Glucose-Responsive Antioxidant Hydrogel Accelerates Diabetic Wound Healing

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Diabetic complications, such as chronic wounds, are exacerbated by oxidative stress.
• Effective antioxidant delivery to diabetic wounds requires advanced therapeutic scaffolds.
• Current treatments lack targeted, responsive delivery systems for antioxidants.

Purpose of the Study:

• To develop an intelligent, glucose-responsive antioxidant hydrogel scaffold for enhanced diabetic wound healing.
• To create a hydrogel system capable of controlled release of antioxidants based on glucose concentration.
• To evaluate the efficacy of the developed hydrogel in ameliorating oxidative stress and promoting tissue regeneration in diabetic wounds.

Main Methods:

• Synthesized a gelatin methacryloyl (GelMA) derivative (GelMA-CPBA) by modifying GelMA with 4-carboxyphenyboronic acid (CPBA).
• Fabricated a glucose-responsive antioxidant hydrogel (GMPE) by photo-crosslinking GelMA-CPBA with (-)-epigallocatechin-3-gallate (EGCG).
• Characterized the hydrogel's properties, including glucose responsiveness, biocompatibility, biodegradability, and mechanical strength, and evaluated its performance in vitro and in vivo.

Main Results:

• The GMPE hydrogel demonstrated glucose-responsive release of EGCG, with increased release at higher glucose concentrations.
• The hydrogel exhibited excellent biocompatibility and biodegradability, with mechanical properties similar to skin tissue.
• In vitro and in vivo studies showed that GMPE hydrogels effectively scavenged reactive oxygen species (ROS), reduced inflammation, promoted angiogenesis, and improved collagen deposition and tissue remodeling.

Conclusions:

• The developed glucose-responsive antioxidant hydrogel (GMPE) shows significant potential for treating chronic diabetic wounds.
• This intelligent scaffold offers a novel strategy for targeted antioxidant delivery, addressing key challenges in diabetic wound healing.
• The findings provide new insights into the design of responsive biomaterials for managing diabetic complications.