Journal
BIOMATERIALS SCIENCE
Volume 8, Issue 22, Pages 6225-6234Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0bm01239d
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Funding
- National Natural Science Foundation of China [21703198, 81671810]
- Natural Science Foundation of Jiangsu Province [BK20170508]
- Qing Lan Project of Yangzhou University
- High-Level Talent Support Plan of Yangzhou University
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions
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Developing alternative treatment strategies against methicillin-resistant Staphylococcus aureus (MRSA) infections is a challenge but could have many potential applications. In this paper, we developed a novel approach to eradicate MRSA through photolysis of the staphyloxanthin (STX) pigment found within the MRSA membranes and intracellular molecules (e.g. genomic DNA and proteins). Specifically, Cu-doped hollow carbon spheres (Cu-HCSs) were employed here for antibacterial treatment. Unlike blue-light treatment alone, which only injured MRSA, Cu-HCSs in combination with blue-light irradiation promoted photobleaching of STX to destroy membrane integrity, and further caused oxidative cleavage of DNA and proteins inside MRSA, working as a nuclease/protease mimicking nanozyme, resulting in efficient killing of MRSA. Mechanism analysis showed that the cleavage activity resulted from the elevated levels of singlet oxygen (O-1(2)) generated from the photosensitized oxidation of Cu-HCSs. Further animal studies demonstrated that the photolysis activity of Cu-HCSs could be used to treat subcutaneous abscesses and bacteremia caused by MRSA. Thus, this photolysis-based antibacterial platform may help avoid bacterial resistance, with the potential to kill multidrug resistant bacteria.
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