Abstract:
:We compared the modulation of GABA (gamma-aminobutyric acid)-activated currents by benzodiazepines in recombinant GABAA receptors containing either one of two alpha subunits, alpha 1 or alpha 6. Lüddens et al. (Nature, 346 (1990) 648-651) have previously demonstrated that the alpha 6 subunit is part of a cerebellar receptor subtype which selectively binds Ro15-4513, an antagonist of alcohol-induced motor ataxia. Here we report that the imidazobenzodiazepine Ro15-4513 (ethyl 8-azido-5,6-dihydro-5-methyl-6-oxo-4H-imidazo-(1,5-a) (1,4)benzodiazepine-3-carboxylate) reduced GABA-activated currents in recombinant alpha 6 beta 2 gamma 2 and alpha 1 beta 2 gamma 2 receptors, thus acting consistently as an inverse agonist. Moreover, another well characterized negative modulator, DMCM (methyl-4-ethyl-6,7-dimethoxy-beta-carboline-3-carboxylate), also reduces GABA activated-currents in both receptors. In contrast, flunitrazepam (FNZM), a benzodiazepine agonist, increases GABA-activated currents in alpha 1 beta 2 gamma 2 receptors, but not in alpha 6 beta 2 gamma 2 receptors. This study lends further support to the hypothesis that the binding sites of full and partial inverse agonists are different.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Kleingoor C,Ewert M,von Blankenfeld G,Seeburg PH,Kettenmann Hdoi
10.1016/0304-3940(91)90389-bsubject
Has Abstractpub_date
1991-09-16 00:00:00pages
169-72issue
2eissn
0304-3940issn
1872-7972pii
0304-3940(91)90389-Bjournal_volume
130pub_type
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