Novel potential pyrazolopyrimidine based translocator protein ligands for the evaluation of neuroinflammation with PET
作者:Young-Do Kwon、Shinwoo Kang、Hyunjun Park、Il-koo Cheong、Keun-A Chang、Sang-Yoon Lee、Jae Ho Jung、Byung Chul Lee、Seok Tae Lim、Hee-Kwon Kim
DOI:10.1016/j.ejmech.2018.09.069
日期:2018.11
in vitro affinity study suggests that 2-(5,7-diethyl-2-(4-(3-fluoro-2-methylpropoxy)phenyl)pyrazolo[1,5-a]pyrimidin-3-yl)-N,N-diethylacetamide (14a), which exhibited high nano-molar affinity for TSPO and proper lipophilicity, was suitable for in vivo brain studies. Thus, radiosynthesis from tosylate precursor 13a using fluorine-18 was performed, and [18F]14a was obtained in a 31% radiochemical yield (decay-corrected)
转运蛋白(TSPO)是一个有趣的生物学靶标,因为TSPO的过表达与神经元损伤或神经发炎引起的小胶质细胞活化有关,而这些活化的小胶质细胞与几种中枢神经系统疾病有关。在此,合成了基于2-苯基吡唑并[1,5 - a ]嘧啶-3-基乙酰胺支架的新型氟化配体(14a–c和16a–c),并对每种新型配体进行了体外表征阐明结构活动关系。所有新合成的配体均显示出对TSPO的纳摩尔摩尔亲和力。特别是体外亲和力研究表明,2-(5,7-二乙基-2-(4-(3-氟-2-甲基丙氧基)苯基)吡唑并[1,5 - a ]嘧啶-3-基)-N,N-二乙基乙酰胺(对TSPO表现出高纳摩尔摩尔亲和力和适当的亲脂性的14a)适用于体内脑研究。因此,使用氟-18从甲苯磺酸酯前体13a进行了放射性合成,以31%的放射化学收率(校正了衰变)获得了[ 18 F] 14a。使用[ 18 F] 14a在脂多糖(LPS)诱导的神经炎症大鼠模型中