A targeted nanoplatform co-delivery of pooled siRNA and doxorubicin for reversing of multidrug resistance in breast cancer

Multi-drug resistance (MDR) has become the largest obstacle to the success of cancer patients receiving traditional chemotherapeutics or novel targeted drugs. Here, we developed a targeted nanoplatform based on biodegradable boronic acid modified epsilon-polylysine to co-deliver P-gp siRNA, Bcl-2 siRNA, and doxorubicin for overcoming the challenge. The targeted nanoplatform showed a robust suppressing efficiency for the invasion, proliferation, and colony formation of adriamycin (ADR) resistant breast cancer cell line (MCF-7/ADR) cells in vitro. The ATP responsiveness of the nanoplatform was also proved in the research. In the in vivo antitumor experiment, the targeted nanoplatform showed a significant inhibition of tumor growth with good biocompatibility. The goal of this study is to develop a novel and facile strategy to prepare a highly efficient and safe gene and drug delivery system for MDR breast cancer based on biocompatible epsilon-polylysine polymers.