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Bioreducible unimolecular micelles based on amphiphilic multiarm hyperbranched copolymers for triggered drug release

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  • SPECIAL TOPIC · Highly Branched Polymers — Promising Architectural Macromolecules
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Abstract

A novel type of bioreducible amphiphilic multiarm hyperbranched copolymer (H40-star-PLA-SS-PEG) based on Boltorn® H40 core, poly(l-lactide) (PLA) inner-shell, and poly(ethylene glycol) (PEG) outer-shell with disulfide-linkages between the hydrophobic and hydrophilic moieties was developed as unimolecular micelles for controlled drug release triggered by reduction. The obtained H40-star-PLA-SS-PEG was characterized in detail by nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), gel permeation chromatography (GPC), differential scanning calorimeter (DSC), and thermal gravimetric analysis (TGA). Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analyses suggested that H40-star-PLA-SS-PEG formed stable unimolecular micelles in aqueous solution with an average diameter of 19 nm. Interestingly, these micelles aggregated into large particles rapidly in response to 10 mM dithiothreitol (DTT), most likely due to shedding of the hydrophilic PEG outer-shell through reductive cleavage of the disulfide bonds. As a hydrophobic anticancer model drug, doxorubicin (DOX) was encapsulated into these reductive unimolecular micelles. In vitro release studies revealed that under the reduction-stimulus, the detachment of PEG outer-shell in DOX-loaded micelles resulted in a rapid drug release. Flow cytometry and confocal laser scanning microscopy (CLSM) measurements indicated that these DOX-loaded micelles were easily internalized by living cells. Methyl tetrazolium (MTT) assay demonstrated a markedly enhanced drug efficacy of DOX-loaded H40-star-PLA-SS-PEG micelles as compared to free DOX. All of these results show that these bioreducible unimolecular micelles are promising carriers for the triggered intracellular delivery of hydrophobic anticancer drugs.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yan Pang, JinYao Liu, Yue Su, Wei Huang, YongFeng Zhou, XinYuan Zhu & DeYue Yan

  2. Instrumental Analysis Center, Shanghai Jiao Tong University, Shanghai, 200240, China

    BangShang Zhu & XinYuan Zhu

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  1. Yan Pang
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  2. JinYao Liu
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  3. Yue Su
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  4. BangShang Zhu
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  5. Wei Huang
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  6. YongFeng Zhou
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  7. XinYuan Zhu
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  8. DeYue Yan
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Correspondence to XinYuan Zhu or DeYue Yan.

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Pang, Y., Liu, J., Su, Y. et al. Bioreducible unimolecular micelles based on amphiphilic multiarm hyperbranched copolymers for triggered drug release. Sci. China Chem. 53, 2497–2508 (2010). https://doi.org/10.1007/s11426-010-4163-0

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  • DOI: https://doi.org/10.1007/s11426-010-4163-0

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