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Controlled Cortical Impact Model for Traumatic Brain Injury
Published on: August 5, 2014
Effect of melatonin on brain oxidative damage induced by traumatic brain injury in immature rats
1Department of Pediatrics, School of Medicine, Dokuz Eylul University, Inciralti, 35340, and Department of Neurosurgery, Ataturk Training and Research Hospital, Izmir, Turkey.
Insights
Melatonin, a potent antioxidant, protects immature rat brains from oxidative damage following traumatic brain injury (TBI). This study shows melatonin prevents increased lipid peroxidation, a key TBI mechanism, in young rodents.
Area of Science:
- Neuroscience
- Biochemistry
- Pediatric Medicine
Background:
- Traumatic brain injury (TBI) in children can lead to progressive oxidative damage.
- Lipid peroxidation, driven by free radicals, is a major contributor to secondary TBI.
- Antioxidant defenses may be compromised following pediatric head trauma.
Purpose of the Study:
- To investigate the protective effects of melatonin against oxidative brain damage in neonatal rats subjected to TBI.
- To assess the impact of melatonin on lipid peroxidation and antioxidant enzyme activity post-TBI.
Main Methods:
- Neonatal (7-day-old) rats were subjected to controlled contusion injury to model TBI.
- Thiobarbituric acid reactive substances (TBARS) levels were measured to assess lipid peroxidation.
- Activity of antioxidant enzymes, including superoxide dismutase (SOD) and glutathione peroxidase (GPx), was evaluated.
- Melatonin was administered as a single dose (5 mg/kg) to assess its neuroprotective effects.
Main Results:
- TBI significantly increased TBARS levels, indicating heightened lipid peroxidation in the immature brain.
- No compensatory increase in SOD or GPx activity was observed 24 hours post-TBI.
- Melatonin administration effectively prevented the TBI-induced increase in TBARS levels in both hemispheres.
Conclusions:
- Melatonin demonstrates significant neuroprotective effects against oxidative stress in the immature brain following TBI.
- Melatonin's potent free radical scavenging activity mitigates TBI-induced lipid peroxidation in neonatal rats.
- These findings suggest melatonin as a potential therapeutic agent for pediatric TBI.
Abstract:
Progressive compromise of antioxidant defenses and free radical-mediated lipid peroxidation, which is one of the major mechanisms of secondary traumatic brain injury (TBI), has also been reported in pediatric head trauma. In the present study, we aimed to demonstrate the effect of melatonin, which is a potent free radical scavenger, on brain oxidative damage in 7-day-old rat pups subjected to contusion injury. Whereas TBI significantly increased thiobarbituric acid reactive substances (TBARS) levels, there was no compensatory increase in the antioxidant enzymes such as superoxide dismutase (SOD) and glutathione peroxidase (GPx) 24 hours after TBI in 7-day-old rats. Melatonin administered as a single dose of 5 mg/kg prevented the increase in TBARS levels in both non-traumatized and traumatized brain hemispheres. In conclusion, melatonin protects against oxidative damage induced by TBI in the immature brain.
