肝癌SMMC-7721细胞端粒酶活性及wtp53、hTERT mRNA表达的影响

目的:观察苦参素注射液联合顺铂(DDP)对人肝癌SMMC-7721细胞端粒酶活性、野生型p53(wtp53)、端粒酶逆转录酶(h TERT)m RNA表达的影响。方法:将Dulbecco改良Eagle培养基培养的人肝癌SMMC-7721细胞分为苦参素组、DDP组、联合组和对照组。苦参素组低、中、高质量浓度分别为0.75、1.5、3.0 mg/ml,DDP组低、中、高质量浓度分别为1、2、4 mg/ml,联合组浓度按两药联合用药1∶1的比例应用,对照组加入200μl磷酸缓冲盐溶液(PBS),不给予药物干预。观察4组人肝癌SMMC-7721细胞凋亡率及药物间的相互作用,端粒酶活性吸光度差值(ΔA),wtp53和h TERTm RNA相对表达量。结果:联合组人肝癌SMMC-7721细胞凋亡率>苦参素组>DDP组>对照组,4组比较差异有统计学意义(P<0.01),q值提示苦参素与DDP存在单纯相加或协同作用。苦参素组、DDP组及联合组SMMC-7721细胞端粒酶活性ΔA、h TERTm RNA均显著低于对照组,且联合组DDP组>苦参素组,差异均有统计学意义(P<0.05)。结论:苦参素注射液联合DDP可增加人肝癌SMMC-7721细胞的凋亡,其机制可能与wtp53表达上调、h TERTm RNA表达下调,从而影响端粒酶活性有关。     

Holotransferrin enhances selective anticancer activity of artemisinin against human hepatocellular carcinoma cells

Artemisinin, also termed qinghaosu, is extracted from the traditional Chinese medicine ar- temesia annua L. （the blue-green herb） in the early 1970s, which has been confirmed for effectively treating malaria, Additionally, emerging data prove that artemisinin exhibits anti-cancer effects against many types of cancers such as leukemia, melanoma, etc. Artemisinin becomes cytotoxic in the presence of ferrous iron. Since iron influx is high in cancer cells, artemisinin and its analogs selectively kill can- cer cells with increased intracellular iron concentrations. This study is aimed to investigate the selective inhibitory effects of artemisinin on SMMC-7721 cells in vitro and determine the effect of holotransfer- fin, which increases the concentration of ferrous iron in cancer cells, combined with artemisinin on the anticancer activity. MTT assay was used for assessing the proliferation of SMMC-7721 cells treated with artemisinin. The induction of apoptosis and inhibition of colony formation in SMMC-7721 cells treated with artemisinin were determined by TdT-mediated dUTP nick end labeling （TUNEL） and col- ony formation assay, respectively. The results showed that artemisinin at various concentrations signifi- cantly inhibited growth, colony formation and cell viability of SMMC-7721 cells （P〈0.05）, likely due to induction of apoptosis of SMMC-7721 cells. Of interest, it was found that incubation of artemisinin combined with holotransferrin sensitized the growth inhibitory effect of artemisinin on SMMC-7721 cells （P〈0.01）. Our data suggest that treatment with artemisinin leads to inhibition of viability and pro- liferation, and apoptosis of SMMC-7721 ceils. Furthermore, we observed that holotransferrin signifi- cantly enhanced the anti-cancer activity of artemisinin. This study may provide a potential therapeutic choice for liver cancer.     

油茶籽提取物的体外抗癌活性

目的 探讨油茶籽的95%乙醇提取物和水提取物对两种癌细胞增殖的抑制作用.方法 常规传代培养人乳腺痛细胞(MCF-7)和人肝癌细胞(SMMC-7721),采用噻唑蓝(MTT)法测定细胞的活性.结果 油茶籽乙醇提取物和水提取物对体外培养的MCF-7和SMMC-7721细胞在7.82～500.00 μg·ml-1剂量内均具有剂量依赖性的抑制作用,与空白对照组比较,差异显著(P<0.05);阳性对照药10 μg·ml-1甲氨喋呤和硫酸长春新碱亦可显著地抑制两种细胞的增殖.体外增殖抑制作用的强弱为油茶籽乙醇提取物>水提取物.结论 两种提取物对MCF-7和SMMC-7721细胞具有明显的抑制作用.     

天然二萜类化合物的抗肿瘤活性

采用ＭＴＴ快速比色法，以长春碱（Ｖｉｎｂｌａｓｔｉｎｅ，ＶＬＢ）为阳性对照，研究了３６种从中草药中分离提取的天然二萜类化合物对三种不同癌细胞（肝癌ＳＭＭＣ－７７２１、肺腺癌Ｌ（３４２）、胃腺癌ＭＣｃ８０－３）生长的抑制活性。结果表明：６种二萜类化合物抗肿瘤活性强度与其化学结构密切相关；其中Ｅ（１８）、Ｅ（２１）和Ｅ（１３）的抑瘤活性强度比长春碱强，顺序为：Ｅ（１８）～Ｅ（２１）＞Ｅ（１３）＞ＶＬＢ＞Ｅ（１９）＞Ｖ８＞Ｅ（１２）；酯酰化取代基是影响其抗肿瘤活性强度的主要官能团。     

葡萄球菌肠毒素B对人肝癌和肺癌传代细胞株细胞增殖的影响

目的探讨葡萄球菌肠毒素B(SEB)对人肝癌传代细胞株SMMC7721和人肺癌传代细胞株D6细胞增殖的抑制作用.方法采用MTT比色法,检测不同浓度和作用时间的SEB对人肝癌传代细胞株SMMC7721和人肺癌传代细胞株D6增殖的抑制作用.结果应用不同浓度的SEB3d后,对SMMC7721细胞和D6细胞的增殖均产生抑制作用;5、10、20ng/ml的SEB均能抑制SMMC7721细胞和D6细胞的体外增殖,抑制的程度与SEB的浓度、作用时间有关.结论葡萄球菌肠毒素B对人肝癌传代细胞株SMMC7721和人肺癌传代细胞株D6能产生一定的增殖抑制作用.     

雷氏大疣蛛毒素对人肝癌细胞SMMC-7721细胞增殖及细胞周期的影响

目的 探讨雷氏大疣蛛Macrothele raveni毒素对人肝癌细胞SMMC-7721增殖及细胞周期的抑制作用，进一步探讨其作用的分子机制。方法 采用MTT法测定雷氏大疣蛛毒素对SMMC一7721细胞增殖作用的影响；采用[^3H]TdR掺入法检测雷氏大疣蛛毒素作用前后SMMC7721细胞DNA合成的变化；采用流式细胞术（FCM）探讨雷氏大疣蛛毒素对SMMC-7721细胞凋亡率和细胞周期的影响；采用Western Blot方法研究雷氏大疣蛛毒素对细胞周期相关c-myc蛋白表达的影响。结果 MTT方法表明雷氏大疣蛛毒素对SMMC-7721细胞增殖有较强的抑制作用（P〈0．05），时效和量效关系良好。雷氏大疣蛛毒素可以抑制SMMC-7721细胞DNA的合成。流式细胞仪检测结果发现雷氏大疣蛛毒素作用后SMMC-7721细胞凋亡率增加，细胞周期阻滞在G2／M期。Western Blot方法进一步检测到雷氏大疣蛛毒素作用SMMC7721细胞72h后，c-myc蛋白表达减弱。结论 雷氏大疣蛛毒素可以抑制人肝癌细胞SMMC-7721的增殖和DNA的合成，其机制可能是诱导细胞凋亡，使细胞周期相关c-myc蛋白表达减弱，导致细胞周期的变化。     

华蟾素诱导人肝癌SMMC-7721细胞凋亡的实验研究

目的:探讨华蟾素诱导人肝癌细胞凋亡及作用机理。方法:采用 MTT 法、AO/EB 荧光染色法、流式细胞仪及免疫组化等方法,观察华蟾素对人肝癌 SMMC-7721细胞株的作用。结果:华蟾素可显著抑制SMMC-7721细胞的生长;经药物处理后,AO/EB 染色时,肝癌细胞在显微镜下呈现出典型的凋亡形态学改变;在流式细胞仪上可见华蟾素能将细胞周期阻断在 S 期;对抗凋亡基因 bcl-2表达有一定的抑制作用。结论:华蟾素能抑制人肝癌 SMMC-7721细胞生长;能诱导人肝癌细胞凋亡;其诱导细胞凋亡的机理与其能阻断细胞周期、抑制 bcl-2基因表达有关。