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Published on: May 5, 2020
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Systemic Melatonin Improves Regeneration After Facial Nerve Crush Injury in a Rat Model
Atahan Unaldi1, Fatma Helvacioglu2, Nurettin Diker3
1PhD Candidate, Department of Oral and Maxillofacial Surgery, Institute of Health Science, Bezmialem Vakif University, Istanbul, Turkiye.
Summary
Systemic melatonin treatment significantly improved nerve regeneration and function in rats with facial nerve crush injuries. These findings suggest melatonin may hold clinical potential for treating facial nerve damage.
Area of Science:
- Neuroscience
- Regenerative Medicine
Background:
- Facial nerve injuries pose significant management challenges.
- Melatonin is recognized for its neuroregenerative properties.
Purpose of the Study:
- To evaluate the efficacy of systemic melatonin in promoting nerve regeneration following facial nerve crush injury.
- To quantify the regenerative potential of melatonin in an animal model.
Main Methods:
- A double-blind, randomized, controlled study involving 24 rats with facial nerve crush injury.
- Three groups received either 5 mg/kg/day melatonin, 20 mg/kg/day melatonin, or a carrier solution (control) via intraperitoneal injection for 28 days.
- Primary outcomes included histomorphometric analysis (axonal and Schwann cell density) and secondary outcomes involved facial nerve activity assessed by EMG and functional tests.
Main Results:
- Histomorphometric analysis showed significantly higher mean axonal density in both melatonin treatment groups (5 mg/kg and 20 mg/kg) compared to the control group.
- Electromyography (EMG) revealed increased amplitude and decreased duration in melatonin-treated groups, indicating improved nerve activity.
- Functional assessments demonstrated statistically significant improvements in whisking amplitude in both melatonin treatment groups compared to controls.
Conclusions:
- Supraphysiological doses of systemic melatonin enhance nerve regeneration and functional recovery after facial nerve crush injury in an animal model.
- The study supports further investigation into the clinical application of melatonin for facial nerve regeneration.
