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Angiogenesis induction and regression in human surgical wounds
Nicola J Brown1, Edward A E Smyth, Simon S Cross
1Academic Unit of Surgical Oncology, Division of Clinical Sciences, University of Sheffield, Sheffield, United Kingdom. N.J.Brown@Sheffield.ac.uk
Summary
Human wound healing involves prolonged angiogenesis, with increased microvessel density persisting even in mature scars. This study characterizes the temporal profile of blood vessel formation and structural changes in dermal wound repair.
Area of Science:
- Dermatology
- Vascular Biology
- Wound Healing Research
Background:
- Angiogenesis in human wound healing, including vessel maturation and fate, is poorly understood.
- Limited data exists on the long-term vascular changes following human tissue repair.
Purpose of the Study:
- To investigate the temporal profile of angiogenesis in human dermal wounds.
- To characterize the changes in microvessel density, vascular patterns, and tissue morphology during wound healing.
Main Methods:
- Punch biopsies were collected from 45 patients undergoing breast surgery, with scar ages ranging from 2 to over 52 weeks.
- Control samples (n=24) were obtained peroperatively.
- Vascular density was quantified using the Chalkley grid and antibody staining for platelet endothelial cell adhesion molecule (PECAM).
- Wound cellularity and morphology were also assessed.
Main Results:
- Microvessel density was significantly increased in all wound samples compared to controls (p < 0.05).
- Peak microvessel density occurred 2-24 weeks post-surgery, remaining elevated even in scars >52 weeks.
- Wounding caused significant structural distortion, persisting for up to 15 weeks.
Conclusions:
- Human dermal wounds exhibit prolonged angiogenesis with persistent microvessel elevation.
- Fibroblastic cellularity and structural distortion are also prolonged in human dermal wounds.
- Findings contrast with previous in vitro and in vivo studies, highlighting unique aspects of human wound healing.