Intelligent response agarose/chitosan hydrogel wound dressing: Synergistic chemotherapy, PDT and PTT effects against bacterial infection

Jan 17, 2025International journal of biological macromolecules

Smart gel wound dressing combining chemotherapy, light therapy, and heat to fight bacterial infections

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Regenerative Health on OpenScience ↗PubMed ↗DOI ↗

Abstract

The AC-Gel@Cur-Au hydrogel significantly reduced inflammation and enhanced wound healing in a full-thickness defect model of S. aureus infection.

The hydrogel exhibited strong antibacterial activity against Escherichia coli and Staphylococcus aureus.
It demonstrated effective photodynamic and photothermal therapy upon irradiation.
The hydrogel showed good mechanical properties, swelling capacity, tissue adhesion, and biodegradability.
In vivo studies indicated significant promotion of granulation tissue formation, collagen deposition, and angiogenesis.
All components of the hydrogel were non-cytotoxic, suggesting good biocompatibility.

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Bacterial infections impede skin wound healing, and antibacterial hydrogels have garnered significant attention in the field of wound care due to their combined therapeutic effects. In this study, an intelligent, responsive AC-Gel@Cur-Au hydrogel was developed using temperature-sensitive agarose and pH-responsive chitosan as the structural framework, infused with Gel@Cur and AuNR. The AC-Gel@Cur-Au hydrogels demonstrated excellent mechanical properties, swelling capacity, tissue adhesion, and biodegradability. Upon irradiation, the hydrogels exhibited effective photodynamic therapy (PDT), photothermal therapy (PTT), and heat-sensitive gel-sol conversion capabilities, allowing for the release of curcumin in response to temperature and pH changes. Through these synergistic effects, the AC-Gel@Cur-Au hydrogel displayed a rapid bactericidal effect against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), effectively treating persistent biofilms. In vivo studies using a full-thickness defect model of S. aureus infection demonstrated that the hydrogel possessed strong antibacterial activity and enhanced wound healing capabilities, significantly reducing inflammation. Furthermore, the hydrogel significantly promoted granulation tissue formation, collagen deposition, and angiogenesis. Importantly, all the components of the AC-Gel@Cur-Au hydrogel were found to be non-cytotoxic, indicating good biocompatibility. This safe, synergistic antibacterial hydrogel holds great promise for the treatment of bacterial infections in wound healing.

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Intelligent response agarose/chitosan hydrogel wound dressing: Synergistic chemotherapy, PDT and PTT effects against bacterial infection

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