title: Synthesis and study of thiocarbonate derivatives of choline as potential inhibitors of acetylcholinesterase.
abstract: Fourteen alkyl and aryl thiocarbonate derivatives of choline were synthesized and studied as potential inhibitors of acetylcholinesterase (AChE). Twelve of the compounds inhibited AChEs derived from calf forebrain, human red blood cells, and octopus brain ranging from low to moderately high inhibition potency. The concentration of each inhibitory compound giving 50% inhibition of enzyme activity (IC50 values, which ranged from 1 x 10(-2) to 8 x 10(-7) M) was determined and is reported; inhibitor constants (Ki values) for the most inhibitory compounds, (1-pentylthiocarbonyl)choline chloride and (1-heptylthiocarbonyl)choline chloride, were calculated from kinetic data and are also reported. The inhibitors are competitive with substrate, and they are not hydrolyzed by the AChE activities. Certain of these new compounds may provide direction for the development of new drugs that have anticholinesterase activity and may be used for the treatment of Alzheimer's disease.
authors.affiliation: Department of Biological Sciences, University of North Texas, Denton 76203, USA.
authors.forename: N A
authors.initials: NA
authors.lastname: Boyle
authors.forename: V
authors.initials: V
authors.lastname: Talesa
authors.forename: E
authors.initials: E
authors.lastname: Giovannini
authors.forename: G
authors.initials: G
authors.lastname: Rosi
authors.forename: S J
authors.initials: SJ
authors.lastname: Norton
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism*; D000818:Animals; D002254:Carbonates / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002417:Cattle; D002794:Choline / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002800:Cholinesterase Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D004912:Erythrocytes / Q000201:enzymology; D006801:Humans; D007202:Indicators and Reagents; D007700:Kinetics; D049831:Octopodiformes; D016548:Prosencephalon / Q000201:enzymology; D013329:Structure-Activity Relationship
chemical_list: D002254:Carbonates; D002800:Cholinesterase Inhibitors; D007202:Indicators and Reagents; D000110:Acetylcholinesterase; D002794:Choline