Journal Article Benzyl [11C]Hippurate as an Agent for Measuring the Activities of Organic Anion Transporter 3 in the Brain and Multidrug Resistance-Associated Protein 4 in the Heart of Mice.

Kikuchi, Tatsuya  ,  Okamura, Toshimitsu  ,  Okada, Maki  ,  Ogawa, Masanao  ,  Suzuki, Chie  ,  Wakizaka, Hidekatsu  ,  Yui, Joji  ,  Fukumura, Toshimitsu  ,  D Gee, Antony  ,  Ming-Rong, Zhang

59 ( 12 )  , pp.5847 - 5856 , 2016-05 , American Chemical Society
Multidrug resistance-associated protein 4 (MRP4) and organic anion transporter 3 (OAT3) mediate the efflux of organic anions from the brain and heart. In this study, we have developed a probe for estimating the activity of these transporters in these tissues using positron emission tomography. Several 11C-labeled hippuric acid ester derivatives were screened with the expectation that they would be hydrolyzed in situ to form the corresponding 11C-labeled organic acids in target tissues. Among the compounds screened, benzyl [11C]hippurate showed favorable hydrolysis rates and uptake properties in the target tissues of mice. Subsequent evaluation using transporter knockout mice revealed that radioactivity was retained in the brain and heart of Oat3(-/-) and Mrp4(-/-) mice, respectively, compared with that of control mice after the intravenous administration of benzyl [11C]hippurate. Benzyl [11C]hippurate could therefore be used as a probe for estimating the activities of OAT3 and MRP4 in mouse brain and heart, respectively.

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