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.

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.

Serum deprivation enhances DNA synthesis of human hepatoma SMMC-7721 cells

AIM To determine the relationship between serum deprivation or serum levels and cell proliferation of human hepatoma SMMC 7721 cells. METHODS Human hepatoma SMMC 7721 cells were grown in RPMI 1640 supplemented with 10% fetal calf (FCS) in 5% CO 2 incubator at 37℃ for 24h , and culture media were replaced to serum free or different serum FCS levels (2 5%, 5%, 10%, 20% and 25%). Six h, 12h , 18h and 24h after the culture, the cells were incorporated TdR for 4h . At last TdR incorporation was detected with liquid scintillation counting. RESULTS DNA synthesis of SMMC 7721 cells could be sharply stimulated by short time (6h) serum deprivation (the cpm value of 3H TdR incorporation of cells in serum free was 39 32 fold higher than cells in 25% serum), and the incorporation of 3H TdR was negatively related to the serum levels. Longer time serum starvation ( 12h , 18h and 24h ) also greatly stimulated DNA synthesis, although the cpm value of 3H TdR incroporation was less than that in 6h serum deprivation. Morphology of cells cultured in different serum levels also showed significant difference. CONCLUSIONS Compared with other cell lines such as BEL7404 and Swiss 3T3, human hepatoma SMMC 7721 cells had different response to the serum deprivation. Short time serum deprivation could greatly stimulate DNA synthesis of human hepatoma SMMC 7721 cells. Precautions must be given to the changes of serum levels for the detection of growth factors and drugs using SMMC 7721 cells as a model.

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.

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.

High-density lipoprotein as a potential carrier for delivery of a lipophilic antitumoral drug into hepatoma cells

AIM: To investigate the possibility of recombinant highdensity lipoprotein (rHDL) being a carrier for delivering antitumoral drug to hepatoma cells. METHODS: Recombinant complex of HDL and aclacinomycin (rHDL-ACM) was prepared by cosonication of apoproteins from HDL (Apo HDL) and ACM as well as phosphatidylcholine. Characteristics of the rHDL-ACM were elucidated by electrophoretic mobility, including the size of particles, morphology and entrapment efficiency. Binding activity of rHDL-ACM to human hepatoma cells was determined by competition assay in the presence of excess native HDL. The cytotoxicity of rHDL-ACM was assessed by MTT method. RESULTS: The density range of rHDL-ACM was 1.063-1.210 g/mL, and the same as that of native HDL. The purity of all rHDL-ACM preparations was more than 92%. Encapsulated efficiencies of rHDL-ACM were more than 90%. rHDL-ACM particles were typical sphere model of lipoproteins and heterogeneous in particle size. The average diameter was 31.26±5.62 nm by measure of 110 rHDL-ACM particles in the range of diameter of lipoproteins. rHDL-ACM could bind on SMMC-7721 cells, and such binding could be competed against in the presence of excess native HDL. rHDL-ACM had same binding capacity as native HDL. The cellular uptake of rHDL-ACM by SMMC-7721 hepatoma cells was significantly higher than that of free ACM at the concentration range of 0.5-10 μg/mL (P<0.01). Cytotoxicity of rHDL-ACM to SMMC-7721 cells was significantly higher than that of free ACM at concentration range of less than 5 ug/mL (P<0.01) and IC50 of rHDL-ACM was lower than IC50 of free ACM (1.68 nmol/L vs3 nmol/L). Compared to L02 hepatocytes, a normal liver cell line, the cellular uptake of rHDL-ACM by SMMC-7721 cells was significantly higher (P<0.01) and in a dose-dependent manner at the concentration range of 0.5-10 μg/mL.Cytotoxicity of the rHDL-ACM to SMMC- 7721 cells was significantly higher than that to L02 cells at concentration range of 1-7.5μg/mL (P<0.01). IC50 for SMMC-7721 cells (1.68 nmol/L) was lower than that for L02 cells (5.68 nmol/L), showing a preferential cytotoxicity of rHDL-ACM for SMMC-7721 cells. CONCLUSION: rHDL-ACM complex keeps the basic physical and biological binding properties of native HDL and shows a preferential cytotoxicity for SMMC-7721 hepatoma to normal L02 hepatocytes, HDL is a potential carrier for delivering lipophilic antitumoral drug to hepatoma 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.

Inhibitory activity of polysaccharide extracts from three kinds of edible fungi on proliferation of human hepatoma SMMC-7721 cell and mouse implanted S180 tumor

AIM To determine the activities ofpolysaccharide extracts from Flammulina velutipes (Curt. ex Fr. ) Sing (FV), Lentinusedodes (LE) and Agaricus bisporus Sing (AB)on the proliferation of human hepatoma SMMC-7721 cells in vitro and on mouse implanted S-180tumors in vivo.METHODS The polysaccharide extracts were isolated from the fruit bodies of FV, LE and AB by the methods of hot-water extraction, Sevag’sremoval of proteins, ethanol precipitation,trypsin digestion and ethanol fractionalprecipitation. Human hepatoma SMMC-7721 cells were treated with 50 mg/L Polysaccharide extracts, and the mitosis index, mitochondria activity and cell proliferation were detected at different times in both control and experimental groups. The mice with S-180 implanted tumors were injected with the polysaccharide extracts at 24 mg/ kg body weight for 9 d and the tumorweight was measured on the 15th day.RESULTS The mitosis index of hepatoma cells in vitro could be significantly decreased by treatment with the polysaccharide extracts fromthe three kinds of edible fungi (P < 0 .005 ). Thecell numbers and mitochondria activity of SMMC7721 cells treated with polysaccharide extracts were lower than those in control groups (P <0.005). The inhibition rates of polysaccharide extracts against implanted S-180 tumors in mice were 52.8%, 56.6% and 51 .9% respectivelycompared with that in c0ntrol gr0ups.CONCLUSI0N The POIysaccharide extractsfrom the three kinds of edible fungi could inhibitnot only the Cultured malignant cells in vitfO butalso impIanted Sl80 tum0r i0 vivo.

Docetaxel shows radiosensitization in human hepatocellular carcinoma cells

AIM: To determine the radiosensitizing potential of docetaxel in human hepatocellular carcinoma SMMC-7721 cells and its mechanisms.METHODS: SMMC-7721 cells were incubated with docetaxel at 0.125, 0.25, and 0.5 nmoL/L for 24 h and at 0.125 and 0.25 nmol/L for 48 h before irradiation. Radiation doses were given from 0 to 10 Gy. Cell survival was measured by a standard clonogenic assay after a 9-d incubation. The reactive oxygen species (ROS) and glutathione (GSH) are detected after being given the same dose of docetaxel for the same time. RESULTS: The sensitization enhancement ratios (SER) for SMMC-7721 cells determined at the 50% survival level were 1.15, 1.21 and 1.49 at 0.125, 0.25, and 0.5 nmol/L for pre-incubation of 24 h, respectively; the SER were 1.42, 1.67 at 0.125 and 0.25 nmol/L, for pre-incubation of 48 h, respectively. The ROS of SMMC-7721 cells increased and GSH decreased after pretreatment with the same doses of docetaxel for 24 or 48 h.CONCLUSION: A radiosensitizing effect of docetaxel could be demonstrated unambiguously in this cell line used. In addition, our data showed that the mechanism of radiopotentiation by docetaxel probably does not involve a G2/M block in SMMC-7721 cells, and ROS generation and GSH deletion may play a key role in the radiosensitizing effect of docetaxel.

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.

白藜芦醇通过下调PRMT5表达抑制肝胆管癌SMMC-7721细胞的增殖、侵袭和细胞周期

目的:探究白藜芦醇(Res)通过调控PRMT5表达对肝胆管癌SMMC-7721细胞增殖、侵袭、细胞周期的影响及其机制。方法:常规培养正常肝细胞LO2和SMMC-7721细胞,用0、20、40、80μmol/L的Res进行处理,用qPCR法、MTT法、Transwell实验、流式细胞术和WB法分别检测Res处理后PRMT5 mRNA在LO2和SMMC-7721细胞中的表达,Res对SMMC-7721细胞增殖能力、侵袭能力、细胞周期和凋亡,以及PRMT5、cyclin D1和cyclin E1蛋白表达的影响。结果:PRMT5在SMMC-7721细胞中呈高表达(P<0.01);20、40、80μmol/L Res均能明显抑制PRMT5 mRNA和蛋白在SMMC-7721细胞中的表达(均P<0.01),抑制SMMC-7721细胞的增殖能力(P<0.01)和侵袭能力(P<0.05),阻滞SMMC-7721细胞周期于G0/G1期并促进其凋亡(P<0.01),明显抑制SMMC-7721细胞中周期蛋白cyclin D1、cyclin E1蛋白的表达(P<0.01)。结论:PRMT5在SMMC7721细胞中呈高表达,Res可有效抑制SMMC-7721细胞的增殖和侵袭能力并诱导其凋亡,其机制可能与抑制PRMT5表达相关。

蟾蜍灵对肝癌细胞SMMC 7721的细胞毒作用及生长相关基因表达的影响

为探讨蟾蜍灵的抗癌作用机理 ,以肝癌SMMC772 1细胞为靶细胞 ,应用噻唑蓝还原法检测细胞毒作用 ,双荧光染色法和DNA电泳技术检测细胞凋亡与坏死 ;免疫组织化学方法检测细胞生长相关基因p2 1waf1/cip1和增殖细胞核抗原 (PCNA)蛋白表达 .结果表明 ,0 .0 1μmol·L- 1及以上浓度蟾蜍灵对SMMC772 1细胞具有显著细胞毒作用 ,形态学和DNA片段化检测证实蟾蜍灵诱导的细胞死亡以凋亡为主 ;p2 1waf1/cip1在蟾蜍灵诱导下表达上调 ,同时PCNA的表达下降 ,两者呈负相关 (P <0 .0 1) .提示蟾蜍灵通过上调p2 1waf1/cip1表达 ,下调PCNA表达 。

刺梨三萜对人肝癌SMMC-7721细胞增殖的影响

目的:观察刺梨三萜(Rosa roxburghii Tratt triterpene,RRTT)对人肝癌细胞SMMC-7721细胞增殖的影响,研究其可能的作用机制。方法:采用形态学观察和MTT法分析RRTT对SMMC-7721细胞增殖的影响;通过NBT还原实验和细胞培养上清液中甲胎蛋白(alpha-fetoprotein,AFP)含量的测定分析RRTT对SMMC-7721分化的影响;采用AO/EB染色法和FCM检测RRTT对肿瘤细胞周期和细胞凋亡的影响;RT-PCR检测Bad mRNA的表达。结果:RRTT对SMMC-7721细胞增殖的抑制作用呈时间和剂量依赖性。与阴性对照组比,随RRTT剂量的增加,NBT阳性细胞比率增加,AFP含量逐渐降低。RRTT对SMMC-7721细胞凋亡和增殖周期均无明显影响。RRTT作用后,Bad mRNA的表达下调。结论:RRTT具有体外抗SMMC-7721作用,其机制可能通过下调Bad mRNA的表达而诱导细胞分化,而与抑制细胞增殖和诱导细胞凋亡无关。

β-谷甾醇、豆甾醇诱导人肝癌细胞SMMC-7721凋亡

目的研究β-谷甾醇、豆甾醇诱导人肝癌细胞SMMC-7721的凋亡作用。方法 MTT法观察β-谷甾醇、豆甾醇对细胞增殖的抑制作用;激光共聚焦显微镜观察细胞形态变化;用流式细胞仪检测细胞周期、凋亡率、细胞内活性氧ROS、钙离子Ca2+含量、线粒体膜电位ΔΨm变化。结果β-谷甾醇、豆甾醇均明显抑制SMMC-7721细胞增殖,使细胞形态发生典型凋亡变化,凋亡率和细胞内Ca2+、ROS的含量均显著增加,线粒体膜电位降低。β-谷甾醇使细胞周期阻滞在G2/M期,而豆甾醇则同时阻滞在S期和G2/M期。结论β-谷甾醇、豆甾醇具有抑制人肝癌细胞SMMC-7721的增殖和诱导细胞凋亡的作用。

半枝莲提取物诱导人肝癌SMMC-7721细胞凋亡及其对凋亡相关蛋白表达的影响

目的探讨半枝莲提取物(Scutellaria barbata D.Don extract,SBE)对人肝癌SMMC-7721细胞凋亡及凋亡相关蛋白Bcl-2,Survivin和Caspase-3表达的影响。方法体外培养SMMC-7721细胞,以2.5,5和10 mg.L-1SBE处理48 h,并以2.5 mg.L-1顺铂(DDP)作为阳性对照。用MTT法检测细胞抑制率,流式细胞仪检测细胞凋亡率,二步法免疫组化检测Bcl-2,Survivin和Caspase-3蛋白表达。结果与正常对照组相比,SBE各浓度组细胞抑制率显著升高(P(0.001),细胞凋亡率明显上升(P(0.01),Caspase-3蛋白表达显著上升(P<0.01或P<0.05),Bcl-2和Survivin蛋白表达明显下降(P<0.01或P<0.05)。结论SBE具有诱导肝癌SMMC-7721细胞凋亡的作用,其分子机制可能与上调Caspase-3蛋白表达以及下调Bcl-2和Survivin蛋白表达有关。

Survivin反义核酸对SMMC-7721细胞增殖和凋亡的影响

Surv iv in是凋亡抑制蛋白(IAP)家族的一个成员,具有强大的抗细胞凋亡功能,在几乎所有肿瘤组织中特异性表达,而在正常成年终末分化组织中低表达甚至不表达。本研究针对Surv iv in mRNA序列设计了反义寡核甘酸,RT-PCR检测表明,该序列反义寡核苷酸可明显降低细胞中surv iv in基因的mRNA含量;W estern印迹显示Surv iv in蛋白水平也被降低。M TT比色实验法检测结果说明人Surv iv in反义寡核苷酸抑制SMM C-7721细胞增殖,抑制率为43%,远高于无义寡核苷酸组和空白对照组。反义寡核苷酸还显著增强SMM C-7721细胞对于抗肿瘤药高三尖杉酯碱的敏感性,TUNEL法检测结果显示,在较低高三尖杉酯碱浓度下,反义寡核苷酸转染细胞的凋亡率明显高于其它对照组。本研究结果提示,surv iv in表达的靶向抑制有望应用于肿瘤的辅助治疗之中。

红花多糖对人肝癌SMMC-7721细胞增殖的抑制作用

目的:观察红花多糖(Safflower polysaccharide,SPS)对SMMC-7721肝癌细胞增殖的抑制作用。方法:不同浓度SPS处理体外培养的SMMC-7721细胞株,采用MTT法测定SPS对SMMC-7721细胞增殖的影响;倒置显微镜观察细胞形态学变化;吖啶橙(AO)染色荧光显微镜观测以及Annexin-V/PI双染流式细胞仪检测各组细胞凋亡情况。结果:MTT法检测结果显示SPS对人肝癌SMMC-7721细胞体外增殖具有明显的抑制作用,该抑制作用呈明显的时间和剂量依赖性(P<0.05或P<0.01)。光镜下可见SPS组贴壁细胞数明显减少,细胞变小、变圆,折光性差,贴壁不牢,悬浮细胞增多。AO染色荧光显微镜下观察,24h部分细胞出现胞质浓缩,体积缩小,核固缩,染色增强,荧光更为明亮,形成致密浓缩的绿色荧光等;48h和72h部分细胞可见细胞核固缩为新月状。流式细胞术结果显示细胞凋亡率随药物浓度增加亦呈增长趋势。结论:SPS能显著抑制人肝癌细胞SMMC-7721生长且呈明显的量效和时效关系。SPS可诱导肝癌SMMC-7721细胞凋亡,具有一定的剂量依赖性。

壳寡糖抑制肝癌细胞SMMC-7721的增殖及其机制探讨

探讨壳寡糖抑制人肝癌细胞株SMMC-7721的增殖作用及其分子机制。采用噻唑蓝(MTT)法检测壳寡糖的细胞增殖抑制作用;利用流式细胞仪检测肝癌细胞的凋亡情况;用RT-PCR和Western blot方法研究壳寡糖引起凋亡的原因。结果显示,0.8mg/mL的壳寡糖能够抑制SMMC-7721细胞增殖,并且促进SMMC-7721细胞的凋亡,其原因是壳寡糖能够上调促凋亡蛋白Bax的表达。