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Enhancement of brain kynurenic acid production by anticonvulsants--novel mechanism of antiepileptic activity?

Abstract：

:In this study, we describe the effect of antiepileptic drugs on the production of kynurenic acid in rat cortical slices, and on the activity of kynurenic acid biosynthetic enzymes, kynurenine aminotransferases (KATs I and II) in the brain tissue. Phenobarbital, felbamate, phenytoin and lamotrigine (all at 0.5-3.0 mM) enhanced kynurenic acid production in vitro, and stimulated the activity of KAT I. In contrast, vigabatrin, gabapentin and tiagabine inhibited kynurenic acid synthesis in cortical slices with IC(50) of 3.9 (2.8-7.9), 3.7 (2.5-5.4) and 7.5 (3.5-14.3) mM, respectively. Vigabatrin, gabapentin and tiagabine reduced also the activity of KAT I with IC(50) of 1.6 (1.1-2.4), 0.1 (0.01-0.15), 0.9 (0.7-1.2) mM, and the activity of KAT II with IC(50) values of 6.0 (4.8-7.5), 0.2 (0.1-0.3) and 2.0 (1.5-2.6) mM, respectively. In conclusion, the enhancement of kynurenic acid formation displayed by carbamazepine, phenytoin, phenobarbital, felbamate and lamotrigine seems to be a novel mechanism, synergistic with other actions of these drugs, and potentially valuable in terms of better control of epilepsy.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Kocki T,Wielosz M,Turski WA,Urbanska EM

doi

10.1016/j.ejphar.2006.05.015

subject

Has Abstract

pub_date

2006-07-17 00:00:00

pages

147-51

issue

3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(06)00503-6

journal_volume

541

pub_type

杂志文章

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