Click-crosslinked nano-hydrogel enables metabolic immune reprogramming for diabetic foot ulcers

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Diabetic foot ulcers (DFUs) present complex healing challenges due to their unique microenvironment.
• Current biomaterials often fail to address multiple pathological factors in DFUs, hindering effective treatment.
• Developing multifunctional platforms is crucial for advancing DFU therapeutic strategies.

Purpose of the Study:

• To engineer a novel multifunctional drug delivery platform for enhanced diabetic foot ulcer treatment.
• To utilize amine-yne click chemistry for constructing a versatile hydrogel system.
• To incorporate metal-polyphenol nanoparticles (MPNs) for targeted drug delivery and synergistic effects.

Main Methods:

• Fabrication of a hydrogel platform using quaternized chitosan (QCS) and tetra-arm polyethylene glycol propiolate (4A-PEG-PA).
• Incorporation of epigallocatechin gallate (EGCG) and magnesium ions (Mg2+) to form MPNs for drug loading.
• Evaluation of the platform's physical properties, pH-responsive behavior, and therapeutic effects in vitro and in vivo.

Main Results:

• The developed hydrogel platform effectively fills dead space and adheres to wound surfaces.
• The system demonstrates pH-responsive drug release, potent antioxidant, and hypoglycemic activities.
• In vitro studies confirmed protection of mitochondrial function against oxidative stress.
• In vivo evaluations showed antimicrobial, anti-inflammatory, pro-angiogenic, and re-epithelialization properties.

Conclusions:

• The multifunctional hydrogel platform offers a promising strategy for managing diabetic foot ulcers.
• The integrated approach addresses multiple aspects of the DFU microenvironment, promoting accelerated healing.
• This innovative biomaterial represents a significant advancement in wound care for diabetic patients.