Synthesis and biodistribution of [11C]A-836339, a new potential radioligand for PET imaging of cannabinoid type 2 receptors (CB2).

Synthesis and biodistribution of [11C]A-836339, a new potential radioligand for PET imaging of cannabinoid type 2 receptors (CB2).
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DOI:
10.1016/j.bmc.2010.05.058
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发表时间:
2010-07-15
影响因子:
3.5
通讯作者:
Dannals, Robert F.
Dannals, Robert F.
中科院分区:
医学3区
文献类型:
--
作者:
Horti, Andrew G.;Gao, Yongjun;Ravert, Hayden T.;Finley, Paige;Valentine, Heather;Wong, Dean F.;Endres, Christopher J.;Savonenko, Alena V.;Dannals, Robert F.

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最近,A-836339[2,2,3,3-四甲基环丙烷羧酸[3-(2-methoxyethyl)-4,5-dimethyl-3H-thiazol-(2Z)-ylidene]amide](1)]被报道为一种高结合亲和力的选择性CB2激动剂。在这里,我们描述了[11C]A-836339([11C]1)通过其脱甲基前体的放射合成,作为用正电子发射断层扫描成像CB2受体的候选放射配基。[11C]1在对照CD1小鼠体内的全身和局部脑分布表明,该放射性配基在富含CB2的脾中表现出特异性摄取,而在对照小鼠脑中几乎没有特异性结合。然而,在脂多糖诱导的神经炎小鼠模型和阿尔茨海默病小鼠模型(APPswe/PS1dE9小鼠)中,[11C]1显示了特定的大脑摄取,并在阿尔茨海默病小鼠(APPswe/PS1dE9小鼠)中有β-淀粉样斑块沉积的脑区。这些数据确立了CB2受体与神经炎症和相关疾病结合的原理可以在体内测量的证据。
Recently, A-836339 [2,2,3,3-tetramethylcyclopropanecarboxylic acid [3-(2-methoxyethyl)-4,5-dimethyl-3H-thiazol-(2Z)-ylidene]amide] (1) was reported to be a selective CB2 agonist with high binding affinity. Here we describe the radiosynthesis of [11C]A-836339 ([11C]1) via its desmethyl precursor as a candidate radioligand for imaging CB2 receptors with positron emission tomography (PET). Whole body and the regional brain distribution of [11C]1 in control CD1 mice demonstrated that this radioligand exhibits specific uptake in the CB2-rich spleen and little specific in vivo binding in the control mouse brain. However, [11C]1 shows specific cerebral uptake in the lipopolysaccharide (LPS)-induced mouse model of neuroinflammation and in the brain areas with Aβ-amyloid plaque deposition in a mouse model of Alzheimer's disease (APPswe/PS1dE9 mice). These data establish a proof of principle that CB2 receptors binding in the neuroinflammation and related disorders can be measured in vivo.
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