Abstract
Conventional cancer combination therapy usually involves systemic delivery of anticancer drugs which may lead to the destruction of normal cells and physiological toxicity due to the lack of targeting ability and toxicity of drug carriers. In the present study, a triple combination nanosystem of gene therapy, chemotherapy and phototherapy delivered by multifunctional RNA nanohydrogels (RNA NHs) was established. By taking the advantages of DNA nanotechnology and rolling circle transcription (RCT), three lung cancer inhibitor microRNA (let-7a, microRNA 34a, microRNA 145) hairpins were integrated in one RNA NH nanoparticle, leading to the simultaneous silencing of three targeted mRNAs. Meanwhile, RNA NH carried doxorubicin (DOX, a chemotherapy drug) as well as 5,10,15,20-tetrakis (1-methylpyridinium-4-yl) porphyrin (TMPyP4, a photosensitizer) and delivered these drugs to cancer cells. It was demonstrated that lung cancer inhibitor microRNAs integrated in RNA NHs, DOX and TMPyP4 could play a synergistic anti-cancer role in multi-drug resistance cancer cells. Under the action of aptamer sequence S6 that was modified with cholesterol, the resulting RNA NHs were condensed to feasible size without the assistance of polyelectrolyte condensation reagents and showed cancer-specific cellular targeting. Subsequently, thousands of copies of miRNA together with chemotherapy drug as well as photosensitizer were delivered to cancer cells specifically, and an ideal synergistic treatment effect was achieved in vivo, thus playing a combined role of gene therapy, chemotherapy and phototherapy. Through this study, it can be concluded that the triple combination therapy nanosystem can overcome the multidrug resistance caused by the malfunction of genes in chemotherapy and shows a great potential in the field of multifunctional synergistic cancer treatment.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21876074, 21605071, 21775063), the Shandong Provincial Key Research and Development Program (2017CXZC1206, GG201809250462), the Shandong Provincial Natural Science Foundation Major Basic Research Project (ZR2018ZC0231) and Taishan Scholars Program of Shandong Province (tsqn201812101).
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Li, J., Yuan, D., Zheng, X. et al. A triple-combination nanotechnology platform based on multifunctional RNA hydrogel for lung cancer therapy. Sci. China Chem. 63, 546–553 (2020). https://doi.org/10.1007/s11426-019-9673-4
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DOI: https://doi.org/10.1007/s11426-019-9673-4