Synergistic antibacterial therapy for multidrug-resistant bacterial infections using multifunctional nanozymes

Multidrug-resistant (MDR) bacterial infections have become major threats to public health worldwide. To address this challenge, nanozyme with intrinsic enzyme-like activity has been used that can serve as broad-spectrum antibiotics. However, the efficacy of individual nanozyme is hindered by its limited catalytic activity and therapeutic efficiency. In this study, we develop broad-spectrum antibacterial nanocomposites, namely IrOx@PDA NPs-RSNO (IP NPs-RSNO), which demonstrate remarkable efficacy in eradicating MDR bacteria. The excellent antibacterial performance of IP NPs-RSNO is attributed to the synergistic effects of NIR photothermal property, NIR-enhanced peroxidase-like (POD-like) activity, and NIR-triggered release of NO. IP NPs-RSNO can effectively eliminate carbapenem-resistant Escherichia coli (CREC) and methicillin-resistant Staphylococcus aureus (MRSA), showing excellent therapeutic performance in treating MRSA-infected wounds. This work provides insights into the design of multifunctional nanozymes for antibacterial applications.