D,L-(tetrazol-5-yl) glycine: a novel and highly potent NMDA receptor agonist.
This paper describes the pharmacological activity of D,L-(tetrazol-5-yl)glycine, a structurally novel and highly potent agonist at the N-methyl-D-aspartate (NMDA) subtype of excitatory amino acid receptor. D,L-(Tetrazol-5-yl)glycine potently displaced NMDA receptor binding to rat brain membranes as measured using [3H]CGS19755 (IC50 = 98 +/- 7 nM) and [3H]glutamate (IC50 = 36 +/- 18 nM) as ligands. D,L-(Tetrazol-5-yl)glycine did not appreciably inhibit the binding of D,L-alpha-[5-methyl-3H] amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA), [3H]kainate, or [3H]glycine (IC50s greater than 30,000 nM). D,L-(Tetrazol-5-yl)glycine was more potent than NMDA or cis-methanoglutamate as a depolarizing agent in the rat cortical slice, and unlike these other agents induced rapid receptor-mediated neurotoxicity. Depolarization by D,L-(tetrazol-5-yl)glycine was antagonized by LY233053, a selective NMDA receptor antagonist. D,L-(Tetrazol-5-yl)glycine was a highly potent convulsant when given to neonatal rats (ED50 = 0.071 mg/kg i.p.). Convulsions in neonatal rats or lethality in mice induced by D,L-(tetrazol-5-yl)glycine were selectively antagonized by competitive and non-competitive NMDA receptor antagonists. D,L-(Tetrazol-5-yl)glycine is a structurally novel (tetrazole-substituted) compound that is a highly potent and selective NMDA receptor agonist. D,L-(Tetrazol-5-yl)glycine could be used to probe further NMDA receptor function in vitro and in vivo.
Schoepp
D D
DD
Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285.
Smith
C L
CL
Lodge
D
D
Millar
J D
JD
Leander
J D
JD
Sacaan
A I
AI
Lunn
W H
WH
D000818:Animals; D001667:Binding, Competitive; D002540:Cerebral Cortex / Q000033:anatomy & histology / Q000187:drug effects; D005971:Glutamates / Q000378:metabolism; D018698:Glutamic Acid; D005998:Glycine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D007700:Kinetics; D008297:Male; D010875:Pipecolic Acids / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000502:physiology*; D012640:Seizures / Q000139:chemically induced; D013777:Tetrazoles / Q000378:metabolism / Q000494:pharmacology*; D014316:Tritium
D005971:Glutamates; D010875:Pipecolic Acids; D016194:Receptors, N-Methyl-D-Aspartate; D013777:Tetrazoles; D014316:Tritium; C073649:(tetrazol-5-yl)glycine; D018698:Glutamic Acid; C053672:selfotel; D005998:Glycine