Abstract
The interaction of seven penicillin derivatives with specific [3H]flunitrazepam binding to benzodiazepine receptors was investigated. The affinities of the penicillins for benzodiazepine receptor seemed to depend on the lipophilia of the derivatives. The concentrations of the penicillins which inhibit specific [3H]flunitrazepam binding are consistent with penicillin levels found in the central nervous system of patients developing penicillin induced convulsions. The results suggest that penicillins inhibit GABAergic transmission not only at the GABA receptor, but also at the benzodiazepine receptor, which is thought to be part of a neuronal system facilitating GABAergic transmission. Both mechanisms may account at least in part for the convulsive not neurotoxic properties of penicillins.
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