天津医药 ›› 2016, Vol. 44 ›› Issue (1): 33-37.doi: 10.11958/20150109

• 细胞与分子生物学 • 上一篇    下一篇

酸敏感阿霉素前药纳米粒的合成及其在治疗脑胶质瘤中的作用

刘金剑# , 张玉民# , 杨翠红, 褚丽萍, 黄帆, 高红林, 刘鉴峰△   

  1. 中国医学科学院&北京协和医学院放射医学研究所, 天津市放射医学与分子核医学重点实验室 (邮编300192)
  • 收稿日期:2015-08-13 修回日期:2015-09-11 出版日期:2016-01-15 发布日期:2016-01-15
  • 通讯作者: △通讯作者 E-mail: lewis78@163.com E-mail:lewis78@163.com
  • 作者简介: 刘金剑 (1981), 男, 助理研究员, 主要从事自组装纳米材料、 分子核医学研究
  • 基金资助:
    国家自然科学基金资助项目 (51203189, 51303213, 81171371); 天津市应用基础与前沿技术研究计划重点项目 (13JCZD? JC28100);“协和青年基金资助” 和 “中央高校基本科研业务费专项资金资助”(3332015100); 中国医学科学院放射医学研究所发展基金 (1550, 1428)

Synthesis of acid-sensitive doxorubicin prodrug nanoparticle and its application in brain glioma treatment

LIU Jinjian# , ZHANG Yumin# , YANG Cuihong, CHU Liping , HUANG Fan, GAO Honglin, LIU Jianfeng△   

  1. Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science and Peking Union Medical College, Tianjin 300192, China
  • Received:2015-08-13 Revised:2015-09-11 Published:2016-01-15 Online:2016-01-15
  • Contact: △Corresponding Author E-mail:lewis78@163.com E-mail:lewis78@163.com

摘要: 摘要: 目的 合成一类新的具有酸敏感性能的阿霉素前药纳米粒 (PEG-DOX NPs), 对其结构进行表征, 并研究其在体外抗脑胶质瘤中的作用和透过血脑屏障的效率。方法 通过席夫碱反应合成具有酸敏感的聚乙二醇-阿霉素 (PEG-DOX) 单体, 通过自组装制备 PEG-DOX NPs。利用动态光散射 (DLS) 和核磁对单体进行结构表征, 通过透射电镜 (TEM) 对纳米粒的微观形貌进行观察, 紫外检测法测定 PEG-DOX NPs 在酸性条件下的释放行为, 荧光显微镜观察脑胶质瘤细胞对 PEG-DOX NPs 的摄取行为。利用MTT 法测定 PEG-DOX NPs 与阿霉素 (DOX) 对脑胶质瘤细胞的杀伤作用。PEG-DOX NPs 修饰吐温 80 (PS-80) 获得 PS80-PEG-DOX NPs。将 9 只 BALB/c 小鼠随机均分为 Free DOX 组、 PEG-DOX NPs 组和 PS80-PEG-DOX NPs 组, 利用小动物活体成像系统比较其修饰前后脑及主要脏器内 DOX 的荧光强度。结果 PEG-DOX 能够自组装成直径 100 nm 左右的纳米粒; 在酸性条件下 PEG-DOX NPs 能够快速释放 DOX, 肿瘤细胞对 PEG-DOX NPs 的摄取虽然比 DOX 慢, 但蓄积时间更长; PEG-DOX NPs 和 Free DOX 对 C6 细胞的增殖抑制均呈现浓度依赖性, PEG-DOX NPs 组细胞增殖抑制率在各个浓度下均低于 Free DOX 组。 PS-80 修饰后, PS80-PEG-DOX NPs 透过血脑屏障的效率显著高于 DOX 和 PEG-DOX NPs 组。结论 PEG-DOX NPs 具有良好的体外抗肿瘤作用, 修饰后可高效透过血脑屏障, 使其体内治疗脑胶质瘤成为可能。

关键词: 阿霉素前药, 纳米粒, 脑胶质瘤, 酸敏感, 血脑屏障

Abstract: Abstract: Objective To synthesize a new kind of acid-sensitive doxorubicin prodrug nanoparticles and to evaluate its anti-brain glioma effect and efficiency through blood-brain barrier (BBB). Methods The prodrug acid-sensitive poly⁃ ethylene glycol (PEG) - doxorubicin (PEG-DOX) copolymer was synthesized by Schiff base reaction, and PEG-DOX pro⁃ drug nanoparticles (PEG-DOX NPs) were prepared by self-assembling. The character of PEG-DOX copolymer was detected by dynamic light scattering (DLS) instrument and 1 H NMR. The morphology of PEG-DOX NPs was observed by transmission electron microscopy (TEM). The character of drug release was detected by UV mothed. The cellular uptake efficiency of glio⁃ ma cells to PEG-DOX NPs was observed by inverted fluorescence microscope. The anti-brain glioma effects of PEG-DOX NPs and Free DOX were studied by MTT mothed. PS80-PEG-DOX NPs were gained by the modification of PEG-DOX NPs with Tween 80. Nine BALB/c mice were separated into Free DOX, PEG-DOX NPs and PS80-PEG-DOX NPs groups by ran⁃ dom drawing lots. The mean fluorescence intensity of brain and main organs were observed by in vivo imaging system. Re⁃ sults The copolymer of PEG-DOX can self-assemble into nanoparticles with the diameter of 100 nm. PEG-DOX NPs can quickly release DOX in acid environment. Although PEG-DOX NPs had slow cancer cell uptake than Free DOX, it had lon⁃ger accumulation. MTT results showed that PEG-DOX NPs had concentration dependent anti-brain glioma effect. Indepen⁃ dent samples t-test indicated that the efficiency through BBB was significantly higher in PS80-PEG-DOX NPs group than that of Free DOX group and PEG-DOX NPs group. Conclusion PEG-DOX NPs show well anti-brain glioma effect in vi⁃ tro, and can across BBB with high efficiency after modification, which make it possible for a potential therapeutic prodrug for brain glioma.

Key words: blood-brain barrier, doxorubicin prodrug, nanoparticle, brain glioma, acid-sensitive