Establishment and characterization of four human hepatocellular carcinoma cell lines containing hepatitis B virus DNA

AIM To investigate the characteristics of newly established four hepatocellular carcinoma cell lines (SNU 739, SNU 761, SNU 878 and SNU 886) from Korean hepatocellular cancer patients. METHODS Morphologic and genetic studies were done. RESULTS All four lines grew as a monolayer with an adherent pattern, and their doubling times ranged from 20 to 29 hours. The viability rate was relatively high (88%-94%). Neither mycoplasmal nor bacterial contamination was present. The lines showed different patterns in fingerprinting analysis. The hepatitis B virus (HBV) DNA was integrated in the genomes of all four lines, and in all of them HBx, HBc and HBs transcripts were detected by reverse transcriptase PCR methods. Among the three cell lines used as control (Hep 3B, SK Hep1 and Hep G2), only Hep 3B showed HBx expression, and this line was used as a HBV integrated control. The RNA of albumin was detected in three lines (SNU 761, SNU 878 and SNU 886), that of transferrin in two lines (SNU 878, SNU 886), and that of IGF Ⅱ was detected in none of the cell lines. CONCLUSION These well characterized cell lines may be very useful for studying the biology of hepatocellular carcinoma in association with the hepatitis B virus.

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

Metastatic human HCC model is needed for the studies on mechanism and intervention of metastatic recurrence. By using orthotopic implantation of histologically intact tissues of 30 surgical specimens, a patient-like metastatic 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 with transplanted LCI-D20 tumors exhibited extremely high metastatic ability including spontaneous metastasis to liver, lungs, lymph nodes and peritoneal seeding. Remarkable difference was also found in expression of some of the invasiveness related genes and growth factors between the LCI-D20 and LCI-D35 tumors. PAI-1 increased gradually following tumor progression in LCI-D20 model, and correlated with tumor size and AFP level. Phasic expression of tissue intercellular adhesion molecule-1 in this model was also observed. Using corneal micropocket model, it was demonstrated that the vascular response induced by LCI-D20 tumor was stronger than that induced by LCI-D35 tumor. Similar report on metastatic human HCC model in nude mice and human HCC cell line with metastatic potential was rarely found in the literature. This LCI-D20 model has been widely used for the studies on intervention of metastasis, including anti-angiogenesis,antisense approach, metalloproteinase inhibitor, differentiation inducer, etc. It is concluded that the establishment of metastatic human HCC model in nude mice and human HCC cell line with metastatic potential will provide important models for the in vitro and in vitro study of HCC invasiveness, angiogenesis as well as intervention of HCC recurrence.

Potential roles of EZH2, Bmi-1 and mi R-203 in cell proliferation and invasion in hepatocellular carcinoma cell line Hep3B

AIM: To investigate the potential roles of enhancer of zeste homolog2(EZH2), Bmi-1 and mi R-203 in cell proliferation and invasion in hepatocellular carcinoma(HCC) cell line Hep3 B.METHODS: A total of 73 patients who underwent surgical resection at Fuzong Clinical Medical College of Fujian Medical University were enrolled in this study. Hep3 B cells were cultivated in RPMI 1640 medium supplemented with 10% fetal bovine serum at 37?℃. Vectors that containing c DNA of the EZH2 gene or mi R-203 targeted sh RNA plasmid were constructed, and then transfected into Hep3 B cells. The m RNA expression of mi R-203, EZH2, and Bmi-1 was analyzed using quantitative real-time polymerase chain reaction analysis, and the protein levels of EZH2 and Bmi-1 were detected by Western blot analysis. Effect of EZH2 or mi R-203 on cell proliferation was observed by methyl thiazolyl tetrazolium assay, and cell apoptosis was assessed using flow cytometry. Besides, effect of EZH2 or mi R-203 on tumor cell invasion was detected using Transwell assay.RESULTS: The m RNA levels of EZH2 and Bmi-1 in HCC tissues and in Hep3 B cells were significantly higher compared with those in normal samples(P < 0.01), while mi R-203 level was significantly lower in HCC tissues(P < 0.01). Hep3 B cells transfected with EZH2-sh RNA or mi R-203-sh RNA showed lower expression levels of EZH2 and Bmi-1(P < 0.05). Compared with controls, Hep3 B cells transfected with EZH2-sh RNA had relative slow cell proliferation, indicating that low expression of EZH2 and Bmi-1 and overexpression of mi R-203 could inhibit Hep3 B cell proliferation(P < 0.05). The average apoptosis rate of Hep3 B cells transfected with EZH2-sh RNA vector was about 18.631%, while that of Hep3 B cells transfected with sh RNA vector was about 5.33%, suggesting that EZH2 was down-regulated by transfecting with EZH2-sh RNA, and the down-regulated EZH2 contributed to the cell apoptosis. Low expression of EZH2 and Bmi-1 and overexpression of mi R-203 could reduce Hep3 B cell invasion(P < 0.05).CONCLUSION: Our study suggests that EZH2 and Bmi-1 are up-regulated while mi R-203 is downregulated in Hep3 B cells. Mi R-203 may contribute to the metastasis and enhance apoptosis of HCC cells by regulating EZH2 and Bmi-1. Our study may provide a theoretical basis for metastasis of HCC and targeted therapy of HCC.

Construction of cell lines with CD44 cDNA and its application in hepatocellular carcinoma

ＣｏｎｓｔｒｕｃｔｉｏｎｏｆｃｅｌｌｉｎｅｓｗｉｔｈＣＤ４４ｃＤＮＡａｎｄｉｔｓａｐｐｌｉｃａｔｉｏｎｉｎｈｅｐａｔｏｃｅｌｕｌａｒｃａｒｃｉｎｏｍａＸＩＡＯＣｈｅｎｇＺｈｉ，ＤＡＩＹｉＭｉｎ，ＹＵＨｏｎｇＹｕ，ＷＡＮＧＪｉａｎＪｕｎ，ＮＩＣ...

Biological effect of ectopic expression of angiopoietin-1 and -2 in hepatocellular cell line carcinoma cell line

OBJECTIVES: To observe the biological effect of ectopic expression of angiopoietin-l and -2 cDNA onSMMC7721 hepatocellular carcinoma cell line and study the possible role of the angiopoietin gene in thegrowth or metastasis of implantation carcinoma.METHODS: Angiopoietin-1 and -2 cDNA were subcloned into the pcDNA3 vector and subsequentlytransfected into a human SMMC7721 hepatocellular carcinoma (HCC) cell line without detectableangiopoietin gene expression before transfection. Then HCC cells were injected subcutaneously into 30nude mice and the tumor growth speed and amount of newborn vasculature in the HE stained tissue wereobserved every 2 days till 3 weeks or the death of animals.RESULTS: The tumor grew faster with angiopoietin-2 expression; much more blood vessels were seen inthe tumor tissue than that without angiopoietin-2 expression. Angiopoietin-1 gene expression seems to haveno obvious effect on the increase of vasculature and tumor growth.CONCLUSIONS: The angiopoietin gene may play a role in the growth and progression of HCC andangiopoietin-2 seems to promote the angiogenesis of the tumor.

STUDY ON THE EXPRESSION OF CYCLOOXYGENASE-2 IN HEPATOCELLULAR CARCINOMA CELL LINES AND ON THE GROWTH INHIBITION EFFECT OF NS-398

Objective： To investigate the expression of cyclooxygenase -2 （COX-2） in hepatocellular carcinoma cell lines and to explore the effect of NS-398, a selective inhibitor for COX-2, on HepG-2 cell line. Methods： lmmunohistochemistry and RT-PCR were used to investigate COX-2 expression in 6 HCC cell lines. MTT and Flowcytometry were used to evaluate the effect of the selective inhibitor of COX-2, NS-398, on HepG-2 cell lines. Results： All six HCC cell lines showed COX-2 expression at protein level. Five out of 6 cell lines showed COX-2 expression at mRNA level. NS-398 could suppress the growth of HepG-2 cell line, in a time and dose dependant manner. Conclusion： NS-398, a selective inhibitor of COX-2, showed inhibition effect on HepG-2 HCC cell line. The efficacy of inhibition was time and dose dependent, providing a new evidence for chemoprovention of hepatocellular carcinorma with COX-2 selective inhibitors.

Establishment of the human hepatocellular carcinoma cell line HCC－9204 and its characteristics

This study was aimed at providing an experimental model for the research of HCC. Twelve specimens that were pathologically identified as HCC were cultured in vitro . To investigate their biological characteristics, the survived cells were morphologically

Pharmacological Isolation of Experimental Models of Drug-resistant Hepatocellular Carcinoma Cell Line

Drug resistance is one of the major challenges facing the success of chemotherapy against human hepatocarcinoma (HCC) as well as other types of cancer. Studies with cell lines can serve as initial screening for agents that could modulate drug resistance. Development of a good experimental model of drug-resistant cells is a prerequisite for the success of such cellular studies;but could be laborious and generally time-consuming. Additionally, the high mortality rate associated with advanced HCC calls for a probe into the mechanism of resistance by developing experimental model that mimics clinical method of its treatment. Consequently, we have reported a simplified method of selection of drug-resistant hepatocarcinoma cells from human hepatocellular carcinoma (HEPG2) cell line using pharmacologic agents, cisplatin (CDDP) and 5-fluorouracil (5-FU). HEPG2 cell line was incubated for 24 hours with different concentrations of CDDP (0 - 20 μM) or 5-FU (0 - 100 μM). Cell viability was assayed by CCK-8 (Cell Counting Kit) analysis, and the inhibitory concentrations (IC50) for CDDP and 5-FU were established by dose-dependent cytotoxicity curves. The IC50(s) were confirmed by flow cytometric analysis of cell death due to CDDP or 5-FU. Clinical method of treatment was imitated by treating the parental HEPG2 cell line in pulse, at the optimal concentration of either CDDP or 5-FU for 4 to 6 hours. Induction was repeated 6 times, whilst allowing the cells to attain at least 70% confluence between intervals of induction. The resultant drug-resistant sublines, (HEPG2CR) and (HEPG2FR) were found to be stable after over 3 months of drug withdrawal and maintenance in drug-free medium. This was done with the views of establishing a simple, efficient and direct protocol for the development of good cellular models for the study of drug resistance in liver cancer, with possible application in other cancer types.

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.

Effect of cell fusion on metastatic ability of mouse hepatocarcinoma cell lines

AIM To study the effect of cell fusion on metastatic ability of mouse hepatocarcinoma cells and the factors involved in the process of metastasis. METHODS By the method of successively increasing the concentrations, cell fusion and limit dilution, 8 Ag resistant cells were selected, and HGPRT - Hca P cells and eight cloned hybridoma cells were obtained. To observe their metastatic ability, they were inoculated into mice foodtaps and the drainage lymph nodes were examined under microscope. RESULTS The end concentration of 8 Ag which was used to select HGPRT deficient Hca P cells was 30mg/L . All the cells selected died in HAT culture medium in one week. Fused cells appeared approximately 9 days later. They were round, transparent and a little larger than their parental cells. Eight clones of hybridoma cells were obtained and named as PSH1 PSH8. The metastatic rate of HGPRT - Hca P cells and PSH7 cells was 28 6% and 71 4% respectively, the difference being significant ( P <0 05). The metastatic rate of other clones was no more than 20% and there was no significant difference from HGPRT - Hca P cells ( P >0 05). CONCLUSION In normal mice splenic lymphocytes, there are some factors that could inhibit tumor metastasis, however, there are some other factors accelerating tumor cells to metastasize. The establishment of PSH7 provides an experimental model which could be used to study the factors involved in metastasis.

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.

Connective tissue growth factor is overexpressed in human hepatocellular carcinoma and promotes cell invasion and growth

AIM:To determine the expression characteristics of connective tissue growth factor(CTGF/CCN2) in human hepatocellular carcinoma(HCC) in histology and to elucidate the roles of CCN2 on hepatoma cell cycle progression and metastasis in vitro.METHODS:Liver samples from 36 patients(who underwent hepatic resection for the first HCC between 2006 and 2011) and 6 normal individuals were examined for transforming growth factor β1(TGF-β1) or CCN2 mRNA by in situ hybridization.Computer image analysis was performed to measure integrated optimal density of CCN2 mRNA-positive cells in carcinoma foci and the surrounding stroma.Fibroblast-specific protein-1(FSP-1) and E-cadherin were examined to evaluate the process of epithelial to mesenchymal transition,α-smooth muscle actin and FSP-1 were detected to identify hepatic stellate cells,and CD34 was measured to evaluate the extent of vascularization in liver tissues by immunohistochemical staining.CCN2 was assessed for its stimulation of HepG2 cell migration and invasion using commercial kits while flow cytometry was used to determine CCN2 effects on HepG2 cell-cycle.RESULTS:In situ hybridization analysis showed that TGF-β1 mRNA was mainly detected in connective tissues and vasculature around carcinoma foci.In comparison to normal controls,CCN2 mRNA was enhanced 1.9-fold in carcinoma foci(12.36 ± 6.08 vs 6.42 ± 2.35) or 9.4-fold in the surrounding stroma(60.27 ± 28.71 vs 6.42 ± 2.35),with concomitant expression of CCN2 and TGF-β1 mRNA in those areas.Epithelial-mesenchymal transition phenotype related with CCN2 was detected in 12/36(33.3%) of HCC liver samples at the edges between carcinoma foci and vasculature.Incubation of HepG2 cells with CCN2(100 ng/mL) resulted in more of the cells transitioning into S phase(23.85 ± 2.35 vs 10.94 ± 0.23),and induced a significant migratory(4.0-fold) and invasive(5.7-fold) effect.TGF-β1-induced cell invasion was abrogated by a neutralizing CCN2 antibody showing that CCN2 is a downstream mediator of TGF-β1-induced hepatoma cell invasion.CONCLUSION:These data support a role for CCN2 in the growth and metastasis of HCC and highlight CCN2 as a potential novel therapeutic target.

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.

Primmorph extracts and mesohyls of marine sponges inhibit proliferation and migration of hepatocellular carcinoma cells in vitro

Cancer recurrence and severe side effects of currently being used chemotherapeutic agents reduce their clinical efficacy. Thus, there is a constant need to develop alternative anticancer drugs. Sustainable supply is an important challenge facing marine-based drug discovery. Primmorph, a 3D cell culture system, could provide a sustainable source to produce metabolites for anticancer drugs from marine sponges. In the present work, the anticancer activity of primmorph extracts and mesohyls of Negombata magnifica, Hemimycle arabica, Crella spinulata, and Stylissa carteri sponges was evaluated. Antiproliferative activity was studied in terms of cytotoxicity, colony formation, cell cycle, and apoptosis. Migration was assessed by migration assay and matrix metalloproteinase activity. The expression of proliferation and migration-related genes was analyzed using real time PCR. Migration and proliferation activities of HepG2 cells were inhibited by treatment with primmorph extracts and mesohyls of N. magnifica, H. arabica, and C. spinulata. The mesohyl of S. carteri did not show any anticancer activity although the primmorph extract led to cell cycle arrest. Among the selected sponge species, the primmorph extract of C. spinulata was the most promising anticancer agent regarding antiproliferative and antimigratory activities. In addition, primmorph extracts have the advantage of working under welldefined and controlled conditions, which allows the easy application as a bioreactor.

Effect of 5-Aza-2'-deoxycytidine on the expression of p16 in hepatocellular carcinoma cells in vitro

Objective: To study the effect of 5-Aza-2’ -deoxycytidine (5-Aza-cdR) on tumour suppressor gene p16 expres- sion in hepatocellular carcinoma cells. Method: Expression of pl6 mRNA and protein in hepatocellular carcinoma cell lines SMMC-7721 and HePG2 before and after treatment with 5-Aza-cdR were analyzed via reverse transcriptase polymerase chain reaction(RT-PCR) and immunohistochemistrty Results: The expression levels of p16 mRNA and protein were increased dramatically after treatment with 5-Aza-cdR. Conclusion: Our data show that, 5-Aza-2’ -deoxycytidine can increase the expression of pl6 gene both at transcription and translation. The findings suggested that 5-Aza-cdR may reactivate the pl6 gene by demethylation.

转染HBx诱导肝癌细胞株Bel-7404多药耐药的初步研究

目的研究HBx转染对肝癌细胞株Bel-7404增殖、细胞周期以及多药耐药的影响,并探讨HBx转染诱导肝癌多药耐药发生的可能机制。方法选用人肝癌Bel-7404细胞株进行转染,根据HBx转染情况将细胞分为三组,分别为转染HBx细胞组(Bel-7404-HBx组)、转染空载体细胞组(Bel-7404-con组)和空白细胞组(Bel-7404组);实时定量PCR检测各组细胞中HBx RNA的表达。Western blot法检测各组细胞中HBx、Notch-1和多药耐药蛋白(MRP)的表达,CCK-8法检测各组细胞增殖活性和多药耐性,流式分析仪检测各组细胞生长周期。结果 PCR扩增凝胶电泳显示Bel-7404-HBx组有HBx片段出现,而其他两组未见HBx m RNA的表达;Western bolt结果显示在Bel-7404-HBx组处有蛋白条带(即HBx蛋白),而Bel-7404组和Bel-7404-con组未见表达。与Bel-7404组和Bel-7404-con组比较,Bel-7404-HBx组细胞增殖显著加快(P<0.05);与Bel-7404组和Bel-7404-con组比较,Notch-1和MRP在Bel-7404-HBx组的蛋白表达增加;细胞周期结果显示,与Bel-7404组和Bel-7404-con组比较,Bel-7404-HBx组G_0/G_1期细胞显著减少(P<0.05),S期显著增加(P<0.01),G_2/M期变化不大(P>0.05);多药耐药实验显示,与Bel-7404组和Bel-7404-con组比较,丝裂霉素、阿霉素、5-氟尿嘧啶、顺铂和奥沙利铂在Bel-7404-HBx组中耐药指数明显增加(P<0.05或P<0.01)。结论转染HBx的Bel-7404细胞可能通过诱导Notch-1与MRP的过表达,最终导致肝癌细胞株Bel-7404增殖能力增强和多药耐药的发生。

锌对于原发性肝细胞癌BEL-7404细胞生物学行为的影响

目的:观察外源锌对原发性肝细胞癌(HCC)BEL-7404细胞生物学行为的影响。方法:应用TSQ锌离子荧光探针、MTT法、DNA倍体法、吖啶橙/溴乙啶双荧光染色法和Transwell小室法分别检测不同浓度硫酸锌刺激下BEL-7404细胞内锌离子含量、细胞活力、细胞周期、细胞凋亡及细胞迁移和侵袭能力的变化。应用real-time PCR和Western blot法分别检测不同浓度锌离子对BEL-7404细胞白蛋白的mRNA和蛋白表达的影响。结果:随着培养环境中锌离子浓度的升高,BEL-7404细胞内的锌离子含量增加,细胞的存活率和细胞迁移与侵袭能力降低,凋亡率升高(P<0.05);G0/G1期细胞比例降低,G2/M期细胞比例升高(P<0.05);细胞白蛋白的mRNA和蛋白表达量增加(P<0.05)。结论:外源性给予锌离子可抑制HCC细胞的活力、迁移与侵袭能力,诱导细胞凋亡,阻滞细胞周期在G2/M期,并可能降低细胞的恶性表型。

白藜芦醇对肝癌细胞Bel-7402的抑制作用及其效应机制分析

目的通过体内体外实验,观察白藜芦醇(resveratrol,Res)对肝癌细胞Bel-7402的增殖抑制作用,并对其抑癌的可能效应机制进行分析。方法实验中设4个Res药物组,终浓度分别为12.5、25、50、100μmol/L,同时设置不含Res药物的对照组,采用MTT法测试Res对体外培养肝癌Bel-7402细胞的增殖抑制作用,反转录PCR(reverse transcription-PCR,RT-PCR)检测Bcl-2 mRNA的表达,Western Blot检测Bcl-2蛋白的表达,ELISA测定Res对荷瘤小鼠细胞因子水平的影响。结果与对照组相比,Res可以呈剂量和时间依赖性方式抑制肝癌Bel-7402细胞的增殖和Bcl-2 mRNA及其蛋白的表达(P<0.05)。同时Res能明显抑制荷瘤小鼠肿瘤的生长,并能明显升高荷瘤小鼠体内细胞因子IL-2、IL-6、IL-12和TNF-α的水平(P<0.05)。结论 Res体内与体外对肝癌细胞Bel-7402均有明显的增殖抑制活性,其抗肿瘤的效应机制可能与其下调Bcl-2的表达和提高细胞因子IL-2、IL-6、IL-12及TNF-α的水平有关。

人肝癌BEL-7402/5-FU多药耐药细胞株的建立及其生物学特性观察

目的:建立人肝癌BEL-7402/5-FU多药耐药细胞株。方法:采用体外低浓度梯度递增联合大剂量间断冲击的诱导方法建立5-FU获得性BEL-7402/5-FU多药耐药细胞株。MTT法检测耐药细胞株对多种化疗药物的交叉耐药性。观察其细胞形态学、生长曲线、倍增时间、平板克隆形成率、贴壁率、细胞周期分布、染色体核型以及裸鼠致瘤性。流式细胞术检测阿霉素在亲本及耐药细胞株内的积聚量。免疫细胞化学法检测胸苷酸合酶在耐药细胞内的表达。结果:成功建立人肝癌BEL-7402/5-FU多药耐药细胞株模型。该耐药细胞对阿霉素、长春新碱、奥沙利铂及甲氨蝶呤均有不同程度的交叉耐药性,但对羟基喜树碱仍较敏感。体外培养见细胞趋向群集性生长。耐药细胞株倍增时间较亲本细胞株长,克隆形成率则较亲本细胞株低,差异有统计学意义。耐药细胞贴壁率在23、h明显低于亲本细胞株,其G0/G1期细胞分布比率较低而S期比率明显增加。阿霉素在耐药细胞株内的积聚量低于亲本细胞株,耐药细胞株胸苷酸合酶的蛋白表达量较亲本细胞株明显增强。结论:人肝癌BEL-7402/5-FU多药耐药细胞株可以成为研究5-FU获得性耐药机制及开展多药耐药逆转剂筛选较好的体外模型。

胡桃醌不同给药途径对人肝癌细胞BEL-7402裸鼠皮下移植瘤生长的影响

目的采用裸鼠皮下移植瘤模型,通过不同给药途径对胡桃醌抗肿瘤活性和毒性进行评价。方法建立人肝癌BEL-7402细胞裸鼠皮下移植瘤模型,通过腹腔注射和局部注射两个给药途径观察胡桃醌抑制肿瘤生长的效果。结果①以600、300和150μg/kg胡桃醌腹腔注射于人肝癌BEL-7402细胞裸鼠皮下移植瘤模型,发现该剂量胡桃醌对肿瘤生长没有明显的影响;NK细胞活性检测发现,600、300μg/kg胡桃醌对裸鼠免疫功能有影响(P均<0.01),150μg/kg胡桃醌则没有影响(P>0.05);与阳性对照组(5-Fu)相比,600μg/kg胡桃醌组NK细胞活性差异无显著性(P>0.05),300和150μg/kg胡桃醌组NK细胞活性差异有显著性(P<0.05,P<0.01),结果提示胡桃醌对小鼠免疫系统有一定的损伤作用。②以4.5、3和1.5 mg/kg胡桃醌腹腔注射于人肝癌BEL-7402细胞裸鼠皮下移植瘤模型,抑瘤率分别为为78.24%、66.57%、48.94%;4.5、3 mg/kg胡桃醌的抑瘤作用可与阳性对照组比拟(P均>0.05)。但4.5 mg/kg胡桃醌组裸鼠出现明显的皮下脂肪减少、消瘦,并有死亡现象。③以pH 7.4和pH 4.0的600、300和150μg/kg胡桃醌人肝癌BEL-7402细胞裸鼠皮下移植瘤模型局部给药,结果发现不同pH(pH 7.4或4.0)600、300μg/kg的胡桃醌局部注射抑瘤作用与阳性对照组(5-Fu)组差异无显著性(P>0.05),而不同pH的150μg/kg胡桃醌抑瘤作用不明显。同一浓度不同pH药物的抑瘤作用差异无显著性(P均>0.05),但pH 4.0的胡桃醌组肿瘤细胞肝转移较少。结论胡桃醌不同给药途径均可抑制人肝癌BEL-7402细胞裸鼠皮下移植瘤的生长,但有一定的毒副作用,药物安全范围较小。