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Neuropharmacology

Benzodiazepine receptor modulation of [35S]TBPS binding to the chloride channel. Noncompetitive inhibition of classical benzodiazepines and competitive inhibition of the partial agonist, CGS 9895, by CGS 8216.


PMID 2442653

Abstract

Benzodiazepine receptor ligands are known to modulate the binding of [35S]TBPS to the chloride channel via an allosteric action. In the cases of diazepam, zopiclone and CGS 9895, the enhanced binding of [35S]TBPS induced by these benzodiazepine agonists was antagonized by CGS 8216. This antagonism was characterized both by a shift to the right and a decrease in the maximal stimulation, for the dose-response curves of diazepam and zopiclone. In the case of CGS 9895, the maximal response was not decreased. These data indicate that CGS 8216 is a noncompetitive antagonist of classical benzodiazepine receptor agonists but is a competitive inhibitor of the partial agonist, CGS 9895.

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