华蟾素对肝癌细胞株SMMC-7721增殖、凋亡的影响

目的探讨华蟾素对离体肝癌细胞株SMMC-7721的增殖、凋亡的影响,并探讨其机制。方法将肝癌细胞株SMMC-7721分为实验组及对照组,细胞培养后取对数生长期细胞,实验组加入0．4、0．6、0．8μmol／L华蟾素,对照组不加药,采用MTr法检测两组24、48h增殖抑制率,流式细胞术检测细胞周期比例及凋亡率,RT-PCR法检测半胱氨酸天冬氨酸蛋白酶（Caspase）-3mRNA表达,Westernblot法检测髓系白血病基因（Md）-1的蛋白表达。结果实验组增殖抑制率明显高于对照组,且呈时间和剂量依赖性,P均〈0．05;实验组凋亡率明显高于对照组,P〈0．05;实验组Caspase．3mRNA表达量明显高于对照组,P〈0．05;Mcl-1蛋白表达量明显低于对照组,P〈0．01。结论华蟾素对肝癌细胞株SMMC-7721具有增殖抑制及凋亡诱导的作用,其机理可能为使Caspase-3表达升高,Mcl-1表达降低。     

猪牙皂正丁醇提取物含药血清抑制人肝癌细胞 SMMC-7721 的实验研究

目的：研究猪牙皂提取物正丁醇部位对人肝癌细胞SMMC-7721的抑制效应。方法：40只Wistar雄性大鼠分为4组,其中1组给予生理盐水,其余3组分别给予高、中、低剂量猪牙皂正丁醇提取物（0．6g·kg^-1·d^-1、0．3g·kg^-1·d^-1、0．15g·kg^-1·d^-1）灌喂3天,采集其含药血清作用于人肝癌SMMC-7721细胞,MTr法检测细胞抑制率。结果：猪牙皂正丁醇提取物中、低剂量明显抑制人肝癌SMMC-7721细胞,高剂量无明显效果。结论：猪牙皂正丁醇提取物能够抑制人肝癌SMMC-7721细胞。     

索拉菲尼联合华蟾素对离体肝癌细胞株SMMC-7721的协同抑制效应观察

目的探讨索拉非尼与华蟾素对离体肝癌细胞株SMMC-7721协同作用的机制。方法将离体肝癌细胞株SMMC-7721分成四组,索拉非尼组予索拉非尼6.0μmol/L干预,华蟾素组予华蟾素0.6μmol/L干预,联合组予索拉非尼和华蟾素联合干预（剂量同前）,对照组不做任何干预。MTT法检测四组细胞增殖抑制率,FCM法检测细胞凋亡率,RT-PCR法检测M c l-1 mRNA表达,W estern b lot法检测M c l-1蛋白表达。结果联合组细胞增殖抑制率及凋亡率均明显高于索拉非尼组和华蟾素组,索拉非尼组和华蟾素组均明显高于对照组（P均〈0.05）。索拉菲尼组及联合组M c l-1 mRNA的表达均明显低于对照组（P均〈0.05）,而华蟾素与对照组相比差异无显著性;索拉菲尼、华蟾素及联合组M c l-1蛋白表达均明显低于对照组（P均〈0.05）。结论索拉非尼联合华蟾素对SMMC-7721细胞显示出协同抑制作用,其机理可能为抑制M c l-1蛋白表达。     

去甲斑蝥素诱导人肝癌细胞凋亡的研究

目的探讨去甲斑蝥素（NCTD）对人肝癌细胞SMMC-7721凋亡的影响。方法用MTT方法检测人肝癌细胞SMMC-7721的生长抑制率。应用流式细胞仪检测细胞周期和凋亡。结果 NCTD对人肝癌细胞SMMC-7721有生长抑制作用,随浓度升高、时间延长作用增强,呈剂量和时间效应关系。流式细胞仪示SMMC-7721细胞的S期细胞明显增多,G0/G1期细胞减少,凋亡率上升（P〈0.05或〈0.01）。结论 NCTD能显著抑制人肝癌SMMC-7721细胞的生长,其可能与抑制SMMC-7721细胞增殖,诱导细胞凋亡有关。     

麝黄消瘤方抑制肝癌细胞侵袭粘附作用的实验研究

目的：观察麝黄消瘤方（SHF）兔含药血清对SMMC-7721肝癌细胞侵袭粘附能力的影响及其机制的探讨。方法：以体外培养的肝癌细胞株为研究对象，将肝癌细胞株分别接种于中药组、对照组血清中培养，绘制细胞生长曲线，计算细胞生长抑制率。以流式细胞仪（FCM）测SHF对肝癌细胞表面细胞间粘附分子-1（ICAM-1）表达的影响。以免疫组化法观察SHF对肝癌细胞抑癌基因nm23-H1蛋白水平的表达。以细胞侵袭实验观察SHF对与纤维连接蛋白（FN）粘附的SMMC-7721细胞侵袭运动能力及其生长状况。以岍法测量SHF对肝癌细胞与FN粘附的影响。结果：中药组血清较对照组明显抑制肝癌细胞的体外生长，在第5天抑制率最高达66．25％；中药处理的肝癌细胞ICAM-1表达明显低于对照组，nm23-H1蛋白水平明显高于对照组。SHF可抑制肝癌细胞的侵袭运动能力及其与FN之间的粘附。结论：SHF可抑制SMMC-7721细胞的侵袭粘附能力，其作用与中药血清上调nm23-H1蛋白水平和降低ICAM-1表达等有关。     

原花青素对人肝癌细胞SMMC-7721增殖及凋亡的作用

目的探讨葡萄籽提取物原花青素（PA）对人肝癌细胞SMMC-7721增殖和凋亡的影响。方法取对数生长期人肝癌细胞SMMC-7721,分别加人20、40、60mg／L的PA培养24h后,采用MTI＂法检测细胞增殖抑制率、流式细胞仪分析细胞凋亡率,并测定细胞内超氧化物歧化酶（SOD）活力、丙二醛（MDA）和活性氧簇（ROS）等指标。结果20、40、60mg／L的PA对人肝癌细胞SMMC-7721的增殖抑制率分别为（22．7±1．8）％、（38．6±1。9）％、（47．6±2．5）％,细胞凋亡率分别为（19．7±5．1）％、（29．7±2．9）％、（48．5±4．5）％,两者均随PA浓度的升高而增高（P均〈0．01）;与对照组比较,各剂量组人肝癌细胞SMMC-7721中MDA、ROS水平逐渐下降（P〈0．05）;SOD活力逐渐上升（P〈0．05）。结论PA在体外可呈浓度依赖性抑制人肝癌细胞SMMC-7721的增殖及凋亡,其作用机制可能与清除ROS、提高SOD的活性、降低脂质过氧化反应等有关。     

端粒酶逆转录酶小干扰RNA对肝癌细胞的体外抑制作用

目的 研究靶向人端粒酶逆转录酶(hTERT)的小干扰RNA(siRNA)在肝癌细胞SMMC-7721中抗肿瘤作用。方法 针对hTERT基因编码区及非编码区，采用T7转录系统在体外合成了2条siRNA，转染SMMC-7721细胞。以四甲基偶氮唑盐试验、逆转录聚合酶链反应及western blot观察其对SMMC-7721细胞增殖、hTERT mRNA及蛋白表达的影响。结果 2条siRNA以剂量依赖性方式抑制了SMMC-772l细胞增殖，当给药浓度为100nmol／L时，对hTERT mRNA及蛋白表达有明显的抑制作用。结论 靶向hTERT的siRNA对hTERT基因表达有抑制效果，有可能发展为一种新的抗肿瘤药物。     

金雀异黄素诱导人肝癌细胞SMMC-7721细胞凋亡的研究

目的 探讨金雀异黄素(Genistein,Gen)对人肝癌SMMC-7721细胞凋亡调控的作用.方法将Gen分为5.0、10.0、20.0 μg/ml 三个浓度处理组和对照组(未加金雀异黄素),作用SMMC-7721细胞不同时间后,透射电镜观察细胞超微结构变化;免疫组化法检测细胞内Bax、Bcl-2蛋白的表达水平.结果 与对照组比较,Gen处理组可使细胞核内异染色质呈块状凝集、胞质内线粒体肿胀空化,随着作用浓度增加,细胞核呈固缩状,核内异染色质趋边凝集,细胞质空化明显;免疫组化显示,随着Gen浓度增加,Bax蛋白表达增强,Bcl-2蛋白表达减弱,并呈剂量依赖性(P＜0.01).结论 金雀异黄素可以诱导人肝癌SMMC-7721细胞凋亡.上调Bax蛋白表达,下调Bcl-2蛋白表达可能是其诱导细胞凋亡的作用机制.     

毛花苷C促进肝癌SMMC-7721细胞凋亡及抑制survivin的表达

目的:通过毛花苷C作用于人肝癌SMMC-7721细胞,研究其对SMMC-7721细胞增殖的影响初步探讨其作用机制.方法:使用不同浓度毛花苷C干预S M M C-7721细胞,通过细胞增殖实验及克隆形成实验,检测毛花苷C对SMMC-7721细胞增殖的作用;通过流式细胞仪检测毛花苷C对SMMC-7721细胞周期和凋亡的影响;采用Western blot技术分析细胞凋亡抑制基因survivin的表达.结果:毛花苷C对SMMC-7721细胞增殖有明显的抑制作用,各加药组与对照组相比差异有统计学意义(P0.01),并呈现剂量-效应相关关系;流式细胞术显示,毛花苷C将S M M C-7721细胞阻滞于S期,并诱导其凋亡;Western blot检测结果显示毛花苷C下调SMMC-7721细胞内survivin蛋白的表达.结论:毛花苷C明显抑制SMMC-7721细胞增殖,将细胞阻滞在S期并诱导其凋亡.该机制可能与下调survivin的蛋白表达有关.     

熊果酸诱导人肝癌SMMC-7721细胞凋亡的研究

目的：观察熊果酸（UA）对人肝癌SMMC-7721细胞的增殖抑制及诱导其凋亡作用。方法：MTT法检测5、10、20、30、40、50μmol/L UA对SMMC-7721细胞生长的抑制作用,吖啶橙（AO）荧光染色、电镜和流式细胞仪检测细胞凋亡。结果：UA能显著抑制SMMC-7721细胞的增殖,其作用呈剂量依赖性。35.2μmol/L UA作用SMMC-7721细胞48小时后AO染色,荧光显微镜下可见细胞出现体积缩小,核碎裂,染色质凝集等凋亡形态改变;电镜下SMMC-7721细胞出现明显的细胞凋亡的形态学改变,细胞核染色质出现边聚和中聚,细胞内部分线粒体肿胀;SMMC-7721细胞凋亡率为（67.91±5.24）%,与对照组（2.95±0.56）%比较差异有显著性意义（P〈0.05）。结论：UA通过诱导SMMC-7721细胞凋亡抑制其生长。     

Protein profile of human hepatocarcinoma cell line SMMC-7721： Identification and functional analysis

AIM: To investigate the protein profile of human hepatocarcinoma cell line SMMC-7721, to analyze the specific functions of abundant expressed proteins in the processes of hepatocarcinoma genesis, growth and metastasis, to identify the hepatocarcinoma-specific biomarkers for the early prediction in diagnosis, and to explore the new drug targets for liver cancer therapy. METHODS: Total proteins from human hepatocarcinoma cell line SMMC-7721 were separated by two-dimensional electrophoresis (2DE). The silver-stained gel was analyzed by 2DE software Image Master 2D Elite. Interesting protein spots were identified by peptide mass fingerprinting based on matrix-assisted laser desorption/ ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and database searching. RESULTS: We obtained protein profile of human hepatocarcinoma cell line SMMC-7721. Among the twenty-one successfully identified proteins, mitofilin, endoplasmic reticulum protein ERp29, ubiquinol- cytochrome C reductase complex core proteinⅠ, peroxisomal enoyl CoA hydratase, peroxiredoxin-4 and probable 3-oxoacid CoA transferase 1 precursor were the six novel proteins identified in human hepatocarcinoma cells or tissues. Specific functions of the identified heat-shock proteins were analyzed in detail, and the results suggested that these proteins might promote tumorigenesis via inhibiting cell death induced by several cancer-related stresses or via inhibiting apoptosis at multiple points in the apoptotic signal pathway. Other identified chaperones and cancer-related proteins were also analyzed.CONCLUSION: Based on the protein profile of SMMC-7721 cells, functional analysis suggests that the identified chaperones and cancer-related proteins have their own pathways to contribute to the tumorigenesis, tumor growth and metastasis of liver cancer. Furthermore, proteomic analysis is indicated to be feasible in the cancer study.     

Reversing effect of Tanshinone on malignant phenotypes of human hepatocarcinoma cell line

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Reversing effect of Tanshinone on malignant phenotypes of human hepatocarcinoma cell line

AIM To study the reversing effect of Chinese drug tanshinone on malignant phenotype of cancer cells.METHODS Human hepatocarcinoma cell line (SMMC-7721) was treated in vitro with 0.5mg/L tanshinone for 4 days, and variation in cell differentiation was detected.RESULTS The morphology of cancer cells was tended toward well differentiation and cell growth was markedly inhibited. BrdU uptake assay and immunohistochemical stain of PCNA showed that the BrdU labeling rate and PCNA positive rate were lower than the controls, but no difference was found statistically as compared with all transretinoic acid. Flow cytometric assay demonstrated that S phase cells decreased and G0/G1 phase cells increased. Expression of c-myc oncogene protein decreased but the c-fos oncogene protein markedly increased.CONCLUSION Tanshinone could reverse the inducing differentiation in human hepatocarcinoma cells (SMMC-7721). It may become a new prospective inducer of cell differentiation to treat cancers.     

Inhibitory effect of antisense vascular endothelial growth factor 165 eukaryotic expression vector on proliferation of hepatocellular carcinoma cells

AIM: To construct antisense VEGF(165) eukaryotic expression vector PCDNA(3)-as-VEGF(165) and to study its expression and effect on the proliferation of hepatocarcinoma SMMC-7721 cells. METHODS: VEGF(165) cDNA was inserted into polylinker sites of eukaryotic expression vector PCDNA(3) to construct PCDNA(3)-as-VEGF(165). Then the vector was transferred into human hepatocarcinoma cell strain SMMC-7721 with cation lipofectamine 2000 mediated methods to evaluate the expression of VEGF protein and the inhibitory effect on the proliferation of hepatocarcinoma SMMC-7721 cells. RESULTS: The detection indicated the presence of VEGF cDNA in normally cultured SMMC-7721 cells by PCR. VEGF mRNA expression was notably decreased in SMMC-7721 cells by RT-PCR after PCDNA(3)-as-VEGF(165) transfection. The expression of VEGF protein was dramatically inhibited (142.01+/-7.95 vs 1 625.52+/-64.46 pg/ml(-1), P<0.01) 2 days after transfection, which correlated with the dose of PCDNA(3)-as-VEGF(165)5 gene. VEGF protein was most expressed in PCDNA(3) transferred SMMC-7721 cells but few in PCDNA(3)-as-VEGF(165) transferred cells by immunohistochemical staining. The apoptotic rate of hepatocarcinoma SMMC-7721 cells was significantly promoted (17.98+/-0.86% vs 4.86+/-0.27%, P<0.01) and the survival rate was notably decreased (80.99+/-3.20% vs 93.52+/-3.93%, P<0.05) due to antisense VEGF(165) by flow cytometry (FCM). The transfection of antisense VEGF(165) gene resulted in the inhibitory effect on the proliferation of hepatocarcinoma cells by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) and the death of all hepatocarcinoma cells on day 6 after transfection. CONCLUSION: It is confirmed that antisense VEGF(165) can inhibit the expression of VEGF protein, interfere with the proliferation and induce the apoptosis of hepatocarcinoma cells in our study. Antisense VEGF(165) gene therapy may play an important role in the treatment of human hepatocarcinoma.     

Smac基因过表达联合顺铂对SMMC-7721细胞增殖和凋亡的影响

目的 探讨Smac基因过表达联合顺铂对肝癌细胞增殖和凋亡的影响.方法 采用脂质体介导的转染方法 ,将重组质粒pcDNA3.1+hSmac导入人肝癌细胞株SMMC-7721中,采用Western blot和流式细胞术检测转染前后Smac蛋白表达情况.转染24 h后分别加入终浓度为5、15、25 μg/ml的顺铂诱导细胞凋亡.采用四甲基偶氮唑盐比色法检测癌细胞的增殖抑制作用,吖啶橙-溴化乙锭荧光染色法和膜联蛋白V/碘化丙啶双染标记流式细胞术检测细胞凋亡. 结果 Westernblot和流式细胞术检测结果证实转染后Smac蛋白表达明显增加(P＜0.01).与空白对照相比,Smac基因过表达可抑制癌细胞增殖,促进凋亡(P＜0.01).而且给予顺铂处理后,与空白对照组相比,细胞生长抑制率随剂量增加而显著上升,且转染Smac的细胞生长抑制率较相应未转染Smac的细胞明显升高(P＜0.01).吖啶橙-溴化乙锭荧光染色法和流式细胞术检测显示,转染Smac加顺铂处理组较单纯顺铂处理组细胞凋亡明显增加,差异具有统计学意义(P＜0.01).这表明Smac基因过表达可增强顺铂对肝癌细胞的增殖抑制和凋亡促进作用. 结论 促凋亡基因Smac可在肝癌细胞中过表达,抑制癌细胞的增殖和促进凋亡;而且过表达的Smac基因可增强癌细胞对化疗药物顺铂的敏感性,这为研究Smac在癌细胞凋亡过程中的调控作用以及肝癌化学治疗效果的改善提供了实验基础.     

Subcellular daunorubicin distribution and its relation to multidrug resistance phenotype in drug—resistant cell line SMMC—7721／R

AIM：To investigate the correlation between subcellular daunorubicin distribution and the multidrug resistance phenotype in drug-resistant cell line SMMC-7721/R.METHODS:The multidrug resistant cell line SMMC-7721/R,a human hepatocellular carcinoma cell line,was established.Antisenes oligonucleotides(AS-ODN)were used to obtain different multidrug resistance phenotypes by inhibiting the expression of mdr1 gene and/or multidrug resistance-related protein gene(mrp)using Lipofectamine as delivery agent.Expression of mdr1 and mrp genes was evaluated by RT-PCRand Western blotting.Intracellular daunorubicn(DNR)concentration was measured by flow cytometry.Subcellular DNR distribution was analyzed by confocal laser scanning microscopy.Adriamycin(ADM)and DNR sensitivity was examined by MTTmethod.RESULTS:Low level expression of mdr1 and mrpmRNAs and no expression of P-Glycoprotein(P-gp)and multidrug resistance-related protein(P190)were detected in parental sensitive cells SMMC-7721/S,but over-expression of these two genes was observed in drug-resistant cell SMMC-7721/R,The expression of mdr1 and mrp genes in SMMC-7721/Rcells was down-regulated to the level in the SMMC-7721/Scells by AS-ODN.Intracellular DNAconcentration in SMMC-7721/Scells was 10times higher than that in SMMC-7721/Rcells.In SMMC7721/Scells intracellular DNA distributed evenly in the nucleus and cytoplasm.while in SMMC-7721/Rcells DNR distributed in a punctate pattern in the cytoplasm and was reduced in the nucleus.DNR concentration in SMMC-7721/Rcells co-transfected with AS-ODNs targeting to mdr1and rpmRNAs recovered to 25percent of that in SMMC7721/Scells.Intracellular DNA distribution pattern in drug-resistant cells treated by AS-ODN was similar to drug-sensitive cell.and the cells resistance index(RI)to DNA and AMD decreased at most from 88.0and 116.0to4.0and 2.3,repectively.Co-Transfection of two AS-ODNs showed a stronger synergistic effect than separate transfection.CONCLUSIONS:P-gp and P190are two members mediatingMDR in cellline SMMC7721/R,Intracellular drug concentration increase and subcellular distribution change are two important factos in multidrug resistance(MDR)formation.The second facto,drugs transport by P-gp andP190from cell nucleus to organell in cytoplasm,may play a more important role.     

Expression of gap junction genes connexin32 and connexin43 mRNAs and proteins, and their role in hepatocarcinogenesis

AIM: To investigate the relationship between hepatocarcinogenesis and the expression of connexin32 (cx32), connexin43 (cx43) mRNAs and proteins in vitro.METHODS: Gap junction genes cx32 and cx43 mRNA in hepatocellular carcinoma cell lines HHCC, SMMC-7721 and normal liver cell line QZG were detected by in situ hybridization (ISH) with digoxin-labeled cx32, and cx43 cDNA probes. Expression of Cx32 and Cx43 proteins in the cell lines was revealed by indirect immuno-fluorescence and flow cytometry (FCM).RESULTS: Blue positive hybridization signals of cx32 and cx43 mRNAs detected by ISH with cx32 and cx43 cDNA probes respectively were located in cytoplasm of cells of HHCC, SMMC-7721 and QZG. No significant difference of either cx32 mRNA or cx43 mRNA was tested among HHCC, SMMC-7721 and QZG (P=2.673, HHCC vs QZG; P=1.375, SMMC-7721 vs QZG). FCM assay showed that the positive rates of Cx32 protein in HHCC, SMMC-7721 and QZG were 0.7%, 1.7% and 99.0%, and the positive rates of Cx43 protein in HHCC, SMMC-7721 and QZG were 7.3%, 26.5% and 99.1% respectively. Significant differences of both Cx32 and Cx43 protein expression existed between hepatocellular carcinoma cell lines and normal liver cell line (P=0.0069, HHCC vs QZG; P=0.0087, SMMC-7721 vs QZG). Moreover, the fluorescent intensities of Cx32 and Cx43 proteins in HHCC, SMMC-7721 were lower than that in QZG.CONCLUSIONS: Hepatocellular carcinoma cell lines HHCC and SMMC-7721 exhibited lower positive rates and fluorescent intensities of Cx32, Cx43 proteins compared with that of normal liver cell line QZG. It is suggested that lower expression of both Cx32 and Cx43 proteins in hepatocellular carcinoma cells could play pivotal roles in the hepatocarcinogenesis. Besides, genetic defects of cx32 and cx43 in post-translational processing should be considered.     

5-Aza-CdR对肝癌细胞DAPK基因甲基化的影响

目的探讨去甲基化药物5-氮杂-2’-脱氧胞苷(5-Aza-CdR)对人肝癌细胞株SMMC-7721中死亡相关蛋白激酶(DAPK)基因启动子CpG岛甲基化的影响。方法不同浓度(0.5μmol/L、5.0μmol/L、50.0μmol/L)5-Aza-CdR处理人肝癌细胞株SMMC-772172小时后,用焦磷酸测序法检测处理前后DAPK基因启动子CpG岛甲基化水平。以未经处理的人肝癌细胞株SMMC-7721作为对照组。结果未经5-Aza-CdR处理的肝癌细胞SMMC-7721细胞株DAPK基因启动子高度甲基化,平均水平为76.71%。经3种不同浓度药物处理72小时后,各组间甲基化平均水平分别为78.29%、77.57%和66.00%,各组间甲基化水平差异均有统计学意义(F=39.71,P<0.01)。其中,50.0μmol/L处理组细胞甲基化水平最低,与其他各组差异均有统计学意义(P<0.01)。结论 SMMC-7721细胞株DAPK基因启动子区呈高度甲基化状态;5-Aza-CdR能够逆转人肝癌细胞SMMC-7721DAPK基因启动子区域的甲基化状态。     

HERG K^＋通道对VEGF诱导的肝癌细胞迁移和侵袭的影响

目的研究HERG K＋通道对VEGF诱导的肝癌细胞在侵袭和迁移方面的调节作用。方法运用膜片钳技术分别检测正常肝细胞系L-02和肝癌细胞系SMMC-7721中HERG K＋通道的表达情况;采用Bodyen-Chamber系统检测在HERG K＋通道特异性抑制剂E-4031作用后,对VEGF诱导的SMMC-7721细胞侵袭力和迁移潜能方面的影响;ELISA法检测E-4031处理SMMC-7721细胞后,培养基上清中的VEGF水平的变化。结果 HERG K＋通道在SMMC-7721细胞中表达,而在L-02细胞中不表达;且VEGP诱导的SMMC-7721细胞侵袭和迁移现象可被E-4031呈剂量依赖性地抑制;在阻断HERG K＋通道后上清中VEGF水平明显降低。结论肝癌细胞中存在HERG K＋通道,它可通过调控VEGF分泌水平来影响肝癌细胞的侵袭和迁移能力。由此,HERG K＋通道将有可能成为诊断肝癌和判断预后的新标志物及治疗的新靶位。     

黄芩苷对肝癌细胞SMMC-7721 JAK-STAT信号通路STAT3的影响

目的:探讨黄芩苷对肝癌细胞SMMC-7721JAK-STAT信号通路STAT3的影响.方法:将肝癌细胞SMMC-7721分为4组:对照组、黄芩苷组、AG490组、黄芩苷+AG490组.应用RT-PCR法检测各组肝癌细胞SMMC-7721中STAT3mRNA表达,Westernblot法检测肝癌细胞SMMC-7721中STAT3、P-STAT3蛋白表达.结果:黄芩苷可以下调肝癌细胞SMMC-7721STAT3mRNA表达,与对照组比较明显下降(0.505±0.111vs0.697±0.145,P<0.05);并可以降低STAT3蛋白的表达量(0.879±0.012vs1.087±0.015,P<0.05);还可以抑制STAT3向活化形式P-STAT3转化,与对照组比较P-STAT3表达明显下降(0.983±0.085vs1.103±0.074,P<0.05),而与AG490联合应用后P-STAT3蛋白表达量较单用黄芩苷下降明显(0.756±0.103vs0.983±0.085,P<0.05).结论:黄芩苷能下调STAT3mRNA表达水平,降低STAT3蛋白表达,还可以抑制STAT3向活化形式P-STAT3转化,...