Transport of 3-fluoro-l-α-methyl-tyrosine (FAMT) by organic ion transporters explains renal background in [18F]FAMT positron emission tomography
| Autor: | Kohei Hagiwara, Yukio Kato, Shushi Nagamori, Pattama Wiriyasermkul, Ling Wei, Kyoichi Kaira, Ryuichi Ohgaki, Yoshikatsu Kanai, Suguru Okuda, Hideyuki Tominaga, Noboru Oriuchi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Fluorine Radioisotopes Organic Cation Transport Proteins Methyltyrosines Organic Anion Transporters Transporter Kidney Large Neutral Amino Acid-Transporter 1 Xenopus laevis 03 medical and health sciences Organic Anion Transport Protein 1 0302 clinical medicine Neoplasms medicine Animals Humans Amino acid transporter Tyrosine Solute Carrier Family 22 Member 5 Epithelial transport Cells Cultured Pharmacology chemistry.chemical_classification biology Chemistry PET tracer lcsh:RM1-950 Furosemide Biological Transport Epithelial Cells Organic anion Amino acid Probenecid Kidney Tubules lcsh:Therapeutics. Pharmacology 030104 developmental biology medicine.anatomical_structure Biochemistry Positron-Emission Tomography 030220 oncology & carcinogenesis Oocytes biology.protein Molecular Medicine Radiopharmaceuticals medicine.drug |
| Zdroj: | Journal of Pharmacological Sciences, Vol 130, Iss 2, Pp 101-109 (2016) |
| ISSN: | 1347-8613 |
| DOI: | 10.1016/j.jphs.2016.01.001 |
| Popis: | A PET tracer for tumor imaging, 3- 18 F- l - α -methyl-tyrosine ([ 18 F]FAMT), has advantages of high cancer-specificity and low physiological background. In clinical studies, FAMT-PET has been proved useful for the detection of malignant tumors and their differentiation from inflammation and benign lesions. The tumor specific uptake of FAMT is due to its high-selectivity to cancer-type amino acid transporter LAT1 among amino acid transporters. In [ 18 F]FAMT PET, kidney is the only organ that shows high physiological background. To reveal transporters involved in renal accumulation of FAMT, we have examined [ 14 C]FAMT uptake on the organic ion transporters responsible for the uptake into tubular epithelial cells. We have found that OAT1, OAT10 and OCTN2 transport [ 14 C]FAMT. The [ 14 C]FAMT uptake was inhibited by probenecid, furosemide and ethacrynic acid, consistent with the properties of the transporters. The amino acid uptake inhibitor, 2-amino-2-norbornanecarboxylic acid (BCH), also inhibited the [ 14 C]FAMT uptake, whereas OCTN2-mediated [ 14 C]FAMT uptake was Na + -dependent. We propose that FAMT uptake by OAT1, OAT10 and OCTN2 into tubular epithelial cells could contribute to the renal accumulation of FAMT. The results from this study would provide clues to the treatments to reduce renal background and enhance tumor uptake as well as to designing PET tracers with less renal accumulation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|