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Nakaoka T, Uetake Y, Kaneko KI, Niwa T, Ochiai H, Irie S, Suezaki Y, Otsuka N, Hayashinaka E, Wada Y, Cui Y, Maeda K, Kusuhara H, Sugiyama Y, Hosoya T, Watanabe Y. Practical Synthesis of [ 18F]Pitavastatin and Evaluation of Hepatobiliary Transport Activity in Rats by Positron Emission Tomography. Mol Pharm 2020; 17:1884-1898. [PMID: 32271581 DOI: 10.1021/acs.molpharmaceut.9b01284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We developed a practical synthetic method for fluorine-18 (18F)-labeled pitavastatin ([18F]PTV) as a positron emission tomography (PET) tracer to assess hepatobiliary transporter activity and conducted a PET scan as a preclinical study for proof-of-concept in rats. This method is a one-pot synthesis involving aromatic 18F-fluorination of an arylboronic acid ester followed by deprotection under acidic conditions, which can be reproduced in general clinical sites equipped with a standard radiolabeling system due to the simplified procedure. PET imaging confirmed that intravenously administered [18F]PTV was rapidly accumulated in the liver and gradually transferred into the intestinal lumen through the bile duct. Radiometabolite analysis showed that [18F]PTV was metabolically stable, and 80% of the injected dose was detected as the unchanged form in both blood and bile. We applied integration plot analysis to assess tissue uptake clearance (CLuptake, liver and CLuptake, kidney) and canalicular efflux clearance (CLint, bile), and examined the effects of inhibitors on membrane transport. Treatment with rifampicin, an organic anion transporting polypeptide inhibitor, significantly reduced CLuptake, liver and CLuptake, kidney to 44% and 64% of control, respectively. In contrast, Ko143, a breast cancer resistance protein inhibitor, did not affect CLuptake, liver but significantly reduced CLint, bile to 39% of control without change in [18F]PTV blood concentration. In addition, we found decreased CLuptake, liver and increased CLint, bile in Eisai hyperbilirubinemic rats in response to altered expression levels of transporters. We expect that [18F]PTV can be translated into clinical application, as our synthetic method does not need special apparatus in the radiolabeling system and PET scan with [18F]PTV can quantitatively evaluate transporter activity in vivo.
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Affiliation(s)
- Takayoshi Nakaoka
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Yuta Uetake
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Ken-Ichi Kaneko
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Takashi Niwa
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Hidenori Ochiai
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Satsuki Irie
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Yoshie Suezaki
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Natsumi Otsuka
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Emi Hayashinaka
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Yasuhiro Wada
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Yilong Cui
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Kazuya Maeda
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroyuki Kusuhara
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yuichi Sugiyama
- Sugiyama Laboratory, RIKEN Innovation Center, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Takamitsu Hosoya
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Yasuyoshi Watanabe
- RIKEN Center for Life Science Technologies (CLST), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.,RIKEN Center for Biosystems Dynamics Research (BDR), 6-7-3 minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
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Hernández Lozano I, Langer O. Use of imaging to assess the activity of hepatic transporters. Expert Opin Drug Metab Toxicol 2020; 16:149-164. [PMID: 31951754 PMCID: PMC7055509 DOI: 10.1080/17425255.2020.1718107] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 01/15/2020] [Indexed: 12/13/2022]
Abstract
Introduction: Membrane transporters of the SLC and ABC families are abundantly expressed in the liver, where they control the transfer of drugs/drug metabolites across the sinusoidal and canalicular hepatocyte membranes and play a pivotal role in hepatic drug clearance. Noninvasive imaging methods, such as PET, SPECT or MRI, allow for measuring the activity of hepatic transporters in vivo, provided that suitable transporter imaging probes are available.Areas covered: We give an overview of the working principles of imaging-based assessment of hepatic transporter activity. We discuss different currently available PET/SPECT radiotracers and MRI contrast agents and their applications to measure hepatic transporter activity in health and disease. We cover mathematical modeling approaches to obtain quantitative parameters of transporter activity and provide a critical assessment of methodological limitations and challenges associated with this approach.Expert opinion: PET in combination with pharmacokinetic modeling can be potentially applied in drug development to study the distribution of new drug candidates to the liver and their clearance mechanisms. This approach bears potential to mechanistically assess transporter-mediated drug-drug interactions, to assess the influence of disease on hepatic drug disposition and to validate and refine currently available in vitro-in vivo extrapolation methods to predict hepatic clearance of drugs.
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Affiliation(s)
| | - Oliver Langer
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria
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