Microenvironment-Responsive Xanthotoxol-Copper Nanozyme for MRSA-Infected Wound Healing

Area of Science:

• Biomaterials Science
• Wound Healing Research
• Antimicrobial Development

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) infections pose significant challenges to wound healing due to oxidative stress and inflammation.
• Xanthotoxol (XT), a natural product, exhibits antibacterial and anti-inflammatory properties but suffers from poor water solubility, limiting its therapeutic application.
• Developing effective treatments for MRSA-infected wounds requires strategies to overcome the limitations of natural compounds and address the complex wound healing environment.

Purpose of the Study:

• To enhance the solubility and therapeutic efficacy of xanthotoxol (XT) for treating MRSA-infected wounds.
• To develop a novel composite material (XT-PEI-Cu) with dual-action capabilities responsive to the wound microenvironment.
• To investigate the antibacterial and wound healing-promoting properties of XT-PEI-Cu in the context of MRSA infections.

Main Methods:

• Modification of xanthotoxol (XT) with polyethylenimine (PEI) to improve water solubility.
• Fabrication of a copper-based composite material, XT-PEI-Cu, with glutathione lyase (GSH-X)-like activity.
• Evaluation of XT-PEI-Cu's response to varying pH conditions mimicking wound microenvironments (acidic infection phase vs. neutralized remodeling phase).

Main Results:

• XT-PEI-Cu demonstrated potent antibacterial activity by depleting intracellular glutathione (GSH) in bacteria under acidic conditions.
• In the neutralized wound environment, XT-PEI-Cu effectively scavenged reactive oxygen species (ROS), reduced inflammatory cytokines, and promoted angiogenesis and collagen deposition.
• The composite material shifted its function based on the microenvironment, enhancing bacterial clearance and facilitating wound repair.

Conclusions:

• The developed XT-PEI-Cu composite offers a promising strategy for treating MRSA-infected wounds by leveraging the dual-action properties of xanthotoxol.
• The microenvironment-responsive nature of XT-PEI-Cu enhances its therapeutic effectiveness throughout the wound healing process.
• This approach highlights the potential of modifying natural products to overcome limitations and improve their application in treating complex infections like MRSA wounds.