Despite recent advances in microsurgical techniques and equipments, recovery of function
following repair of transected nerves often remains suboptimal. Contrary to traumatic injuries vascular
damage that causes peripheral nerve injury has not been well-documented in the literature. In the present
study a total of 40 female rats were randomly divided into four groups: Group 1: intact controls (n: 10),
Group 2: sham-operated (n: 10), Group 3: vehicle-treated (n: 10), Group 4: melatonin-treated (n: 10).
Sciatic nerve damage was created by stripping of the epineurial vessels around the nerve. 50 mg/kg
Melatonin was injected intraperitoneally immediately after epineurial stripping in Group 4 in the course of 4 postoperative
weeks. We found that melatonin administration after stripping of the epineurial vessels exerted a beneficial effect on
axonal regeneration and functional recovery was confirmed by functional (sensory-motor, biochemical, and
electrophysiological analyses) and morphological (light microscopic and ultrastructural analyses) data. In the light of
these results we concluded that melatonin in a model of sciatic nerve injury leads to axonal regeneration, reducing in
oxidative stress, and improved functional recovery.