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Gold nanospheres enhanced photothermal therapy in a rat model
Author(s) -
Xing Linzhuang,
Chen Bin,
Li Dong,
Wu Wenjuan,
Ying Zhaoxia
Publication year - 2018
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.22793
Subject(s) - photothermal therapy , laser , irradiation , colloidal gold , photothermal effect , in vivo , biomedical engineering , materials science , pulse duration , chemistry , nanoparticle , nanotechnology , optics , medicine , physics , microbiology and biotechnology , nuclear physics , biology
Background and Objective Efficient photothermal conversion of gold nanoparticles with strong light absorption suggests their wide use as selective photothermal agents in biomedical fields. The aim of this study is to investigate the use of gold nanospheres (GNPs) as exogenous visible light absorbers to improve laser treatment of port‐wine stains. Materials and Methods Thiol‐terminated methoxypolyethylene glycol modified GNPs (PEG‐GNPs) with peak extinction matching the visible light wavelength of the laser being used were synthesized. An in vitro capillary experiment was prepared to investigate the thermal response of blood vessels with and without injection of 4.54 mg PEG‐GNPs in mice prior to irradiation by a frequency‐doubled Nd:YAG laser at a wavelength of 532 nm. Results The in vitro results demonstrated that the photocoagulation size in blood vessels after exposed to laser light increased with the increment of concentration of PEG‐GNPs in blood within a certain range. However, the unwanted thermal response (i.e., cavitation) occurred when the concentration of PEG‐GNPs in blood was larger than 2.5 mg/ml. The in vivo results suggested that more obvious blood thermal response can be induced by laser light after injection of PEG‐GNPs. After injection of 4.54 mg PEG‐GNPs, laser radiant exposure required for thread‐like constriction of blood vessels decreased from 12.5 to 9.8 J/cm 2 with the pulse duration of 10 ms, from 15 to 11.85 J/cm 2 with the pulse duration of 30 ms, respectively. Conclusion This in vitro and in vivo experimental results show that PEG‐GNPs combined with laser light could be a promising modality to reduce the radiant exposure required for obvious blood thermal response, thereby providing a potential strategy for improving the laser treatment of cutaneous vascular lesions. Lasers Surg. Med. 50:669–679, 2018. © 2018 Wiley Periodicals, Inc.