title: Differential inhibition of brain specific [3H]flunitrazepam binding by several types of dyes.
abstract: Several dyes, representing different structural classes, inhibit [3H]flunitrazepam binding to brain specific receptors in the rat with 50% inhibition in the 1 to 100 microM range. Crystal Violet and Methyl Violet 2B inhibited more potently in the forebrain than in the cerebellum. Congo Red yielded a Hill number near 2.3, probably reflecting positive cooperativity between interacting binding sites in benzodiazepine receptor complexes. Toluidine Blue 0 was the most potent of the dyes tested (IC50 = 1 microM in cerebellum) and inhibited more potently in cerebellum than in forebrain.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D004396:Coloring Agents / Q000494:pharmacology*; D003224:Congo Red / Q000494:pharmacology; D005445:Flunitrazepam / Q000378:metabolism*; D005840:Gentian Violet / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D014316:Tritium
chemical_list: D004396:Coloring Agents; D014316:Tritium; D003224:Congo Red; D005445:Flunitrazepam; D005840:Gentian Violet