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Size-tunable nanoparticles composed of dextran-b-poly(D,L-lactide) for drug delivery applications

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Abstract

Nanoparticles (NPs) formulated using self-assembly of block copolymers have attracted significant attention as nano-scaled drug delivery vehicles. Here we report the development of a biodegradable NP using self-assembly of a linear amphiphilic block copolymer, Dex-b-PLA, composed of poly(D,L-lactide), and dextran. The size of the NPs can be precisely tuned between 15 and 70 nm by altering the molecular weight (M W) of the two polymer chains. Using doxorubicin as a model drug, we demonstrated that the NPs can carry up to 21% (w/w) of the drug payload. The release profile of doxorubicin from NPs showed sustained release for over 6 days. Using a rat model, we explored the pharmacokinetics profiles of Dex-b-PLA NPs, and showed proof-of-concept that long circulation lifetime of the NPs can be achieved by tuning the M W of Dex-b-PLA block copolymer. While the terminal half-life of Dex-b-PLA NPs (29.8 h) was similar to that observed in poly(ethylene glycol)-coated (PEG-coated) NPs (27.0 h), 90% of the injected Dex-b-PLA NPs were retained in the blood circulation for 38.3 h after injection, almost eight times longer than the PEG-coated NPs. The area under curve (AUC) of Dex-b-PLA NPs was almost four times higher than PEG-based NPs. The biodistribution study showed lower accumulation of Dex-b-PLA NPs in the spleen with 19.5% initial dose per gram tissue (IDGT) after 24 h compared to PEG-coated poly(lactide-co-glycolide) (PLGA) NPs (29.8% IDGT). These studies show that Dex-b-PLA block copolymer is a promising new biomaterial for making controlled nanoparticles as drug delivery vehicles.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Waterloo, Waterloo, N2L 3G1, Canada

    Mohit S. Verma, Shengyan Liu, Yih Y. Chen, Ameena Meerasa & Frank X. Gu

  2. Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, N2L 3G1, Canada

    Frank X. Gu

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  1. Mohit S. Verma
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  2. Shengyan Liu
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  3. Yih Y. Chen
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  5. Frank X. Gu
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Correspondence to Frank X. Gu.

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Verma, M.S., Liu, S., Chen, Y.Y. et al. Size-tunable nanoparticles composed of dextran-b-poly(D,L-lactide) for drug delivery applications. Nano Res. 5, 49–61 (2012). https://doi.org/10.1007/s12274-011-0184-z

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