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Development of targeted therapy therapeutics to sensitize triple-negative breast cancer chemosensitivity utilizing bacteriophage phi29 derived packaging RNA

  2021-07-30 11:49:00  
Background: To date, triple-negative breast cancer (TNBC) treatment options are limited because of the loss of target receptors and, as a result, are only managed with chemotherapy. What is worse is that TNBC is frequently developing resistance to chemotherapy. By using small interfering RNA (siRNA)-based therapeutics, our recent work demonstrated X-box-binding protein 1 (XBP1) was linked to human epidermal growth factor receptor 2 positive (HER2+) breast cancer development and chemoresistance. Given the instability, of-target efects, net negative charge, and hydrophobicity of siRNA in vivo utilization and clinical transformation, its use in treatment is hampered. Thus, the development of a siRNA-based drug delivery system (DDS) with ultra-stability and specifcity is necessary to address the predicament of siRNA delivery.

Results: Here, we assembled RNase resistant RNA nanoparticles (NPs) based on the 3WJ structure from Phi29 DNA packaging motor. To improved targeted therapy and sensitize TNBC to chemotherapy, the RNANPs were equipped with an epidermal growth factor receptor (EGFR) targeting aptamer and XBP1 siRNA. We found our RNA NPs could deplete XBP1 expression and suppress tumor growth after intravenous administration. Meanwhile, RNA NPs treatment could promote sensitization to chemotherapy and impede angiogenesis in vivo.

Conclusions: The results further demonstrate that our RNA NPs could serve as an efective and promising platform not only for siRNA delivery but also for chemotherapy-resistant TNBC therapy.

This work was supported by the National Natural Science Foundation of China (31800833, 21977081, 81601626 and 81703713), Zhejiang Provincial Natural Science of Foundation of China (LZ19H180001 and Y20C070010), Wenzhou Medical University and Wenzhou Institute, University of Chinese Academy of Sciences (WIBEZD2017001-03, WIUCASQD2019002 and WIUCASYJ2020001-5), Wenzhou Science and Technology Plan Project (Y20180071).

website link: https://doi.org/10.1186/s12951-020-00758-4