title: [3H]CL 218,872, a novel triazolopyridazine which labels the benzodiazepine receptors in rat brain.
abstract: We examined the specific binding of [3H]CL 218,872, a novel triazolopyridazine to benzodiazepine receptors in the rat cerebral cortex. Two binding sites with KD values of about 10-30 nM and 200-600 nM were demonstrated. A number of benzodiazepine anxiolytics inhibited [3H]CL 218,872 binding in a manner which correlates with the potency of these drugs for inhibiting [3H]benzodiazepine binding. Our initial studies show that [3H]CL 218,872 can label the benzodiazepine receptors and may prove to be a useful probe for studying benzodiazepine heterogeneity and regulation.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002540:Cerebral Cortex / Q000378:metabolism*; D066298:In Vitro Techniques; D008297:Male; D011724:Pyridazines / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011955:Receptors, Drug / Q000378:metabolism*; D011963:Receptors, GABA-A
chemical_list: D011724:Pyridazines; D011955:Receptors, Drug; D011963:Receptors, GABA-A; C021604:CL 218872