Abstract
In this study, we synthesized PLA-PEI micelles which was co-loaded with an anticancer drug, camptothecin (CPT), and survivin-shRNA (sur-shRNA). The hydrophobic CPT was encapsulated in the core of the polymeric micelles while sur-shRNA was adsorbed on the shell of the cationic micelles. Then, the positively-charged sur-shRNA-loaded micelles were coated with poly carboxylic acid dextran (PCAD) to form PLA/PEI-CPT-SUR-DEX. To selectively target the system to colon cancer cells, AS1411 aptamer was covalently attached to the surface of the PCAD-coated nanoparticles (PLA/PEI-CPT-SUR-DEX-APT). PLA/PEI-CPT-SUR-DEX-APT enhanced cellular uptake through receptor-mediated endocytosis followed by increased CPT accumulation, downregulation of survivin, and thereby 38% cell apoptosis. In C26 tumor-bearing mice models, after administered intravenously, PLA/PEI-CPT-SUR-DEX-APT and PLA/PEI-CPT-SUR-DEX formulations resulted in a significant inhibition of the tumor growth with tumor inhibition rate of 93% and 87%, respectively. Therefore, PLA/PEI-CPT-SUR-DEX-APT could be a versatile co-delivery vehicle for promising therapy of colorectal cancer.
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Acknowledgements
The authors are grateful for the Mashhad University of Medical Sciences (Grant no. 960957). This study was based on the Pharm D. thesis of SS.
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SS and ST: performance and formal analysis as well as writing—original draft. KA: formal analysis, review, and editing. SMT: formal analysis, review, and editing. MB: formal analysis. MR: conceptualization, supervision. MA: conceptualization, pereparation of final manuscript for submission, supervision. Finally, the paper was written through contributions of all authors. All authors have given approval to the final version of the paper.
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Sanati, S., Taghavi, S., Abnous, K. et al. Fabrication of anionic dextran-coated micelles for aptamer targeted delivery of camptothecin and survivin-shRNA to colon adenocarcinoma. Gene Ther 29, 55–68 (2022). https://doi.org/10.1038/s41434-021-00234-0
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DOI: https://doi.org/10.1038/s41434-021-00234-0
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