4.8 Article

pH/NIR-responsive semiconducting polymer nanoparticles for highly effective photoacoustic image guided chemo-photothermal synergistic therapy

Journal

JOURNAL OF CONTROLLED RELEASE
Volume 293, Issue -, Pages 94-103

Publisher

ELSEVIER
DOI: 10.1016/j.jconrel.2018.11.016

Keywords

Semiconducting polymer; pH/NIR-responsive; Chemo-photothermal therapy; Photoacoustic image; Drug release; Doxorubicin

Funding

  1. National Key Research and Development Program of China [2017YFA0205302]
  2. National Natural Science Foundation of China [21574069, 21475064]
  3. Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R37]
  4. Key Research and Development Program of Jiangsu [BE2018732]
  5. Natural Science Key Fund for Colleges and Universities in Jiangsu Province [17KJA430011]

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Multifunctional drug delivery nanoplatform (PDPP3T@PSNiAA NPs) based on NIR absorbing semiconducting polymer nanoparticles for pH/NIR light-controllably regulated drug release has been successfully prepared. In this strategy, pH/thermal-sensitive multifunctional polymer polystyrene-b-poly(N-isopropylacrylamide-co-acrylic acid) (PSNiAA) was meticulously designed and synthesized using the reversible addition fragmentation chain transfer (RAFT) polymerization method. Furthermore, PSNiAA was used to functionalize diketopyrrolopyrrole-based semiconducting polymer (PDPP3T) to combine photothermal capacity and pH/thermo-responsive drug release in one entity. The prepared PDPP3T@PSNiAA NPs exhibited high photothermal conversion efficiency (eta = 34.1%) and excellent photoacoustic (PA) brightness. Meanwhile, benefiting from the photothermal effect of PDPP3T and the pH/thermal-responsive properties of PSNiAA, Dox-loaded PDPP3T@PSNiAA NPs (PDPP3T@PSNiAA-Dox NPs) were able to controllably regulate the release of Dox by pH/NIR light, in which the enhanced drug release at acidic condition upon NIR irradiation phenomenon would minimize unnecessary drug release in normal tissues and was highly beneficial for precise synergistic chemo-and photothermal therapy.

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