In Vitro and in Vivo Evaluation of <sup>11</sup>C-Labeled Azetidinecarboxylates for Imaging Monoacylglycerol Lipase by PET Imaging Studies
作者:Ran Cheng、Wakana Mori、Longle Ma、Mireille Alhouayek、Akiko Hatori、Yiding Zhang、Daisuke Ogasawara、Gengyang Yuan、Zhen Chen、Xiaofei Zhang、Hang Shi、Tomoteru Yamasaki、Lin Xie、Katsushi Kumata、Masayuki Fujinaga、Yuji Nagai、Takafumi Minamimoto、Mona Svensson、Lu Wang、Yunfei Du、Mary Jo Ondrechen、Neil Vasdev、Benjamin F. Cravatt、Christopher Fowler、Ming-Rong Zhang、Steven H. Liang
DOI:10.1021/acs.jmedchem.7b01400
日期:2018.3.22
Monoacylglycerol lipase (MAGL) is the principle enzyme for metabolizing endogenous cannabinoid ligand 2-arachidonoyglycerol (2-AG). Blockade of MAGL increases 2-AG levels, resulting in subsequent activation of the endocannabinoid system, and has emerged as a novel therapeutic strategy to treat drug addiction, inflammation, and neurodegenerative diseases. Herein we report a new series of MAGL inhibitors, which were radiolabeled by site-specific labeling technologies, including C-11-carbonylation and spirocyclic iodonium ylide (SCIDY) radio fluorination. The lead compound [C-11]10 (MAGL-0519) demonstrated high specific binding and selectivity in vitro and in vivo. We also observed unexpected washout kinetics with these irreversible radiotracers, in which in vivo evidence for turnover of the covalent residue was unveiled between MAGL and azetidine carboxylates. This work may lead to new directions for drug discovery and PET tracer development based on azetidine carboxylate inhibitor scaffold.