Evaluating the effects of subclinical, cyclic ischemia-reperfusion injury on wound healing using a novel device in the rabbit ear.

Abstract

OBJECTIVE: This study aimed to evaluate the effect of cyclic ischemia-reperfusion (IR) injury on wound healing using a novel rabbit ear model. MATERIALS AND METHODS: A lightweight clamp apparatus was developed for reversible occlusion of the central ear artery. Ventral ear wounds were analyzed postoperatively for epithelialization and granulation as well as gene expression after 3 consecutive days of IR cycling. RESULTS: By postoperative day #7, ears showed no gross tissue necrosis, but histologic analysis of wounds confirmed a significant impairment in epithelial and granulation tissue gaps as well as total epithelial and granulation tissue areas (P < 0.001). Quantitative polymerase chain reaction analysis of IR wounds indicated significant up-regulation of heat shock protein-70 and down-regulation of superoxide dismutase 1 relative to sham controls (P < 0.05). CONCLUSIONS: A novel rabbit ear model for the induction of subclinical, cyclic IR injury in cutaneous tissue has been developed that will serve as a valuable tool for the testing of new therapeutics.