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Diketopyrrolopyrrole-Au(I) as singlet oxygen generator for enhanced tumor photodynamic and photothermal therapy

  • Xiaoyu Huang
  • Rui Gu
  • Jiewei Li
  • Nan Yang
  • Zijin Cheng
  • Weili SiEmail author
  • Peng ChenEmail author
  • Wei Huang
  • Xiaochen DongEmail author
Articles
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Abstract

Diketopyrrolopyrrole (DPP) derivatived photosensitizers (PSs) with near infrared (NIR) absorption and good photophysical properties have drawn tremendous attention in cancer phototherapy. However, current DPP derivatives present unsatisfactory quantum yield of singlet oxygen (1O2) due to the large energy gap between the excited singlet and triplet states. To tackle this challenge, herein the DPP core is functionalized with triphenylphosphine-Au(I) group (ThDPP-Au), leading to a high 1O2 quantum yield of 0.65. Theoretical calculation attributes the enhancement to spin-orbit coupling and population of the triplet excition upon photoexcitation. The hydrophilic ThDPP-Au nanoparticals (NPs) are prepared via nano-reprecipitation, which displays homogeneous size and excellent light absorption ability (ε=4.382×104 M−1 cm−1). And the ThDPP-Au NPs exhibit low dark toxicity and high phototoxicity, which can effectively kill tumor cells via 1O2 induced mitochondrial apoptotic pathway upon irradiation. Furthermore, in vivo experiments demonstrate that ThDPP-Au NPs can selective accumulation in tumor and present excellent synergistic photodynamic/photothermal therapy guided by fluorescence and photothermal dual imaging.

diketopyrrolopyrrole-Au(I) singlet oxygen photodynamic therapy photothermal therapy 

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Notes

Acknowledgements

This work was supported by the National Natural Science of Foundation of China (61525402, 61775095, 21704043), Jiangsu Provincial Key Research and Development Plan (BE2017741), the Natural Science Foundation of Jiangsu Province (BK20170990, 17KJB150020) and the Six talent peak innovation team in Jiangsu Province (TD-SWYY-009).

Supplementary material

11426_2019_9531_MOESM1_ESM.doc (2.9 mb)
Diketopyrrolopyrrole-Au(I) as singlet oxygen generator for enhanced tumor photodynamic and photothermal therapy

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)Nanjing Tech University (NanjingTech)NanjingChina
  2. 2.School of Chemical and Biomedical EngineeringNanyang Technological UniversityNanyangSingapore
  3. 3.School of Chemistry and Materials ScienceNanjing University of Information Science & TechnologyNanjingChina
  4. 4.Shaanxi Institute of Flexible Electronics (SIFE)Northwestern Polytechnical University (NPU)Xi’anChina

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