NIR-responsive MoS2-Cu2WS4 nanosheets for catalytic/photothermal therapy of methicillin-resistant Staphylococcus
Kaili Yang1, Weijun Xiu1, Yuqing Li1
1State Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China. iamlhyuwen@njupt.edu.cn.
Abstract:
The extensive usage of antibiotics causes the rapid evolution of drug-resistant bacteria, which seriously threaten human health. Thus, efficient strategies for treating drug-resistant bacterial infections are urgently needed. Herein, MoS2-Cu2WS4 nanosheets (MS-CWS NSs) are prepared as a near-infrared (NIR) light responsive nanozyme to effectively combat methicillin-resistant Staphylococcus aureus (MRSA) infections by catalytic/photothermal effects. By integrating oxidase (OXD)- and peroxidase (POD)-mimic catalytic activity, MS-CWS NSs have the ability to inactivate MRSA without the addition of H2O2. Moreover, the reactive oxygen species (ROS) produced from MS-CWS NSs are further enhanced by NIR light irradiation, which remarkably causes the death of MRSA. MS-CWS NSs show 4.4 log (99.996%) bacterial inactivation efficiency of MRSA in vitro under NIR light irradiation (0.8 W cm-2, 5 min). In an MRSA infected wound mouse model, MS-CWS NSs inactivate the MRSA by more than 5.2 log (>99.999%) and effectively promote wound healing. This work provides an NIR-responsive 2D nanozyme for efficient treatment of MRSA infections.
