期刊
ADVANCED SCIENCE
卷 6, 期 11, 页码 -出版社
WILEY
DOI: 10.1002/advs.201900158
关键词
anisotropic heterostructures; fluorescence amplification; hot electrons; phototherapy; theranostics
资金
- National Natural Science Foundation of China [21573216, 21703232, 61471345]
- Recruitment Program of Global Youth Experts (1000 plans)
- Hundred Talent Program of Chinese Academy of Sciences
- Science and Technology Development Project Foundation of Jilin Province [20160101304JC, 20180520145JH]
- Shanghai Science and Technology Committee [16JC1403500]
The development of sophisticated theranostic systems for simultaneous near infrared (NIR) fluorescence imaging and phototherapy is of particular interest. Herein, anisotropic plasmonic metal heterostructures, Pt end-deposited Au nanorods (PEA NRs), are developed to efficiently produce hot electrons under 808 nm laser irradiation, exhibiting the strong electric density. These hot electrons can release the heat through electron-phonon relaxation and form reactive oxygen species through chemical transformation, as a result of potent photothermal and photodynamic performance. Simultaneously, the confined electromagnetic field of PEA NRs can transfer energy to adjacent polyethylene glycol (PEG)-linked NIR fluorophores (CF) based on their energy overlap mechanism, leading to remarkable NIR fluorescence amplification in CF-PEA NRs. Various PEG linkers (1, 3.4, 5.0, and 10 kD) are employed to regulate the distance between CF and PEA NRs of CF-PEA NRs, and the maximum fluorescence intensity is achieved in CF5k-PEA NRs. After further attachment with i-motif DNA/Nrf2 siRNA chimera to simultaneously suppress both cellular antioxidant defense and hyperthermia resistance effects, the final biocompatible CF5k -bPEA@siRNA NRs present promising NIR fluorescence imaging ability and 808 nm laser-activated photothermal and photodynamic therapeutic effect in MCF7 cells and tumor-bearing mice, holding great potential for cancer therapy.
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