title: Evidence for multiple muscarinic receptor subtypes in human brain.
abstract: Pirenzepine, a compound with selective antimuscarinic activity, was used to distinguish muscarinic acetylcholine receptor subtypes in normal human brain. Hill coefficients and IC50 values derived from the inhibition of specific [3H]L-quinuclidinyl benzilate receptor binding suggest the presence of two muscarinic binding sites, differing both in affinity for pirenzepine and in tissue distribution.
mesh_terms: D000679:Amygdala / Q000378:metabolism; D001285:Atropine / Q000494:pharmacology; D001570:Benzodiazepinones / Q000494:pharmacology; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism*; D002540:Cerebral Cortex / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D010276:Parasympatholytics / Q000494:pharmacology; D010890:Pirenzepine; D011149:Pons / Q000378:metabolism; D011813:Quinuclidinyl Benzilate / Q000378:metabolism; D011976:Receptors, Muscarinic / Q000378:metabolism*; D014018:Tissue Distribution
chemical_list: D001570:Benzodiazepinones; D010276:Parasympatholytics; D011976:Receptors, Muscarinic; D010890:Pirenzepine; D011813:Quinuclidinyl Benzilate; D001285:Atropine