Evaluation of transporter-mediated hepatobiliary transport of newly developed 18F-labeled pitavastatin derivative, PTV-F1, in rats by PET imaging

Autor: Hiroyuki Kusuhara, Hiroyuki Kimura, Shinya Kagawa, Kenji Arimitsu, Hideo Saji, Masahiro Ono, Kaori Togashi, Tatsuya Higashi, Kazuya Maeda, Yuji Nakamoto, Mutsumi Mikamo, Ryuichi Nishii, Yusuke Yagi
Rok vydání: 2019
Předmět:
Zdroj: Drug Metabolism and Pharmacokinetics. 34:317-324
ISSN: 1347-4367
Popis: Quantitative evaluations of the functions of uptake and efflux transporters directly in vivo is desired to understand an efficient hepatobiliary transport of substrate drugs. Pitavastatin is a substrate of organic anion transporting polypeptides (OATPs) and canalicular efflux transporters; thus, it can be a suitable probe for positron-emission tomography (PET) imaging of hepatic transporter functions. To characterize the performance of [18F]PTV-F1, an analogue of pitavastatin, we investigated the impact of rifampicin (a typical OATP inhibitor) coadministration or Bcrp (breast cancer resistance protein) knockout on [18F]PTV-F1 hepatic uptake and efflux in rats by PET imaging. After intravenous administration, [18F]PTV-F1 selectively accumulated in the liver, and the radioactivity detected in plasma, liver, and bile mainly derived from the parent PTV-F1 during the PET study (∼40 min). Coadministration of rifampicin largely decreased the hepatic uptake of [18F]PTV-F1 by 73%. Because of its lower clearance in rats, [18F]PTV-F1 is more sensitive for monitoring changes in hepatic OATP1B function that other previously reported OATP1B PET probes. Rifampicin coadministration also significantly decreased the biliary excretion of radioactivity by 65%. Bcrp knockout did not show a significant impact on its biliary excretion.[18F]PTV-F1 enables quantitative analysis of the hepatobiliary transport system for organic anions.
Databáze: OpenAIRE
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