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Fattah S, Shinde AB, Matic M, Baes M, van Schaik RHN, Allegaert K, Parmentier C, Richert L, Augustijns P, Annaert P. Inter-Subject Variability in OCT1 Activity in 27 Batches of Cryopreserved Human Hepatocytes and Association with OCT1 mRNA Expression and Genotype. Pharm Res 2017; 34:1309-1319. [PMID: 28364304 DOI: 10.1007/s11095-017-2148-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 03/17/2017] [Indexed: 01/11/2023]
Abstract
PURPOSE OCT1/3 (Organic Cation Transporter-1 and -3; SLC22A1/3) are transmembrane proteins localized at the basolateral membrane of hepatocytes. They mediate the uptake of cationic endogenous compounds and/or xenobiotics. The present study was set up to verify whether the previously observed variability in OCT activity in hepatocytes may be explained by inter-individual differences in OCT1/3 mRNA levels or OCT1 genotype. METHODS Twenty-seven batches of cryopreserved human hepatocytes (male and female, age 24-88 y) were characterized for OCT activity, normalized OCT1/3 mRNA expression, and OCT1 genetic mutation. ASP+ (4-[4-(dimethylamino)styryl]-N-methylpyridinium iodide) was used as probe substrate. RESULTS ASP+ uptake ranged between 75 ± 61 and 2531 ± 202 pmol/(min × million cells). The relative OCT1 and OCT3 mRNA expression ranged between 0.007-0.46 and 0.0002-0.005, respectively. The presence of one or two nonfunctional SLC22A1 alleles was observed in 13 batches and these exhibited significant (p = 0.04) association with OCT1 and OCT3 mRNA expression. However, direct association between genotype and OCT activity could not be established. CONCLUSION mRNA levels and genotype of OCT only partially explain inter-individual variability in OCT-mediated transport. Our findings illustrate the necessity of in vitro transporter activity profiling for better understanding of inter-individual drug disposition behavior.
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Affiliation(s)
- Sarinj Fattah
- Drug Delivery and Disposition, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Campus Gasthuisberg O&N II Herestraat 49 Box 921, 3000, Leuven, Belgium
| | - Abhijit Babaji Shinde
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Maja Matic
- Department Clinical Chemistry, Erasmus University Medical Centre, Rotterdam, Netherlands.,Intensive Care and Department of Surgery, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Ron H N van Schaik
- Department Clinical Chemistry, Erasmus University Medical Centre, Rotterdam, Netherlands
| | - Karel Allegaert
- Intensive Care and Department of Surgery, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands.,Department of Development and Regeneration, KU Leuven, Leuven, Belgium
| | | | - Lysiane Richert
- KaLy-Cell, Plobsheim, France.,Université de Franche-Comté, 4267, Besançon, EA, France
| | - Patrick Augustijns
- Drug Delivery and Disposition, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Campus Gasthuisberg O&N II Herestraat 49 Box 921, 3000, Leuven, Belgium
| | - Pieter Annaert
- Drug Delivery and Disposition, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Campus Gasthuisberg O&N II Herestraat 49 Box 921, 3000, Leuven, Belgium.
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