Evaluating the Effects of Subclinical, Cyclic Ischemia-Reperfusion Injury on Wound Healing Using a Novel Device in the Rabbit Ear

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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.

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