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Optimization and validation of an ischemic wound model
Lisa J Gould1, Mimi Leong, Joseph Sonstein
1Division of Plastic Surgery, Department of Surgery, The University of Texas Medical Branch, Galveston, Texas 77555, USA. ljgould@utmb.edu
Summary
Researchers developed a reproducible ischemic wound model in rats. This model effectively mimics chronic wound conditions, showing impaired healing and increased lactate, aiding the study of new therapies.
Area of Science:
- Biomedical Engineering
- Wound Healing Research
- Animal Models
Background:
- Localized tissue ischemia is a critical factor in chronic wound development and poor prognosis.
- Existing animal and in vitro models lack the complexity to adequately study angiogenesis in ischemic wound beds.
Purpose of the Study:
- To develop a reproducible, standardized animal model for evaluating wound healing and angiogenesis-inducing therapies in ischemic conditions.
Main Methods:
- Male Sprague-Dawley rats underwent dorsal bipedicle skin flap creation with excisional wounds.
- Comparison of flap sizes (2.5 vs. 2.0 cm) with and without a silicone sheet to induce ischemia.
- Assessment of oxygen tension, wound-breaking strength, area, lactate, and vascular endothelial growth factor (VEGF).
Main Results:
- The 2.0 cm flap with silicone demonstrated critical ischemia up to 14 days (33+/-4 mmHg) without necrosis.
- Significantly impaired wound healing and breaking strength were observed in the 2.0 cm ischemic flap.
- Elevated tissue lactate (2.9x) and vascular endothelial growth factor (2x) were found in the ischemic flap center compared to controls.
Conclusions:
- A novel, reproducible, and cost-effective ischemic wound model was established.
- The model provides sufficient tissue for biochemical and histological analysis.
- This model is suitable for evaluating therapies aimed at inducing angiogenesis and improving chronic wound healing.