Abstract
R05-4864 decreased in a dose-dependent manner, from 3 × 10 −9 M to 3 × 10 −6 M, the duration of intracellular action potential and the contractility in a guinea pig preparation. Diazepam was less effective and clonazepam inactive. The effects of R05-4864 were GABA-independent and antagonized by PK 11195 but not by the selective antagonist of the brain type benzodiazepine receptors R015-1788. These results show the pharmacological relevance of peripheral type benzodiazepine binding sites at the cardiac level.
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