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Excessive neutrophils characterize chronic pressure ulcers
1Department of Biochemistry, Medical College of Virginia Campus of Virginia Commonwealth University, Richmond, Virginia 23298-0614, USA. rdiegelm@hsc.vcu.edu
Summary
Neutrophils heavily infiltrate chronic pressure ulcers, contributing to tissue breakdown and delayed healing. Their destructive enzymes are key factors in the persistence and severity of these wounds.
Area of Science:
- Wound healing research
- Cellular biology
- Dermatology
Background:
- Pressure ulcers develop due to ischemia, but their pathogenesis is complex.
- Chronic ulcers show elevated proteolytic enzymes, particularly from neutrophils.
Purpose of the Study:
- To characterize the cellular components involved in chronic pressure ulcer pathogenesis.
- To investigate the role of neutrophils in pressure ulcer chronicity.
Main Methods:
- Biopsies of granulation tissue from 11 patients with pressure ulcers were analyzed.
- Histology, myeloperoxidase activity assays, and cell lavage were performed.
- Cells from ulcer surfaces were collected for cytological characterization.
Main Results:
- Histology revealed dense neutrophil infiltration, edema, and matrix dissociation near ulcer surfaces.
- Lavage samples were over 95% neutrophils, with some macrophages phagocytosing neutrophils.
- Myeloperoxidase activity correlated significantly with neutrophil counts, confirming extensive neutrophil presence.
Conclusions:
- Chronic pressure ulcers exhibit extensive neutrophil infiltration in granulation tissue.
- Persistent neutrophils and their enzymes contribute to matrix dissociation and ulcer chronicity.