基础医学与临床 ›› 2014, Vol. 34 ›› Issue (5): 644-647.

• 研究论文 • 上一篇    下一篇

核酸适配体修饰的铁纳米粒对HER2阳性乳腺癌的靶向热疗效应

李凤武1,胡燕2,段金虹2,许海燕1,杨先达2   

  1. 1. 中国医学科学院 基础医学研究所
    2. 中国医学科学院基础医学研究所
  • 收稿日期:2013-12-31 修回日期:2014-03-13 出版日期:2014-05-05 发布日期:2014-04-28
  • 通讯作者: 杨先达 E-mail:ayangmd@gmail.com
  • 基金资助:
    科技部重大科学计划

Enhancement of thermal damage to HER2-positive breast cancer cells by aptamer-guided magnetic nanoparticles

  • Received:2013-12-31 Revised:2014-03-13 Online:2014-05-05 Published:2014-04-28
  • Contact: Xian-da YANG E-mail:ayangmd@gmail.com

摘要: 目的 研发能提高HER2阳性乳腺癌热疗效应的核酸适配体-铁纳米粒子复合体(AptNPs),探索肿瘤靶向治疗的全新途径。方法 利用生物素和链霉亲和素的结合反应构建AptNPs,用动态光散射粒径仪表征其尺寸分布,用流式细胞仪和相差显微镜检测AptNPs的靶向结合能力,MTS法测其对磁场下抗肿瘤热疗效果的影响。结果 通过生物素-亲和素反应构建了AptNPs,其平均直径为333.7 nm,对HER2阳性细胞有较强的结合,对HER2阴性细胞没有结合。此外,AptNPs可显著提升对HER2阳性细胞的热疗杀伤率(p<0.05),但对 HER2阴性细胞的热疗后杀伤率影响较小。结论 AptNPs能靶向性地提升针对HER2阳性肿瘤细胞的热疗效率,在研发新型肿瘤靶向热疗方面具有潜在应用价值。

关键词: 关键词:核酸适配体, 热疗, HER2阳性, 乳腺癌

Abstract: Objective To develop aptamer-modified nanoparticles (AptNPs) for targeted enhancement of thermal damage to HER2-positive breast cancer cells Methods HER2 aptamer was connected to NPs via biotin-streptavidin reaction. AptNPs were characterized by Dynamic Light Scattering (DLS). The binding feature of the aptamer was evaluated by flow cytometry, and the affinity of AptNPs to target cells by phase-contrast microscopy. Thermal damage under alternative magnetic field was measured by MTS assay. Results The average size of AptNPs was 333.7 nm. AptNPs exhibited strong binding to the HER2-positive but not the HER2-negative cells. Importantly, AptNPs enhanced the thermal damage to the HER2-positive tumor cells, but not that to the HER2-negative cells. Conclusions Aptamer-guided iron particles may have potential utility in development of novel HER2-targeted thermal therapies.

Key words: Key Words: aptamers, thermal therapy, HER2-targeted, breast cancer

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