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Brain methylation and epileptogenesis: the case of methionine sulfoximine
Abstract:
A brief review of the neurochemical effects of the convulsant agent L-methionine-dl-sulfoximine (MSO) on cerebral methylation reactions is presented. Our findings point to the involvement of a number of endogenous methyl acceptor molecules, including histamine, membrane phospholipids, and membrane proteins, in the mediation of the convulsant effect. Our findings also associate the inhibition of methylations by high levels of S-adenosyl-L-homocysteine in brain with protection against MSO-induced seizures. We propose that MSO acts by eliciting the acceleration of a regulatory methylation-demethylation sequence at key molecular sites, including the benzodiazepine receptor complex, which creates an imbalance in this sequence's normal mediation of convulsant-anticonvulsant mechanisms.
Insights
L-methionine-dl-sulfoximine (MSO) causes seizures by disrupting brain methylation processes. High S-adenosyl-L-homocysteine levels protect against MSO-induced seizures by inhibiting these reactions.
Area of Science:
- Neurochemistry
- Molecular Biology
- Pharmacology
Background:
- Cerebral methylation reactions are crucial for normal brain function.
- Convulsant agents can disrupt these vital processes.
- Understanding the neurochemical basis of seizures is essential for developing treatments.
Purpose of the Study:
- To review the neurochemical effects of L-methionine-dl-sulfoximine (MSO) on cerebral methylation.
- To identify endogenous molecules involved in MSO-induced convulsant effects.
- To explore the role of S-adenosyl-L-homocysteine in MSO-induced seizures.
Main Methods:
- Review of existing literature on MSO's neurochemical effects.
- Analysis of endogenous methyl acceptor molecules.
- Investigation of S-adenosyl-L-homocysteine levels in relation to MSO-induced seizures.
Main Results:
- MSO's convulsant effects involve endogenous methyl acceptors like histamine, phospholipids, and proteins.
- High brain S-adenosyl-L-homocysteine levels inhibit methylation and protect against MSO-induced seizures.
- MSO accelerates methylation-demethylation sequences at sites including the benzodiazepine receptor complex.
Conclusions:
- MSO disrupts cerebral methylation, leading to seizures.
- Imbalance in methylation-demethylation sequences, particularly at the benzodiazepine receptor complex, underlies MSO's convulsant action.
- S-adenosyl-L-homocysteine plays a protective role by inhibiting methylation.