In vitro characterization of 6-[18F]fluoro-A85380, a high-affinity ligand for α4β2*nicotinic acetylcholine receptors

被引：20

作者：

Gündisch, D ^{[1
]}

Koren, AO ^{[1
]}

Horti, AG ^{[1
]}

Pavlova, OA ^{[1
]}

Kimes, AS ^{[1
]}

Mukhin, AG ^{[1
]}

London, ED ^{[1
]}

机构：

[1] Natl Inst Drug Abuse, Neuroimaging Res Branch, NIH, DHHS,Intramural Res Program, Baltimore, MD 21224 USA

来源：

SYNAPSE | 2005年 / 55卷 / 02期

关键词：

6-[F-18]fluoro-A-85380; nicotine; epibatidine; cytisine; receptor binding; nicotinic acetylcholine receptor;

D O I：

10.1002/syn.20096

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

Nicotinic acetylcholine receptors are involved in tobacco dependence and several other neuropathologies (e.g., Alzheimer's disease, Parkinson's disease), as well as in attention, learning, and memory. Performing in vivo imaging of these receptors in humans holds great promise for understanding their role in these conditions. Recently, three radiohalogenated analogs of 3-(2(S)-azetidinylmethoxy)pyridine (A-85380) were used successfully for the in vivo visualization of alpha4beta2* nicotinic receptors in the human brain with PET/SPECT. Herein, we present the results of the in vitro characterization of one of these radioligands, 6-[F-18]fluoro-3-(2(S)-azetidinylmethoxy)-pyridine (6-[F-18]fluoro-A-85380), which is a fluoro-analog of the potent nonopioid analgesic ABT-594. In human postmortem cortical tissue, 6- [F-18]fluoro-A-85380 reversibly binds with high affinity to a single population of sites (K-d = 59 pM at 37degreesC, B-max = 0.7 pmol/g tissue). The binding is fully reversible and is characterized at 37degreesC by T-1/2assoc = 2.2 min (at a ligand concentration of 39 pM) and by T-1/2dissoc = 3.6 min. 6-Fluoro-A-85380 exhibits clear selectivity for alpha4beta2* over the other major mammalian nicotinic receptor subtypes: alpha7, alpha3beta4, and muscle-type. These results suggest that 6-[F-18]fluoro-A-85380 is a promising radioligand for in vivo imaging of brain alpha4beta2* nicotinic receptors. Published 2004 Wiley-Liss, Inc.

引用

页码：89 / 97

页数：9

共 56 条

[1] Broad-spectrum, non-opioid analgesic activity by selective modulation of neuronal nicotinic acetylcholine receptors [J].