Radiosynthesis and in vivo evaluation of [11C]MP-10 as a PET probe for imaging PDE10A in rodent and non-human primate brain
作者:Zhude Tu、Jinda Fan、Shihong Li、Lynne A. Jones、Jinquan Cui、Prashanth K. Padakanti、Jinbin Xu、Dexing Zeng、Kooresh I. Shoghi、Joel S. Perlmutter、Robert H. Mach
DOI:10.1016/j.bmc.2011.01.032
日期:2011.3
2-((4-(1-[C-11]Methyl-4-(pyridin-4-yl)-1H-pyrazol-3-yl)phenoxy)methyl)-quinoline (MP-10), a specific PDE10A inhibitor (IC50 = 0.18 nM with 100-fold selectivity over other PDEs), was radiosynthesized by alkylation of the desmethyl precursor with [C-11]CH3I, similar to 45% yield, > 92% radiochemical purity, > 370 GBq/mu mol specific activity at end of bombardment (EOB). Evaluation in Sprague-Dawley rats revealed that [C-11]MP-10 had highest brain accumulation in the PDE10A enriched-striatum, the 30 min striatum: cerebellum ratio reached 6.55. MicroPET studies of [C-11]MP-10 in monkeys displayed selective uptake in striatum. However, a radiolabeled metabolite capable of penetrating the blood-brain-barrier may limit the clinical utility of [C-11] MP-10 as a PDE10A PET tracer. (C) 2011 Elsevier Ltd. All rights reserved.