In vivo binding of [11C]nemonapride to sigma receptors in the cortex and cerebellum.

Abstract:

:Radiolabeled nemonapride (NEM, YM-09151-2) is widely used as a representative dopamine D2-like receptor ligand in pharmacological and neurological studies, and 11C-labeled analog ([11C]NEM) has been developed for positron emission tomography (PET) studies. The aim of this study was to evaluate whether [11C]NEM binds in vivo to sigma receptors. [11C]NEM and one of six dopamine D2-like receptor ligands or seven sigma receptor ligands were co-injected into mice, and the regional brain uptake of [11C]NEM was measured by a tissue dissection method. The striatal uptake of [11C]NEM was reduced by D2-like receptor ligands, NEM, haloperidol, (+)-butaclamol, raclopride, and sulpiride, but not by a D4 receptor ligand clozapine. In the cortex and cerebellum the uptake was also reduced by D2-like receptor ligands with affinity for sigma receptors, but not by raclopride. Although none of seven sigma receptor ligands, SA6298, N,N-dipropyl-2-[4-methoxy-3-(2-phenylethoxy)phenyl]ethylamine hydrochloride (NE-100), (+)-pentazocine, R(-)-N-(3-phenyl-1-propyl)-1-phenyl-2-aminopropane hydrochloride ([-]-PPAP), (-)-pentazocine, R(+)-3-(3-hydroxyphenyl)-N-propylpiperidine hydrochloride ([+]-3-PPP), and (+)-N-allylnormetazocine hydrochloride ([+]-SKF 10047), blocked the striatal uptake, five of them with relatively higher affinity significantly reduced the [11C]NEM uptake by the cortex, and four of them reduced that by the cerebellum. We concluded that [11C]NEM binds in vivo not only to dopamine D2-like receptors in the striatum but also to sigma receptors in other regions such as cortex and cerebellum.

journal_name

Nucl Med Biol

authors

Ishiwata K,Senda M

doi

10.1016/s0969-8051(99)00033-5

keywords:

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

627-31

issue

6

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(99)00033-5

journal_volume

26

pub_type

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