| Abstract: | An intraventricular pulse of 14COOH]L-methionine to mice pretreated with the convulsant L-methionine-dl-sulfoximine (MSO) resulted in significantly higher than control specific radioactivity values of cerebral 14COOH]L-methionine (Met), 14COOH]S-adenosyl-L-methionine (AdoMet) and 14COOH]S-adenosyl-L-homocysteine (AdoHcy). MSO administration (3 hr) also decreased brain steady-state levels of Met, AdoMet, and AdoHcy. Following an intraventricular pulse of 3H-methyl]L-methionine, the levels of 3H-methyl]phosphatidylmonomethylethanolamine and of membrane associated and soluble 3H-methyl]carboxylmethylated proteins were increased over corresponding saline-treated controls. The activity of cerebral histamine N-methyltransferase was also increased after MSO treatment. The administration of a combination of adenosine and homocysteine thiolactone to MSO-pretreated animals counteracted the MSO-induced decreases in brain Met, AdoMet, and AdoHcy as well as the increase in histamine N-methyltransferase activity. In addition, administration of adenosine together with homocysteine thiolactone decreased the incidence of, and increased the latency to MSO seizures, with the most effective anticonvulsant action occurring when cerebral AdoHcy levels were at their highest. |
