کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8998179 1115605 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Imidazenil: An antagonist of the sedative but not the anticonvulsant action of diazepam
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
پیش نمایش صفحه اول مقاله
Imidazenil: An antagonist of the sedative but not the anticonvulsant action of diazepam
چکیده انگلیسی
Flumazenil (FLU), a specific benzodiazepine (BZ) receptor antagonist has been used in the treatment of acute BZ intoxication or the alleviation of BZ-induced withdrawal syndrome on the basis of its weak partial agonist action at GABAA receptors. However, given to patients, FLU can worsen diazepam-induced withdrawal syndrome by lowering seizure threshold. We therefore investigated whether imidazenil, a selective positive allosteric modulator of GABA action at GABAA receptors containing α5 subunit, can antagonize diazepam-induced sedative action and suppression of locomotor activity without affecting diazepam anti-bicuculline action. We report here that while FLU (16.5 μmol/kg) showed no effect on locomotor activity and bicuculline-induced convulsion, it completely antagonized diazepam (10.5 μmol/kg) anti-bicuculline action and the suppression of locomotor activity. However, imidazenil (0.76 μmol/kg) elicited anti-bicuculline action and was dose-dependently antagonized by FLU (16.5 and 33 μmol/kg). Furthermore, imidazenil showed no effect on path length traveled but slightly decreased (40%) horizontal activity when compared to diazepam (85%), and maintained the anti-bicuculline action of diazepam to a threshold level similar to that observed with diazepam. Whereas cross-tolerance between BZs has been reported in animals and humans, we previously reported the absence of cross-tolerance between imidazenil and diazepam. Thus, we suggest that imidazenil might be more effective than FLU at alleviating the withdrawal syndrome associated with long-term BZ administration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuropharmacology - Volume 49, Issue 3, September 2005, Pages 425-429
نویسندگان
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