排序方式: 共有33条查询结果,搜索用时 15 毫秒
1.
Objective: To investigate the immunotherapy efficacy of fusion cells (dendritic-C6anti-TGF-β1 cells) in the treatment of intraeranial gliomas. Methods: Dendritic cells were isolated from rat bone-marrow precursors stimulated in vitro with granuloeyte-macrophage colony-stimulating factor (GM-CSF) and Interleukin-4 (IL-4). C6anti-TGF-β1 cells originally from C6 cell line of a rat glioblastoma were transfected with plasmid of TGF-β1 anti-sense gene. Fusions of dendritic cells and C6anti-TGF-β1 cells were prepared by polyethylene glycol (PEG). The DC/C6anti-TGF-β1 fusion cells were observed and confirmed by fight microscopy and scanning electron microscopy. Experimental rats were divided into three groups at random: C6 cells (Ⅰ), dendritic-C6anti-TGF-β1 fusion cells and C6 cells (Ⅱ) and IMDM medium only (Ⅲ). The cells were injected into right parietal lobe region of the rat with stereotaxic technique. Histology, tumor necrosis and survival time were evaluated. Results: Compared with the rats that received C6 cells (survival median time was less than 20 days, tumor region was seen in all fields of observed), the rats injected with dendritic-C6anti-TGF-β1 fusion cells and C6 cells got a more prolonged life span (more than 59 days), as well as less tumor region (5.01%-6.2%). There was no tumor necrosis, but some glias were seen in surroundings. All rats were survived and no necrosis was observed in negative control group. Statistical analysis showed that group Ⅱ had significant difference compared with group Ⅰ. Conclusions: Dendritic-C6anti-TGF-β1 fusion cells could prolong the life span of rats, providing a strategy to achieve an antitumor response against tumors in the central nervous system. 相似文献
2.
目的 探讨病毒蛋白VP_(22)在胞嘧啶脱氨酶(cytosine deaminase,CD)基因工程化神经干细胞治疗大鼠C6胶质瘤中的作用.方法 质粒pAdTrack-CMV-CD中PCR获取CD片段,克隆到慢病毒(lentivirus)质粒pHIV-EGFP和pHIV-VP_(22)-EGFP载体上,获得重组质粒pHIV-CD-EGFP和pHIV-VP_(22)-CD-EGFP,采用酶切和PCR技术进行鉴定.病毒包装采用三质粒系统共同转染293T细胞.CD基因的表达采用逆转录-聚合酶链式反应(RT-PCR)方法鉴定.Lentivirus-EGFP、lentivirus-CD-EGFP、lentivirus-VP_(22)-EGFP和lentivirus-VP_(22)-CD-EGFP四种慢病毒感染经体外原代培养、扩增的SD大鼠胎脑神经干细胞(Nerual stem cells,NSCs),体外与C6细胞按1:1比例共培养,并加入终浓度100 mg/L的5-氟胞嘧啶(5-FC)培养3 d后,MTT比色法测定细胞存活率.结果 酶切和PCR证实,重组的慢病毒中含有CD基因.慢病毒lentivirus-EGFP、lentivirus-CD-EGFP、lentivirus-VP_(22)-EGFP和lentivirus-VP_(22)-CD-EGFP分别感染NSCs后与C6细胞共培养,在5-FC作用下,其细胞存活率分别为(95.57±4.83)%,(49.96±7.19)%,(94.25±4.32)%和(28.06±6.26)%.统计学处理,转染lentivirus-CD-EGFP和lentivirus-VP_(22)-CD-EGFP组的细胞存活率明显低于其相应对照组lentivirus-EGFP和lentivirus-VP_(22)-EGFP(P<0.01);其中转染lentivirus-VP_(22)-EGFP组的细胞存活率又明显低于lentivirus-EGFP组(P<0.01).结论 VP_(22)能够在体外增强CD基因修饰的NSCs抗C6胶质瘤疗效. 相似文献
3.
目的 研究转化生长因子β(TGF-β)信号传导通路中TGF-β2/Smad2在人脑胶质瘤组织中的表达和意义.方法 收集人脑胶质瘤组织样本59例,免疫组织化学法检测TGF-β2、Smad2、磷酸化Smad2(P-Smad2)及Ki-67蛋白在其中表达情况,反转录聚合酶链反应(RT-PCR)检测其中Smad2 mRNA的表达.结果 TGF-β2、Smad2、P-Smad2及Ki67蛋白与人脑胶质瘤病理级别呈正相关(P<0.01),各级别均数比较差异均有统计学意义(P<0.05);TGF-β2、Smad2、P-Smad2蛋白表达之间亦呈正相关(P<0.01);TGF-β2、Smad2及P-Smad2蛋白表达均与增殖指标Ki-67蛋白表达呈正相关(P<0.01).Smad2 mRNA表达与Smad2和P-Smad2蛋白表达呈正相关(P<0.05).结论 TGF-β2/Smad2蛋白表达随肿瘤病理级别增高表达增强,与胶质瘤的恶性进展有关. 相似文献
4.
目的观察低氧条件下TRIM33基因表达的变化情况及对胶质瘤U251细胞生物学功能的影响。方法将U251细胞分别在低氧及常氧条件下培养不同时间,采用实时荧光定量PCR及Western blot检测TRIM33的表达变化情况。通过构建TRIM33过表达慢病毒转染U251细胞,采用Western blot检测转染后U251细胞TRIM33的表达,低氧条件下利用CCK-8检测细胞增殖,Transwell检测细胞迁移及侵袭,Western blot检测上皮-间质转化(EMT)相关蛋白的表达情况。结果(1)与常氧条件培养的U251细胞相比,低氧条件下U251细胞中的TRIM33表达发生下调(P〈0.001)。(2)与空白对照组相比,TRIM33组的TRIM33相对表达水平明显升高(P〈0.001)。(3)CCK-8实验表明,与空白对照组相比,TRIM33组的细胞增殖活力差异无统计学意义(P〉0.05)。(4)Transwell实验结果显示,TRIM33组的迁移及侵袭能力较空白对照组明显降低(均P〈0.05)。(5)Western blot结果显示,与空白对照组相比,EMT相关蛋白即波形蛋白、N-钙黏素表达水平均明显降低(均P〈0.01),E-钙黏素表达水平显著升高(P〈0.001)。结论在低氧条件下人脑胶质瘤U251细胞TRIM33表达发生下调,过表达TRIM33可以显著抑制低氧环境对U251细胞迁移、侵袭的影响,其可能是通过影响EMT实现的。TRIM33可作为拮抗低氧微环境的潜在基因治疗靶点。 相似文献
5.
Objective: To establish a stable C6/EGFP glioma cell transfected with the human immunodeficiency virus line for studies on glioma. Methods: The C6 glioma cell line was type I (HIV-1) based lentivirus vector containing two enhancer-promoters CMV and EF1α. Enhanced green fluorescent protein (EGFP)-positive C6 cells were sorted out by fluorescence-activated cell sort. Expression of EGFP was observed by fluorescent microscopy. EGFP gene in C6 genome was assessed by Polymerase chain reaction (PCR) and DNA sequencing. Original and transfected cells were compared biologically and cytomorphologically. Results: Lentivirus vector transfection produced up to 40% EGFP-positive cells. After fluorescence-activated cell sort selection, a pure cell line C6/EGFP was established. PCR and DNA sequencing revealed integration of EGFP gene in C6 cell genome. Analysis of cell characteristics revealed no difference between transfected and original cells. Conclusion: A C6/EGFP cell line expressing EGFP as a marker is established, in which the EGFP gene is integrated into the genome. This cell line can be served as a promising tool for further basic research and gene therapy studies. 相似文献
6.
在小动物失血性休克模型中,反复取血检测其生化指标的频度受到明显的限制。作者利用透析原理,测定血液透析液中葡萄糖(glucose,GS)和乳酸(lactate,LA)浓度,再除以回收率换算血中该物质浓度,旨在寻找一种在小动物实验中,不经采血也能连续准确... 相似文献
7.
8.
熊胆冻干粉针剂对失血性休克大鼠肠系膜微循环的影响 总被引:2,自引:0,他引:2
目的 :观察熊胆注射液对失血性休克大鼠平均动脉血压 (MABp)和存活时间的影响及其对失血性休克大鼠肠系膜微循环的作用。方法 :将Wistar系失血休克大鼠随机分 2组 :实验组 (BBI组 )静脉滴注 18mg/kg熊胆注射液 36ml/kg ;对照组 (NS组 )给予等容量的生理盐水。分别记录放血前、放血 6 0min、给药抢救 30min、 6 0min时MABp和各微循环指标的动态变化以及存活时间。结果 :(1)休克时各组MABp显著降低 ,BBI组给药后血压回升作用显著 ,与NS组比较给药抢救 30min、 6 0min时分别为P <0 .0 5、P <0 .0 1;存活时间BBI组明显延长 ,与NS组比较P <0 .0 1)。 (2 )在休克时二组肠系膜微血管血液速度均显著变慢 ,从放血前的线流变为粒流、泥流 ,红细胞聚集甚至停流。微血管口径均显著变细 ;微血管活动数均显著减少 ,而给药后微血管血流速度加快 ,微血管流态改善 ,变为粒线流及线粒流 ;微血管口径舒张 ;微血管活动数增加 ,BBI组与NS组比较均有显著性差异 (P <0 .0 5 )。结论 :18mg/kg熊胆注射液对失血性休克大鼠有明显的回升血压作用并延长存活时间 ;有舒张肠系膜微血管 ,改善微循环 ,减轻组织细胞缺血缺氧状态的作用。 相似文献
9.
目的研究脑胶质瘤组织不同部位O6-甲基鸟嘌呤-DNA甲基转移酶(MGMT)启动区甲基化状态及其表达的差异性。方法在54例脑胶质瘤组织的中心和周边部位分别获取标本,共获得92份标本,采用巢式甲基化特异性PCR(MSP)进行MGMT启动区甲基化状态的检测,同时采用免疫组织化学方法进行MGMT蛋白表达的检测。结果 38例胶质瘤中获得了肿瘤两个不同部位MG-MT启动区甲基化的状态,其中24例胶质瘤MGMT启动区甲基化的状态是一致的,占总数的63.2%(24/38)。在29例胶质瘤患者中获得了肿瘤两个不同部位MGMT蛋白表达的情况,其中10例胶质瘤MGMT蛋白表达是一致的,占总数的34.5%(10/29)。两总体一致性概率间差值的95%置信区间为(5.6%和51.8%),两者的差异有统计学意义。巢式MSP和免疫组化都获得检测结果的标本有77份,在61份MGMT启动区甲基化标本中,25份MGMT蛋白表达阴性,14份蛋白表达可疑阳性,18份蛋白表达阳性,4份蛋白表达强阳性。在16份MGMT启动区非甲基化标本中,2份MGMT蛋白表达阴性,2份蛋白表达可疑阳性,9份蛋白表达阳性,3份蛋白表达强阳性,MGMT启动区甲基化状态与蛋白表达呈负相关(r=-0.318,P=0.005)。结论脑胶质瘤MGMT蛋白表达在同一肿瘤的不同部位存在明显的异质性。虽然脑胶质瘤MGMT启动区甲基化的状态在同一肿瘤的不同部位存在一定的异质性,但是大多数脑胶质瘤MGMT启动区甲基化的状态在同一肿瘤的不同部位是一致的。脑胶质瘤MGMT启动区甲基化状态的一致性优于蛋白表达的一致性。脑胶质瘤MGMT启动区甲基化,MGMT蛋白表达较少,MGMT启动区非甲基化,MGMT蛋白表达较多。 相似文献
10.