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Biodegradable Bismuth-Based Nano-Heterojunction for Enhanced Sonodynamic Oncotherapy through Charge Separation
Kang Song1, Jun Du1, Xiang Wang1
1Institute of Bismuth Science and School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, China.
Advanced Healthcare Materials
|February 3, 2022
Summary
This study introduces a novel bismuth-based nanomaterial for enhanced sonodynamic therapy. The material improves reactive oxygen species generation and combines thermal therapy for amplified tumor damage.
Area of Science:
- Biomedical Engineering
- Materials Science
- Oncology
Background:
- Sonodynamic therapy (SDT) utilizes ultrasound to generate reactive oxygen species (ROS) for tumor treatment.
- Current SDT methods face challenges in improving ROS generation efficiency and achieving sustained oxidative damage.
- Developing advanced sonosensitizers is crucial for enhancing SDT efficacy.
Purpose of the Study:
- To prepare a novel ternary heterojunction sonosensitizer (Bi@BiO2-x@Bi2S3-PEG, BOS) for enhanced sonodynamic therapy.
- To investigate the synergistic effects of ROS generation, continuous oxidative stress, and photothermal therapy.
- To evaluate the amplified therapeutic efficacy of BOS in tumor treatment.
Main Methods:
- Fabrication of a ternary heterojunction nanomaterial (BOS) composed of Bi@BiO2-x@Bi2S3-PEG.
- Characterization of BOS for its properties, including oxygen vacancies and localized surface plasmon resonance.
- Evaluation of ROS generation, glutathione consumption, and photothermal conversion efficiency under ultrasound and near-infrared irradiation.
- Assessment of the synergistic sonodynamic and photothermal therapeutic effects on tumors.
Main Results:
- The BOS material demonstrated efficient ROS generation due to oxygen vacancies and localized surface plasmon resonance.
- BOS facilitated continuous oxidative stress by consuming glutathione, promoting tumor cell damage.
- Photothermal conversion of BOS under near-infrared irradiation enhanced thermal tumor damage and alleviated hypoxia.
- The combined sonodynamic and photothermal therapy significantly amplified therapeutic efficacy.
Conclusions:
- The developed BOS ternary heterojunction sonosensitizer offers a promising strategy for enhanced sonodynamic therapy.
- The combination of ROS generation, continuous oxidative stress, and photothermal therapy provides synergistic antitumor effects.
- Bismuth-based heterojunction nanomaterials show potential as effective sonosensitizers for cancer treatment.
