Positional and expressive alteration of prohibitin during the induced differentiation of human hepatocarcinoma SMMC-7721 cells

AIM： To explore the existence and distribution of prohibitin （PHB） in nuclear matrix and its co-localization with products of some related genes during the differentiation of human hepatocarcinoma SNMC-7721 cells. METHODS： The nuclear matrix of the SMMC-7721 cells cultured with or without 5 × 10^-3 mmol/L hexamethylene bisacetamide （HNBA） was selectively extracted. Western blot was used to analyze the expression of PHB in nuclear matrix; immunofluorescence microscope observation was used to analyze the distribution of PHB in cell. LCSM was used to observe the co-localization of PHB with products of oncogenes and tumor suppressor genes. RESULTS： Western blot analysis showed that PHB existed in the composition of nuclear matrix proteins and was down-regulated by HMBA treatment. Immunofluorescence observation revealed that PHB existed in the nuclear matrix, and its distribution regions and expression levels were altered after HMBA treatment. Laser scanning confocal microscopy revealed the co-localization between PHB and the products of oncogenes or tumor repression genes including c-los, c-myc, p53 and Rb and its alteration of distributive area in the cells treated by HMBA. CONCLUSION： These data confirm that PHB is a nuclear matrix protein, which is located in the nuclear matrix, and the distribution and expression of PHB and its relation with associated genes may play significant roles during the differentiation of SMMC-7721 cells.

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 protein I, 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.

Activity Determination of 8 Chinese Herbs against Hepatoma Cell SMMC-7721 in Vitro by MTT Method

[Objective] The aim was to build up a set of efficient and rapid models for laboratory to screen anti-hepatocellular carcinoma active substance in vitro. [ Method] By using MTT method, the activities of anti-hepatocellular carcinoma SMMC-7721 in vitro from Cymbopogon distans, Lobelia chinensis, Buddleja offlcinalis, Glycyrrhiza uralensis, Sanguisorba officinalis, Bupleurum chinense, Apium graveolen and Curuma zedoaria were tested. The growth curve of hepatoma cell was described, and the growth status in different periods were observed by inverted microscope. [ Result] Cells induced by active substance would be condensing, clear brim, which have significant differences from normal SMMC- 7721 cells. The results suggested that ESCG, ESCC, ESCB could inhibit proliferation of SMMC-7721 cells at the concentration of 1.0 -1.5 mg/ml, and the inhibition rate were 51.6%, 48.5%, 52.9% respectively. With the increasing of concentration, the inhibition strengthened. [ Conclusion] MTT method could be used as a basic model for screening important anti-hepatoma.

Downregulation of alpha-fetoprotein siRNA inhibits proliferation of SMMC-7721 cells

AIM: To study the function of α-fetoprotein (AFP) in SMMC-7721 hepatoma cells.METHODS: A hairpin siRNA expressing plasmid pSilencer3.0-H1-afp was constructed and transfected into SMMC-7721 cells with Lipofectamine 2000. The expression of AFP was monitored by real-time RT-PCR and immunoassays, its effect on SMMC-7721 cell proliferation and cell death was detected by MTT and fluorescenceactivated cell sorter (FACS).RESULTS: The AFP-siRNA expressing plasmid downregulated the expression of AFP obviously (about 34%), and inhibited SMMC-7721 cell proliferation, but did not induce apoptosis.CONCLUSION: Downregulation of AFP siRNA inhibits proliferation of SMMC-7721 cells, but cannot cause apoptosis.

Effects of cytotoxic T lymphocytes on hepatoma cell line SMMC-7721 induced by different subsets of dendritic cells in vitro

BACKGROUND: Dendritic cells (DCs) loaded with complex antigen are always used to induce cytotoxic T lymphocytes (CTLs) which have a specific anti-tumor activity. However, CTLs can assault autologous cells induced by DCs loaded with autologous antigen. This study aimed to explore how to weaken the autoimmune reaction induced by DC vaccine by combining mature DC (mDC) activating immunity and immature DC (imDC) leading to immune tolerance to make hepatocellular carcinoma (HCC) vaccine in vitro. METHODS: DC progenitors derived from human peripheral blood were assigned to two groups. One was cultured to mDC and pulsed with frozen-thawed antigen (FTA) of human HCC cell line SMMC-7721 cells (mDC group), and the other was cultured to imDC and pulsed with FTA of human liver cell line L-02 cells (imDC group). The morphology of DCs was monitored and cells phenotypes including HLA-DR, CD80, CD1α, CD83 were assayed by flowcytometry (FCM). The concentrations of interleukin-12 (IL-12) in the supernatant were assayed by ELISA. Methyl thiazolyl tetrazolium (MTT) was used to evaluate T cell proliferation induced by mDC and imDC and the killing rate of CTL induced by mDC and imDC respectively/together on SMMC-7721 and L-02 cells. RESULTS: Compared with the imDC group, the mDC group was characterized by the following: increased secretion of IL-12 (P【0.05); higher expression of HLA-DR, CDla, CD80, CD83; and stronger activity in stimulating proliferation of isogenic T cells (P【0.05). CTL induced by the mDC group had a significant killing response to SMMC-7721 as well as a higher killing rate for L-02 (P】0.05). CTL induced by mDC and imDC together had a higher killing response to SMMC-7721, but a lower killing rate for L-02(P【0.01). CONCLUSIONS: CTL induced by mDC and imDC together has a higher antigen-specific killing response in vitro than that induced by mDC alone. This may be of greater clinical value.

Combined anti-tumor effects of mDRA-6 and nimesulide on human hepatocellular cancer cell line SMMC-7721

Objective: The aim of this work was to evaluate anti-tumor effects of mDRA-6 plus nimesulide on a human hepatocellular cancer cell line, SMMC-7721, and study the main mechanisms. Methods: The DR5 receptor of SMMC-7721 cells was detected by flow cytometry (FCM). For further experimental application, SMMC-7721 cells were treated with proper dose of mDRA-6, nimesulide, or mDRA-6 plus 200 μmol/L nimesulide; untreated SMMC-7721 cells were comparably set as control. Cytotoxicity was tested by MTT assay; cell morphology was examined using Hoechst 33258 staining; and apoptosis was determined by FCM. Results: The positive rate of DR5 on SMMC-7721 was 95.0%. Either mDRA-6 or nimesulide alone induces SMMC-7721 cell death in a dose-dependent manner. Treatment of 1,600 ng/mL mDRA-6 for 12h led to a cell-death rate of 35.0%, while an increased cell-death rate (91.1%) was found under the same condition of mDRA-6 treatment supple- mented with 200 μmol/L nimesulide. Hoechst 33258 and Annexin V/PI staining confirmed apoptosis as the main cause of this anti-tumor response. Conclusion: Both mDRA-6 and nimesulide can induce apoptosis of SMMC-7721 cells, and they have synergistic anti-tumor activities against SMMC-7721.

Modulating effects of survivin antisense oligonucleotide on changes of apoptosis and cell cycle of human hepatocellular carcinoma cell line SMMC-7721

To investigate the modulating effects of survivn antisense oligonucletode (ASODN) on the cell cycle and apoptosis of human hepatocellular carcinoma (HCC) cell line SMMC-7721 and explore its mechanism.Methods Survivin ASODN was transfected into SMMC-7721 cells mediated by DOTAP liposomal reagent.Electron microscopy,flow cytometry and RT-PCR were used to detect the changes in cell ultrastructure,apoptosis,cell cycle and the expression of cyclinB1 mRNA,respectively.Results After transfection of survivin ASODN,the expression of cyclinB1 mRNA in the cells significantly increased and increase in G2-M arrest and apoptosis appeared.Meanwhile,the cell ultrastructure had apoptotic changes such as chromatin condensation and apoptotic body formation.Conclusion Survivin ASODN can induce the expression of cyclinB1 that may result in G2-M arrest.Consequently,apoptosis is triggered.Survivin ASODN transfection might be an improtant new treatment for HCC.14 refs,2 figs,1 tab.

文蛤多肽对体外培养人肝癌细胞SMMC-7721的抑制作用

研究了文蛤多肽对体外培养的人肝癌SMMC-7721细胞的抑制作用,结果表明,经5.0μg/mL文蛤多肽处理的体外培养的人肝癌细胞(SMMC-7721)生长缓慢,倍增时间延长,细胞生长抑制率达89.4%;处理后的癌细胞形态发生明显改变,处于G0/G1期的细胞明显增多,而S期和M期细胞减少,出现明显的凋亡峰,凋亡率为22.3%.实验结果表明,文蛤多肽能有效地抑制体外培养肝癌细胞的增殖活动,可通过改变肝癌细胞的形态及细胞周期而明显抑制细胞的增殖.

龙胆苦苷等6种中草药提取物对SMMC-7721人肝癌细胞增殖的影响

目的 研究龙胆苦苷等 6种中药有效成分对 SMMC- 772 1人肝癌细胞增殖的影响。方法 MTT法测定不同浓度的 SMMC- 772 1人肝癌细胞活力 ,观察药物对癌细胞增殖的影响。结果 10 2 ,10 4和 10 6nmol.L-1的土贝母皂苷、10 4nmol.L-1和 10 2 nmol.L-1的龙胆苦苷、10 2 nmol.L-1的白屈菜红碱、 3个不同浓度的血根碱及 1g.L-1的败酱草提取物作用于细胞 4 8h后对细胞具有明显的杀伤效应 ;10 mg.L-1的败酱草提取物和 1g.L-1和 10 mg.L-1的威灵仙提取物对肝癌细胞具有促生长作用。结论 龙胆苦苷、土贝母皂苷、白屈菜红碱和血根碱能抑制 SMMC- 772 1人肝癌细胞增殖 ;败酱草提取物能促进肝癌细胞增殖 ;低浓度威灵仙提取物抑制、高浓度促进肝癌细胞增殖。

河蚬提取物对人肝癌细胞SMMC-7721的抑制作用

以河蚬(Corbicula fluminea)为材料,经过甲醇抽提,乙酸乙酯萃取等方法得到河蚬提取物(CFE).用MTT法检测其对肝癌细胞株的抑制作用,借助光学倒置显微镜以及流式细胞术考察CFE对细胞的形态及细胞周期的影响.实验结果表明:CFE对肝癌细胞SMMC-7721有增殖抑制作用,处理72 h细胞形态发生了明显变化,其IC50值为70μg/mL.FMC的结果显示,经CFE处理后的肝癌SMMC-7721细胞出现明显的凋亡峰.这说明CFE有效抑制了体外培养的肝癌细胞增殖,并且能够改变癌细胞的形态及细胞周期的分布,诱导癌细胞出现凋亡.

莪术油对肝癌细胞SMMC-7721基因表达的影响

目的:检测莪术油对肝癌细胞SMMC-7721生长,及肝癌相关基因表达的影响。方法:利用MTT比色法检测莪术油对肝癌细胞SMMC-7721增殖的影响;利用以肝癌cDNA抑制性消减文库构建的肝癌相关基因微阵列,检测莪术油作用肝癌细胞SMMC-772136h后基因的表达变化。结果:莪术油作用肝癌细胞SMMC-772136h后,细胞生长受到明显抑制,并观察到有23个基因表达下调,3个基因表达上调。结论:莪术油对肝癌肿瘤细胞的作用是通过影响多基因的表达改变实现的。

黄连素对SMMC-7721人肝癌细胞凋亡和细胞周期的影响研究

目的研究黄连素对SMMC-7721人肝癌细胞凋亡和细胞周期的影响,为临床肝癌的治疗提供科学的参照。方法选取人的SMMC-7721型肝癌细胞,分别在加入500μM、250μM、125μM、62.5μM、31.25μM、0μM黄连素的培养液中进行体外培养。于0 h、24 h、48 h、72 h时使用MTT方法对细胞活性进行测定,基于统计学处理方法,分析黄连素对SMMC-7721人肝癌细胞凋亡和细胞周期的影响作用。结果黄连素对SMMC-7721人肝癌细胞的生长具有显著的抑制作用,且随着作用时间和作用浓度的增加抑制作用呈上升趋势,但黄连素不会影响SMMC-7721人肝癌细胞的复制增殖周期。结论黄连素对能够显著抑制SMMC-7721人肝癌细胞的生长,并诱导细胞的凋亡,作用程度与作用时间和浓度呈正相关,但对细胞的增殖周期没有影响。

中药复方H3C-1对肝癌细胞SMMC-7721基因表达的影响

检测中药复方H3C-1对肝癌细胞SMMC-7721细胞生长,及肝癌相关基因表达的影响。利用MTT比色法检测复方H3C-1对肝癌细胞SMMC-7721细胞增殖方面的影响;利用以肝癌cDNA抑制性消减文库构建的肝癌相关基因微阵列,检测复方H3C-1作用肝癌细胞SMMC-7721 36 h后基因的表达变化。结果显示中药复方H3C-1作用肝癌细胞SMMC-7721后36h,观察到有31个基因表达下调,1个基因上调。中药复方H3C-1对肝癌肿瘤细胞的作用是通过影响多基因的表达改变实现的;该研究为复方H3C-1的抑癌分子机理提供了重要线索。

肝癥口服液含药血清对肝癌细胞SMMC-7721细胞增殖的影响

目的:探讨肝口服液含药血清对肝癌细胞SMMC-7721细胞增殖的影响,为临床应用肝口服液治疗肝癌提供实验室依据。方法:选取Ⅱb或Ⅲ期肝癌病人和健康志愿者各5例,分别在用药前及用药后8周采集血清,与SMMC-7721细胞共同培养24h、48h后,应用噻唑氮蓝(MTT)比色法测定肝癌细胞SMMC-7721增殖水平。结果:HCC患者含药血清对SMMC-7721细胞增殖抑制率在24h、48h分别为45.00%3、9.32%;而健康志愿者为4.58%、7.70%,HCC患者含药血清对肝癌细胞增殖抑制作用明显高于健康志愿者。结论:肝口服液含药血清对SMMC-7721细胞的增殖有明显的抑制作用并促进其凋亡,表明肝口服液有抗肿瘤作用。

无梗五加果实3种提取物对人肝癌细胞SMMC-7721增殖和凋亡的影响

目的:研究无梗五加果实3种提取物对人肝癌细胞SMMC-7721增殖、细胞周期和凋亡的影响,为明确其抗肿瘤作用机制提供参考。方法:采用MTT法考察低、中、高质量浓度的无梗五加果实乙醇提取物(0.92、1.84、3.68 mg/m L)、粗多糖提取物(0.06、0.12、0.24 mg/m L)和精多糖提取物(0.04、0.08、0.16 mg/m L)分别作用24、36、48 h后对人肝癌细胞SMMC-7721的增殖抑制作用;采用流式细胞术考察1.84 mg/m L乙醇提取物、0.24 mg/m L粗多糖提取物和0.16 mg/m L精多糖提取物分别作用24 h后对人肝癌细胞SMMC-7721细胞周期和细胞凋亡的影响。以上试验均设阴性对照(只加细胞不加药物)。结果:与阴性对照比较,无梗五加果实3种提取物均可显著抑制人肝癌细胞SMMC-7721的增殖(P<0.01),显著降低G0/G1、G2/M期细胞的百分率(P<0.01),显著升高S期细胞的百分率(P<0.01),显著升高细胞凋亡率(P<0.05),其中以无梗五加果实乙醇提取物的作用最为明显。结论:无梗五加果实3种提取物均能抑制人肝癌细胞SMMC-7721的增殖,阻滞其细胞周期于S期,诱导其凋亡。

槲寄生碱对人肝癌细胞株SMMC-7721 bcl-2mRNA表达的影响

为研究槲寄生碱对人肝癌细胞株SMMC-7721对bcl-2mRNA表达的影响。采用半定量RT-PCR法测定bcl-2mRNA表达变化。结果表明,RT-PCR检测SMMC-7721细胞中bc1-2、mRNA表达的相对强度,发现bc1-2mRNA的表达强度降低(P<0.05)。说明中药槲寄生碱抑制肝癌SMMC-7721细胞增殖作用与降低bcl-2mRNA表达水平有关。

槲寄生生物碱通过P53途径抑制肝癌细胞株SMMC-7721的研究

目的:探讨槲寄生生物碱对肝癌细胞株SMMC-7721 P53基因表达的影响。方法:MTT法测定槲寄生生物碱对人肝癌细胞株SMMC-7721增殖的抑制作用;半定量RT-PCR法测定抑癌基因P53 mRNA表达变化。结果:槲寄生生物碱作用后SMMC-7721细胞出现显著生长抑制作用,且呈剂量和时间依赖性。RT-PCR检测SMMC-7721细胞中P53 mRNA表达的相对强度,发现0.100mg/mL的槲寄生生物碱作用于SMMC-7721细胞24小时后,P53 mRNA表达的相对强度增高(P<0.01)。结论:槲寄生生物碱对抑癌基因P53表达的影响可能是其抑制肿瘤生长的分子基础。

消癌解毒方及醇提物对肝癌SMMC-7721细胞增殖及P53-P21基因表达的影响

目的探讨消癌解毒方及醇提物对肝癌SMMC-7721细胞增殖及P53、P21基因表达的影响。方法体外培养肝癌细胞,分为肝癌对照组、消癌解毒方组和醇提物组,不同剂量药物分别作用于肝癌细胞24 h、48 h和72 h后,CCK-8法检测各组细胞增殖活性,数码倒置显微镜观察细胞形态,实时定量PCR检测P53和P21基因表达情况。结果作用剂量上,22μg/mL消癌解毒方组、100μg/mL和150μg/mL醇提物组对细胞增殖的抑制作用优于其它剂量组;作用时间上,72 h抑制细胞增殖作用优于48 h和24 h;22μg/mL消癌解毒方组和100μg/mL醇提取物组对细胞形态影响显著;且明显提高P53和P21基因的表达。结论消癌解毒方及醇提物通过上调肝癌SMMC-7721细胞P53基因的表达,并激活其下游P21基因的表达,从而抑制肝癌细胞增殖可能是其抗肿瘤作用机理;而醇提物可能是该方发挥药效的有效作用部位。

蟾酥注射液对人肝癌SMMC-7721细胞增殖与凋亡的影响

目的研究蟾酥注射液对人肝癌SMMC-7721细胞增殖与凋亡的影响。方法CCK-8法检测SMMC-7721细胞活力;DCFH-DA染色法检测SMMC-7721细胞活性氧(reactive oxygen species,ROS)水平;荧光染色法观察SMMC-7721细胞线粒体膜电位变化;流式细胞术检测SMMC-7721细胞凋亡率。结果蟾酥注射液明显抑制SMMC-7721细胞增殖,呈时间和浓度依赖性,作用24、48和72h后,半数抑制浓度(IC 50)分别为2.60±0.01、2.00±0.10和1.57±0.17μg/L;ROS检测结果显示不同浓度药物处理组细胞内ROS水平与对照组比较均明显升高(P=0.000);荧光染色观察到药物处理组细胞的绿色荧光随药物浓度增加而变强,红色荧光反而逐渐变弱;流式细胞术检测出SMMC-7721细胞经低、中、高浓度蟾酥注射液处理48h后,总凋亡率分别为17.33%±3.20%、25.60%±1.05%和35.76%±4.72%,与对照组比较,总凋亡率明显增加,呈浓度依赖性,差异有统计学意义(P<0.05)。结论蟾酥注射液能显著抑制人肝癌SMMC-7721细胞增殖,并诱导7721细胞凋亡。该凋亡可能与蟾酥注射液引起SMMC-7721细胞ROS水平增加、线粒体损伤以及膜电位下降有关。