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Photoactive Hybrid AuNR‐Pt@Ag 2 S Core–Satellite Nanostructures for Near‐Infrared Quantitive Cell Imaging
Author(s) -
Qu Aihua,
Xu Liguang,
Sun Maozhong,
Liu Liqiang,
Kuang Hua,
Xu Chuanlai
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201703408
Subject(s) - materials science , photothermal therapy , fluorescence , nanorod , fluorescence lifetime imaging microscopy , in vivo , nanotechnology , conjugated system , optics , biology , physics , microbiology and biotechnology , composite material , polymer
The quantitative detection of microRNA (miR) and multimode‐imaging‐induced photothermal therapy in vivo have become the focus of much attention. Platinum (Pt) decorated gold nanorods (AuNR‐Pt) and Ag 2 S core–satellite (AuNR‐Pt@Ag 2 S) multifunctional nanostructures are fabricated to quantify intracellular miRs (miR‐21), near‐infrared fluorescence cell quantitative imaging, and tumor ablation in vivo. When combined with miR‐21, the nanoassembly displays significant fluorescence intensity in the second window of the near‐infrared region (1000–1700 nm) after 808 nm excitation. The Ag 2 S fluorescence intensity has a good linear relationship with the amount of intracellular miR in the range of 0.054–20.45 amol ng RNA −1 and a limit of detection of 0.0082 amol ng RNA −1 . The nanoassembly is also used to develop multimodal bioimaging, including near‐infrared, X‐ray computed tomographic, and photoacoustic imaging in HeLa‐tumor‐bearing mice. Moreover, the tumors are completely eliminated by the high photothermal capacity of the AuNR‐Pt@Ag 2 S assembly. This nanoassembly provides a multifunctional nanoplatform for the ultrasensitive detection of miRs and tumor diagnosis and therapy in vivo.