2-Amino-5-phosphonopentanoic acid (100 and 200 mg/kg) and 2-amino-7-phosphonoheptanoic acid (50-200 mg/kg i.p.) significantly elevated the threshold for maximal electroconvulsions in mice, the latter being more effective in this respect. In contrast, neither alpha-aminoadipic acid nor L-glutamic acid diethyl ester (up to 200 and 400 mg/kg, respectively) offered any protection. The present results add further evidence to support the importance of the blockade of N-methyl-D-aspartic acid receptor-mediated events in the suppression of seizure activity.
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