肝细胞生长因子对肝癌细胞系SMMC-7721失巢凋亡的影响

目的:探讨HGF对SMMC-7721失巢凋亡的影响以及P13K在该过程中的作用.方法:悬浮培养SMMC-772l,建立失巢凋亡模型.应用TUNEL染色观察凋亡率.分别悬浮培养SMMC-7721、HGF处理后SMMC-721及LY294002预处理后的HGF处理细胞,用台盼蓝染色观察细胞失巢凋亡后存活率,用MTT检测细胞的增殖能力的变化,流式细胞仪检测失巢凋亡细胞的早、晚期凋亡率,Hoechst染色观察不同处理细胞的凋亡情况.应用免疫印迹技术检测失巢凋亡后Akt、p-Akt、FAK、p-FAK的表达.结果:TUNEL染色显示,悬浮培养的SMMC-7721失巢凋亡率远大于贴壁培养的SMMC-7721(21.72%±6.85% vs 66.67%±7.66%,P<0.05);台盼蓝染色显示,HGF处理后的SMMC-7721存活率明显高于悬浮培养细胞(P<0.05),而HGF不能提高经LY294002预处理后细胞的存活率:MTT实验显示HGF处理细胞A值明显大于悬浮培养细胞(P<0.05),LY294002预处理细胞与悬浮培养细胞相似.流式细胞仪和Hoechst 33258染色均显示HGF处理后细胞的失巢凋亡明显低于悬浮培养细胞(P<0.05),而经LY294002处理后细胞的失巢凋亡率明显升高.蛋白印迹结果显示HGF处理后细胞Akt、FAK、p-Akt、p-FAK的表达均升高,而经LY294002预处理后,其表达与悬浮培养SMMC-7721一致.结论:在肝细胞癌SMMC-7721失巢凋亡过程中,HGF通过活化Akt和FAK来增强细胞的抗失巢凋亡能力,该作用受P13K的调节.     

骨桥蛋白促进人肝癌细胞株SMMC-7721恶性表型的实验研究

目的研究骨桥蛋白(OPN)对低侵袭性人肝癌细胞株SMMC-7721恶性表型的影响。方法pcDNA 3,1(-)/OPN重组质粒转染SMMC-7721细胞,以空质粒转染作对照,用RT- PCR反应、Western blot检测OPN表达水平,用ELISA检测细胞培养上清液OPN、MMP-2、-9、尿激酶纤溶酶原活化因子(uPA)水平,并用体外功能试验观察转染前后恶性表型的变化。结果重组质粒转染SMMC-7721后OPN表达明显升高,细胞培养上清液OPN为(3.02±0.12)ng/ml,对照组为(1.43±0.07)ng/ml,MMP-2重组质粒转染组为(43.04±3.06)ng/ml,对照组为(22.15±4.34)ng/ml、uPA重组质粒转染组水平明显高于空质粒转染组,分别为(4.78±0.70)ng/ml和(1.61±0.34)ng/ml,两组差异均有统计学意义,t值分别为19.89、6.81和7.03,P值均<0.01。MMP-9水平分别为(7.82±2.25)ng/ml和(7.70±1.92)ng/ml,两组差异无统计学意义。体外功能试验提示SMMC-7721转染OPN重组质粒后细胞黏附、运动和侵袭能力明显增强,细胞黏附率为75.33%±10.59%,对照组为57.34%±2.52%,t=2.86,P<0.05。运动试验透膜细胞数分别为(14.3±2.5)个和(6.3±1.5)个,t=4.70,P<0.05。侵袭试验透膜细胞数分别为(8.2±1.5)个和(4.1±1.3)个,t=4.11,P<0.05。而细胞增殖能力无明显改变。结论OPN可能是通过增加MMP-2、uPA分泌促进人肝癌细胞株SMMC-7721的恶性表型。     

柴胡皂甙d对肝癌SMMC-7721细胞环氧合酶-2表达的影响

环氧合酶2（COX-2）在消化系统肿瘤的发生、发展中起着重要作用，阻断或抑制COX-2的激活及其活性，可抑制包括肝癌细胞在内的许多肿瘤细胞的生长，并诱导其凋亡。近年研究表明，柴胡皂甙d（SSd）可调节免疫系统功能和细胞增殖，抑制肿瘤的发生、发展，但其作用机制尚不十分清楚。观察SSd对肝癌细胞株SMMC7721凋亡及COX-2 mRNA和蛋白质表达的影响，探讨其抗癌作用的可能机制，为开发应用柴胡皂甙防治肝癌等消化系统肿瘤提供理论依据。     

Genistein对肝癌细胞株SMMC-7721的抑制作用及对其癌基因表达的影响

原发性肝癌为高度恶性肿瘤,其病死率在我国各种恶性肿瘤中仅次于胃癌和食管癌,居第三位。虽然目前临床治疗方法较多,但疗效欠佳,预后不良。4′,5,7-三羟基异黄酮(Genistein)是近年来受到广泛关注的非营养素成分。本实验采     

RNA干扰p21对肝癌细胞SMMC-7721增殖的影响

目的:探讨RNA干扰技术沉默p21基因对肝癌细胞SMMC-7721增殖及恶性表型变化的影响.方法:通过慢病毒载体将p21小干扰RNA片段稳定转染入SMMC-7721细胞,通过RT-PCR,Western blot分别检MJp21 Mrna和蛋白表达变化,流式细胞仪检测7721-p2l RNAi组(感染p21 siRNA...     

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,...     

Knockdown of survivin gene expression by RNAi induces apoptosis in human hepatocellular carcinoma cell line SMMC-7721

AIM: To investigate the survivin gene expression in human hepatocellular carcinoma cell line SMMC-7721 and the effects of survivin gene RNA interference (RNAi) on cell apoptosis and biological behaviors of SMMC-7721 cells. METHODS: Eukaryotic expression vector of survivin gene RNAi and recombinant plasmid pSuppressorNeo-survivin (pSuNeo-SW), were constructed by ligating into the vector, pSupperssorNeo (pSuNeo) digested with restriction enzymes Xba I and Sail and the designed double-chain RNAi primers. A cell model of SMMC-7721 after treatment with RNAi was prepared by transfecting SMMC-7721 cells with the lipofectin transfection method. Strept-avidin-biotin-complex (SABC) immunohistochemical staining and RT-PCR were used to detect survivin gene expressions in SMMC-7721 cells. Flow cytometry was used for the cell cycle analysis. Transmission electron microscopy was performed to determine whether RNAi induced cell apoptosis, and the method of measuring the cell growth curve was utilized to study the growth of SMMC-7721 cells before and after treatment with RNAi. RESULTS: The eukaryotic expression vector of survivin gene RNAi and pSuNeo-SW, were constructed successfully. The expression level of survivin gene in SMMC-7721 cells was observed. After the treatment of RNAi, the expression of survivin gene in SMMC-7721 cells was almost absent, apoptosis index was increased by 15.6%, and the number of cells was decreased in G2/M phase and the cell growth was inhibited. CONCLUSION: RNAi can exert a knockdown of survivin gene expression in SMMC-7721 cells, and induce apoptosis and inhibit the growth of carcinoma cells.     

Growth-inhibitory effects of MOB2 on human hepatic carcinoma cell line SMMC-7721

AIM:To investigate the growth-inhibiting and apoptosis-inducing effects of the gene MOB2 on human hepatic carcinoma cell line SMMC-7721.METHODS:The full-length cDNA of the MOB2 gene was amplified from human umbilical vein endothelial cells.The correct full-length MOB2 cDNA was subcloned into the eukaryotic expression vector pEGFP-C1.After lipofection of the MOB2 gene into cancer cells,the levels of MOB2 protein in the cancer cells were detected by immunoblotting.To transfect the recombined plasmid vector pEGFP-CI-MOB2 into SMMC-7721 cells,the cells were cultured in Dulbecco's Modified Eagle'sMedium with 10% fetal calf serum and glutamine,and then mixed with liposomes,Lipofectamine 2000 and the plasmid vector pEGFP-CI-MOB2.RESULTS:We observed the growth and proliferation of SMMC-7721 cells containing pEGFP-CI-MOB2 and analyzed their apoptosis and growth cycle phases by flow cytometry.We successfully transfected the recombined plasmid vector pEGFP-CI-MOB2 into SMMC-7721 cells and screened for a single clone cell containing MOB2.After transfection,MOB2 enhanced growth suppression,induced apoptosis,increased the ratio of G0/G1,significantly inhibited the advance of cell cycle phase,and arrested cells in G0/G1 phase.CONCLUSION:MOB2 overexpression induces apoptosis and inhibits the growth of human hepatic cancer cells,which may be useful in gene therapy for hepatic carcinoma.     

三氧化二砷诱导人肝癌SMMC-7721细胞凋亡及对OPN表达的影响

目的探讨三氧化二砷（As2O3）治疗肝癌的可行性及机制。方法将一定浓度梯度的As2O3与人肝癌细胞株SMMC-7721孵育后,采用MTT法、荧光显微镜及流式细胞仪检测细胞增殖与凋亡变化,逆转录聚合酶链反应（RT-PCR）检测肝癌细胞株中骨桥蛋白基因（OPN mRNA）表达水平。结果As2O3作用后SMMC-7721细胞生长明显受抑,且呈时间-浓度依赖性;荧光显微镜下细胞呈典型的凋亡形态学改变;在流式细胞仪上可见“凋亡峰”,细胞周期阻滞于G2／M期;细胞OPN mRNA表达阳性,OPN mRNA表达水平明显下调。结论As2O3体外能有效抑制肝癌细胞株生长;其机制可能为诱导细胞凋亡、下调OPN mRNA表达。     

丹参酮ⅡA对肝癌SMMC-7721细胞COX-2表达的影响

目的:观察丹参酮ⅡA对肝癌SMMC-7721细胞生长和凋亡的影响及其作用机制．方法:体外培养肝癌SMMC-7721细胞株,经丹参酮ⅡA(终浓度0．5 mg／L)作用后,采用四唑盐(MTT)比色法检测细胞增殖,透射电镜观察细胞凋亡,流式细胞仪检测细胞凋亡,免疫细胞化学SABC法检测COX-2蛋白表达,放射免疫法检测前列腺素E2(PGE2)含量．结果:丹参酮ⅡA对肝癌细胞的生长有明显的抑制作用,并呈剂量依赖性．以0．5 mg／L作用终浓度抑制作用最明显,其48 h的抑制率为 69．3％,与对照组相比差异有显著性(P<0．01)．电镜下观察,丹参酮ⅡA作用后肝癌细胞表现为细胞皱缩、核染色质浓缩、核碎裂以及凋亡小体形成等凋亡特征性的形态改变．5 mg/ L丹参酮ⅡA作用后,随时间的延长,凋亡率逐渐升高,48 h达到高峰,随后逐渐下降(24,48, 72 h凋亡率分别为7．45％±0．33％、6．59％± 0．45％、4．78％±1．05％),与对照组比较,各处理组都有显著性差异(均P<0．01),丹参酮作用组肝癌细胞COX-2表达明显减少,其培养液中 PGE2的产生量下降,与对照组相比差异均有显著性(P<0．01)．结论:丹参酮ⅡA可能是通过下调COX-2 mRNA的表达水平发挥其对肝癌细胞生长抑制及促进凋亡作用．     

Metastatic human hepatocellular carcinoma models in nude mice and cell line with metastatic potential

Metastatic human HCC model is needed for the studies onmechanism and intervention of metastatic recurrence,Byusing orthotopic implantation of histologically intacttissues of 30 surgical specimens,a patient-likemetastatic model of human HCC in nude mice (LCI-D20)and a low metastatic model of human HCC in nude mice(LCI-D35) have been established.All mice withtransplanted LCI-D20 tumors exhibited extremely highmetastatic ability including spontaneous metastasis toliver,lungs,lymph nodes and peritoneal seeding.Remarkable difference was also found in expression ofsome of the invasiveness related genes and growthfactors between the LCI-D20 and LCI-D35 tumors.PAI-1increased gradually following tumor progression in LCI-D20 model,and correlated with tumor size and AFP level.Phasic expression of tissue intercellular adhesionmolecule-1 in this model was also observed.Using cornealmicropocket model,it was demonstrated that the vascularresponse induced by LCI-D20 tumor was stronger than thatinduced by LCI-D35 tumor.Similar report on metastatichuman HCC model in nude mice and human HCC cell linewith metastatic potential was rarely found in theliterature.This LCI-D20 model has been widely used forthe studies on intervention of metastasis,including anti-angiogenesis,antisense approach,metalloproteinaseinhibitor,differentiation inducer,etc.It is concluded thatthe establishment of metastatic human HCC model in nudemice and human HCC cell line with metastatic potentialwill provide important models for the in vivo and in vitrostudy of HCC invasiveness,angiogenesis as well asintervention of HCC recurrence.     

肝癌组织、缺氧SMMC-7721细胞中HPA的表达变化及机制探讨

目的观察肝癌组织及缺氧培养的肝癌SMMC-7721细胞中乙酰肝素酶（HPA）和缺氧诱导因子-1α（HIF-1α）的表达变化,并探讨其机制。方法免疫组化法检测50例肝癌组织、28例肝癌癌旁组织、14例正常肝组织中的HPA、HIF-1α蛋白。分别采用RT-PCR和Western blot法检测常氧和缺氧培养的人肝癌SMMC-7721细胞中HPA mRNA及其蛋白。结果 HPA、HIF-1α蛋白在肝癌组织中的阳性表达率显著高于癌旁和正常肝组织（P〈0.05）;肝癌组织中HPA、HIF-1α蛋白的表达呈正相关（r=0.295,P〈0.05）。缺氧培养20 h后,SMMC-7721细胞HPA mRNA表达量（6.234±0.457）显著高于常氧培养细胞的表达量（2.910±0.137）,两者相比,P〈0.05;其HPA蛋白表达量（65 kD为1.437±0.067,50 kD为1.706±0.066）也显著高于常氧培养细胞的表达量（65 kD为1.192±0.060,50 kD为1.580±0.265）,两者相比,P〈0.05。结论肝癌组织中HPA蛋白阳性表达率升高,缺氧肝癌SMMC-7721细胞中HPAmRNA及蛋白表达量均升高,可能与缺氧导致的HIF-1α表达上调有关。     

野生型p53对肝癌细胞POLD1基因表达及细胞恶性表型的影响

目的:探讨野生型p53对人肝癌细胞SMMC-7721细胞增殖和细胞恶性表型影响的一种可能机制,方法:设计并构建p53特异性小干扰shRNA绿色荧光真核表达质粒(p53-siRNA)和表达EGFP-p53融合蛋白的p53绿色荧光真核增强表达质粒(pEGFP-p53),通过脂质体Lipofection-2000介导转染,将...     

TGFα—PE40诱导人肝癌SMMC—7721细胞的凋亡

目的　探讨基因重组转化生长因子α－绿脓杆菌外毒素融合蛋白（ＴＧＦα－ＰＥ４０,简称ＴＰ４０）体外诱导人肝癌细胞株ＳＭＭＣ－７７２１凋亡的作用。方法以不同浓度的ＴＰ４０作用于体外培养的肝癌细胞,用流式细胞仪、电子显微镜和琼脂糖电泳的方法分析和检测细胞凋亡。结果在０．０１ｎｇ／ｍｌ浓度时,ＴＰ４０作用于培养肝癌细胞２０小时后,肿瘤细胞的凋亡率为５．６０％;０．０５ｎｇ／ｍｌ时,凋亡率为１７．２２％;０．１ｎｇ／ｍｌ时,凋亡率为 ３７．０４％。电镜显示出典型的细胞核固缩、碎裂征象,琼脂糖电泳呈特征性的“梯状”带。结论　低浓度ＴＰ４０可作为细胞凋亡诱导剂用于肝癌治疗。     

乙型肝炎病毒S基因经显微注射导入SMMC-7721细胞核内的表达

目的探讨细胞核显微注射导入外源基因的方法,观察HBV-S基因导入人肝癌细胞株SMMC-7721后的表达及其稳定性.方法将含有HBV-S片段的质粒pCR3.1-S线性化,通过显微注射仪直接注入培养的SMMC-7721细胞核内,G418筛选后,经EIA和免疫荧光法分别检测细胞培养上清和细胞内HBsAg的表达.结果每注射100～150个细胞可筛选出一个阳性克隆,3个阳性克隆经扩大培养后,其中1个克隆的培养上清经EIA法检测HBsAg阳性,免疫荧光显示细胞膜及细胞质均有HBsAg表达,并持续6 mo以上.结论HBV-S基因经显微注射导入SMMC-7721细胞后获得持续稳定的表达.     

酪丝缬肽对人肝癌细胞SMMC-7721血管生成相关基因表达谱的影响

目的:观察小分子三肽化合物酪丝缬hk(tyroscryatide,YSV)对人肝癌细胞系SMMC-7721的抑制作用,并分析YSV对肿瘤细胞血管生成相关基因表达的影响.方法:建立人肝癌细胞SMMC-7721的体外培养体系,采用四甲基偶氮唑蓝(MTT)比色法检测YSV对体外培养的SMMC-7721的增殖抑制作用,应用功能分类基因芯片分析人肝癌细胞SMMC-7721经药物作用后血管生成相关基因表达的差异变化,同时应用RT-PCR方法验证相关基因的表达.结果:YSV能显著抑制人肝癌SMMC-7721的生长,10mg/L YSV作用72h对SMMC-7721的增殖抑制率为42.34%,与对照组比较有统计学意义(P＜0.05).在113个血管生成相关基因中,YSV组相比对照组,基因下调0.667倍以上的有7个.RT-PCR在基因水平上证实YSV能显著抑制血管内皮生长因子(VEGF)和白介素8(IL-8)的表达.结论:YSV在体外能够显著抑制人肝癌细胞SMMC-7721的生长,并能在基因水平上下调肿瘤细胞血管生成相关因子的表达.