Abstract
Asymmetric block copolymers PAAc-b-PAAm (DBC) and PAAm-b-PAAc-b-PAAm (TBC) comprised poly(acrylic acid) and polyacrylamide have been evaluated as potential vehicles for doxorubicin (Dox) targeted delivery. The processes of Dox release from the DBC and TBC micelles under the influence of the drug’s concentration gradient and various surrounding medium, such as NaCl solution and aqueous medium at pH= 5.75 and 9, were examined. The previously established tendency to significantly reduce the Dox encapsulation degree by the DBC and TBC micelles at the increase of the size of their “corona” was fully confirmed (Kunitskaya et al. 2018). Noticed that PAAm block’s lengthening complicated the Dox release against all environments under study. It was revealed that micelles which easily and effectively encapsulate Dox as easily "give away" the drug during dialysis. Increasing pH of the DBC and TBC solutions to 9 prevented drug release. It can be stipulated by enhancing interaction between Dox and micellar “core” caused by the ionization of –COOH groups contained in PAAc blocks. Preliminary biological investigations in vitro against human T-leukemia cells demonstrate essential anticancer activity of Dox/DBC and Dox/TDC compositions, as compared to pure Dox.
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Acknowledgements
We thank Dr. Mathias Destarac and Dr. Stéphane Masieres from Université Paul Sabatier (Toulose, France) for use of their laboratory during the synthetic part of the experiment as well as the Institute of Cell Biology NAS of Ukraine for providing biological investigations.
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Kunitskaya, L., Zheltonozhskaya, T., Gerda, V. et al. Development polymeric micellar system for targeted delivery of antitumor drugs. Appl Nanosci 12, 1315–1322 (2022). https://doi.org/10.1007/s13204-021-01876-7
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DOI: https://doi.org/10.1007/s13204-021-01876-7