Abstract
To understand the properties of benzodiazepine receptor in the neostriatum, we examined the potentiating effects of diazepam, triazolam and brotizolam on the GABA(A) receptor-mediated Cl- current in dissociated rat neostriatal neurones using the nystatin-perforated patch recording configuration. Neurones were classified into large and small neurones, on their somatic size. In the large neurones, which are putative cholinergic interneurones, all the benzodiazepine receptor agonists recognized a single effective site. However, in the small neurones, which are mostly considered to be projecting neurones, the effect of brotizolam was best described when two effective sites were assumed. Therefore, the properties of benzodiazepine receptor differed among large and small neurones while at least two kinds of functional binding sites were also found to exist in small neurones.
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