Antagonism of convulsions but failure to enhance GABA(A) receptor function by felbamate in mice tolerant to diazepam

Autor:	M, Serra, R, Cuccu, C A, Ghiani, M G, Pisu, A, Murgia, G, Biggio
Rok vydání:	1997
Předmět:	Male Diazepam Time Factors Drug Evaluation Preclinical Phenylcarbamates Down-Regulation Drug Tolerance Kynurenic Acid Receptors GABA-A Felbamate Rats Rats Sprague-Dawley Mice Propylene Glycols Isoniazid Animals Anticonvulsants GABA Modulators Excitatory Amino Acid Antagonists
Zdroj:	Neurochemical research. 22(6)
ISSN:	0364-3190
Popis:	The transfer of tolerance between drugs may indicate a common mode of action. The development of cross-tolerance to the anticonvulsant effect of felbamate after long-term treatment of mice with diazepam, a positive modulator of gamma-aminobutyric acid (GABA)-mediated transmission, was therefore studied in order to clarify the mechanism of this action of felbamate. A challenge injection of felbamate, administered 36 h after the last dose of chronic diazepam treatment, antagonized convulsions elicited by administration of isoniazid. In contrast, felbamate had no effect on the isoniazid-induced increase in t-[35S]butylbicyclophosphorothionate binding to cerebral cortical membranes of diazepam-tolerant mice. These results suggest that the action of felbamate on GABAergic transmission is not required for the anticonvulsant effect of this drug. This conclusion is consistent with studies that have indicated that the antiepileptic activity of felbamate depends on its modulatory activity at excitatory amino acid receptors.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid________::98028ae9f4c9f3a57d00103282e59aff https://pubmed.ncbi.nlm.nih.gov/9178952 Zobrazit plný text záznamu Full text from SpringerLink