表达IL-24基因的溶瘤腺病毒对肝癌细胞的抑制作用

目的 研究携带IL-24基因的溶瘤腺病毒对肝癌细胞抑制生长和转移的作用.方法 构建Ad.HS4.AFP.E1A/IL-24,病毒的复制由人甲胎蛋白启动子控制,携带IL-24基因.检测病毒在不同细胞系中的选择性复制,以及对高转移潜能人肝癌细胞系MHCC97-H的生长抑制、诱导凋亡和抑制转移能力(侵袭、运动、黏附)的作用.结果 Ad.HS4.AFP.E1A/IL-24在肝癌细胞SMMC-7721、Hep3B和MHCC97-H中选择性表达,而不影响正常肝细胞L02(P＜0.05).Ad.HS4.AFP.E1A/IL-24可明显抑制MHCC97-H细胞的增殖,诱导其凋亡,并抑制其体外运动、侵袭和黏附能力(P＜0.01).RT-PCR和明胶酶谱显示其抑制肝癌作用与抑制MMP-2的表达有关.结论 携带IL-24基因的溶瘤腺病毒能够选择性抑制肝癌细胞的增殖并抑制其转移.

Abstract：

Objective To investigate the selective oncolytic role and antitumor action of a novel recombinant adenovirus containing E1A and IL-24 on hepatocellular carcinoma cell(HCC). Methods The recombinant adenovirus expressing IL-24 (Ad. HS4. AFP. E1A/IL-24) was constructed by using modified human alpha-fetoprotein (HS4-AFP) promoter to drive adenovirus E1A gene and II-24 gene.Cell Counting Kit-8 were performed to test the selective cytotoxicity of the virus in hepatocellular carcinoma cell lines SMMC-7721, Hep3B, MHCC97-H and hepatocyte cell line L02 . The mRNA and protein expression of IL-24 gene were detected by RT-PCR and western blot. Cell growth curves and Annexin V/PI assay were used to study cell proliferation and apoptosis of MHCC97-H. The anti-metastatic effects of the recombinant adenovirus were evaluated in cell adhesion, migration, and cell motion. Matrix metalloproteinase-2 (MMP-2) expression was examined by RT-PCR and zymography.Results Selective replications of Ad. HS4. AFP. E1A/IL-24 adenovirus were observed in over expression AFP cell line MHCC97-H, a highly metastatic potential HCC cell line but not in hepatocyte cell line L02. The mRNA and protein of IL-24 were also over expressed in MHCC97-H. This recombinant adenovirus also showed the significant oncolytic action on MHCC97-H but not on L02 (P＜0. 05). Besides, the recombinant adenovirus significantly inhibited MHCC97-H metastatic potential such as cell adhesion, migration and invasion as well(P＜0.01). Conclusion The selective oncolytic adenovirus expressing E1A and II-24 has a selective antitumor effect and play an inhibitory role in metastasis of HCC.     

携带人mda-7/IL-24基因溶瘤腺病毒SG600-IL24构建及其选择性杀伤肝癌细胞的机制研究

目的:探讨携带人mda-7/IL-24基因的溶瘤腺病毒SG600-IL24对肝癌细胞选择性杀伤效应的机制。方法:构建携带人mda-7/IL-24基因的溶瘤腺病毒SG600-IL24后,用其分别感染肝癌细胞株HepG2、HCCLM3和正常肝细胞株L02。用RT-PCR和Westernblot分别检测感染后,各细胞株STAT3以及其信号通路下游相关信号分子基因与蛋白的表达变化,以及磷酸化STAT3(p-STAT3)蛋白的表达变化。结果:成功构建携带人mda-7/IL-24基因的溶瘤腺病毒SG600-IL24载体。SG600-IL24感染后,3种细胞的mda-7/IL-24基因及蛋白表达均明显升高(均P0.05)。两种肝癌细胞感染后,STAT3的表达水平明显下调,其下游信号分子c-myc、Bcl-xl、Bcl-2、cyclin D2、survivin、MMP-2、MMP-9、XIAP、OPN、VEGF的表达水平明显下调,Bax表达明显上调,均呈一定的时间依赖趋势(均P0.05);p-STAT3蛋白在感染后上升,并在感染2 h达到峰值,随后下降。感染后,L02细胞中未见STAT3及其下游信号分子表达的变化(均P0.05)。结论:携带人mda-7/IL-24基因溶瘤腺病毒SG600-IL24选择性杀伤肝癌细胞的机制可能与其选择性抑制肝癌细胞STAT3信号通路,而对正常肝细胞不产生明显影响。     

抗肝肠钙粘连蛋白单克隆抗体对肝癌细胞生物学行为的影响

目的 观察抗肝肠钙粘连蛋白(CDH17)单克隆抗体Lic5对肝癌细胞生物学行为的影响.方法 Western blot和实时定量聚合酶链反应(PCR)检测细胞株MHCC97H、MHCC97L、PLC/PRF/5及MIHA中CDH17的表达.噻唑蓝(MTT)比色法、细胞划痕法、Transwell法及平板克隆法检测Lic5对肝癌细胞生物学行为的影响.结果 CDH17仅在细胞株MHCC97H、MHCC97L中表达,Lic5可结合肝癌细胞表面的CDH17,并抑制CDH17表达.Lic5 50mg/L组、100mg/L组、小鼠IgG组4 d细胞增殖抑制率在MHCC97H为26.1%、43.6%、6.4%,MHCC97L为26.0%、40.7%、7.7%;Lic5100mg/L组、小鼠IgG组、磷酸盐缓冲液(PBS)组48h细胞迁移抑制率在MHCC97H为36.7%、8.4%、5.6%,MHCC97L为42.3%、10.2%、7.4%(P＜0.05);穿膜细胞数在MHCC97H为(39.20±9.56)、(106.50±7.56)、(96.60±13.02)个,MHCC97L为(26.00±8.61)、(86.00±10.26)、(90.40±12.04)(P＜0.05);克隆形成数在MHCC97H为(59.30±11.68)、(141.70±19.40)、(150.30±14.64),MHCC97L为(57.20±10.21)、(132.50±9.07)、(121.70±11.93)(P＜0.01).Lic5对PLC/PRF/5及MIHA细胞的生物学行为无明显影响.结论 单克隆抗体Lic5能够下调肝癌细胞CDH17表达,抑制肝癌细胞的增殖、迁移、侵袭和克隆形成能力.

Abstract：

Objective To investigate the effect of monoclonal antibody against liver-intestine cadherin (CDH17) on the cell proliferation, migration, invasion and colony formation of hepatocellular carcinoma cell lines. Methods Hepatocellular carcinoma cell lines MHCC97H, MHCC97L, PLC/PRF/5 and MIHA were examined for CDH17 expression by Western blotting and quantitative real-time polymerase chain reaction (PGR). The combination capacity between bepatocellular carcinoma cell lines and monoclonal antibody Lic5 was detected by the way of immunofluorescence staining. The cell lines were treated with Lic5, PBS and mouse IgG respectively. Methyl thiazol tetrazolium (MTT) assay, wound healing assay, Transwell invasion assay and colony formation assay were used to study the changes in cell proliferation, migration, invasion and colony formation of hepatocellular carcinoma cell lines. Results High expression level of CDH17 was detected in MHCC97H and MHCC97L cell lines. CDH17 protein level was down-regulated but there was no significant effect on CDH17 mRNA after treatment with Lie5 in MHCC97H and MHCC97L. Cellular growth rate of MHCC97H in Lic5 (50 mg/L), Lic5 ( 100 mg/L) and mouse IgG groups was decreased by 26. 1%, 43.6% and 6. 4%, and by 26. 0%, 40. 7% and 7. 7% in MHCC97L on the 4th day respectively (P ＜0. 05 ). The inhibition rate of cell migration at 48 h was 36. 7%, 8. 4% and 5.6% in Lic5 ( 100 mg/L), mouse IgG and PBS groups in MHCC97H, and 42. 3%, 10. 2% and 7. 4% in MHCC97L respectively ( P ＜ 0. 05 ). The number of invasion cells was ( 39. 20 t 9. 56),(106.50±7.56) and (96.60±13.02) in MHCC97H, and (26.00±8.61), (86.00±10.26) and (90.40±12.04) in MHCC97L in Lic5 (50 mg/L), Lic5 (100 mg/L) and mouse IgG groups, respectively (P ＜ 0. 05 ). The number of colony formation was ( 59. 30 ± 11.68 ), ( 141.70 ± 19. 40 ) and (150.30 ±14.64) in MHCC97H, and (57.20 ± 10.21), (132.50 ±9.07) and (121.70 ±11.93) in MHCC97L in Lie5 (50 mg/L), Lic5 (100 mg/L) and mouse IgG groups, respectively (P＜ 0. 01 ).There was no significant difference between Lic5 treatment groups and controls in PLC/PRF/5 and MIHA cell lines. Conclusion The anti-CDH17 monoclonal antibody Lic5 can down-regulate CDH17 expression and inhibit the cell proliferation, migration, invasion and colony formation in hepatocellular carcinoma cell lines.     

Mir-145在肝癌细胞及肝癌组织中的表达及其意义

目的 观察微小RNA(miRNA)mir-145在正常胚肝细胞株L02、肝癌细胞株MHCC97和SMMC7721中的表达,同时检测该miRNA在正常肝组织及肝细胞癌组织中的表达,探讨其在肝癌发生发展中的作用和意义.方法 应用实时定量聚合酶链反应(PCR)方法检测mir-145在正常细胞株及肝癌细胞株中的表达,同时收取肝细胞癌手术患者正常组织、癌周组织、癌组织,检测其表达并分析其意义.结果 mir-145在肝癌细胞(MHCC97、SMMC7721)中的表达比正常肝细胞L02显著降低(0.312±0.025、0.396±0.076、0.954±0.037,P＜0.05),在癌组织中表达显著低于正常组织与癌周组织(0.162±0.002、0.972±0.054、0.956±0.018,P＜0.05),正常组织及癌周组织比较差异无统计学意义(P＞0.05).结论 mir-145在肝癌细胞及肝癌组织中的低表达,可能与肝癌发生发展密切相关,并可能作为肝癌的诊断及预后的指标.

Abstract：

Objective To explore the role of miR-145 in human hepatocellular carcinoma ( HCC). We investigate the expression of miR-145 in human embryonic hepatocytes ( L02 cells),hepatocellular carcinoma cell lines (MHCC97 ,SMMC7721) ,HCC tissues and normal liver. Methods We detected the expressions of miR-145 in human embryonic hepatocytes, hepatocellular carcinoma cell lines ( MHCC97,SMMC7721) ,HCC tissues,cancer organizations and normal liver by real-time PCR. Result The expression of miR-145 in hepatocellular carcinoma cell lines ( MHCC97,SMMC7721) is significantly lower than the human embryonic hepatocytes ( 0. 312 ± 0. 025,0. 396 ± 0. 076,0. 954 ± 0. 037, P ＜ 0. 05), and compared with the cancer organizations and normal liver,the expression of miR-145 in HCC tissues is significantly decreased (0. 162 ±0.002,0. 972 ±0.054,0.956 ±0. 018,P＜0. 05). Conclusion These results indicate that the miR-145 probably involved in HCC pathogenesis and was the indicator of diagnosis and prognosis of the HCC.     

Mir-145在肝癌细胞及肝癌组织中的表达及其意义

Objective To explore the role of miR-145 in human hepatocellular carcinoma ( HCC). We investigate the expression of miR-145 in human embryonic hepatocytes ( L02 cells),hepatocellular carcinoma cell lines (MHCC97 ,SMMC7721) ,HCC tissues and normal liver. Methods We detected the expressions of miR-145 in human embryonic hepatocytes, hepatocellular carcinoma cell lines ( MHCC97,SMMC7721) ,HCC tissues,cancer organizations and normal liver by real-time PCR. Result The expression of miR-145 in hepatocellular carcinoma cell lines ( MHCC97,SMMC7721) is significantly lower than the human embryonic hepatocytes ( 0. 312 ± 0. 025,0. 396 ± 0. 076,0. 954 ± 0. 037, P ＜ 0. 05), and compared with the cancer organizations and normal liver,the expression of miR-145 in HCC tissues is significantly decreased (0. 162 ±0.002,0. 972 ±0.054,0.956 ±0. 018,P＜0. 05). Conclusion These results indicate that the miR-145 probably involved in HCC pathogenesis and was the indicator of diagnosis and prognosis of the HCC.     

Mir-145在肝癌细胞及肝癌组织中的表达及其意义

Objective To explore the role of miR-145 in human hepatocellular carcinoma ( HCC). We investigate the expression of miR-145 in human embryonic hepatocytes ( L02 cells),hepatocellular carcinoma cell lines (MHCC97 ,SMMC7721) ,HCC tissues and normal liver. Methods We detected the expressions of miR-145 in human embryonic hepatocytes, hepatocellular carcinoma cell lines ( MHCC97,SMMC7721) ,HCC tissues,cancer organizations and normal liver by real-time PCR. Result The expression of miR-145 in hepatocellular carcinoma cell lines ( MHCC97,SMMC7721) is significantly lower than the human embryonic hepatocytes ( 0. 312 ± 0. 025,0. 396 ± 0. 076,0. 954 ± 0. 037, P ＜ 0. 05), and compared with the cancer organizations and normal liver,the expression of miR-145 in HCC tissues is significantly decreased (0. 162 ±0.002,0. 972 ±0.054,0.956 ±0. 018,P＜0. 05). Conclusion These results indicate that the miR-145 probably involved in HCC pathogenesis and was the indicator of diagnosis and prognosis of the HCC.     

过氧化物酶体增殖物激活受体γ对人肝癌细胞生长和凋亡的影响及其机制

目的 检测过氧化物酶体增殖物激活受体γ(PPARγ)在人肝癌、癌旁和正常肝组织的表达,探讨激活或抑制PPARγ在肝癌细胞株生长和凋亡中的作用及其机制.方法 应用免疫组织化学方法检测20例肝癌、癌旁和正常肝组织中PPARγ的表达,Western blot检测2种肝癌和1种正常肝细胞株中PPARγ表达;PPARγ激动剂15dPGJ2和拮抗剂T0070907分别干预培养的2种肝癌细胞株,噻唑蓝(MTT)检测细胞生存率,流式细胞术(FCM)检测细胞周期及凋亡,试剂盒检测Caspase-3活性变化.结果 肝癌组织中PPARγ表达高于癌旁和正常肝组织(P＜0.05),PPARγ主要在肝癌细胞质中表达;肝癌细胞株PPARγ表达比正常肝细胞株高(P＜0.05);15dPG-J2抑制肝细胞增殖而T0070907则促进肝癌细胞增殖(P＜0.05).15dPG-J2可使肝癌HepG2和SMMC7721细胞G0/G1期细胞比例由(42.5±0.9)%和(49.0±3.8)%增高至(61.0±2.0)%和(67.5±2.2)%,(P＜0.05),S期由(30.5±0.3)%和(43.0±2.5)%降低至(6.6±1.1)%和(25.1±2.0)%(P＜0.05).而且,15dPG-J2可明显促进两种肝癌细胞凋亡,凋亡率分别增加约24.4%和22.4%,并可增强细胞Caspase-3活性(P＜0.05);Caspase抑制剂Z-VAD-FMK则可逆转15dPG-J2对肝癌细胞的促凋亡作用.结论 PPARγ在肝癌细胞中表达升高,其表达主要位于细胞质中,为无活性状态.PPARγ激动剂可活化PPARγ和Caspase通路,抑制肝癌细胞生长,促进细胞凋亡.

Abstract：

Objective To investigate the expression of peroxisome proliferator-activated receptor γ (PPARγ) in human liver cancer tissue and cells, and to explore the effects and mechanisms of PPARγ on growth and apoptosis in human hepatocellular carcinoma cells. Methods The expression of PPARγ in 20 cases of liver cancer, tumor adjacent tissue, normal liver, one liver cell line and two liver cancer cell lines were detected by immunohistochemistry or Western blotting. Two incubated malignant cell lines were exposed to PPARγ agonist 15dPGJ2 or antagonist T0070907, cell viability was determined by methyl thiazol tetrazolium (MTT) assay and cell cycle distribution and apoptosis were examined by flow cytometry (FCM). Consequently, the activity of caspase-3 following treatments of 15dPGJ2 or T0070907 was observed by the commercial Caspase-3 Activity Kit. Results The expression of PPARγin liver cancer was higher than that in adjacent and normal liver tissue ( P ＜ 0. 05) and PPART was predominantly expressed in the cytoplasm. Further,the expression of PPARγwas higher in hepatoma cell line than that in normal liver cell line (P＜ 0.05 ). PPARγ agonist 15dPG-J2 inhibited the proliferation while the antagonist T0070907 induced the growth of hepatoma cells (P ＜ 0. 05). G0/G1 phase of HepG2 and SMMC772 cells was blocked by 15dPG-J2, and the ratio were raised from (42.5 ±0.9)% and (49.0 ±3.8)% to (61.0 ±2. 0)% and (67.5 ±2. 2)% ,respectively. Meantime,S phase ratio were decreased from (30. 5 ± 0. 3 ) % and (43.0 ± 2. 5 ) % to ( 6. 6 ± 1. 1 ) % and ( 25. 1 ± 2. 0 ) %. Further, 15 dPG-J2 facilitated significant apoptosis in those cell lines and the increased apoptosis ratio were 24. 4% and 22. 4% respectively.Accordingly,the activity of Caspase-3 induced by 15dPGJ2 were 21-and 23-fold higher than those in control groups (P ＜ 0. 05 ). The Caspase inhibitor Z-VAD-fmk expectedly reversed the apoptosis induced by 15dPGJ2 in HepG2 and SMMC772 cells. Conclusion The expression of PPARγ increases in human hepatoma predominantly in cytoplasm with its inactivated form. 15dPG-J2 ,an agonist of PPART inhibits growth and induces apoptotic in hepatoma cells through activation of PPARγ pathway and the consequent Caspase3 signal.     

慢病毒介导MIM-B基因小干扰RNA增强索拉非尼对差异表达pERK人肝癌细胞的体外增殖抑制作用

目的 观察转移消失蛋白B(MIM-B)小干扰RNA(LV-siMTSS1)联用索拉非尼对差异表达磷酸化胞外信号调节激酶(pERK)肝癌(HCC)增殖的影响.方法 构建LV-siMTSS1,检测MIM-B、pERK蛋白表达.用LV-siMTSS1(1.0×107～36.0×107U/nl)、索拉非尼(0.01～30.0μmoL/L)干预细胞,计算IC50.结果 高转移潜能HCC高表达MIM-B.高转移潜能MHCC97L、MHCC97H、HCCLM3、HCCLM6相对表达pERK(0.371、0.636、0.949、1.112)与低转移潜能Hep3B、HLE、SMMC7721(0.115、0.130、0.188)比较差异有统计学意义(P＜0.05).前者对索拉非尼敏感性(IC50为13.5、12.4、10.2、8.8 μmoL/L)强于后者(IC50为26.4、20.5、18.9 μmol/L,P＜0.05);LV-siMTSS1增敏索拉非尼药效在低表达pERK的Hep3B中最显著.结论 LV-siMTSS1显著增强低表达pERK的HCC对索拉非尼药物敏感性.

Abstract：

Objective To observe in vitro effect of sorafenib combined with lentivirus-mediated small RNA interference targeting the gene of missing in metastasis B ( MIM-B,LV-siMTSS1 ) on proliferation of human hepatocellular carcinoma (HCC) cells with differential phospgorylated extracellular signalregulated kinase (pERK) expression.Methods The expression of MIM-B and pERK was detected in HCC cell lines with differential metastatic potentials.The siRNA targeting MIM-B gene was cloned to one lentivirus work vector.Work vector and three package plasmids were co-transfected into 293T cells with the help of lipefeetamine 2000 ( named LV-siMTSS1 ).The cultured cell lines were intervened by LV-siMTSS1 ( 1.0 × 107-36.0 × 107) U/ml and (or) sorafenib (0.01-30.0) μmol/L in vitro.Cellular activity was determined by Cell Counting Kit-8 to calculate IC50.Results The basal pERK and MIM-B levels were increased stepwise in cell lines in accordance with their metastatic potential.There was statistically significant difference in the pERK expression was made between the cell lines of MHCC97L,MHCC97H,HCCLM3 and HCCLM6 (0.371,0.636,0.949 and 1.112) with higher metastatic potential and those of Hep3B,HLE and SMMC7721 (0.115,0.130 and 0.188) with lower one (P＜0.05).Cells with higher pERK expression were more sensitivity ( IC50,13.5,12.4,10.2 and 8.8 μmol/L) than those with lower pERK expression ( IC50,26.4,20.5 and 18.9 μmol/L) to Sorafenib ( P＜0.05 ).Cells transfected with LV-siMTSS1 were sensitivity to Sorafenib,which was most significant in Hep3B cell line with lower pERK expression.Conclusion Transfection with LV-siMTSS1 reinforced the inhibitory effect of Sorafenib on HCC cell proliferation,especially for cells with lower pERK expression.     

9-硝基喜树碱及其脂质体对HepG2、L02细胞周期和凋亡作用的研究

目的 研究9-硝基喜树碱及其脂质体对人肝癌细胞株HepG2和人正常肝细胞L02细胞周期、凋亡的影响及其可能的作用机制.方法 HepG2、L02细胞用含不同浓度9-硝基喜树碱及其脂质体的培养液孵育后,利用MTT法测定细胞活性,流式细胞术检测细胞周期及细胞凋亡,WesternBlot验证周期相关蛋白和凋亡相关蛋白的表达变化.结果 9-硝基喜树碱及其脂质体对两种细胞生长呈时间和剂量依赖性抑制.药物处理后S期和G2/M期细胞明显增多,浓度大于0.1 μmol/L时24 h后HepG2细胞完全阻滞于S期;0.1 μmol/L孵育72 h后,超过95%HepG2细胞阻滞于G2/M期.药物对细胞凋亡的诱导作用也呈明显的剂量和时间依赖关系.Western Blot显示:Bax、Caspase3表达增高,Cyclin A、Cdk2、Cyclin E、Bcl-2表达减低.与L02相比,HepG2细胞对药物更加敏感.结论 9-硝基喜树碱及其脂质体可以通过调控细胞周期和诱导凋亡有效抑制细胞生长,其对肿瘤细胞的抑制作用强于正常肝细胞.9-硝基喜树碱脂质体体外抗肿瘤效果略强于9-硝基喜树碱单体.

Abstract：

Objective To investigate the modulating effects and explore their mechanism of 9-nitrocamptothecin and its liposomes to induce apoptosis and inhibit cell cycle in HepG2 and L02 cell lines. Methods Cells were incubated with 9-nitrocamptothecin(9NC) or with 9-nitrocamptothecin liposomes for 24 h, 48 h and 72 h, then, the cell viability was measured via MTT assay; cell cycle and apoptosis was evaluated by flow cytometry after stained by PI and Annexin V-PE/7AAD. Additional, Western Blot was used to evaluate the expression of cell cycle and apoptosis related protein. Results Both cells viability were apparently inhibited by the 9-nitrocamptothecin and 9-nitrocamptothecin liposomes, the inhibitory effect showed a time-dependent and dose-dependent manner. Both S and G2/M phases arrest were observed after incubated with drugs. HepG2 cell was completely arrested in S phase when 9NC concentration over than 0. 1 μmol/L after incubation for 24 h, while more than 95% cells arrested in G2/M phase when 9NC concentration is 0. 1 μmol/L after incubation for 72 h. Apoptosis induction effect also showed a time-dependent and dose-dependent manner. Western Blot results showed the expression of Bax and Caspase-3 were upregulated while Cyclin A, Cdk2, Cyclin E and Bcl-2 were downregulated. More importantly, the compounds were more cytotoxic to the cancer cell lines than to the normal liver cell. Conclusions 9-nitrocamptothecin and 9-nitrocamptothecin liposomes can potently inhibit cell growth via regulation of cell cycle and induction of apoptosis, and this effect was preferentially in cancer cell. Inhibitory of 9-nitrocamptothecin liposomes was slightly better than the 9-nitrocamptothecin.     

黑色素瘤分化相关基因-7和白介素-24选择性杀伤肝癌细胞和诱导增殖阻滞的体外研究

目的探讨黑色素瘤分化相关基因-7／白介素-24基因（mda-7／IL-24）对不同种类肝癌细胞的选择性杀伤作用。方法将携带人mda-7／IL-24基因的复制缺陷型腺病毒（Ad．mda-7）感染人正常肝细胞和各种肝癌细胞,通过逆转录聚合酶链反应（RT—PCR）和酶联免疫吸附（ELISA）实验观察mda-7／IL-24基因的表达,MTT法观察肝癌细胞的生长抑制,Hoeehst染色及Annexin—V和PI双染后流式细胞仪检测细胞的凋亡情况及用流式细胞仪检测细胞周期。结果RT—PCR和ELISA提示Ad．mda-7能介导外源基因mda-7／IL-24在各种肝癌细胞株和正常肝细胞中高效表达。MTT实验结果提示mda-7／IL-24能明显抑制各种肝癌细胞的生长,Hoeehst染色和流式细胞仪检测提示mda-7／IL-24能选择性杀伤肝癌细胞,细胞周期分析提示mda-7／IL-24阻滞肝癌细胞在G2／M期,同时对正常的肝细胞没有促凋亡和增殖阻滞作用。结论mda-7／IL-24基因能选择性杀伤各种肝癌细胞,促进细胞增殖阻滞及诱导细胞凋亡。     

腺病毒介导MDA-7/IL-24选择性杀伤肝癌 细胞HepG2的研究

目的 ：观察MDA-7/IL-24基因对肝癌的选择性杀伤作用，为肝癌的基因治疗提供理论基础。 方法 ：将携带人MDA-7/IL-24基因的腺病毒Ad.mda-7感染人正常肝细胞L02和肝癌细胞HepG2;用RT-PCR法观察MDA-7/IL-24基因的表达;ELISA方法检测细胞培养上清液中MDA-7/IL-24蛋白的浓度;4甲基偶氮唑蓝染色法（MTT）及Hoechst染色观察MDA-7/IL-24对肝癌细胞的生长抑制和杀伤作用;Annexin-V和PI双染后流式细胞仪检测2种细胞的凋亡;用流式细胞仪检测细胞周期。 结果 ：复制缺陷型腺病毒能介导外源基因MDA-7/IL-24在肝癌细胞株HepG2和正常细胞L02中的高效表达;细胞培养上清液中有MDA-7/IL-24蛋白的表达; MDA-7/IL-24能明显抑制肝癌细胞生长并可促进肝癌细胞的凋亡;MDA-7/IL-24阻滞肝癌细胞于G2/M期，能选择性杀伤肝癌细胞而对正常的肝细胞无阻滞作用和毒性作用。结论 ：复制缺陷型重组腺病毒载体Ad.mda-7能介导MDA-7/IL-24基因在人肝癌细胞中高效表达，促使细胞增殖阻滞及诱导肿瘤细胞凋亡，选择性地杀伤肝癌细胞HepG2，而对正常肝细胞L02无任何毒性作用。     

甲胎蛋白启动子驱动的yCDglyTK双自杀基因治疗裸鼠肝癌的机制研究

目的研究携带甲胎蛋白（AFP）启动子的酵母菌胞嘧啶脱氨酶胸苷激酶（yCDglyTK）双自杀基因体内靶向性治疗肝癌的效果和机制。方法构建携带AFP启动子的yCDglyTK双自杀基因表达质粒,通过阳离子脂质体将携带AFP启动子的yCDglyTK双自杀基因转染HepG2和SMMC7721肝癌细胞的裸鼠肝癌皮下种植瘤,观察自杀基因体内杀瘤效果以及细胞凋亡的情况。结果成功构建携带AFP启动子的yCDglyTK双自杀基因,其靶向性地在AFP阳性的HepG2细胞种植瘤上表达,而AFP阴性的SMMC7721细胞种植瘤上无表达,氟胞嘧啶（5-FC）、更昔洛韦（GCV）及两者联合可有效抑制HepG2细胞种植瘤的生长,抑瘤效果GCV＋5-FC〉5-FC〉GCV,而SMMC7721细胞种植瘤的生长未受影响。HepG2细胞种植瘤治疗后有明显的细胞凋亡,而SMMC7721细胞种植瘤内极少凋亡细胞。结论携带AFP启动子的yCDglyTK双自杀基因能有效地靶向性地杀伤AFP阳性的肝癌细胞,细胞凋亡可能是其杀伤的重要机制之一。     

黑色素瘤分化相关基因-7/白细胞介素-24促进阿霉素杀伤肝癌细胞MHCC-97L机制的研究

目的 探讨黑色紊瘤分化相关基因-7/白细胞介素-24(MDA-7/IL-24)基因促进阿霉素(ADM)杀伤肝癌细胞,逆转肝癌细胞多药耐药(MDR)的机制.方法 以人肝癌细胞株MHCC-97L为实验对象,使用噻唑蓝(MTT)比色法和流式细胞仪比较Ad. MDA-7联合ADM处理组与ADM组、Ad. MDA-7组对肝癌细胞MHCC-97L和正常肝细胞L02的作用差异.观察MDA-7/IL-24对多药耐药的逆转作用.荧光定量聚合酶链反应(PCR)检测MDR-1、STAT-3、bcl-2、bax mRNA的变化.Western blot检测gp-170、STAT-3、bcl-2、bax蛋白的表达的变化.结果 MTT表明Ad. MDA-7对正常肝细胞LO2无生长抑制作用(P>0.05).LO2细胞Ad. MDA-7联合ADM组与ADM组细胞生存率差异无统计学意义(P>0.05).低浓度(100 VP/cell)的Ad. MDA-7联合正常肝细胞的IC50浓度的ADM(1.5 mg/L)使得细胞抑制率从ADM组的17.46%上升到79.50%,生长抑制逆转4.55倍(P<0.05).MDR-1mRNA相对表达量从(16.49±0.11)下降至(5.48±0.05).STAT-3 mRNA相对表达量从(13.17±0.08)上升至(21.57±0.11).bcl-2及BAX表达与其他实验组比较差异均有统计学意义(P<0.05).联合实验组P-170蛋白的表达量较其他组明显降低,而磷酸化STAT-3蛋白的表达量亦增加.结论 Ad. MDA-7具有逆转肝癌细胞MHCC-97L多药耐药的作用,其下调MDR-1 mRNA的表达的同时,并通过活化STAT-3信号通路的表达促进肝癌细胞凋亡.     

抑制自噬对5-氟尿嘧啶治疗肝癌疗效的影响及机制研究

目的研究自噬特异性抑制剂3-甲基腺嘌呤（3-MA）对5-氟尿嘧啶（5-FU）诱导肝癌细胞系SMMC7721凋亡的影响,并初步探讨其机制。方法利用单丹（磺）酰戊二胺（MDC）染色技术,在荧光显微镜下对细胞自噬进行定性观察;以CCK8法检测3-MA抑制细胞自噬前后经5-FU诱导SMMC7721细胞的存活,凋亡以AnnexinⅤ/PI流式细胞分析法检测;以Western blot法分别检测自噬特异性蛋白LC3及凋亡蛋白caspase-3活化片段和PARP裂解片段的表达。结果 5-FU处理肝癌SMMC7721细胞48 h后,可诱导其发生自噬,细胞存活率为（60.73±2.65）%,凋亡率为（40.42±2.34）%;联合应用3-MA处理48 h后,可使肝癌SMMC7721细胞存活率明显降低（P〈0.01）,为（42.31±1.32）%,而细胞凋亡率显著增加（P〈0.01）,为（60.92±2.99）%,同时引起自噬特异性蛋白LC3-Ⅱ及凋亡蛋白caspase-3活化片段和PARP裂解片段表达增加,其灰度值比较差异均有统计学意义（均P〈0.01）。结论自噬在5-FU诱导肝癌细胞系SMMC7721凋亡过程中起保护性作用,抑制自噬可提高肝癌SMMC7721细胞对5-FU的敏感性,其可能主要通过激活caspase-3及剪切PARP来实现的。因此,自噬特异性抑制剂3-MA可能为提高肝癌对5-FU的敏感性提供新思路。     

新型增殖性腺病毒的构建及对肝癌细胞的抑制

目的 构建携带p53基因新型增殖性腺病毒CNHK600-p53,研究其对肝癌细胞株抑制效应是否优于Ad-p53.方法 PCR扩增p53基因,利用酶切连接方法 将其插入CNHK600载体,PCR鉴定.经293细胞包装成病毒,抽提病毒DNA,PCR鉴定.氯化铯密度梯度离心法纯化病毒,TCID50 方法 测病毒滴度.病毒增殖实验检测病毒在不同细胞增殖能力.四甲基偶氮唑盐(methyl-thiazolyl tetrazolium assay,MTT)法观察CNHK600-p53、Ad-p53两种病毒分别对肝癌细胞株的抑制率.结果 成功构建新型增殖性腺病毒载体CNHK600-p53;293细胞包装成病毒,PCR方法 鉴定无野生型病毒存在;病毒滴度为1.99×10~（10）pfu/ml;CNHK600-p53在肝癌细胞HepG2、SMMC-7721内复制能力明显高于正常肝细胞HEL-1和L02.对6种肝癌细胞(PLC/PRF5、SMMC7721、HepaG2、BEL-7402、BEL-7404、QGY-7703)而言,随着MOI值的不断增高.其对肝癌细胞的抑制作用也不断增强;在相同MOI情况下,CNHK600-p53组较Ad-p53组的细胞抑制率高(P＜0.05).当细胞抑制率达到80%以上时.两组之间差异无统计学意义(P＞0.05).结论 利用新型增殖性腺病毒CNHK600一p53较 Ad-p53能更有效的抑制肝癌细胞,可能成为肝癌的基因治疗更有效的一种基因治疗手段.     

miR-1246在肝癌组织中的表达及其对人肝癌细胞增殖和凋亡的影响

目的 观察微小RNA-1246（miR-1246）在肝癌组织中的表达及其对人肝癌细胞增殖和凋亡的影响,探讨其在肝癌发生发展中的作用和意义。方法应用实时定量PCR（qRT-PCR）方法检测miR-1246在肝癌以及癌旁组织的表达;对人肝癌细胞株（BEL7402、SMMC7721）转染miR-1246 抑制剂后,采用MTT法观察肝癌细胞的增殖活性,流式细胞仪检测细胞凋亡的变化。结果 miR-1246 在肝癌组织中表达显著高于癌旁组织[（65.39±8.77）vs（10.23±2.58）,P=0.002]。MTT和凋亡实验结果显示,与阴性对照组相比,转染miR-1246抑制剂后,BEL7402细胞增殖能力下降,凋亡增加（P均＜0.05）;SMMC7721细胞也出现增殖能力下降,凋亡增加（P均＜0.05）。结论 miR-1246 在肝癌组织中高表达,并且与肝癌细胞的增殖及凋亡有关,其表达的上调可能与肝癌的发生发展有关。