Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (8): 1721.doi: 10.7503/cjcu20200283

• Article • Previous Articles     Next Articles

Platinum(Ⅳ) Prodrug-grafted Phosphorothioate DNA and Its Self-assembled Nanostructure for Targeted Drug Delivery

REN Yushuang1, GUO Yuanyuan1, LIU Xueyi1, SONG Jie2, ZHANG Chuan1   

  1. 1. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;
    2. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2020-05-25 Online:2020-08-10 Published:2020-06-11
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21661162001, 21673139, 51973112).

Abstract: cis-Platin drugs play a vital role in the clinical treatment of various cancers. However, its poor water solubility, non-targeting capability and severe side effects result in limited antitumor efficacy and greatly impede its clinic practices. To address these challenges, we successfully graft a multitude of Pt(Ⅳ) prodrugs on a diblock DNA that consists of a regular phosphodiester DNA segment with MUC-1 aptamer sequence and a phosphorothioate(PS) ploy T segment. After being modified with iodoacetate moiety, the prodrug can efficiently react with PS groups and grafted onto the backbone of PS segment, resulting in the formation of an MUC-1/PODNA-b-(PSDNA-g-Pt) conjugate. Owing to its amphiphilic feature, the obtained DNA-drug conjugate(DDC) could further self-assembled into spherical nucleic acid like nanostructure(MUC-1/Pt-SNAs) to serve as a new drug delivery system. With the presence of MUC-1 aptamer on particle surface, MUC-1/Pt-SNAs can actively target the tumor cells overexpressed MUC-1 proteins and internalize into cells with high efficiency. Together with a high drug loading ratio(39.6%) achieved by simple and convenient conjugation method, the obtained DNA-based targeted delivery system shows substantial antitumor effect and low side effects both in vitro and in vivo.

Key words: Platinum prodrug, Phosphorothioate DNA, Targeted drug delivery, Spherical nucleic acid, MUC-1 aptamer

CLC Number: 

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