Abstract
Photothermal agents, which can convert near-infrared light into heat with a minimal attenuation of the energy and prevent undesirable thermal damage to healthy tissue, provided an opportunity for accurate heat delivery to desired sites. Herein, we designed cyclo(Arg-Gly-Asp-D-Tyr-Lys) peptide c(RGDyK)-conjugated TiO2 nanoparticles (TiO2-RGD NPs) with an ideal biocompatibility and targeting property. TiO2-RGD NPs exhibited intense absorbance in near-infrared region, a high stability in physiological conditions, and the photothermal conversion efficiency of ~38.5%. Due to the specific affinity between c(RGDyK) and αvβ3 integrin, TiO2-RGD NPs showed the high targeting property for U87-MG cells with overexpression of αvβ3 integrin. After incubation with TiO2-RGD NPs (100 µg/mL) and under 808 nm near-infrared laser irradiation (1 W/cm2), the viability of MCF-7 cells by deficient expression of αvβ3 integrin was ~71%, while the viability of U87-MG decreased to ~31%, which have been demonstrated as an effective targeting photothermal therapy agent.
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Acknowledgements
This work was partially supported by National Natural Science Foundation of China (Nos. 21371122, and 21571130, 21671135), the Ministry of Education of China (PCSIRT_IRT_16R49), and International Joint Laboratory on Resource Chemistry of Ministry of Education (IJLRC).
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Zhao, H., Wang, M., Zhou, P. et al. RGD-conjugated titanium dioxide nanoparticles: targeted near-infrared photothermal therapy for αvβ3 integrin overexpressed cancer cells. J Mater Sci 52, 13356–13364 (2017). https://doi.org/10.1007/s10853-017-1083-9
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DOI: https://doi.org/10.1007/s10853-017-1083-9