These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Anticonvulsant, anxiolytic, and non-sedating actions of imidazenil and other imidazo-benzodiazepine carboxamide derivatives. Author: Auta J, Kadriu B, Giusti P, Costa E, Guidotti A. Journal: Pharmacol Biochem Behav; 2010 Jun; 95(4):383-9. PubMed ID: 20227434. Abstract: Recent evidence suggests that alpha1-containing GABA(A) receptors mediate the sedative, amnestic, and to some extent the anticonvulsant actions of non-selective benzodiazepine (BZ) receptor ligands, such as diazepam (DZ). Anxiolytic and in part, anticonvulsant actions of BZ ligands are mediated by alpha2-, alpha3-, and alpha5-containing GABA(A) receptors. This has resulted in increasing interest in developing BZ ligands with selective actions at GABA(A) receptors, including alpha2-, alpha3-, and alpha5-subunits, but devoid of efficacy at alpha1-containing receptors. To refine their spectrum of pharmacological actions, efforts are being made to minimize unwanted effects such as sedation, amnesia, and tolerance liabilities. A prototype for such BZ ligands is imidazenil (IMD), an imidazo-benzodiazepine carboxylic acid derivative that elicits potent anticonvulsant and anxiolytic actions at doses virtually devoid of sedative, cardio-respiratory depressant and amnestic effects, and anticonvulsant tolerance liability. To define the pharmacological profile of IMD and its derivatives, we compared the anticonflict (anxiolytic), anti-proconflict (antipanic), anti-bicuculline (BIC), and maximal electroshock seizure (MES) effects, and the suppression of locomotor activity by imidazo-benzodiazepine carboxylic acid derivatives to those of DZ and bretazenil (BTZ). We report here that IMD and one of its derivatives (RO 25-2775) possess dose-dependent anticonflict, anti-proconflict, and anti-BIC actions but failed to suppress locomotor activity. Like DZ, the other IMD derivatives (enazenil, RO 25-2776, and RO 25-2847) not only elicit dose-dependent anticonflict, anti-proconflict, anti-BIC, anti-MES effects but also suppress locomotor activity. In contrast, none of the IMD derivatives studied shows any similarity to BTZ, which elicits anticonflict, anti-proconflict actions and suppresses locomotor activity but is virtually inactive against BIC-induced tonic-clonic convulsions.[Abstract] [Full Text] [Related] [New Search]