Synthesis, radiolabeling and initial in vivo evaluation of [11C]KSM-01 for imaging PPAR-α receptors
作者:Kiran Kumar Solingapuram Sai、Kun-eek Kil、Zhude Tu、Wenhua Chu、Brian N. Finck、Justin M. Rothfuss、Kooresh I. Shoghi、Michael J. Welch、Robert J. Gropler、Robert H. Mach
DOI:10.1016/j.bmcl.2012.08.010
日期:2012.10
Peroxisome proliferator-activated receptor alpha (PPAR-alpha) is a ligand-activated nuclear receptor transcription factor that regulates the fatty acid beta-oxidation. An in vitro assay identified the p-methoxy phenyl ureido thiobutyric acid derivative KSM-01 (IC50 = 0.28 +/- 0.09 nM) having a higher affinity to activate PPAR-alpha than the PPAR-alpha agonist GW7647 (IC50 = 0.46 +/- 0.19 nM). In this study, we report the synthesis and initial in vivo evaluation of [C-11] KSM-01. The radiosynthesis was carried out by first alkylating the corresponding p-phenol precursor with [C-11]MeI in DMF using NaOH, followed by deprotection of the t-butyl ester group by TFA, yielding [C-11]KSM-01. SUV analysis of dynamic micro PET/CT imaging data showed that [C-11]KSM-01 accumulation was similar to 2.0-fold greater in cardiac-specific PPAR-alpha overexpressing transgenic mice compared to wild-type littermates. The post-PET biodistribution studies were consistent with these results and demonstrated 2.5-fold greater radiotracer uptake in the heart of transgenic mice compared to the wild-type littermates. These results demonstrate the potential utility of PPAR-alpha agonists as PET radiopharmaceuticals. (C) 2012 Elsevier Ltd. All rights reserved.