A subclass of GABAA/benzodiazepine receptor exclusively localized in the limbic system.
Neuroreport
; 8(1): 117-22, 1996 Dec 20.
Article
em En
| MEDLINE
| ID: mdl-9051764
ABSTRACT
An in vivo saturation study using 11C-labelled Ro15-4513 with high specific radioactivity (> 70 GBq mumol-1) revealed the presence of very high-affinity and high-affinity binding sites (Kd values in the amygdala approximately 0.4 and 18.7 nM, respectively) in the gamma-aminobutyric acid type A/benzodiazepine (GABAA/BZ) receptor in the living monkey brain. Subtraction of an image obtained using [11C]Ro15-4513 with low specific radioactivity from an image obtained by that with high specific radioactivity, both of which were scanned with a high spatial resolution positron emission tomography camera, demonstrated that the very high-affinity sites are exclusively localized in the limbic system, such as in the amygdala, hippocampus, anterior cingulate, septum, nucleus accumbens and insular cortex. The localization of the very high-affinity binding sites, which may be derived from a subclass of central GABAA/BZ receptors, might account for the anxiolytic effect of BZ analogues.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Receptores de GABA-A
/
Sistema Límbico
Limite:
Animals
Idioma:
En
Ano de publicação:
1996
Tipo de documento:
Article