Differentiation inducing effects of vesnarinone on human glioma cells

The effects of 3,4-dihydro-6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-2(1H)-quinolinone (vesnarinone) on the growth of glioma cells were examined in vitro. Vesnarinone at a dose of 100 mug/ml suppressed the growth of four different glioma cell lines, U-251MG, U-373MG, U-87MG and A-172, by approximately 50%, with an elongation of the cytoplasmic process on day 5 of culture. The long-term culture of U-87MG with 10 mug/ml of vesnarinone was continued up to day 34. Although growth suppression was approximately 25% on day 5, it reached over 95% on day 34. An increase in the cyclic adenosine monophosphate content of glioma cells cultured with vesnarinone was observed by enzyme-linked immunosorbent assay (ELISA). The accumulation of glial fibrillary acidic protein was observed to occur with vesnarinone by ELISA. These findings suggest that vesnarinone suppressed the growth and induced differentiation of glioma cells in vitro.     

蛇毒解聚素在裸鼠胶质瘤模型中的干预治疗作用研究

目的研究蛇毒解聚素（CN）对裸鼠人脑胶质瘤动物模型的治疗可行性,探讨蛇毒解聚素抑制U87胶质瘤裸鼠移植瘤生长的作用机制。方法建立BALB／c裸鼠U87胶质瘤移植瘤模型,将荷瘤裸鼠随机分为2组,采用间质内注射给药方法。蛇毒解聚素按40μg每次给药。定期观察肿瘤生长情况,测量肿瘤体积,绘制肿瘤生长曲线并计算抑瘤率。全部BALB／c裸鼠移植瘤石蜡标本用SP法免疫组化染色,检测移植瘤组织中的微血管计数（MVD）,Ki-67标记指数以及碱性成纤维细胞生长因子（bFGF）。结果与溶媒对照组相比,蛇毒解聚素组均能抑制肿瘤生长（P〈0．01）,其体积抑瘤率为50％,并能明显降低肿瘤微血管密度、能下调移植瘤组织中bFGF的蛋白表达及Ki-67标记指数。结论蛇毒解聚素能明显抑制U87裸鼠移植瘤生长。     

miR-103a-3p过表达靶向负调控PDK4抑制胶质瘤生长及侵袭

目的 探讨miR-103a-3p过表达对胶质瘤C6细胞恶性生物学行为的影响及对裸鼠移植瘤生长的影响。方法 体外培养鼠源性C6胶质瘤细胞,转染miR-103a-3p mimics质粒过表达miR-103a-3p,转染miR-103a-3p mimics+pcDNA-PDK4质粒分析PDK4过表达对miR-103a-3p过表达的影响;EDU法检测细胞增殖活性;qRT-PCR检测miR-103a-3p、PDK4 mRNA表达水平;流式细胞仪检测细胞凋亡率;Transwell实验检测细胞侵袭能力;免疫印迹法检测E-cadherin、N-cadherin、vimentin蛋白表达水平。取40只裸鼠,其中20只皮下注射未转染质粒的C6细胞、20只皮下注射转染miR-103a-3p mimics质粒的C6细胞构建移植瘤模型,分析miR-103a-3p mimics过表达对移植瘤生长的影响。结果 生物信息学及双荧光素酶试验证实PDK4是miR-103a-3p的靶点。过表达miR-103a-3p明显降低C6细胞PDK4、Ki67、PCNA、N-cadherin、vimentin表达水平（P<0.05）,明显抑制C6细胞增殖活性、侵袭能力（P<0.05）,明显增加C6细胞E-cadherin表达水平、细胞凋亡率（P<0.05）。过表达PDK4明显抑制过表达miR-103a-3p对C6胶质瘤细胞的作用（P<0.05）。过表达miR-103a-3p明显抑制裸鼠移植瘤生长（P<0.05）,抑制肿瘤组织PDK4、Ki67、vimentin表达（P<0.05）。结论 过表达miR-103a-3p通过靶向抑制PDK4表达,一方面抑制胶质瘤细胞增殖、促进胶质瘤细胞凋亡,从而抑制胶质瘤生长;另一方抑制胶质瘤上皮-间质转化过程,从而抑制胶质瘤细胞侵袭。     

环氧化酶-2抑制剂对裸鼠胶质瘤移植瘤Ang基因表达的影响

目的 探讨环氧化酶-2(COX-2)抑制剂尼米舒利(NIM)对裸鼠胶质瘤移植瘤血管生成素(Ang)基因表达的影响及意义.方法 人胶质瘤SHG44细胞接种于裸鼠皮下,建立裸鼠胶质瘤移植瘤模型,并按随机数字表法分为对照组(灌注等量生理盐水)和NIM治疗组[6 mg/(kg·d)],逆转录PCR技术检测移植瘤组织Ang-1、Ang-2mRNA表达,免疫组织化学染色测定肿瘤组织微血管密度(MVD),并绘制肿瘤生长曲线和计算肿瘤抑制率.结果 NIM可有效抑制移植瘤的生长,其抑瘤率为42.03%.NIM治疗组肿瘤组织Ang-2 mRNA表达水平(0.2032±0.0185)较对照组(0.6024±0.0289)明显降低,差异有统计学意义(P＜0.05);Ang-1 mRNA表达水平无明显改变,差异无统计学意义(P＞0.05);Ang-2/Ang-1 mRNA比值下降(0.5825±0.0621vs 1.5847±0.1948),差异有统计学意义(P＜0.05).NIM治疗组肿瘤组织MVD较对照组明显下降,差异有统计学意义(P＜0.05).结论 COX-2抑制剂NIM可下调Ang-2基因表达,改变Ang-2/Ang-1 mRNA比值,抑制肿瘤生长.

Abstract：

Objective To investigate the effect of nimesulide (NIM), a selective cyclooxygenase-2 (COX-2) inhibitor, on angiopoietins (Ang) gene expression of human glioma xenografts in nude mice and its significance. Methods Human SHG44 glioma cells were inoculated subcutaneously in 16 nude mice to establish xenograft models, and then these mouse models were randomly divided into NIM treatment group and control group. NIM (6 mg/kg) and saline were poured into the stomachs of the mice in each group, respectively, once daily for 35 d. The mRNA expressions of Ang-1 gene and Ang-2 gene in the xenografts were determined by RT-PCR. Microvessel density (MVD) in the xenografts was assessed by immunohistochemical technique. The tumor growth curve was drawn and the inhibition ratio of tumor growth was calculated. Results NIM could significantly inhibit the glioma xenografts growth with its inhibition rate reaching 42.03%. The mRNA expression of Ang-2 gene in NIM treatment group (0.2032±0.0185) was significantly lower than that in control group (0.6024±0.0289, P＜0.05), but that of Ang-1 gene showed no significant changes; therefore, the mRNA ratio of Ang-2/Ang-1 genes was decreased (0.5825±0.0621 vs. 1.5847±0.1948, P＜0.05). MVD in the xenografts of the NIM treatment group was significantly lower than that in the control group (P＜0.05). Conclusion NIM, by down-regulating the mRNA expression ofA ng-2 gene and changing the mRNA ratio of Ang-2/Ang-1 genes, can inhibit the tumor growth     

SEPT7基因抑制U251 MG裸鼠皮下荷瘤侵袭的体内实验研究

目的 探讨SEPT7 基因在体内抑制胶质瘤生长和侵袭的作用.方法 建立人脑胶质母细胞瘤U251细胞来源的裸鼠皮下胶质瘤模型,并给予SEPT7治疗,定期测量肿瘤体积变化,检测肿瘤组织中SEPT7以及侵袭相关蛋白MMP2、MMP9、MT1-MMP、TIMP1、TIMP2和整合素α_v β_3的表达.结果 SEPT7 显著抑制肿瘤生长.治疗组肿瘤体积明显小于对照组(P＜0.01).SEPT7 治疗组中,肿瘤组织细胞内SEPT7表达明显上调.MMP2,MMP9,MT1-MMP和整合素α_v β_3的表达下降,而TIMP1、TIMP2 的表达明显升高.结论 SEPT7基因对于胶质瘤的侵袭和生长具有抑制作用.     

反义miR-21抑制异种移植U87人脑胶质瘤生长的体内研究

目的 探讨敲低miR-21表达抑制裸鼠皮下荷U87人脑胶质瘤生长的疗效和机制.方法 原位注射miR-21反义寡聚核苷酸(AS-miR-21)治疗裸鼠皮下荷U87人脑胶质瘤.定时测量肿瘤大小评估原位注射AS-miR-21的治疗效果.使用RT-PCR和原位杂交方法 鉴定治疗后miR-21表达水平,采用HE染色和免疫组织化学染色(增殖细胞核抗原、细胞周期抑制因子-21、基质金属蛋白酶-9和隔蛋白-7)评价治疗后肿瘤生物学性状的变化,TUNEL法检测肿瘤细胞凋亡. 结果 肿瘤生长曲线显示AS-miR-21治疗组肿瘤生长速度及体积明显小于对照组与无义序列治疗组,差异有统计学意义(F=6.056,P=0.007);RT-PCR检测显示AS-miR-21治疗组miR-21表达下调为对照组的(0.031±0.008)%;原位杂交显示AS-miR-21治疗组miR-21表达水平较对照组与无义序列治疗组下调:组织病理学检测表明AS-miR-21治疗后肿瘤恶性度降低;TUNEL法检测可见AS-miR-21治疗组细胞凋亡数明显高于对照组与无义序列治疗组,差异有统计学意义(F=141.021,P=0.000). 结论 以miR-21作为靶点治疗异种移植U87人脑胶质瘤效果令人满意,miR-21可作为人脑胶质瘤基因治疗的侯选靶点.     

白藜芦醇对裸鼠U87细胞移植瘤生长及血管生成的影响

目的 研究白藜芦醇(Res)对人脑胶质瘤系U87细胞的体内抗癌活性及血管生成的影响. 方法 BALB/c裸鼠20只,背部皮下接种胶质瘤细胞U87建立皮下移植瘤模型.随机数字表法分为10、100mg/kgRes治疗组,溶剂对照组,空白对照组,每组5只.观察4组裸鼠移植瘤的生长曲线并应用免疫组织化学法检测瘤组织中微血管密度(MVD)及血管内皮生长因子(VEGF)的表达:采用原位末端标记法(TUNEL)检测瘤组织细胞的凋亡. 结果与空白对照组及溶剂对照组相比,100 mg/kg Res治疗组裸鼠移植瘤的体积、重量降低;100 mg/kg Res治疗组瘤组织中MVD、VEGF的表达明显降低,凋亡细胞数增高,差异均有统计学意义(P<0.05). 结论 Res对U87人脑胶质瘤细胞裸鼠移植瘤的生长具有明显抑制作用,这可能与Res导致U87移植瘤细胞凋亡及血管生成减少有关.     

白藜芦醇对裸鼠U87细胞移植瘤生长及血管生成的影响

目的 研究白藜芦醇(Res)对人脑胶质瘤系U87细胞的体内抗癌活性及血管生成的影响. 方法 BALB/c裸鼠20只,背部皮下接种胶质瘤细胞U87建立皮下移植瘤模型.随机数字表法分为10、100mg/kgRes治疗组,溶剂对照组,空白对照组,每组5只.观察4组裸鼠移植瘤的生长曲线并应用免疫组织化学法检测瘤组织中微血管密度(MVD)及血管内皮生长因子(VEGF)的表达:采用原位末端标记法(TUNEL)检测瘤组织细胞的凋亡. 结果与空白对照组及溶剂对照组相比,100 mg/kg Res治疗组裸鼠移植瘤的体积、重量降低;100 mg/kg Res治疗组瘤组织中MVD、VEGF的表达明显降低,凋亡细胞数增高,差异均有统计学意义(P<0.05). 结论 Res对U87人脑胶质瘤细胞裸鼠移植瘤的生长具有明显抑制作用,这可能与Res导致U87移植瘤细胞凋亡及血管生成减少有关.     

重组VEGF165-PE38融合基因对裸鼠移植性人胶质瘤血管生成的抑制作用

目的 研究血管内皮细胞生长因子(VEGF)和铜绿假单胞菌外毒素A(PE)融合基因的真核表达载体对裸鼠移植性人脑恶性胶质瘤血管生成的影响,探索抗肿瘤血管生成的新方法.方法 采用裸鼠背部皮下注射U251细胞建立移植性恶性胶质瘤模型,9 d后按随机数字表法将裸鼠分为未治疗组、PBS组、空质粒组、重组质粒组,采用HE染色观察肿瘤组织的形态学变化.免疫组织化学SP法检测胶质纤维酸性蛋白(GFAF)、CD31、PE的表达.分析肿瘤组织的微血管密度(MVD). 结果 注射后第16天重组质粒组裸鼠移植瘤体积明显小于其他3组,差异有统计学意义(P<0.05);重组质粒组裸鼠移植瘤MVD低于其他3组,差异均有统计学意义(P<0.05);重组质粒组裸鼠肿瘤组织PE呈阳性表达,而在空质粒组、PBS组及未治疗组均为阴性表达. 结论 VEGF165-PE38融合基因的表达产物对人脑恶性胶质瘤有明显的抑制作用,并能抑制肿瘤新生血管生成,可能为一种有效抗肿瘤血管治疗的新策略.     

Antisense MMP-9 RNA inhibits malignant glioma cell growth in vitro and in vivo

The matrix-degrading metalloproteinases (MMPs), particularly MMP-9, play important roles in the pathogenesis and development of malignant gliomas. In the present study, the oncogenic role of MMP-9 in malignant glioma cells was investigated via antisense RNA blockade in vitro and in vivo. TJ905 malignant glioma cells were transfected with pcDNA3.0 vector expressing antisense MMP-9 RNA (pcDNA-AS-MMP9), which significantly decreased MMP-9 expression, and cell proliferation was assessed. For in vivo studies, U251 cells, a human malignant glioma cell line, were implanted subcutaneously into 4-to 6-week-old BALB/c nude mice. The mice bearing well-established U251 gliomas were treated with intratumoral pcDNA-AS-MMP9-Lipofectamine complex (AS-MMP-9-treated group), subcutaneous injection of endostatin (endostatin-treated group), or both (combined therapy group). Mice treated with pcDNA (empty vector)-Lipofectamine served as the control group. Four or eight weeks later, the volume and weight of tumor, MMP-9 expression, microvessel density and proliferative activity were assayed. We demonstrate that pcDNA-AS-MMP9 significantly decreased MMP-9 expression and inhibited glioma cell proliferation. Volume and weight of tumor, MMP-9 expression, microvessel density and proliferative activity in the antisense-MMP-9-treated and therapeutic alliance groups were significantly lower than those in the control group. The results suggest that MMP-9 not only promotes malignant glioma cell invasiveness, but also affects tumor cell proliferation. Blocking the expression of MMP-9 with antisense RNA substantially suppresses the malignant phenotype of glioma cells, and thus can be used as an effective therapeutic strategy for malignant gliomas.     

In vivo gamma imaging of the secondary tumors of transplanted human fetal striatum neural stem cells-derived primary tumor cells

This study describes gamma-imaging of the secondary tumors from the transplanted human fetal striatum neural stem cells-derived primary tumor cells in nude mice. The subcutaneous primary tumors were detected to express integrin alphavbeta3, and the corresponding cells were isolated and enriched in vitro, then transplanted to the nude mice. The technetium-99m-labeled Arg-Gly-Asp peptide, with high affinity to integrin alphavbeta3, was prepared for biodistribution and gamma-imaging. The secondary tumors were readily visualized at 1-h postinjection, and the tumor uptake of radiotracer was similar to that of positive control animals transplanted with U87MG human glioma cells. The tumor specificity of radiotracer was demonstrated by blocking experiment. We concluded that gamma-imaging is a promising approach in imaging the tumorigenesis of transplanted stem cells in vivo.     

人脑胶质瘤细胞裸鼠原位移植动物模型的建立

目的探讨人脑胶质瘤细胞裸鼠原位移植动物模型建立的技术方法。方法借助动物立体定向仪的引导,采用微注射方法将体外培养人脑胶质瘤细胞U87MG(悬浮于无血清RPMI 1640培养液中,细胞数为108/ml)接种于裸鼠(BALB/c)额叶白质区。接种后观察不同种实验鼠的生存状态,分别于接种后1 h至63 d的不同时间进行裸鼠脑肿瘤组织病理学检查和免疫组织化学分析。结果裸鼠脑内注射体外培养的人脑胶质瘤细胞U87MG的合适速率为0.05μl/min =1μl/20 min,细胞悬液体积1μl,细胞数105,注射时间20 min。按此方案注射U87MG细胞无沿针道返流,恰好在尾状核区形成近圆球形肿瘤体,成瘤率高(100%),肿瘤颅内生长稳定,组织病理学检查符合人脑胶质瘤形态特征,未见脑外转移。结论本研究的人脑胶质瘤细胞裸鼠原位移植动物模型建立方法精确可靠,重复性好。肿瘤符合人脑胶质瘤的生物学特性,该动物模型可作为研究人脑胶质瘤发生、生物学特性以及各种治疗评价的可靠动物模型。     

Using behavioral measurement to assess tumor progression and functional outcome after antiangiogenic treatment in mouse glioma models

The objective of the current study was to investigate the behavioral changes of glioma-bearing nude mice and functional outcome from treatment with a novel antiangiogenesis regimen, which is a combination of monoclonal antibodies against both vascular endothelial growth factor receptor (VEGFR)-1 (MF1) and VEGFR-2 (DC101). The reliability and responsiveness of behavioral measurement with the rearing test were first examined in nude mice bearing two kinds of gliomas--9L gliosarcoma and U87 human glioma, which have different growth rates. Using immunohistochemical staining and fluorescent imaging techniques, upregulation of the angiogenesis marker VEGF, coincident with the abnormal neovascular architecture, was confirmed in the human U87 glioma model. The behavioral measurement was then applied to assess functional outcome with the combination antibody treatment in the orthotopic mouse model of human U87 glioma. The combination antibody therapy retarded tumor progression and delayed the onset of significant behavioral deficits. Histologically, tumor necrosis and apoptosis were increased and tumor cell proliferation was decreased after treatment. In clinical trials for novel interventions, functional end points typically are included in the assessment of potential efficacy. Because certain interventions that successfully treat tumor progression in animal models might interfere with compensatory neuroplasticity, functional measurement may be valuable for improving the clinical relevance of translational brain tumor research.     

HIF-1α和hTERT shRNA双基因抑制脑胶质瘤生长的实验研究

目的 研究靶向缺氧诱导因子-1α(HIF-1α)和人端粒酶逆转录酶(hTERT)的短发夹RNA(shRNA),对裸鼠皮下人脑胶质瘤中HIF-1α、hTERT基因表达的抑制作用,及其对肿瘤增殖和细胞凋亡的影响.方法 体外培养人脑胶质瘤U251细胞;建立人脑胶质瘤裸鼠皮下接种模型;将HIF-1α shRNA、hTERT shRNA质粒转染入移植瘤中,观察肿瘤生长情况;HE染色法观察肿瘤组织的病理改变;Western blot检测HIF-1α、hTERT蛋白表达;Annexin V+PI双染流式细胞仪检测凋亡情况.结果 成功建立稳定的裸鼠U251皮下移植瘤模型;治疗5周后HIF-1α shRNA、hTERT shRNA组双基因干扰组肿瘤体积较单基因干扰组及对照组明显减小,抑瘤率为84.2%;病理结果显示双基因干扰组肿瘤生长受到抑制,微血管散在稀疏,大量肿瘤细胞坏死及凋亡;Western blot显示治疗组相应蛋白表达受抑制,双基因干扰组影响二者表达;流式细胞仪检测双基因干扰组肿瘤细胞凋亡率明显高于其他组(P＜0.01).结论 HIF-1α shRNA和hTERT shRNA均可在裸鼠移植瘤体内抑制相应蛋白表达及胶质瘤增殖生长,促进细胞凋亡,而双基因干扰作用更强.     

重构型Caspase-3对人脑胶质瘤抑瘤效应的实验研究

目的 探讨重构型Caspase-3对裸鼠皮下人脑胶质瘤生长的影响.方法 用脂质体包裹法将重构型Caspase-3基因的真核表达载体pcDNA-Rev-Caspase-3注入裸鼠皮下SHG 44人脑胶质瘤内,观察肿瘤生长情况并计算抑瘤率,结合病理组织学、电镜确定重构型Caspase-3对人脑胶质瘤的作用.结果 重构型Caspase-3在荷瘤裸鼠瘤体内获得表达,裸鼠肿瘤生长受到抑制,抑瘤率达到46.1%.结论 重构型Caspase-3能够促进肿瘤凋亡,导致肿瘤细胞死亡,抑制人脑胶质瘤生长.为进一步研究胶质瘤的基因治疗打下了基础.     

替莫唑胺缓释剂胶质瘤间质内化疗的实验研究

目的观察肿瘤间质内应用替莫唑胺缓释剂(P-TMZ)对人脑胶质瘤的抑瘤效应。方法先以MTT法测定P-TMZ对SHG-44胶质瘤细胞的抑瘤效应,加药96h后检测不同药物浓度在570nm处的OD值,计算其IC50;再将SHG-44细胞接种于NC系裸小鼠右腋皮下,待肿瘤生长至体积约100mm3时,将荷瘤鼠随机分为P-TMZ组、替莫唑胺(temozolomide,TMZ)组、卡莫斯汀(BCNU)组和不载药微球(P-0)组,然后将P-TMZ(500mg/kg)、TMZ(50mg/kg)、BCNU(40mg/kg)和P-0(500mg/kg)以DMEM培养液混悬至终体积150μl,经皮多点穿刺缓慢注入相应组肿瘤间质内,每周测量皮下肿瘤大小2次。结果P-TMZ、TMZ和BCNU对SHG-44胶质瘤细胞的体外抑瘤效果明显,三者的IC50均<10μg/ml;与P-0组比较,差异均具有统计学意义(P<0.01)。在体内抑瘤实验中,P-TMZ、BCNU、TMZ抑瘤率均明显高于P-0(P<0.01)。P-TMZ和BCNU的抑瘤效应优于TMZ组(P<0.05)。结论P-TMZ保留了TMZ的抑瘤活性,兼具高稳定性和长时程药物作用时间等药代...     

多聚凝胶介导IGF-IR反义寡核苷酸治疗体内胶质瘤的实验研究

目的探讨反义寡核苷酸阻断IGF-IR基因表达对裸鼠移植胶质瘤的抑制作用。方法首先建立胶质瘤裸鼠移植模型,随机分为4组:空白对照组、多聚凝胶组、正义核酸组和反义核酸组,反义核酸组在瘤内注射多聚凝胶包裹的反义寡核苷酸,其他每组均作相应的瘤内注射处理。利用多聚凝胶缓释反义寡核苷酸的作用,观察肿瘤的抑制情况、肿瘤病理和IGF-IR表达结果。结果反义核酸组用反义核苷酸开始治疗后的第1周、第2周和第3周,肿瘤的生长速度明显减慢,与空白对照组相比,抑制率分别为65.2%、76.38%和69.6%;而多聚凝胶组和正义核酸组肿瘤生长速度与空白对照组相比无明显差异,其抑制率在各时间点均低于10%。肿瘤的组织病理发现多聚凝胶组、正义核酸组如同空白对照组(野生型),肿瘤细胞密集分布,呈明显的恶性增殖表现,而反义核酸组肿瘤细胞稀疏,可见部分细胞呈凋亡改变,细胞染色质浓聚边缘化。在空白对照组(野生型)、多聚凝胶组和正义核酸组IGF-IR蛋白均呈高表达,而反义核酸组IGF-IR的表达明显减弱。结论IGF-IR的反义寡核苷酸对体内胶质瘤的生长具有明显的抑制作用,并能诱导部分肿瘤细胞凋亡。因此,IGF-IR可作为胶质瘤基因治疗的靶。     

Expression of antisense bcl-2 cDNA abolishes tumorigenicity and enhances chemosensitivity of human malignant glioma cells

Bcl-2 is a key antiapoptotic protein, and it confers survival advantages on many types of tumors by inhibiting apoptotic cell death. Malignant gliomas are the most common primary central nervous system tumors, but the role of bcl-2 in these tumors has not been defined. We investigated the impact of bcl-2 on malignant gliomas by suppressing its expression. Antisense human bcl-2 cDNA was transfected into human malignant glioma cells. The effects of bcl-2 protein down-regulation on glioma cell morphology, in vitro tumor growth, and tumorigenicity in nude mice, as well as chemosensitivity to cisplatin, were studied. Expression of antisense bcl-2 cDNA decreased bcl-2 protein by more than sixfold. Antisense bcl-2 stable transfectants (AS-bcl-2) showed profound morphological change and markedly retarded cell growth in vitro. Transplantation of AS-bcl-2 cells resulted in no tumor formation, whereas backbone plasmid transfectant control formed tumors in each mouse transplanted. Expression of antisense bcl-2 in glioma cells resulted in significantly increased cytotoxicity of cisplatin. In conclusion, antisense bcl-2 expression can effectively reduce glioma survival, including retarding in vitro growth, complete loss of tumorigenicity, and significantly enhanced cisplatin cytotoxicity. These results suggest that bcl-2 plays an important role in glioma malignancy and chemoresistance. Development of strategies targeted at bcl-2 has the potential to advance treatment for malignant gliomas.     

FasL基因治疗移植于裸鼠的人脑胶质母细胞瘤的实验研究

目的 :探讨FasL基因在体内诱导胶质瘤细胞凋亡和抑制增殖的作用。方法 :在裸鼠皮下种植Fas表达阳性的人脑胶质母细胞瘤细胞系TJ90 5 ,成瘤后 ,利用脂质体介导FasL基因瘤内治疗 ,在 3 9d观察期间 ,用千分尺测量肿瘤生长 ,最终取出肿瘤 ,用原位杂交 ,免疫组化鉴定FasL基因和蛋白的表达 ,应用TUNEL法检测细胞凋亡 ,Ki 67免疫组化检测细胞增殖。结果 :FasL基因瘤内注射观察 3 9d后 ,治疗组瘤体积明显小于对照组 (P <0 0 1) ,肿瘤组织细胞内FasL基因表达增加 ,凋亡细胞数增多 ,细胞增殖率降低。结论 :FasL基因对Fas表达阳性胶质瘤有治疗作用。     

建立人脑膜瘤裸鼠皮下移植模型的研究

目的探讨人脑膜瘤裸鼠皮下移植模型的建立方法。方法将手术切除的4例新鲜人脑膜瘤标本制成组织块,接种于15只裸鼠的皮下,连续喂养12周,观察各组皮下肿瘤的生长情况和组织形态特征,并进行移植瘤传代实验和染色体鉴定。结果接种的15只裸鼠中12只有皮下肿瘤生长,成瘤率80％;皮下移植瘤无明显浸润生长,由裸鼠皮下血管供血,其病理形态特征与人脑膜瘤基本一致;传代后组织学类型与细胞核型均未改变。结论裸鼠皮下移植是建立人脑膜瘤动物模型的可靠方法,可用于脑膜瘤的基础和临床研究。