title: Ketamine-induced anesthesia involves the N-methyl-D-aspartate receptor-channel complex in mice.
abstract: The role of the N-methyl-D-aspartate (NMDA) receptor-channel complex in ketamine-induced anesthesia was examined in mice. General anesthetic potencies were evaluated on a rating scale, which provided the data for anesthetic scores, loss of righting reflex, sleeping time and recovery time. All drugs were administered intraperitoneally. NMDA (60-300 mg/kg), an NMDA receptor agonist, dose-dependently antagonized the general anesthetic potencies of ketamine at a dose of 100 mg/kg which produced loss of righting reflex in more than 90% of the mice. On the other hand, a high dose of N-methyl-L-aspartate (400 mg/kg), a stereoisomer of NMDA, did not. A dose of 300 mg/kg of NMDA significantly shifted the dose-response curve of ketamine for loss of righting reflex to the right. A high dose of D-cycloserine (200 mg/kg), an agonist at the glycine site on the NMDA receptor complex, slightly but significantly shortened the sleeping time caused by ketamine (100 mg/kg). However, neither a critical subconvulsive dose of kainate (15 mg/kg), a kainate receptor agonist, nor a subconvulsive dose of quisqualate (120 mg/kg), an alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptor agonist, reversed general anesthesia induced by 100 mg/kg of ketamine.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D000596:Amino Acids / Q000502:physiology; D000768:Anesthesia, General; D000818:Animals; D001921:Brain / Q000378:metabolism; D004357:Drug Synergism; D007473:Ion Channels / Q000502:physiology*; D007649:Ketamine / Q000037:antagonists & inhibitors / Q000378:metabolism; D008297:Male; D051379:Mice; D016202:N-Methylaspartate / Q000037:antagonists & inhibitors / Q000378:metabolism*; D016194:Receptors, N-Methyl-D-Aspartate / Q000502:physiology*; D012018:Reflex / Q000187:drug effects; D013997:Time Factors
chemical_list: D000596:Amino Acids; D007473:Ion Channels; D016194:Receptors, N-Methyl-D-Aspartate; D016202:N-Methylaspartate; D007649:Ketamine