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Nieskens TTG, Peters JGP, Dabaghie D, Korte D, Jansen K, Van Asbeck AH, Tavraz NN, Friedrich T, Russel FGM, Masereeuw R, Wilmer MJ. Expression of Organic Anion Transporter 1 or 3 in Human Kidney Proximal Tubule Cells Reduces Cisplatin Sensitivity. Drug Metab Dispos 2018. [PMID: 29514829 DOI: 10.1124/dmd.117.079384] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Cisplatin is a cytostatic drug used for treatment of solid organ tumors. The main adverse effect is organic cation transporter 2 (OCT2)-mediated nephrotoxicity, observed in 30% of patients. The contribution of other renal drug transporters is elusive. Here, cisplatin-induced toxicity was evaluated in human-derived conditionally immortalized proximal tubule epithelial cells (ciPTEC) expressing renal drug transporters, including OCT2 and organic anion transporters 1 (OAT1) or 3 (OAT3). Parent ciPTEC demonstrated OCT2-dependent cisplatin toxicity (TC50 34 ± 1 μM after 24-hour exposure), as determined by cell viability. Overexpression of OAT1 and OAT3 resulted in reduced sensitivity to cisplatin (TC50 45 ± 6 and 64 ± 11 μM after 24-hour exposure, respectively). This effect was independent of OAT-mediated transport, as the OAT substrates probenecid and diclofenac did not influence cytotoxicity. Decreased cisplatin sensitivity in OAT-expressing cells was associated directly with a trend toward reduced intracellular cisplatin accumulation, explained by reduced OCT2 gene expression and activity. This was evaluated by Vmax of the OCT2-model substrate ASP+ (23.5 ± 0.1, 13.1 ± 0.3, and 21.6 ± 0.6 minutes-1 in ciPTEC-parent, ciPTEC-OAT1, and ciPTEC-OAT3, respectively). Although gene expression of cisplatin efflux transporter multidrug and toxin extrusion 1 (MATE1) was 16.2 ± 0.3-fold upregulated in ciPTEC-OAT1 and 6.1 ± 0.7-fold in ciPTEC-OAT3, toxicity was unaffected by the MATE substrate pyrimethamine, suggesting that MATE1 does not play a role in the current experimental set-up. In conclusion, OAT expression results in reduced cisplatin sensitivity in renal proximal tubule cells, explained by reduced OCT2-mediated uptake capacity. In vitro drug-induced toxicity studies should consider models that express both OCT and OAT drug transporters.
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Affiliation(s)
- Tom T G Nieskens
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Janny G P Peters
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Dina Dabaghie
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Daphne Korte
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Katja Jansen
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Alexander H Van Asbeck
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Neslihan N Tavraz
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Thomas Friedrich
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Frans G M Russel
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Rosalinde Masereeuw
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
| | - Martijn J Wilmer
- Department of Pharmacology and Toxicology, Radboud Institute for Molecular Life Sciences, Radboudumc, Nijmegen, The Netherlands (T.T.G.N., J.G.P.P., D.D., D.K., K.J., A.H.V.A., F.G.M.R., M.J.W.); Department of Physical Chemistry/Bioenergetics, Institute of Chemistry PC14, Technical University of Berlin, Berlin, Germany (N.N.T., T.F.); and Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht, The Netherlands (K.J., R.M.)
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Plössl K, Royer M, Bernklau S, Tavraz NN, Friedrich T, Wild J, Weber BHF, Friedrich U. Retinoschisin is linked to retinal Na/K-ATPase signaling and localization. Mol Biol Cell 2017; 28:2178-2189. [PMID: 28615319 PMCID: PMC5531734 DOI: 10.1091/mbc.e17-01-0064] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 06/02/2017] [Accepted: 06/06/2017] [Indexed: 01/30/2023] Open
Abstract
Retinoschisin binds to the extracellular domain of Na/K-ATPase subunit β2. Retinoschisin inhibits Na/K-ATPase–associated signaling cascades and affects Na/K-ATPase localization. The retinoschisin-Na/K-ATPase complex overlaps with signaling mediators. Defective Na/K-ATPase signaling by retinoschisin deficiency may promote retinal dystrophy. Mutations in the RS1 gene cause X-linked juvenile retinoschisis (XLRS), a hereditary retinal dystrophy. We recently showed that retinoschisin, the protein encoded by RS1, regulates ERK signaling and apoptosis in retinal cells. In this study, we explored an influence of retinoschisin on the functionality of the Na/K-ATPase, its interaction partner at retinal plasma membranes. We show that retinoschisin binding requires the β2-subunit of the Na/K-ATPase, whereas the α-subunit is exchangeable. Our investigations revealed no effect of retinoschisin on Na/K-ATPase–mediated ATP hydrolysis and ion transport. However, we identified an influence of retinoschisin on Na/K-ATPase–regulated signaling cascades and Na/K-ATPase localization. In addition to the known ERK deactivation, retinoschisin treatment of retinoschisin-deficient (Rs1h-/Y) murine retinal explants decreased activation of Src, an initial transmitter in Na/K-ATPase signal transduction, and of Ca2+ signaling marker Camk2. Immunohistochemistry on murine retinae revealed an overlap of the retinoschisin–Na/K-ATPase complex with proteins involved in Na/K-ATPase signaling, such as caveolin, phospholipase C, Src, and the IP3 receptor. Finally, retinoschisin treatment altered Na/K-ATPase localization in photoreceptors of Rs1h-/Y retinae. Taken together, our results suggest a regulatory effect of retinoschisin on Na/K-ATPase signaling and localization, whereas Na/K-ATPase-dysregulation caused by retinoschisin deficiency could represent an initial step in XLRS pathogenesis.
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Affiliation(s)
- Karolina Plössl
- Institute of Human Genetics, University of Regensburg, 93053 Regensburg, Germany
| | - Melanie Royer
- Institute of Human Genetics, University of Regensburg, 93053 Regensburg, Germany
| | - Sarah Bernklau
- Institute of Human Genetics, University of Regensburg, 93053 Regensburg, Germany
| | - Neslihan N Tavraz
- Institute of Chemistry, Technical University of Berlin, 10623 Berlin, Germany
| | - Thomas Friedrich
- Institute of Chemistry, Technical University of Berlin, 10623 Berlin, Germany
| | - Jens Wild
- Institute of Clinical Microbiology and Hygiene, University Hospital of Regensburg, University of Regensburg, 93053 Regensburg, Germany
| | - Bernhard H F Weber
- Institute of Human Genetics, University of Regensburg, 93053 Regensburg, Germany
| | - Ulrike Friedrich
- Institute of Human Genetics, University of Regensburg, 93053 Regensburg, Germany
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