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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Löscher, W. Potschka, H. Treiber, H. J. Behl, B. Wlaz, P. Szabo, L. Hofmann, H. P. |
| Description | Author Affiliation: Potschka H ( Department of Pharmacology, Toxicology and Pharmacy, School of Veterinary Medicine, Hannover, Germany.) |
| Abstract | The aim of this study was to assess whether a drug which combines an antagonistic action at both NMDA and non-NMDA receptors offers advantages for treatment of epileptic seizures compared to drugs which antagonize only one of these ionotropic glutamate receptors. The novel glutamate receptor antagonist LU 73068 (4,5-dihydro-1-methyl-4-oxo-7-trifluoromethylimidazo[1,2a]quinoxal ine-2-carbonic acid) binds with high affinity to both the glycine site of the NMDA receptor (Ki 185 nM) and to the AMPA receptor (Ki 158 nM). Furthermore, binding experiments with recombinant kainate receptor subunits showed that LU 73068 binds to several of these subunits, particularly to rGluR7 (Ki 104 nM) and rGluR5 (Ki 271 nM). In comparison, the prototype non-NMDA receptor antagonist NBQX (2,3-dihydroxy-6-nitro-7-sulphamoyl-benzo[f]quinoxaline) binds with high affinity to AMPA receptors only. Both NBQX and LU 73068 were about equieffective after i.p. injection in mice to block lethal convulsions induced by AMPA or NMDA. In the rat amygdala kindling model of temporal lobe epilepsy, LU 73068 dose-dependently increased the focal seizure threshold (afterdischarge threshold, ADT). When rats were stimulated with a current 20% above the individual control ADT, LU 73068 completely blocked seizures with an ED50 of 4.9 mg kg(-1). Up to 20 mg kg(-1), only moderate adverse effects, e.g. slight ataxia, were observed. NBQX, 10 mg kg(-1), and the glycine/NMDA site antagonist L-701,324 (7-chloro-4-hydroxy-3-(3-phenoxy)phenyl-quinoline-2(1H)one), 2.5 or 5 mg kg(-1), exerted no anticonvulsant effects in kindled rats when administered alone, but combined treatment with both drugs resulted in a significant ADT increase. The data indicate that combination of glycine/NMDA and non-NMDA receptor antagonism in a single drug is an effective means of developing a potent and effective anticonvulsant agent. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 6 |
| Volume Number | 125 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 1998-11-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Anticonvulsants Pharmacology Epilepsy Drug Therapy Excitatory Amino Acid Antagonists Imidazoles Quinolones Quinoxalines Receptors, Glycine Antagonists & Inhibitors Receptors, N-Methyl-D-Aspartate Animals Metabolism Disease Models, Animal Dizocilpine Maleate Drug Synergism Excitatory Amino Acid Agonists Toxicity Adverse Effects Kindling, Neurologic Mice Mice, Inbred Strains N-Methylaspartate Receptors, AMPA Tritium Alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid Comparative Study Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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