Improving
tumor oxygenation and concentrating X-ray radiation energy inside the
tumor have received considerable attention in
cancer radiotherapy. Herein, core-shell
tantalum oxide@
manganese dioxide (TaOx@MnO2) nanostructures are prepared as an efficient radiosensitizer for enhancing
radiotherapy (RT). In these nanostructures, the TaOx core serves as a RT sensitizer that efficiently concentrates X-ray radiation energy inside the
tumor, while the MnO2 shell may trigger the decomposition of endogenous H2O2 in the tumor microenvironment (TME) to generate
oxygen and overcome
hypoxia-associated radiation resistance. In vitro and in vivo experiments demonstrated that the synthesized TaOx@MnO2-PEG nanostructures could accomplish an excellent synergistic
radiotherapy sensitization effect. Furthermore, TaOx@MnO2-PEG nanoparticles could also serve as promising agents for MR/CT dual-modal imaging. In brief, our study highlights a new type of multifunctional radiosensitizer agent to enhance
radiotherapy treatment by means of simultaneously concentrating radiation energy inside
tumors and overcoming tumor hypoxia, promising for applications in
tumor radiotherapy.