Related Experiment Video
Updated: May 13, 2026
The Use of Trace Eyeblink Classical Conditioning to Assess Hippocampal Dysfunction in a Rat Model of Fetal Alcohol Spectrum Disorders
Published on: August 5, 2017
Role of Oxidative Stress in Ethanol-induced Neurotoxicity in the Developing Cerebellum
Azam Ramezani1, Iran Goudarzi, Taghi Lashkarboluki
1Faculty of Biology, Damghan University, Damghan, Iran.
Insights
Ethanol exposure in young rats increases lipid peroxidation and decreases glutathione peroxidase activity, leading to Purkinje cell loss in the cerebellum. This study highlights oxidative stress as a key factor in ethanol-induced neurotoxicity.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- Ethanol exposure during early development poses significant risks to the central nervous system.
- Purkinje cells are particularly vulnerable to neurotoxic insults.
- Oxidative stress is implicated in various neurodegenerative processes.
Purpose of the Study:
- To investigate the role of oxidative stress in ethanol-induced neurotoxicity of Purkinje cells in rat pups.
- To assess the impact of ethanol on antioxidant enzyme activity and lipid peroxidation in the cerebellum.
Main Methods:
- Ethanol (6 g/kg) was administered to 4-day-old rat pups on postnatal days 4 and 5.
- Cerebellar tissues were analyzed for antioxidant enzyme activities (SOD, CAT, GPx) and lipid peroxidation (TBARS).
- Histological examination of Purkinje cells was performed.
Main Results:
- Ethanol administration significantly increased TBARS levels, indicating enhanced lipid peroxidation.
- A significant decrease in glutathione peroxidase (GPx) activity was observed in ethanol-treated pups.
- Histological analysis revealed Purkinje cell loss and shrinkage in ethanol-exposed rats.
Conclusions:
- Ethanol exposure during a critical developmental window increases oxidative stress and causes Purkinje cell loss.
- Reduced GPx activity and increased lipid peroxidation contribute to ethanol-induced cerebellar neurotoxicity.
- These findings underscore the detrimental effects of early-life ethanol exposure on cerebellar development.
Objective(S):
The purpose of this study was to investigate the role of oxidative stress in Purkinje cell neurotoxicity of ethanol-treated rat.
Materials And Methods:
Male rat pups 4-day-old was used in this study. Ethanol was administered to rat pups at a dose of 6 g/kg from postnatal days (PDs) 4 to 5. Pups were killed 90 min after the second alcohol treatment on PD 5 by decapitation and the brain was immediately removed. The cerebellum was dissected for analyzing the oxidative stress parameters and histological study. The activities of several antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) in vermis of cerebellum were assayed. Thiobarbituric acid reactive substances (TBARS) levels were also measured as a marker of lipid peroxidation.
Results:
Administration of ethanol significantly increased TBARS levels in the cerebellum compared to control pups (P< 0.01). The treated pups with ethanol exhibited a marked decrease in the GPx activity (P< 0.01) whereas, in spite of decrease in the activities of SOD and CAT, when compared to control, there were not significant differences. The spherical cell bodies of Purkinje cells in control rats are aligned nicely between the granular and molecular layers. In ethanol treated pups, Purkinje cells scattered within the Purkinje cell layer and shrinkage of the cell somata is seen.
Conclusion:
The results of the present work demonstrated that ethanol exposure during the vulnerable window could increase TBARS levels (lipid peroxidation) and decrease GPx levels in pup's cerebellum. Also, the results confirmed ethanol-induced microencephaly, cerebellar Purkinje cell loss. These findings suggest that Purkinje cell loss is, in part through decrease in the activity of GPx and increase of lipid peroxidation in the rat cerebellum.
