Altropane, a SPECT or PET imaging probe for dopamine neurons: I. dopamine transporter binding in primate brain

Altropane, a SPECT or PET imaging probe for dopamine neurons: I. dopamine transporter binding in primate brain
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Altropane,一种用于多巴胺神经元的 SPECT 或 PET 成像探针:I. 灵长类动物大脑中的多巴胺转运蛋白结合

DOI:
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发表时间:
1998
期刊:
影响因子:
2.3
通讯作者:
A. Fischman
A. Fischman
中科院分区:
医学4区
文献类型:
--
作者:
B. Madras;P. Meltzer;A. Liang;D. Elmaleh;J. Babich;A. Fischman

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越来越多的证据表明,多巴胺转运蛋白是多巴胺神经元生理和病理变化的重要标志物。苯托烷系列的强效多巴胺转运抑制剂(例如 WIN 35,428 或 CFT)特别适用于活体大脑中多巴胺转运蛋白的 PET(正电子发射断层扫描)或 SPECT(单光子发射计算机断层扫描)成像。我们研究了阿托烷(WIN 35,428 的 N-碘代烯丙基类似物(IACFT:E-N-碘代烯丙基-2β-甲氧甲氧基-3β-(4-氟苯基)托烷))是否显示出适合作为 SPECT 成像剂进行评估的体外特性。在食蟹猴(食蟹猴)的脑纹状体中,未标记的 E 异构体(IC50:6.62 ± 0.78 nM)比 Z 异构体(IC50:52.6 ± 0.3 nM)更有效,并且表现出相对较高的多巴胺:5-羟色胺转运蛋白选择性(28 倍)。在放射性标记形式中,[125I]阿托烷以单一高亲和力(KD:5.33±0.55nM)与纹状体中的位点结合,并且位点密度(BMAX:301pmol/g原始湿组织重量)在先前报道的纹状体中多巴胺转运蛋白的密度范围内。药物抑制 [125I]altropane 结合的效力等级顺序与其抑制 [3H]WIN 35,428 结合(r2:0.99;P < 0.0001)阻断多巴胺转运的效力密切对应。阿托烷良好的结合特性,加上其快速进入灵长类动物大脑以及在富含多巴胺的大脑区域的高度局部分布,表明它是一种合适的碘化探针,用于通过 SPECT 或 PET 成像监测体外和体内的多巴胺转运蛋白。突触 29:93–104, 1998。© 1998 Wiley‐Liss, Inc.
Increasing evidence suggests that the dopamine transporter is an important marker for physiological and pathological changes in dopamine neurons. Potent dopamine transport inhibitors of the phenyltropane series (e.g., WIN 35,428 or CFT) are particularly suitable for PET (positron emission tomography) or SPECT (single photon emission computed tomography) imaging of the dopamine transporter in living brain. We investigated whether altropane, an N‐iodoallyl analog of WIN 35,428 (IACFT:E‐N‐iodoallyl‐2β‐carbomethoxy‐3β‐(4‐fluorophenyl)tropane), displayed in vitro properties suitable for evaluation as a SPECT imaging agent. In brain striatum of cynomolgus monkey (Macaca fascicularis), the unlabeled E‐isomer (IC50: 6.62 ± 0.78 nM) was more potent than the Z‐isomer (IC50: 52.6 ± 0.3 nM) and displayed a relatively high dopamine:serotonin transporter selectivity (28‐fold). In radiolabeled form, [125I]altropane bound to sites in the striatum with a single high affinity (KD: 5.33 ± 0.55 nM) and with a site density (BMAX: 301 pmol/g original wet tissue weight) that was within the density range reported previously for the dopamine transporter in striatum. Drugs inhibited [125I]altropane binding with a rank order of potency that corresponded closely to their potencies for inhibiting [3H]WIN 35,428 binding (r2: 0.99; P < 0.0001) to the blocking dopamine transport. The favorable binding properties of altropane, together with its rapid entry into primate brain and highly localized distribution in dopamine‐rich brain regions, suggest it is a suitable iodinated probe for monitoring the dopamine transporter in vitro and in vivo by SPECT or PET imaging. Synapse 29:93–104, 1998. © 1998 Wiley‐Liss, Inc.
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