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Synthesis and binding affinities of methylvesamicol analogs for the acetylcholine transporter and sigma receptor.

Abstract：

:We synthesized methylvesamicol analogs 13-16 and investigated the binding characteristics of 2-[4-phenylpiperidino]cyclohexanol (vesamicol) and methylvesamicol analogs 13-16, with a methyl group introduced into the 4-phenylpiperidine moiety, to sigma receptors (sigma-1, sigma-2) and to vesicular acetylcholine transporters (VAChT) in membranes of the rat brain and liver. In competitive inhibition studies, (-)-o-methylvesamicol [(-)-OMV] (13) (Ki=6.7 nM), as well as (-)-vesamicol (Ki=4.4 nM), had a high affinity for VAChT. (+)-p-Methylvesamicol [(+)-PMV] (16) (Ki=3.0 nM), as well as SA4503 (Ki=4.4 nM), reported as a sigma-1 mapping agent for positron emission tomography (PET), had a high affinity for the sigma-1 receptor. The binding affinity of (+)-PMV (16) for the sigma-1 receptor (Ki=3.0 nM) was about 13 times higher than that for the sigma-2 (sigma-2) receptor (Ki=40.7 nM). (+)-PMV (16) (Ki=199 nM) had a much lower affinity for VAChT than SA4503 (Ki=50.2 nM) and haloperidol (Ki=41.4 nM). These results showed that the binding characteristics of (-)-OMV (13) to VAChT were similar to those of (-)-vesamicol and that (+)-PMV (16) bound to the sigma-1 receptor with high affinity. In conclusion, (-)-OMV (13) and (+)-PMV (16), which had a suitable structure, with a methyl group for labeling with 11C, may become not only a new VAChT ligand and a new type of sigma receptor ligand, respectively, but may also become a new target compound of VAChT and the sigma-1 receptor radioligand for PET, respectively.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Shiba K,Ogawa K,Ishiwata K,Yajima K,Mori H

doi

10.1016/j.bmc.2005.11.044

subject

Has Abstract

pub_date

2006-04-15 00:00:00

pages

2620-6

issue

8

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(05)01131-4

journal_volume

14

pub_type

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