11December2019

Nano-Micro Letters

Antiangiogenesis-Combined Photothermal Therapy in the Second Near-Infrared Window at Laser Powers below the Skin Tolerance Threshold

Jian-Li Chen1, Han Zhang2, Xue-Qin Huang1, Hong-Ye Wan1, Jie Li1, Xing-Xing Fan1, Kathy Qian Luo3, Jinhua Wang4, Xiao-Ming Zhu1, *, Jianfang Wang2, *

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Nano-Micro Lett. (2019) 11: 93

First Online: 31 October 2019 (Article)

DOI:10.1007/s40820-019-0327-4

*Corresponding author. E-mail: xmzhu@must.edu.mo (X.-M. Zhu); jfwang@phy.cuhk.edu.hk (J. F. Wang)

 

Abstract

 


Toc

Photothermal agents with strong light absorption in the second near-infrared (NIR-II) region (1000–1350 nm) are strongly desired for successful photothermal therapy (PTT). In this work, titania-coated Au nanobipyramids (NBP@TiO2) with a strong plasmon resonance in the NIR-II window were synthesized. The NBP@TiO2 nanostructures have a high photothermal conversion efficiency of under 1064-nm laser irradiation. They are also capable for loading an anticancer drug combretastatin A-4 phosphate (CA4P). In vitro PTT studies reveal that 1064-nm laser irradiation can efficiently ablate human lung cancer A549 cells and enhance the anticancer effect of CA4P. Moreover, the CA4P-loaded NBP@TiO2 nanostructures combined with PTT induce a synergistic antiangiogenesis effect. In vivo studies show that such CA4P-loaded NBP@TiO2 nanostructures under mild 1064-nm laser irradiation at an optical power density of 0.4 W cm–2, which is lower than the skin tolerance threshold value, exhibit a superior antitumor effect. This work presents not only the development of the NBP@TiO2 nanostructures as a novel photothermal agent responsive in the NIR-II window but also a unique combined chemo-photothermal therapy strategy for cancer therapy.


 

Keywords

Antiangiogenesis therapy; Core@shell nanostructures; Gold nanobipyramids; Photothermal therapy; Plasmon resonance

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