Abstract
Using the isoquinoline carboxamide derivative, PK 11195 as selective ligand, the binding properties of peripheral benzodiazepine binding sites were compared on platelets of alcoholics and non-alcoholic, healthy controls. When compared to controls, alcoholics during prolonged ethanol consumption show a significant reduction in the density of platelet [ 3H]PK 11195 binding sites. However, following abstention from alcohol, the density of these sites is similar to controls. These data suggest that a reduction in the density of peripheral benzodiazepine binding sites on platelets may be a biochemical index of prolonged ethanol use and indicate a possible role for these sites in mediating the chronic effects of alcohol.
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