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Related Concept Videos

Inflammatory Response II: Inflammatory Exudate and Tissue Repair01:24

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The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
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Updated: Aug 30, 2025

Doxycycline Loaded Collagen-Chitosan Composite Scaffold for the Accelerated Healing of Diabetic Wounds
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Catechol-chitosan/polyacrylamide hydrogel wound dressing for regulating local inflammation.

Bingyang Lu1,2, Xiao Han1,2, Dan Zou1,2

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, China.

Materials Today. Bio
|August 29, 2022
PubMed
Summary

This study developed advanced double-network hydrogels from catechol-chitosan for chronic wound healing. These smart hydrogels effectively manage inflammation and promote tissue repair.

Keywords:
Chronic wounds and inflammationDouble network hydrogelDrug deliveryResolvinpH and redox responsive

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Wound Healing

Background:

  • Chronic wounds present challenges due to inflammation, low pH, and oxidative stress, hindering healing.
  • Conventional wound dressings offer limited therapeutic benefits for chronic wounds.
  • Chitosan hydrogels show promise but have poor mechanical properties, limiting their clinical application.

Purpose of the Study:

  • To develop novel double-network (DN) hydrogels with enhanced mechanical properties and biocompatibility for chronic wound treatment.
  • To create a smart drug delivery system for targeted release of anti-inflammatory agents in the chronic wound microenvironment.
  • To investigate the efficacy of catechol-chitosan based DN hydrogels loaded with Resolvin E1 (RvE1) in regulating inflammation and promoting wound repair.

Main Methods:

  • Preparation of bioadhesive catechol-chitosan based double-network (DN) hydrogels using polyacrylamide.
  • Incorporation of disulfide bonds for redox-responsive properties and acetalized cyclodextrin (ACD) nanoparticles for pH-responsive drug release.
  • Loading of Resolvin E1 (RvE1) into ACD nanoparticles for targeted delivery of inflammation-resolving factors.
  • Evaluation of hydrogel properties, including mechanical strength, biocompatibility, and drug release kinetics.
  • Assessment of cell adhesion, inflammatory response modulation, and wound healing promotion in a chronic wound model.

Main Results:

  • Successfully synthesized DN hydrogels with improved mechanical properties compared to traditional chitosan hydrogels.
  • Developed redox- and pH-responsive nanoparticles for controlled and intelligent release of RvE1.
  • Demonstrated enhanced cell adhesion due to catechol group incorporation.
  • Showed effective regulation of the inflammatory microenvironment and promotion of wound repair by the loaded RvE1 within the DN hydrogel system.

Conclusions:

  • The developed catechol-chitosan based DN hydrogels offer a promising platform for chronic wound management.
  • Intelligent drug delivery systems integrated into these hydrogels can accurately target and modulate the wound inflammatory microenvironment.
  • This approach provides a novel strategy for enhancing wound healing through improved biocompatibility, mechanical strength, and targeted delivery of anti-inflammatory agents.