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Morphometric analysis of the synaptic alterations in an experimental epileptic model
Abstract:
Methionine sulphoximine (MSO) is a potent convulsant agent used in the study of experimental epilepsy. The changes of the synaptic endings were examined in the rat cerebral and cerebellar cortex, hippocampus and brainstem during MSO provoked convulsions. The alterations were analysed by morphometric methods. MSO was administered to adult male albino rats intraperitoneally in a dose of 600 mg/kg. The animals were sacrificed and tissue samples obtained 3, 6 and 12 hours following injection of the drug. Synaptic alteration appeared after the onset of epileptic convulsions. After the development of status epilepticus the changes became more expressed. A progressive swelling of the perisynaptic astrocyte processes could be observed. The synaptic terminals were swollen and the synaptic membranes thickened. The number of synaptic vesicles decreased, the vesicles had been crushed. The differences between the alterations of S and F type synapses are discussed.
Insights
Methionine sulphoximine (MSO) causes significant synaptic alterations in rat brains, including swelling and vesicle reduction, during induced epileptic convulsions. These changes worsen with the development of status epilepticus.
Area of Science:
- Neuroscience
- Pathology
- Pharmacology
Background:
- Methionine sulphoximine (MSO) is a convulsant agent utilized in experimental epilepsy research.
- Understanding MSO's effects on synaptic structures is crucial for epilepsy studies.
Purpose of the Study:
- To investigate the morphometric changes in synaptic endings within the rat brain during MSO-induced convulsions.
- To analyze alterations in the cerebral cortex, cerebellar cortex, hippocampus, and brainstem.
Main Methods:
- Adult male albino rats were administered MSO (600 mg/kg) intraperitoneally.
- Tissue samples were collected at 3, 6, and 12 hours post-injection for morphometric analysis.
- Focus was on synaptic alterations in specific brain regions.
Main Results:
- Synaptic alterations commenced after the onset of MSO-induced epileptic convulsions.
- Progressive swelling of perisynaptic astrocyte processes was observed.
- Synaptic terminals showed swelling, thickened membranes, decreased synaptic vesicles, and vesicle crushing, particularly after status epilepticus.
Conclusions:
- MSO provokes significant structural changes at the synaptic level in the rat brain.
- These alterations are time-dependent and intensify with the severity of epileptic activity.
- The study discusses differential effects on S and F type synapses.