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

Jianli Chen,Han Zhang,Xue-Qin Huang,Hong-Ye Wan,Jieying Li,Xing-Xing Fan,K. Luo,Jinhua Wang,Xiao-Ming Zhu,Jianfang Wang

Published 2019 in Nano-Micro Letters

ABSTRACT

Titania-coated Au nanobipyramids (NBP@TiO2) with a high photothermal conversion efficiency in the NIR-II window are synthesized. The TiO2 shell is capable for the loading of the anticancer drug combretastatin A-4 phosphate (CA4P). The CA4P-loaded NBP@TiO2 nanostructures subjected with photothermal therapy induce synergistic anticancer and antiangiogenesis effects under 1064-nm laser irradiation at a power density lower than the skin tolerance threshold value. Titania-coated Au nanobipyramids (NBP@TiO2) with a high photothermal conversion efficiency in the NIR-II window are synthesized. The TiO2 shell is capable for the loading of the anticancer drug combretastatin A-4 phosphate (CA4P). The CA4P-loaded NBP@TiO2 nanostructures subjected with photothermal therapy induce synergistic anticancer and antiangiogenesis effects under 1064-nm laser irradiation at a power density lower than the skin tolerance threshold value. 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 (93.3 ± 5.2)% 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.

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