title: Does the reversal of the anticonflict effect of phenobarbital by beta-CCE and FG 7142 indicate benzodiazepine receptor-mediated anxiogenic properties?
abstract: In mice and rats, the high affinity ligand for brain benzodiazepine (BZ) receptors beta-CCE, and the more stable congener FG 7142, failed to exert anticonflict activity in conflict situations but instead reversed the anticonflict effect of lorazepam. In contrast to Ro 15-1788, beta-CCE and FG 7142 also antagonized the anticonflict effect of phenobarbital in rats. This effect suggests that beta-CCE and FG 7142 may produce anxiety by either inducing a conformational change in the BZ receptors which is directly opposite to that induced by the benzodiazepines, or binding to a particular subclass of BZ receptors.
mesh_terms: D000818:Animals; D001007:Anxiety / Q000503:physiopathology*; D002243:Carbolines / Q000494:pharmacology*; D003220:Conflict, Psychological / Q000187:drug effects*; D003975:Diazepam / Q000494:pharmacology; D005445:Flunitrazepam / Q000378:metabolism; D006801:Humans; D007211:Indoles / Q000494:pharmacology*; D008297:Male; D010634:Phenobarbital / Q000037:antagonists & inhibitors*; D011678:Punishment; D051381:Rats; D011919:Rats, Inbred Strains; D011955:Receptors, Drug / Q000378:metabolism*; D011963:Receptors, GABA-A
chemical_list: D002243:Carbolines; D007211:Indoles; D011955:Receptors, Drug; D011963:Receptors, GABA-A; C035874:FG 7142; D005445:Flunitrazepam; C024915:beta-carboline-3-carboxylic acid ethyl ester; D003975:Diazepam; D010634:Phenobarbital