Abstract
A sticky-flare gold nanoparticle probe (AuNP-probe) is designed by the combination of locked nucleic acid functionalized silencing of microRNA technology for intracellular microRNA-21 (miRNA-21) sensitively detecting, fluorescence imaging, localizing and silencing. The limit of detection is as low as 0.01 nM. Overexpressed miRNA-21 in cancer cells serves as endogenous drug release stimuli to trigger the release of probe-loaded doxorubicin (Dox), which soon translocates into cell nuclei. This multifunctional Dox-loaded AuNP-probe (Dox-AuNP-probe) could induce cancer cell apoptosis effectively through the synergistic effect of gene silencing and chemotherapy. This Dox-AuNP-probe exhibits superior drug potency compared to free Dox molecules, with a cell inhibition rate of 57% (but only 20% for Dox) to wild-type cancer cells and 30% (but 0% for Dox) to drug-resistent cancer cells after 72 h, and this strategy not only has the function of sensing, but also can effectively bypass drug resistance. In MCF-7 xenograft tumor-bearing mice, the Dox-AuNP-probes show greater inhibition for tumor tissues than miRNA-21 targeted AuNP-probes (Targeting-AuNP-probe) or free Dox molecules. Therefore, the Dox-AuNP-probe represents a promising nanotheranostic platform for future applications in cancer molecular imaging and therapy, especially providing a potential strategy to treat resistant cancers.
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Acknowledgements
This work was supported by the Natural Science Foundation of Shandong Province (ZR2015BM024), “Shandong Province Tai-Shan Program”, China Scholarship Council (CSC) scholarship to Dr. Hong, and the National Natural Science Foundation of China (21729501).
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A microRNA-21-responsive doxorubicin-releasing sticky-flare for synergistic anticancer with silencing of microRNA and chemotherapy
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Hong, M., Sun, H., Yang, Q. et al. A microRNA-21-responsive doxorubicin-releasing sticky-flare for synergistic anticancer with silencing of microRNA and chemotherapy. Sci. China Chem. 64, 1009–1019 (2021). https://doi.org/10.1007/s11426-020-9973-9
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DOI: https://doi.org/10.1007/s11426-020-9973-9