Development of new carbon-11 labelled radiotracers for imaging GABAA- and GABAB-benzodiazepine receptors
作者:Matthew D. Moran、Alan A. Wilson、Charles S. Elmore、Jun Parkes、Alvina Ng、Oleg Sadovski、Ariel Graff、Zafiris J. Daskalakis、Sylvain Houle、Marc J. Chapdelaine、Neil Vasdev
DOI:10.1016/j.bmc.2012.05.046
日期:2012.7
labelled 5 readily penetrated the brain (>1 standard uptake value in cortical regions at 15 min post-injection of the radiotracer), had an appropriate regional brain distribution for GABAA receptors that appeared to be reversible, and did not show any appreciable radiometabolites in rat brain homogenates up to 15 min post-injection. Preadministration of flumazenil (1, 10 mg kg−1) or 5 (5 mg kg−1) effectively
标识为γ氨基丁酸的正变构调节两个喹啉(GABA)甲含有α受体2亚基,9-氨基-2-环丁基-5-(6-甲氧基-2-甲基吡啶-3-基)-2,3- -二氢-1 H-吡咯并[3,4- b ]喹啉-1-酮(4)和9-氨基-2-环丁基-5-(2-甲氧基吡啶-3-基)-2,3-二氢-1 H-吡咯并[3,4- b ]喹啉-1-酮(5)在碳11的甲氧基位置进行了放射性标记(半衰期= 20.4分钟)。这些喹啉代表了一类新型的潜在放射性示踪剂,可用于对GABA A的苯二氮卓部位进行成像正电子发射断层扫描(PET)的受体。在各自的吡啶酮/吡啶醇互变异构体前体与临床上可配制的[ 11 C] CH 3 I反应后,分别可靠地分离出两种放射性示踪剂(相对于[ 11 C] CO 2,未校正的放射化学产率分别为2.9%和2.7%)具有高比活度(> 70 GBqμmol -1 ;> 2 Ciμmol –1)和高放射化学纯度(>