Journal
BIOMATERIALS ADVANCES
Volume 136, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.bioadv.2022.212794
Keywords
Oxygen-deficient titanium dioxide; Black phosphorus; Photothermal therapy; Sonodynamic therapy; Biocompatibility
Categories
Funding
- National Natural Science Foundation of China [21975239, 51973203]
- University of Science and Technology of China
- First Affiliated Hospital of The University of Science and Technology of China
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The study successfully constructed a dual-functional nanocomposite for combined photothermal/sonodynamic therapy using black titanium dioxide and black phosphorus nanosheets. The nanocomposite exhibits a high photothermal conversion capability and the ability to produce reactive oxygen species, leading to effective tumor inhibition.
Malignant tumors, particularly those located in deep tissues, have always been a grievous threat to human health. Sonodynamic therapy (SDT) has recently attracted great attention due to deep tissue penetration. However, the lack of effective sonosensitizers and the poor therapeutic efficacy severely limit their wider use. Herein, dual-functionalized black phosphorus nanosheets (BP@PEI-PEG, i.e., PPBP) integrating black oxygen-deficient titanium dioxide particles (B-TiO2) were successfully constructed (PPBP-B-TiO2) for synergistic photothermal (PTT)/sonodynamic therapy. In these nanocomposites, black titanium dioxide can enhance the separation of electrons (e(-)) and holes (h(+)) due to the oxygen-deficient structure and significantly improves the production of reactive oxygen species (ROS) for SDT, while the BP nanosheets endow the nanocomposites with a higher photothermal conversion capability for photothermal therapy (eta = 44.1%) which can prolong the blood circulation and improve the O-2 supply. In vivo experiments prove that PPBP-B-TiO2 nanocomposites exhibited outstanding tumor inhibition efficacy and excellent biocompatibility. This work provides a prospective platform for combined photothermal/sonodynamic cancer therapy.
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