Novel Pyrazolo[1,5-<i>a</i>]pyrimidines as Translocator Protein 18 kDa (TSPO) Ligands: Synthesis, <i>in Vitro</i> Biological Evaluation, [<sup>18</sup>F]-Labeling, and <i>in Vivo</i> Neuroinflammation PET Images
作者:Annelaure Damont、Vincent Médran-Navarrete、Fanny Cacheux、Bertrand Kuhnast、Géraldine Pottier、Nicholas Bernards、Frank Marguet、Frédéric Puech、Raphaël Boisgard、Frédéric Dollé
DOI:10.1021/acs.jmedchem.5b00932
日期:2015.9.24
A series of novel pyrazolo[1,5-a]pyrimidines, closely related to N,N-diethyl-2-(2-(4-(2-fluoroethoxy)phenyl)-5,7-dimethylpyrazolo[1,5-a]pyrimidin-3-yl)acetamide (2, DPA-714), were synthesized and biologically in vitro evaluated for their potential to bind the translocator protein 18 kDa (TSPO), a protein today recognized as an early biomarker of neuroinflammatory processes. This series is composed
一系列新的吡唑的[1,5-一个]嘧啶,密切相关的Ñ,ñ -二乙基- 2-(2-(4-(2-氟乙氧基)苯基)-5,7-二甲基[1,5-一个合成]嘧啶-3-基)乙酰胺(2,DPA-714),并在生物学上体外评估其结合转运蛋白18 kDa(TSPO)的潜力,该蛋白今天被认为是神经炎症过程的早期生物标记。该系列由氟烷基-和氟炔基-类似物组成,它们是通过Sonogashira偶联反应从常见的碘化中间体制得的。所有衍生物均表现出对TSPO的亚纳摩尔亲和力(0.37至0.86 nM),与2的亲和力相当(0.91 nM)。其中两个被氟18放射性标记,并通过体外放射自显影和正电子发射断层扫描(PET)成像在啮齿类神经炎模型上研究了它们的生物分布。两种化合物在AMPA介导的病变中的大脑摄取和局部蓄积证实了它们作为体内PET放射治疗者的潜力。特别地,[ 18 F] 23在体内显示出比母体分子[ 18 F] 2在60分钟时显着更高的ipsi-对侧比。