Apparent antinociceptive and anti-inflammatory effects of GYKI 52466.
Eur J Pharmacol
; 336(2-3): 143-54, 1997 Oct 08.
Article
em En
| MEDLINE
| ID: mdl-9384226
ABSTRACT
GYKI 52466 (1-(4-aminophenyl)-4-methyl-7,8-methylenedioxy-5H-2,3-benzodiazepine) was examined in a battery of analgesia and anti-inflammatory tests in rats and mice, respectively. Its 3-N-acetyl (GYKI 53773) and 3-N-methylcarbamoyl (GYKI 53784) derivatives were also examined in some assays. These 2,3-benzodiazepines, known as prototypic non-competitive antagonists of AMPA receptors, showed a peculiar profile in some routinely used antinociceptive tests. They were found fairly potent in rat tail flick and mouse phenylquinone writhing assays but the dose-response curves were rather shallow as compared to that of morphine. Their action is stereoselective, i.e., the (+) isomers were found inactive, in agreement with the previous in vitro studies. Their antinociceptive effect could not be reversed by naloxone and the GYKI compounds did not potentiate significantly the morphine-induced analgesia. In the mouse hot plate assay the 2,3-benzodiazepines were active only in doses inducing visible motor incapacitation. In rats, GYKI 52466 weakly reduced the hypersensitivity accompanying acute carrageenan edema. However, it potently inhibited the hyperalgesia during Freund adjuvant-induced chronic arthritis. In the latter assay GYKI 52466 also attenuated the body weight loss without altering the paw edema. The present findings confirm reports in the literature which indicate AMPA receptors may contribute to certain forms of pathological hyperalgesia, e.g., to that detectable in inflamed tissues.
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Bases de dados:
MEDLINE
Assunto principal:
Artrite Experimental
/
Ansiolíticos
/
Benzodiazepinas
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Antagonistas de Aminoácidos Excitatórios
/
Analgésicos
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Anti-Inflamatórios
Limite:
Animals
Idioma:
En
Revista:
Eur J Pharmacol
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Hungria