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The structure and composition of chronic wound eschar
A M Thomas1, K G Harding, K Moore
1Wound Healing Research Unit, University of Wales College of Medicine, Cardiff, UK.
Journal of Wound Care
|April 25, 2000
Summary
Chronic wound eschar has a complex structure requiring multiple enzymes for debridement. Inflammatory leukocytes infiltrating the eschar may supply these enzymes, targeting extracellular matrix proteins for wound healing.
Area of Science:
- Biomedical Engineering
- Wound Healing Research
- Tissue Analysis
Background:
- Eschar in chronic wounds impedes healing and requires debridement.
- Current debridement methods lack empirical evidence regarding eschar composition.
- Understanding eschar's structure is crucial for developing targeted autolytic debridement strategies.
Purpose of the Study:
- To determine the composition of chronic wound eschar.
- To identify potential targets for inducing autolytic debridement.
- To elucidate the role of leukocytes and enzymes in eschar degradation.
Main Methods:
- Surgical debridement of chronic wound eschar.
- Immunohistochemistry for extracellular matrix (ECM) protein analysis.
- Polyacrylamide gel electrophoresis (PAGE) and gelatin zymography for protein and enzyme activity assessment.
Main Results:
- Eschar exhibits a distinct structure with fibrous and amorphous regions.
- Leukocytes are present near the wound bed, correlating with gelatinase activity.
- PAGE identified various protein species (3.5-60 kDa), potentially including ECM proteins and degradation products.
Conclusions:
- Effective eschar debridement likely necessitates multiple enzyme specificities.
- Inflammatory leukocytes infiltrating eschar may provide essential enzymes for degradation.
- Identified protein species and enzyme activities offer targets for enhanced autolytic debridement therapies.