Multifunctional Dual Network Hydrogel Loaded with Novel Tea Polyphenol Magnesium Nanoparticles Accelerates Wound Repair of MRSA Infected Diabetes

Methicillin-resistant Staphylococcus aureus (MRSA) biofilm infection, caused by impaired glucose metabolism in diabetic foot patients, poses a significant obstacle to the healing process and carries a high risk of being life-threatening. Due to microvascular occlusion and the entrenchment of MRSA biofilms in diabetic foot, controlling and effectively treating MRSA infection remains challenging. Traditional hydrogels suffer from swelling-related mechanical issues and inadequate drug release control, limiting their applications as biomimetic extracellular matrices for wound healing. Herein, a double-network hydrogel composed of polyvinyl alcohol, sodium alginate, and gelatin (PSG) loaded with tea polyphenol self-assembled magnesium nanoparticles (TP-Mg NPs) with antibacterial and angiogenic properties for treating MRSA-infected diabetic foot wounds under hyperglycemic conditions is constructed. TP-Mg@PSG exhibits enhanced mechanical strength and toughness for wound attachment and recovery movement torsion. In the acidic infection microenvironment representative of MRSA-infected wounds, the TP-Mg@PSG hydrogel degrades to release TP-Mg NPs, showing excellent anti-MRSA biofilm effect and high biocompatibility. Such localized controlled release enhances the inhibition of MRSA infection and reduces the inflammatory response in rats, promoting cell proliferation and rapid wound repair. Therefore, this study presents a multifunctional biomaterial system for managing diabetic foot conditions, highlighting its potential for clinical applications.