http://jcps.bjmu.edu.cn

中国药学(英文版) ›› 2016, Vol. 25 ›› Issue (12): 859-868.DOI: 10.5246/jcps.2016.12.096

• 【研究论文】 •    下一篇

利用共聚焦显微镜研究siRNA/CLDs复合物的胞内分布

刁怡萍, 孙晶, 杨梦依, 徐波, 张礼和, 杨振军*   

  1. 北京大学医学部 药学院 天然药物及仿生药物国家重点实验室, 北京 100191
  • 收稿日期:2016-05-13 修回日期:2016-06-27 出版日期:2016-12-21 发布日期:2016-07-14
  • 通讯作者: Tel.: +86­010­82802503, E-mail: yangzj@bjmu. edu.cn
  • 基金资助:
    Ministry of Science and Technology of China (Grant No. 2012AA022501, 2012CB720604), and the National Natural Science Foundation of China (Grant No. 20932001, 81302626).

Evaluation of the intracellular trafficking of siRNAs in A375 cells by confocal laser scanning microscopy

Yiping Diao, Jing Sun, Mengyi Yang, Bo Xu, Lihe Zhang, Zhenjun Yang*   

  1. State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing 100191, China
  • Received:2016-05-13 Revised:2016-06-27 Online:2016-12-21 Published:2016-07-14
  • Contact: Tel.: +86­010­82802503, E-mail: yangzj@bjmu. edu.cn
  • Supported by:
    Ministry of Science and Technology of China (Grant No. 2012AA022501, 2012CB720604), and the National Natural Science Foundation of China (Grant No. 20932001, 81302626).

摘要:

研究siRNA在胞内的运输过程有助于阐明在细胞质基质中的动力学性质及过程。本文报道了激光共聚焦扫描显微镜技术用于研究siRNA及其肽缀合物与胱氨酸骨架阳离子脂质体递送系统(siRNA/CLD)的胞内分布过程。发现siRNA在胞质内分布动力学与3-单肽-siRNA缀合物/CLD递送系统的入胞途径紧密相关, 其中具有较好抗肿瘤活性的3-pAs-siRNA/CLD, 具有较快的细胞摄取及溶媒体逃逸过程, 并能在A375细胞中潴留较长的时间。该方法高效、可定量并可视化, 不仅能够测定siRNA胞内的浓度, 也能够定量分析其与细胞亚结构的共定位关系, 进一可系统研究siRNA及其缀合物在胞质内的动力学分布过程。

关键词: siRNA/CLD复合物, 溶酶体逃逸, 胞质分布, 激光共聚焦扫描显微镜

Abstract:

Investigation intracellular trafficking of siRNAs following their delivery to cells is of great interest to elucidate dynamics of siRNA in cytoplasm. In this study, we present a novel confocal laser scanning microscopy (CLSM) method to evaluate a novel delivery system of 3′-peptide-siRNA therapeutic, which was named 3′-pAs-siRNA/CLD. This method could not only calculate the content of the intracellular 3-peptide-siRNA, but also quantify its co-localization with cellular substructure. We observed that 3′-pAs-siRNA/CLD, which provided the better antitumor capability, also had a better cell uptake, endosome escape and a longer retention time in A375. This novel strategy was proved to be efficient, quantified and visualized, thus making the dynamics research of siRNA in cytoplasm clear and simplified.

Key words: siRNA/CLD complex, Endosomal escape, Cytoplasmic distribution, Confocal laser scanning microscopy

中图分类号: 

Supporting: