摘要:
In Alzheimer's disease, cerebral cortical butyrylcholinesterase (BChE) activity is reported to be elevated. Our aim was to develop a novel F-18-labeled tracer for quantifying cerebral BChE activity by positron emission tomography. With in vitro screening of N-[C-14]ethylpiperidin-3- and 4-ylmethyl esters, N-[C-14]ethylpiperidin-4-ylmethyl butyrate was selected as a lead for F-18-labeling, affording N-[F-18]fluoroethylpiperidin-4-ylmethyl butyrate. The F-18-labeled butyrate showed the required properties for in vivo BChE measurement, that is, the lipophilic nature of the authentic ester, high specificity to B3ChE, a moderate hydrolysis rate, and the hydrophilic nature of the metabolite. (C) 2004 Elsevier Ltd. All rights reserved.