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Zebrafish (Danio rerio) Oat1 and Oat3 transporters and their interaction with physiological compounds

Dragojević, Jelena; Mihaljević, Ivan; Popović, Marta; Smital, Tvrtko (2019) Zebrafish (Danio rerio) Oat1 and Oat3 transporters and their interaction with physiological compounds. Comparative Biochemistry and Physiology - Part B: Biochemistry and Molecular Biology, 236 . ISSN 1096-4959

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Organic anion transporters (OATs) are membrane proteins within the Solute carrier family 22 (SLC22). They play important roles in cellular uptake of various organic compounds, and due to their expression in barrier tissues of major excretory and non-excretory organs are considered as crucial elements in absorption and distribution of a wide range of endobiotic and xenobiotic compounds. Based on our previous work and initial insights on SLC22 members in zebrafish (Danio rerio), in this study we aimed at in vitro characterization of Oat1 and Oat3 transporters and understanding of their interaction with potential physiological substrates. We first performed synteny analysis to describe in more detail orthological relationship of zebrafish oat1 and oat3 genes. We then developed stable cell lines overexpressing Oat1 and Oat3, and identified Lucifer yellow as Oat1 model fluorescent substrate (Km = 11.4 µM) and 6- carboxyfluorescein as Oat3 model substrate (Km = 5.8 µM). Initial identification performed using the developed assays revealed Kreb’s cycle intermediates, bilirubin, bile salts and steroid hormones as the most potent of Oat1 and Oat3 interactors, with IC50 values in micromolar range. Finally, we showed that bilirubin, deoxycholic acid, α-ketoglutarate, pregnenolone, estrone-3-sulfate and corticosterone are in vitro substrates of zebrafish Oat1, and bilirubin and deoxycholic acid are Oat3 substrates. In conclusion, using the approach described, structural and functional similarities of both transporters to human and mammalian orthologs are revealed, their broad ligand selectivity confirmed, potent interactors among endobiotic compounds identified, and first indications of their potential physiological role(s) in zebrafish obtained.

Item Type: Article
Additional Information: This research was supported by the Croatian National Science Foundation (Project No. 4806), the SCOPES programme joint research project granted by the Swiss National Science Foundation (SNSF) (Grant No. SCOPES -IZ73ZO_152274/1), and by the project STIM - REI, Contract Number: KK., a project funded by the European Union through the European Regional Development Fund - the Operational Programme Competitiveness and Cohesion 2014-2020 (KK.
Uncontrolled Keywords: zebrafish, Oat1 and Oat3, synteny ; stable transfectants ; physiological interactors
Subjects: NATURAL SCIENCES > Biology
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Identifikacija i funkcionalna karakterizacija (eko)toksikološki važnih polispecifičnih membranskih transportnih proteina u zebrici (Danio rerio)-TRANS-ZEBRATOXTvrtko SmitalIP-2013-11-4806HRZZ
Depositing User: Tvrtko Smital
Date Deposited: 07 May 2020 08:12
DOI: 10.1016/j.cbpb.2019.110309

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