Imaging of cholinergic terminals using the radiotracer [18F](+)‐4‐fluorobenzyltrozamicol: In vitro binding studies and positron emission tomography studies in nonhuman primates

Imaging of cholinergic terminals using the radiotracer [18F](+)‐4‐fluorobenzyltrozamicol: In vitro binding studies and positron emission tomography studies in nonhuman primates
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使用放射性示踪剂 [18F](+)-4-氟苄基三唑醇对胆碱能末端进行成像:非人灵长类动物的体外结合研究和正电子发射断层扫描研究

DOI:
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发表时间:
1997
期刊:
影响因子:
2.3
通讯作者:
T. Morton
T. Morton
中科院分区:
医学4区
文献类型:
--
作者:
R. Mach;M. Voytko;R. Ehrenkaufer;M. Nader;J. R. Tobin;S. Efange;S. Parsons;H. Gage;Cynthia R. Smith;T. Morton

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本组研究的目的是表征囊泡乙酰胆碱转运蛋白 (VAcChT) 放射性示踪剂 [18F](+)-4-氟苄基曲唑米考 ([18F](+)-FBT) 的体外结合特性和体内组织动力学。进行体外结合研究以确定 FBT 的 (+)- 和 (-)- 立体异构体对 VAcChT 以及 sigma(σ2 和 σ2)受体的亲和力。 (+)-FBT 对 VAcChT 具有高亲和力 (Ki = 0.22 nM),对 σ1 (21.6 nM) 和 σ2 (35.9 nM) 受体具有较低的亲和力,而 (−)-FBT 对 VAcChT 和 σ1 受体 (∼20 nM) 具有相似的亲和力,对 σ2 (110 nM) 受体具有较低的亲和力。使用 [18F](+)-FBT 对恒河猴 (n = 3) 进行 PET 成像研究。 [18F](+)-FBT被发现在基底神经节中具有较高的积累和缓慢的清除率,这与该脑区胆碱能中间神经元的标记一致。 [18F](+)-FBT 在 PET 的 3 小时过程中也表现出可逆的结合动力学,并产生不穿过血脑屏障的放射性标记代谢物。目前的体外和体内研究结果表明,[18F](+)-FBT 是一种很有前景的配体,可用于通过 PET、VAcChT 研究胆碱能末端密度。突触 25:368–380, 1997。© 1997 Wiley‐Liss, Inc.
The goal of the present set of studies was to characterize the in vitro binding properties and in vivo tissue kinetics for the vesicular acetylcholine transporter (VAcChT) radiotracer, [18F](+)‐4‐fluorobenzyltrozamicol ([18F](+)‐FBT). In vitro binding studies were conducted in order to determine the affinity of the (+)‐ and (−)‐ stereoisomers of FBT for the VAcChT as well as sigma (σ2 and σ2) receptors. (+)‐FBT was found to have a high affinity (Ki = 0.22 nM) for the VAcChT and lower affinities for σ1 (21.6 nM) and σ2 (35.9 nM) receptors, whereas (−)‐FBT had similar affinities for the VAcChT and σ1 receptors (∼20 nM) and a lower affinity for σ2 (110 nM) receptors. PET imaging studies were conducted in rhesus monkeys (n = 3) with [18F](+)‐FBT. [18F](+)‐FBT was found to have a high accumulation and slow rate of washout from the basal ganglia, which is consistent with the labeling of cholinergic interneurons in this brain region. [18F](+)‐FBT also displayed reversible binding kinetics during the 3 h time course of PET and produced radiolabeled metabolites that did not cross the blood‐brain barrier. The results from the current in vitro and in vivo studies indicate that [18F](+)‐FBT is a promising ligand for studying cholinergic terminal density, with PET, via the VAcChT. Synapse 25:368–380, 1997. © 1997 Wiley‐Liss, Inc.
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