title: Suppression of audiogenic seizures in DBA/2 mice by two new dipeptide NMDA receptor antagonists.
abstract: Two new phosphonate dipeptides, gamma-D- glutamylaminomethylphosphonate (Glu-Amp) and beta-D- aspartylaminomethylphosphonate (Asp-Amp), that are antagonists of excitation due to N-methyl-D-aspartate have been compared with omega-phosphonic-alpha-carboxylic amino acids as anticonvulsant agents in mice with sound-induced seizures. Compounds were injected intracerebroventricularly (i.c.v.) or intraperitoneally (i.p.) into DBA/2 mice 45 min prior to sound exposure, and ED50 values for suppression of the different phases of the seizure response were estimated. With i.c.v. injection Glu-Amp is 0.4-0.8 times as potent an anticonvulsant as (+/-)2-amino-7- phosphonoheptanoate and Asp-Amp is 1.3-2.5 times as potent. With i.p. injection Glu-Amp is 0.15-0.28 and Asp-Amp 0.23-0.58 times as potent as (+/-)2-amino-7-phosphonoheptanoic acid. These findings correspond to their known potency as N-methyl-D-aspartate antagonists, and are consistent with an anticonvulsant effect arising from action at a receptor sensitive to N-methyl-D-aspartate.
mesh_terms: D015763:2-Amino-5-phosphonovalerate / Q000031:analogs & derivatives; D000161:Acoustic Stimulation; D000596:Amino Acids / Q000494:pharmacology; D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology*; D001224:Aspartic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D004151:Dipeptides / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005971:Glutamates / Q000494:pharmacology*; D005973:Glutamine / Q000031:analogs & derivatives*; D051379:Mice; D008811:Mice, Inbred DBA; D012640:Seizures / Q000188:drug therapy*; D014633:Valine / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D000927:Anticonvulsants; D004151:Dipeptides; D005971:Glutamates; D005973:Glutamine; D001224:Aspartic Acid; D015763:2-Amino-5-phosphonovalerate; C041656:gamma-D-glutamylaminomethylphosphonic acid; C041657:beta-D-aspartylaminomethylphosphonic acid; D014633:Valine; C031231:2-amino-7-phosphonoheptanoic acid