携带人mda-7/IL-24基因的溶瘤腺病毒SG600-IL24对肝癌细胞凋亡的影响

目的 观察携带人mda-7/IL-24的溶瘤腺病毒SG600-IL24对各种不同转移潜能肝癌细胞HepG2、SMMC7721、MHCC97L和正常肝细胞LO2的作用.方法将携带人mda-7/IL-24的溶瘤腺病毒SG600-IL24分别感染人肝癌细胞系HepG2、SMMC7721、MHCC97L和正常肝细胞LO2,逆转录-聚合酶链式反应(RT-PCR)、酶联免疫吸附试验(ELISA)、Western blot检测mda-7/IL-24基因和蛋白的表达,MTT观察肝癌细胞的生长抑制,Hoechst33258和流式细胞仪(FCM)检测细胞的凋亡,流式细胞仪(FCM)检测细胞周期.结果 RT-PCR和Western blot显示mda-7/IL-24在肝癌细胞和正常肝细胞中高表达,ELISA提示细胞培养上清液中mda-7/IL-24蛋白也明显增加.MTT和流式细胞仪提示mda-7/IL-24能明显抑制肝癌细胞的生长(生长抑制率分别为75%±2.5%,86%±3.5%,72%±1.8%,HepG2∶F=5.86,SMMC7721∶F=7.98,MHCC97L∶F=5.13,均P<0.01),促进肝癌细胞的凋亡(凋亡抑制率分别为56.5%±4.0%,34.4%±2.0%,43.3%±2.5%,HepG2∶F=203.4,SMMC7721∶F=130.5,MHCC97L∶F=160.6,均P<0.01),阻滞肝癌细胞在G2/M期(G2/M期阻滞分别为35.4%±4.2%,40.5%±5.0%,42.0%±5.0%,HepG2∶F=112.5,SMMC7721∶F=133.2,MHCC97L∶F=145.5,均P<0.01),而对正常肝细胞没有明显的促进凋亡和增殖阻滞作用.结论 溶瘤腺病毒SG600-IL24能特异性杀伤不同转移潜能人肝癌细胞和诱导凋亡,促进肝癌细胞增殖阻滞,而对正常肝细胞无明显促进凋亡和增殖阻滞作用.

Abstract：

Objective To investigate the effect of oncolytic adenovirus vector SG600-IL24expressing human melanoma differentiation associated gene-7 (mda-7/IL-24) on hepatocellular carcinoma cell lines with different metastatic potential of HepG2, SMMC7721, MHCC97L and normal liver cell line LO2. Methods The oncolytic adenovirus SG600-IL24 which carrying mda-7/IL-24 gene was transfected into hepatocellular carcinoma cell lines and normal liver cell line. The mRNA and protein expression of mda7/IL-24 in HepG2, SMMC7721, MHCC97L and LO2 cell lines was confirmed by RT-PCR,ELISA assay and Western blot respectively. MTT assay and flow cytometry were used to study tumor cell proliferation and cell cycle in vitro. Hoechst33258 and flow cytometry were studied to indicate the apoptosis effects. Results It was confirmed by RT-PCR, ELISA assay and Western-blot that the exogenous mda-7/IL-24 gene was highly expressed in HepG2, SMMC7721, MHCC97L and LO2 cell lines. MTT and apoptosis detection indicated that MDA-7/IL-24 can induce the growth suppression (the inhibition rate was 75% ±2. 5% ,86% ±3. 5% ,and promotes apoptosis ( the apoptosis rate was 56. 5% ± 4. 0% , 34. 4% ± 2. 0% , 43. 3% ± 2. 5%cell lines at G2/M phase ( the blocking rate was 35. 4% ± 4. 2% , 40. 5% ± 5. 0% , 42. 0% ± 5. 0%metastatic potential hepatocellular carcinoma cell lines but not in normal liver cell line.Conclusions Oncolytic adenovirus vector SG600-IL24 can selectively induce growth suppression, promote apoptosis in hepatocellular carcinoma lines in vitro but not in normal liver cell LO2.     

Radioiodine therapy for castration-resistant prostate cancer following prostate-specific membrane antigen promoter-mediated transfer of the human sodium iodide symporter

Radioiodine therapy, the most effective form of systemic radiotherapy available, is currently useful only for thyroid cancer because of the thyroid-specific expression of the human sodium iodide symporter （hNIS）. Here, we explore the efficacy of a novel form of gene therapy using prostate-specific membrane antigen （PSMA） promoter-mediated hNIS gene transfer followed by radioiodine administration for the treatment of castration-resistant prostate cancer （CRPC）. The androgen-dependent C33 LNCaP cell line and the androgen-independent C81 LNCaP cell line were transfected by adenovirus. PSMA promoter-hNIS （Ad.PSMApro-hNIS） or adenovirus.cytomegalovirus-hNIS containing the cytomegalovirus promoter （Ad.CMM-hNIS） or a control virus. The iodide uptake was measured in vitro. The in vivo iodide uptake by C81 cell xenografts in nude mice injected with an adenovirus carrying the hNIS gene linked to PSMA and the corresponding tumor volume fluctuation were assessed. Iodide accumulation was shown in different LNCaP cell lines after Ad.PSMApro-hNIS and Ad.CMV-hNIS infection, but not in different LNCaP cell lines after adenovirus.cytomegalovirus （Ad.CMV） infection. At each time point, higher iodide uptake was shown in the C81 cells infected with Ad.PSMApro-hNIS than in the C33 cells （P 〈 0.05）. An in vivo animal model showed a significant difference in 1311 radioiodine uptake in the tumors infected with Ad.PSMApro-hNIS, Ad.CMV-hNIS and control virus （P 〈 0.05） and a maximum reduction of tumor volume in mice infected with Ad.PSMApro-hNIS. These results show prostate-specific expression of the hNIS gene delivered by the PSMA promoter and effective radioiodine therapy of CRPC by the PSMA promoter-driven hNIS transfection.     

绿脓杆菌制剂对人肝癌MHCC97L细胞增殖和侵袭能力的影响

Objective To investigate the effects of Pseudomonas aeruginosa vaccine (PA) on proliferation and invasiveness of the hepatocellular carcinoma cell line MHCC97L with metastatic potential. Methods Proliferation, growth curve, plate efficiency, flow cytometry, transwell invasion assay, cell motility assay, scarification test, vascular endothelial growth factor (VEGF) and matrix metalloproteinase-2 (MMP2) protein activity were evaluated after cells were treated with PA at various concentrations. Results PA can inhibit the proliferation and plate efficiency of MHCC97L cell markedly in a dose-dependent manner. The IC50 of cells treated with PA for 48 h and 72 h was 3.1 ×108/ml and 1.9 × 108/ml, respectively. The doubling time increased and plate efficiency decreased gradually when cells treated with 0.5 × 108/ml, 1 × 108/ml and 2 × 108/ml PA (P＜0.01). PA could induce cell cycle arrest at the G1 phase in a dose-dependent manner by flow cytometric analysis. The average amount of invading cell per field in cell invasion assay and motility assay were 4. 8 ± 1.3 and 8. 8±2.2 when cells treated with 1× 108/ml PA, which was significantly lower than that of control group (8. 6±2. 1 and 15. 6±1.2 ) (P＜0.01) Scarification test showed that the metastatic ability of cells treated with 1 × 108/ml PA significantly lower than that in the control group. Comparison between cells treated with 1 × 108/ml PA and control group, no remarkable difference was found regarding expression of VEGF and MMP2 in supernatant of cell culture. Conclusion PA can inhibit proliferation and plate efficiency of HCC cell line MHCC97L, which is in part mediated by the cell cycle arrest at the G1 phase. PA could inhibit invasiveness of HCC cell line MHCC97L, which is unrelated to the VEGF and MMP2 protein activity.     

表达端粒酶逆转录酶siRNA的溶瘤腺病毒对裸鼠肾癌移植瘤的治疗作用

Objective To investigate the antitumor effect of oncolytic adenovirus armed with small interference RNA targeting hTERT gene for renal cancer therapy. Methods Nude mice were divid-ed randomly into 4 groups (8 mice/group),and were treated by intratumoral injections of ZD55-hTERT ( an oncolytic adenovirus armed with small interference RNA targeting hTERT gene) ,ZD55-EGFP ( an on-colytic adenovirus) and Ad-hTERT (replication-defective adenovirus armed with small interference RNA targeting hTERT gene) with three consecutive daily at 7 × 108 pfu/day or treated with PBS as a control. The expression of E1A and hTERT, and apoptosis of tumor xenografts were assessed by immunohistochemi-cal technique at the 7th day after injections. The tumor volume was measured at the 50th day after injec-tions. Results The tumor volume in ZD55-hTERT treatment group ( 124.1±27.5) was significantly less than that in ZD-EGFP (499.8±77.1 ) and Ad-hTERT ( 609.0±102.5 ) treatment groups. The E 1A pos-itive expression in ZD55-hTERT treatment group was significantly higher than that in Ad-hTERT treatment group. The hTERT positive expression in ZD55-hTERT treatment group was significantly lower than that in Ad-hTERT treatment group. ZD55-hTERT treatment of tumor xenografts resulted in an increased apoptotie cell death as compared with ZD55-EGFP and Ad-hTERT treatment. Conclusion The antitumor effect of ZD55-hTERT was more potent than oneolytie adenovirus ZD55-EGFP and Ad-hTERT.     

表达端粒酶逆转录酶siRNA的溶瘤腺病毒对裸鼠肾癌移植瘤的治疗作用

Objective To investigate the antitumor effect of oncolytic adenovirus armed with small interference RNA targeting hTERT gene for renal cancer therapy. Methods Nude mice were divid-ed randomly into 4 groups (8 mice/group),and were treated by intratumoral injections of ZD55-hTERT ( an oncolytic adenovirus armed with small interference RNA targeting hTERT gene) ,ZD55-EGFP ( an on-colytic adenovirus) and Ad-hTERT (replication-defective adenovirus armed with small interference RNA targeting hTERT gene) with three consecutive daily at 7 × 108 pfu/day or treated with PBS as a control. The expression of E1A and hTERT, and apoptosis of tumor xenografts were assessed by immunohistochemi-cal technique at the 7th day after injections. The tumor volume was measured at the 50th day after injec-tions. Results The tumor volume in ZD55-hTERT treatment group ( 124.1±27.5) was significantly less than that in ZD-EGFP (499.8±77.1 ) and Ad-hTERT ( 609.0±102.5 ) treatment groups. The E 1A pos-itive expression in ZD55-hTERT treatment group was significantly higher than that in Ad-hTERT treatment group. The hTERT positive expression in ZD55-hTERT treatment group was significantly lower than that in Ad-hTERT treatment group. ZD55-hTERT treatment of tumor xenografts resulted in an increased apoptotie cell death as compared with ZD55-EGFP and Ad-hTERT treatment. Conclusion The antitumor effect of ZD55-hTERT was more potent than oneolytie adenovirus ZD55-EGFP and Ad-hTERT.     

表达端粒酶逆转录酶siRNA的溶瘤腺病毒对裸鼠肾癌移植瘤的治疗作用

Objective To investigate the antitumor effect of oncolytic adenovirus armed with small interference RNA targeting hTERT gene for renal cancer therapy. Methods Nude mice were divid-ed randomly into 4 groups (8 mice/group),and were treated by intratumoral injections of ZD55-hTERT ( an oncolytic adenovirus armed with small interference RNA targeting hTERT gene) ,ZD55-EGFP ( an on-colytic adenovirus) and Ad-hTERT (replication-defective adenovirus armed with small interference RNA targeting hTERT gene) with three consecutive daily at 7 × 108 pfu/day or treated with PBS as a control. The expression of E1A and hTERT, and apoptosis of tumor xenografts were assessed by immunohistochemi-cal technique at the 7th day after injections. The tumor volume was measured at the 50th day after injec-tions. Results The tumor volume in ZD55-hTERT treatment group ( 124.1±27.5) was significantly less than that in ZD-EGFP (499.8±77.1 ) and Ad-hTERT ( 609.0±102.5 ) treatment groups. The E 1A pos-itive expression in ZD55-hTERT treatment group was significantly higher than that in Ad-hTERT treatment group. The hTERT positive expression in ZD55-hTERT treatment group was significantly lower than that in Ad-hTERT treatment group. ZD55-hTERT treatment of tumor xenografts resulted in an increased apoptotie cell death as compared with ZD55-EGFP and Ad-hTERT treatment. Conclusion The antitumor effect of ZD55-hTERT was more potent than oneolytie adenovirus ZD55-EGFP and Ad-hTERT.     

表达端粒酶逆转录酶siRNA的溶瘤腺病毒对裸鼠肾癌移植瘤的治疗作用

Objective To investigate the antitumor effect of oncolytic adenovirus armed with small interference RNA targeting hTERT gene for renal cancer therapy. Methods Nude mice were divid-ed randomly into 4 groups (8 mice/group),and were treated by intratumoral injections of ZD55-hTERT ( an oncolytic adenovirus armed with small interference RNA targeting hTERT gene) ,ZD55-EGFP ( an on-colytic adenovirus) and Ad-hTERT (replication-defective adenovirus armed with small interference RNA targeting hTERT gene) with three consecutive daily at 7 × 108 pfu/day or treated with PBS as a control. The expression of E1A and hTERT, and apoptosis of tumor xenografts were assessed by immunohistochemi-cal technique at the 7th day after injections. The tumor volume was measured at the 50th day after injec-tions. Results The tumor volume in ZD55-hTERT treatment group ( 124.1±27.5) was significantly less than that in ZD-EGFP (499.8±77.1 ) and Ad-hTERT ( 609.0±102.5 ) treatment groups. The E 1A pos-itive expression in ZD55-hTERT treatment group was significantly higher than that in Ad-hTERT treatment group. The hTERT positive expression in ZD55-hTERT treatment group was significantly lower than that in Ad-hTERT treatment group. ZD55-hTERT treatment of tumor xenografts resulted in an increased apoptotie cell death as compared with ZD55-EGFP and Ad-hTERT treatment. Conclusion The antitumor effect of ZD55-hTERT was more potent than oneolytie adenovirus ZD55-EGFP and Ad-hTERT.     

表达端粒酶逆转录酶siRNA的溶瘤腺病毒对裸鼠肾癌移植瘤的治疗作用

Objective To investigate the antitumor effect of oncolytic adenovirus armed with small interference RNA targeting hTERT gene for renal cancer therapy. Methods Nude mice were divid-ed randomly into 4 groups (8 mice/group),and were treated by intratumoral injections of ZD55-hTERT ( an oncolytic adenovirus armed with small interference RNA targeting hTERT gene) ,ZD55-EGFP ( an on-colytic adenovirus) and Ad-hTERT (replication-defective adenovirus armed with small interference RNA targeting hTERT gene) with three consecutive daily at 7 × 108 pfu/day or treated with PBS as a control. The expression of E1A and hTERT, and apoptosis of tumor xenografts were assessed by immunohistochemi-cal technique at the 7th day after injections. The tumor volume was measured at the 50th day after injec-tions. Results The tumor volume in ZD55-hTERT treatment group ( 124.1±27.5) was significantly less than that in ZD-EGFP (499.8±77.1 ) and Ad-hTERT ( 609.0±102.5 ) treatment groups. The E 1A pos-itive expression in ZD55-hTERT treatment group was significantly higher than that in Ad-hTERT treatment group. The hTERT positive expression in ZD55-hTERT treatment group was significantly lower than that in Ad-hTERT treatment group. ZD55-hTERT treatment of tumor xenografts resulted in an increased apoptotie cell death as compared with ZD55-EGFP and Ad-hTERT treatment. Conclusion The antitumor effect of ZD55-hTERT was more potent than oneolytie adenovirus ZD55-EGFP and Ad-hTERT.     

表达端粒酶逆转录酶siRNA的溶瘤腺病毒对裸鼠肾癌移植瘤的治疗作用

Objective To investigate the antitumor effect of oncolytic adenovirus armed with small interference RNA targeting hTERT gene for renal cancer therapy. Methods Nude mice were divid-ed randomly into 4 groups (8 mice/group),and were treated by intratumoral injections of ZD55-hTERT ( an oncolytic adenovirus armed with small interference RNA targeting hTERT gene) ,ZD55-EGFP ( an on-colytic adenovirus) and Ad-hTERT (replication-defective adenovirus armed with small interference RNA targeting hTERT gene) with three consecutive daily at 7 × 108 pfu/day or treated with PBS as a control. The expression of E1A and hTERT, and apoptosis of tumor xenografts were assessed by immunohistochemi-cal technique at the 7th day after injections. The tumor volume was measured at the 50th day after injec-tions. Results The tumor volume in ZD55-hTERT treatment group ( 124.1±27.5) was significantly less than that in ZD-EGFP (499.8±77.1 ) and Ad-hTERT ( 609.0±102.5 ) treatment groups. The E 1A pos-itive expression in ZD55-hTERT treatment group was significantly higher than that in Ad-hTERT treatment group. The hTERT positive expression in ZD55-hTERT treatment group was significantly lower than that in Ad-hTERT treatment group. ZD55-hTERT treatment of tumor xenografts resulted in an increased apoptotie cell death as compared with ZD55-EGFP and Ad-hTERT treatment. Conclusion The antitumor effect of ZD55-hTERT was more potent than oneolytie adenovirus ZD55-EGFP and Ad-hTERT.     

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。     

趋化因子受体CXCR4在肝细胞癌表达及肺转移中作用的研究

目的 以人肝细胞癌高、低肺转移潜能细胞株MHCC97-H、MHCC97-L为研究对象,研究趋化因子受体CXCR4在肝细胞癌肺转移过程中的作用和意义.方法 RT-PCR和Western blotting比较MHCC97-H、MHCC97-L细胞株CXCR4 mRNA及蛋白质水平的表达.CXCR4配体SDF-1α及肺提取物趋化实验和抗体抑制实验观察SDF-1α和裸鼠肺组织匀浆液对MHCC97-H的趋化迁移作用.结果 趋化因子受体CXCR4在MHCC97-H细胞株表达低于低肺转移潜能细胞株MHCC97-L,蛋白质水平与mRNA水平一致.SDF-1α对MHCC97-H趋化实验表明在1～100 ng/ml浓度范围内均有趋化作用,在浓度为50 ng/L时趋化作用最显著(P＜0.05).肺提取物亦发现对MHCC97-H有趋化作用,作用强于MHCC97-L及DMEM组(P＜0.05).但加入CXCR4抗体后其趋化作用并未明显下调.结论 CXCR4在肝癌组织及细胞表达并可能参与肝癌肺转移,但并非肝癌细胞趋化转移的主要受体分子.     

应用活体成像技术监测联合靶向基因治疗肝癌切除术后复发转移的动物实验研究

目的应用活体成像技术监测联合靶向基因治疗防止肝癌切除后肿瘤复发或转移的效果。方法采用荧光素酶基因标记的人原发性肝癌细胞株MHCC97-H制备裸鼠人肝癌切除术后肿瘤复发转移模型。20只裸鼠随机分为对照组、联合基因组;各组于肝断面、腹膜后组织内分别注射等体积的PBS、2种联合基因rAAV/AFP/IL-24。模型制作后10d、肿瘤切除与基因治疗后21d用活体生物发光法检测肿瘤复发转移的情况。结果建立了稳定高表达荧光素酶基因MHCC97-H的人肝癌细胞株。在原位移植模型的活体成像可检测到生物发光信号。活体生物发光成像法观察到肿瘤复发转移情况:对照组检测到较多的光子数,可见明显肿瘤复发转移;联合基因组的光子数明显少于对照组(P0.05),显著降低了肿瘤复发转移率。结论采用活体成像技术比其他示踪技术有较大优势,联合靶向基因rAAV/AFP/IL-24可以明显抑制裸鼠肝癌切除术后复发转移。     

基因芯片筛选人肝癌细胞株MHCC97中血管生成拟态相关基因

目的 通过观察三维培养条件下高、低转移人肝癌细胞株MHCC97-H、MHCC97-L形成血管生成拟态(VM)的差异,探讨VM形成与细胞外基质和粘连分子相关机制.方法 建立MHCC97-H、MHCC97-L三维培养体系,倒置显微镜下观察血管样结构形成差异.以人脐静脉内皮细胞、无转移人肝癌细胞株Hep3B及正常人肝细胞株HL-7702作对照.应用细胞外基质和粘连分子基因芯片筛选MHCC97-H和MHCC97-L中差异表达的基因,并采用RT-PCR和Western blot验证芯片的结果.组间比较采用两样本t检验.结果 三维培养24h,MHC097-H形成的血管样结构长度为(474±16)mm/cm2,MHCC97-L为(320±41)mm/cm2,两者比较,差异有统计学意义(t=6.119,P＜0.05).Hep3B及HL-7702均不形成血管样结构.在113个细胞外基质和粘连分子相关基因中,MHCC97-H表达较MHCC97-L上调的有7个,下调的有3个.选取差异性表达的腱糖蛋白-C和细胞外基质蛋白1经RT-PCR及Western blot验证,结果与基因芯片结果基本一致.结论 高转移人肝癌细胞株MHCC97-H体外形成VM能力明显较低转移人肝癌细胞株MHCC97-L强,其原因可能与MHCC97-H差异表达某些细胞外基质和粘连分子相关基因有关.     

GRIM-19在肝细胞癌组织中的低表达及对其侵袭能力的影响

目的：检测GRIM-19在肝细咆癌（HCC）中的表达,分析其与HCC生物学行为的关系,并探讨GRIM-19对HCC侵袭能力的影响。方法：应用实时定量PCR技术检测83例HCC及其相对应的癌旁组织和8例正常肝组织中GRIM-19mRNA的表达,分析其与HCC临床病理因素之间的关系。用Westernblot法检测低侵袭力细胞株HL-7702、MHCC-97L和高侵袭力细胞株MHCC-97H、Huh-7中GRIM-19蛋白的表达。应用细胞转染技术将GRIM-19shRNA转入HL-7702和Huh-7,从而构建HL-7702和Huh-7的GRIM-19kd细胞系,并用Westernblot法检测转染效果。应用Transwell细胞迁移实验研究GRIM-19对HCC侵袭能力的影响。结果：实时定量PCR结果显示,83例HCC组织中有52例（62．65％）GRIM-19的表达低于相对应的癌旁组织（P〈O．01）,其表达水平也低于8例正常肝组织（P〈005）。GRIM-19的表达与HCC的TNM临床分期（P=O．011）、微血管浸润（P=O．047）和包膜浸润（P=O．013）密切相关。Westernblot显示HL-7702、MHCC-97L、MHCC-97H、Huh-7细胞系表达GRIM-19蛋白,且低侵袭力细胞株HL-7702、MHCC-97L中GRIM-19表达高于高侵袭力细胞株MHCC-97H、Huh-7。细胞侵袭实验显示GRIM-19低表达促进了HCC的侵袭能力。结论：GRIM-19在HCC的侵袭中起重要作用,可能为检测HCC的侵袭潜能提供新的研究思路。     

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。     

骨髓间充质干细胞对人肝癌细胞系MHCC97-H增殖能力的影响

目的 观察骨髓间充质干细胞(MSC)对肝癌细胞增殖能力的影响.方法 人肝癌细胞系MHCC97-H培养液中分别加入0、25%和50%MSC的条件培养基(MSC-CM),采用CyQUANT细胞增殖实验检测吸光度A值变化.在MHCC97-H细胞培养液中添加50%MSC-CM,荧光实时定量聚合酶链反应(RT-PCR)检测肿瘤增殖细胞核抗原(PCNA)、Ki-67抗原的变化.16只裸鼠皮下接种MHCC97-H细胞后,实验组经静脉注射MSC,1×106个/次,每周3次,对照组静脉注射PBS;比较肿瘤体积.结果 培养液中加入MSC-CM后A值依次为211.65±54.72、236.24±57.15和283.59±62.16(P<0.05).PCNA和Ki-67的表达水平分别升高1.8和7.0倍.实验组肿瘤体积(1745±455)mm3m大于对照组(972±568)mm3(P<0.05),肿瘤体积平均增加速度(56.0±26.1)mm3/d高于对照组(32.4±14.5)mm3/d(P<0.05).结论 骨髓间充质干细胞可促进肝癌细胞系MHCC97-H的增殖.     

白细胞介素18对肝细胞肝癌治疗的实验研究

目的研究携带白介素 18基因的腺病毒载体包装细胞对体内肝癌生长抑制作用。方法　构建白介素 18腺病毒载体 ,并进一步通过与Ad5腺病毒DNA TPC复合物同源重组 ,制备IL 18的复制缺陷性重组腺病毒 ,并对实验性肝癌大鼠进行治疗 ,观察抗癌作用。结果IL 18的复制缺陷性重组腺病毒包装细胞肝内局部或脾内注射后抑制肝癌细胞系CBRH3 的生长 ,接种CBRH3 第 1,3天注射者长期生存 ,第 5 ,7天注射者生存期延长空白组及空载体对照组注射者均见癌灶生长 [P =0 0 0 15 ,生存时间 (2 1± 4 )d]。结论肝癌局部及脾内注射IL 18的复制缺陷性重组腺病毒包装细胞能产生有效的抗癌作用 ,早期治疗优于晚期治疗 ,脾内注射安全有效。