A Bio-Responsive Hydrogel with Spatially Heterogeneous Structure for Treating Infectious Tissue Injuries

Area of Science:

• Biomaterials Science
• Infectious Disease Research
• Nanotechnology

Background:

• Infectious tissue injuries are complicated by bacterial infections and antibiotic resistance, leading to severe health risks.
• Current treatments face challenges in efficacy and managing systemic infections.

Purpose of the Study:

• To develop a bio-responsive hydrogel system for treating infectious tissue injuries.
• To leverage silver ions encapsulated in polyoxometalates for targeted antibacterial activity.
• To enhance regenerative potential through integrated bioactive exosomes.

Main Methods:

• Fabrication of fiber membranes using a dual-channel technique for controlled polyoxometalate (POM) incorporation.
• In situ hierarchical cross-linking to create a spatially heterogeneous hydrogel with an interpenetrating network.
• Integration of silver ions (Ag⁺) within Preyssler-type POMs for controlled release triggered by sodium ions (Na⁺).
• Incorporation of bioactive exosomes to promote tissue regeneration.

Main Results:

• The hydrogel demonstrated selective Ag⁺ release in response to Na⁺, providing broad-spectrum antibacterial activity.
• The POM matrix preserved Ag⁺ bioactivity while reducing cytotoxicity and antimicrobial efficacy loss.
• The fabricated hydrogel exhibited a unique multi-scale interpenetrating network structure for controlled therapeutic release.
• In vitro and in vivo studies confirmed the hydrogel's efficacy in treating infectious tissue injuries.

Conclusions:

• The developed bio-responsive hydrogel system is an effective platform for managing infectious tissue injuries.
• This advanced material offers a promising strategy to overcome challenges posed by bacterial infections and antibiotic resistance.
• The combination of controlled silver ion release and exosome integration enhances both antimicrobial and regenerative functions.