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• W4387241872 abstract "Abstract Organic anion transporting polypeptides OATP1A2, OATP1B1, OATP1B3 and OATP2B1 are Na + ‐ and ATP‐independent exchangers of large, organic compounds, encompassing structurally diverse xenobiotics, including various drugs. These OATPs influence intestinal absorption (OATP2B1), hepatic clearance (OATP1B1/3) and blood to brain penetration (OATP1A2, OATP2B1) of their drug substrates. Consequently, OATP‐mediated drug or food interactions may lead to altered pharmacokinetics and toxicity. During drug development, investigation of hepatic OATP1B1 and OATP1B3 is recommended by international regulatory agencies. Most frequently, OATP‐drug interactions are investigated in an indirect assay, i.e., by examining uptake inhibition of a radioactive or fluorescent probe. However, indirect assays do not distinguish between transported substrates and non‐transported OATP inhibitors. To fill this hiatus, a novel assay, termed competitive counterflow (CCF) has been developed and has since been applied for several OATPs to differentiate between substrates and non‐transported inhibitors. However, previous OATP CCF assays, with the exception of that for OATP1B1, used radioactive probes. In the current study, we demonstrate that sulforhodamine 101 or pyranine can be used as fluorescent probes in a CCF assay to identify transported substrates of OATP1A2, or OATPs 1B1, 1B3 and 2B1, respectively. With the help of the newly developed fluorescence‐based CCF method, we identify the FDA‐approved anti‐protozoal drug, pentamidine as a unique substrate of OATP1A2. Furthermore, we confirm the selective, OATP1A2‐mediated uptake of pentamidine in a cytotoxicity assay. Based on our results, OATP1A2 may be an important determinant of pentamidine transport through the blood–brain barrier." @default.
• W4387241872 created "2023-10-03" @default.
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• W4387241872 date "2023-10-02" @default.
• W4387241872 modified "2023-10-17" @default.
• W4387241872 title "The fluorescence‐based competitive counterflow assay developed for organic anion transporting polypeptides <scp>1A2</scp>, <scp>1B1</scp>, <scp>1B3</scp> and <scp>2B1</scp> identifies pentamidine as a selective <scp>OATP1A2</scp> substrate" @default.
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• W4387241872 doi "https://doi.org/10.1096/fj.202300530rr" @default.
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• W4387241872 hasPublicationYear "2023" @default.
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