共查询到19条相似文献,搜索用时 171 毫秒
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目的:观察重组腺病毒TRAIL基因制剂联合抗EGFR靶向药物对H460肺癌细胞株及裸鼠移植瘤增殖的影响。方法:重组腺病毒TRAIL基因治疗制剂分别与EGFR信号通路靶向治疗药物Iressa、Tarceva、以及C225联合应用于H460肺腺癌细胞株,采用MTT法以及流式细胞仪检测不同用药方案的抗肿瘤作用;在裸鼠H460肺癌模型中验证重组腺病毒TRAIL制剂与C225的协同抗肿瘤作用。结果:在体外实验中发现Iressa和Tarceva可以增加重组腺病毒TRAIL基因制剂对H460肺癌细胞的抗肿瘤作用(P<0.05);重组腺病毒TRAIL基因制剂在体外实验中与C225并不存在协同效应(P>0.05),但在裸鼠H460肺癌模型中重组腺病毒TRAIL基因制剂与C225有明显的协同抗肿瘤作用(P<0.05)。结论:本研究初步探讨了基因治疗与靶向治疗的联合抗肿瘤作用,实验发现EGFR信号通路上的靶向治疗药物包括小分子酪氨酸激酶抑制剂以及EGFR单克隆抗体均可以增加重组腺病毒TRAIL基因制剂抗肺癌作用。 相似文献
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T. Wu X. Ding B. Su A. K. Soodeen-Lalloo L. Zhang J.-Y. Shi 《Clinical & translational oncology》2018,20(5):599-606
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Using RGD10–NGR9 dual-targeting superparamagnetic iron oxide nanoparticles to evaluate their potential value in tumor angiogenesis magnetic resonance imaging (MRI) and the biodistribution in vitro and in vivo.Materials and methods
Dual-targeting RGD10–NGR9 ultrasmall superparamagnetic iron oxide (USPIO) nanoparticles were designed and synthesized in our previous study. In vitro, prussian blue staining and phenanthroline colorimetry were conducted to evaluate binding affinity and adsorption of dual-targeting USPIO nanoparticles to αvβ3-integrin/APN positive cells. In vivo, a xenograft mouse tumor model was used to evaluate the potential of the dual-targeting nanoparticles as an MRI contrast agent. After intravenous injection, the contrast-to-noise ratio (CNR) values of MR images obtained were calculated at predetermined time-points. The iron level was detected to access the biodistribution and plasma half-time.Results
In vitro, dual-targeting USPIO nanoparticles bound to proliferating human umbilical vein endothelia cells with high specificity. In vivo, contrast MRI of xenograft mice using dual-targeting nanoparticles demonstrated a significant decrease in signal intensity and a greater increase in CNR than standard MRI and facilitated the imaging of tumor angiogenesis in T2*WI. In terms of biodistribution, dual-targeting USPIO nanoparticles increased to 1.83 times in tumor lesions as compared to the control. And the plasma half-time was about 6.2 h.Conclusion
A novel RGD10–NGR9 dual-targeting USPIO has a great potential value as a contrast agent for the identification of tumor angiogenesis on MRI, according to the high specific affinity in vitro and in vivo.12.
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目的:探讨双向调控时钟基因Bmal1(brain and muscle arnt-like1)对鼻咽癌CNE1裸鼠移植瘤生长的影响及与放疗敏感性的关系。方法:采用慢病毒感染方法,构建Bmal1基因CNE1OE(过表达组)、CNE1OENC(过表达对照组)、CNE1sh3(低表达组)、CNE1shNC(低表达对照组)4株细胞,Western blot验证各组细胞Bmal1蛋白表达情况;4株细胞分别皮下注射相应的4组裸鼠,移植瘤生长后测量其体积;给予6-MeV电子线15 Gy照射裸鼠移植瘤,观察放疗后各组移植瘤体积变化情况。剥离移植瘤,RTPCR及Western blot分别检测Bmal1、P53、P21 mRNA及蛋白表达情况。结果:Western blot结果提示,与各自对照组对比,CNE1OE组Bmal1蛋白过表达,CNE1sh3组Bmal1蛋白低表达,表明细胞转染成功。成功构建裸鼠移植瘤模型,CNE1OE组裸鼠移植瘤体积明显小于CNE1OENC组,CNE1sh3组体积明显大于CNE1shNC组(P<0.05)。放疗后,CNE1OE、CNE1OENC、CNE1shNC组裸鼠移植瘤体积均缩小(P<0.05),其中CNE1OE组缩小最明显。CNE1sh3组放疗前后自身体积变化差异无统计学意义。Bmal1基因、P53及P21的mRNA及蛋白相对表达量在CNE1OE组明显高于CNE1OENC组(P<0.05),CNE1sh3组则明显低于CNE1shNC组(P<0.05)。结论:Bmal1基因过表达能抑制鼻咽癌CNE1裸鼠移植瘤生长,增强其放疗敏感性,可能与P53、P21蛋白上调相关;敲低则促进移植瘤生长,导致其辐射抗拒,可能与P53、P21蛋白下调相关。 相似文献
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观察由RNAi诱导的EC9706核干细胞因子(NS)基因沉默对裸鼠移植瘤生长的抑制作用。方法:BALB/c裸鼠15只,分为3组,siRNA干预组皮下注入pRNAT-U6.1-siNS2转染的EC9706细胞,无关siRNA对照组皮下注入pRNAT-U6.1-siC转染的EC9706细胞,空白对照组皮下注入正常EC9706细胞,接种5周分别测定各组裸鼠移植瘤体积,并应用RT-PCR技术检测裸鼠移植瘤组织中NS mRNA的表达。结果:无关siRNA对照组及空白对照组于第4天在接种部位出现肉眼可见的肿块,siRNA干预组于第6天在接种部位发现肉眼可见肿块。第5周各组裸鼠成瘤率均为100%。空白对照组、无关siRNA对照组和siRNA干预组瘤体大小分别为(1 806.40±77.75) mm3、(1 702.20±88.60) mm3和(847.00±82.25) mm3,3组相比差异有统计学意义(P<0.05)。空白对照组、无关siRNA对照组和siRNA干预组移植瘤组织中NS mRNA的表达量分别为0.681±0.033、0.685±0.034和0.497±0.056,3组相比差异有统计学意义(P<0.05)。结论:沉默EC9706细胞的NS基因可抑制裸鼠移植瘤生长,降低裸鼠体内NS mRNA的表达。沉默NS基因有可能成为治疗食管癌的新策略。 相似文献
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目的:构建肿瘤靶向的核磁共振成像(magnetic resonance imaging, MRI)阴性造影剂纳米粒,并初步探讨其在肿瘤MRI中的应用.方法:化学共沉淀一步法制备超小型超顺磁性氧化铁(ultrasmall superparamagnetic iron oxide, USPIO)纳米粒.采用化学交联法将含有精氨酸-甘氨酸-天冬氨酸(Arg-Gly-Asp, RGD)序列的环形短肽(cyclic RGD, cRGD)与USPIO共价结合,制备具有整合素α靶向作用的超顺磁性造影剂,并对其进行理化性质的检测.采用普鲁士兰染色法检测cRGD-USPIO和USPIO与人肺腺癌A549细胞及人脐静脉内皮细胞(human umbilical vein endothelial cells, HUVECs)的特异性结合能力.建立A549裸鼠移植瘤模型,尾静脉注射USPIO和cRGD-USPIO,行MRI检测,评价cRGD-USPIO对肿瘤MRI信号增强的作用.结果:成功制备获得cRGD-USPIO纳米粒,其核心纳米粒径为5~10 nm,平均粒径为(43.97±10.10)nm,比饱和磁化强度为59.94 A·m~2·kg~(-1).细胞结合实验结果提示,与USPIO组比较,cRGD-USPIO组阳性染色明显增强.动物体内MRI诊断结果显示,与USPIO组比较,cRGD-USPIO组肿瘤信号明显降低(P<0.01).结论:构建的靶向性超顺磁性氧化铁纳米粒可能成为一种新型的、具有肿瘤早期诊断特异性的MRI阴性造影剂. 相似文献
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Hitoshi Maeda Tohru Uozumi Kaoru Kurisu Takashi Matsuoka Keiichi Kawamoto Katsuzo Kiya Hidenori Ogasawara Kazuhiko Sugiyama Takashi Mikami Syuji Monden Kunyu Harada Yasuhiro Matsuda 《Journal of neuro-oncology》1994,21(3):203-213
Summary The antitumor effects of TNF and G-CSF on a xenograft line of human medulloblastoma were examined. (Method): 1) A human medulloblastoma xenograft line was transplanted into nude mice. Tumor bearing nude mice were divided into the following eight groups: untreated controls (C); those receiving a subcutaneous injection of G-CSF for one week (G1); for four weeks (G2); those receiving an intratumoral injection of TNF for four weeks (Tit); an intravenous injection of TNF (Tiv); those receiving a combination of G1 and Tit (G1 + Tit); a combination of G2 and Tit (G2 + Tit); and a combination of G2 and Tiv (G2 + Tiv). The relative tumor weight in each group was calculated and any antitumor effects were examined by calculating a tumor growth inhibition ratio. 2) Tumor bearing nude mice were divided into the following two groups: those receiving a subcutaneous injection of G-CSF and an intravenous injection of TNF (G + T); and only an intravenous injection of TNF (T). We evaluated the pathological findings from the tumors at 0 h, 0.5 h, 1 h, 3 h, 6 h, 12 h, 24 h and 48 h after the TNF injection. Routine H.E. staining and immunostaining using antigranulocyte and antimacrophage antibodies were performed. (Results): 1) The tumor growth inhibition ratio was 0.112, 0.190, 0.287, 0.451, 0.347, 0.635, and 0.622 at G1, G2, Tit, Tiv, G1 + Tit, G2 + Tit, G2 + Tiv group. A combined antitumor effect was clearly seen in the G2 + Tit and the G2 + Tiv groups. 2) The tumor was fragmented by the infiltration of many inflammatory cells 24 hours after TNF injection. Many more macrophages were observed in the tumors of G + T mice than in the T mice. Granulocytes were observed only in the tumors of the G + T mice. 相似文献
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人绒癌裸鼠皮下移植瘤模型的放射免疫显像 总被引:3,自引:0,他引:3
目的 探讨放射免疫显像对人绒癌裸鼠皮下移植瘤的显像效果。方法 应用^131I标记的小鼠抗hCG单克隆抗体,对人绒癌裸鼠皮下移植瘤模型进行放射免疫显像,以正常小鼠IgG作为对照,观察放射免疫显像效果,并测定不组织中的放射性活度,计算肿瘤/非肿瘤放射活性比(T/NT比值)。结果 在注入标记抗体后24小时,移植瘤部位即可见放射性浓聚,并随时间的推移而浓聚增强,72-96小时后肿瘤可以清晰显像,可显像的最 相似文献
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目的:比较右美托咪定滴鼻联合舒芬太尼和单独使用水合氯醛在儿童肿瘤放射治疗过程中的疗效。方法:选取2018年11月至2019年9月深圳市人民医院行肿瘤放疗的48例患儿作为研究对象,随机分组为接受右美托咪定滴鼻联合舒芬太尼组(DS组)和口服水合氯醛组(C组)。观察比较两组镇静起效时间、苏醒时间和放射治疗时间,以及镇静前后平均动脉血压(MAP)、心率(HR)和血氧饱和度(SpO2)的变化情况,并统计两组不良反应发生情况。结果:研究纳入48例患儿,其中DS组24例和C组23例纳入最终分析。与C组相比,DS组患儿恢复时间更短,MAP、HR和不良反应发生率更低。两组患儿用药起效时间、治疗时间的差异无统计学意义(P>0.05)。结论:右美托咪定滴鼻联合舒芬太尼能安全地应用于儿童肿瘤放射治疗并缩短恢复时间。 相似文献