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Zou W, Shi B, Zeng T, Zhang Y, Huang B, Ouyang B, Cai Z, Liu M. Drug Transporters in the Kidney: Perspectives on Species Differences, Disease Status, and Molecular Docking. Front Pharmacol 2021; 12:746208. [PMID: 34912216 PMCID: PMC8666590 DOI: 10.3389/fphar.2021.746208] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 10/27/2021] [Indexed: 01/09/2023] Open
Abstract
The kidneys are a pair of important organs that excretes endogenous waste and exogenous biological agents from the body. Numerous transporters are involved in the excretion process. The levels of these transporters could affect the pharmacokinetics of many drugs, such as organic anion drugs, organic cationic drugs, and peptide drugs. Eleven drug transporters in the kidney (OAT1, OAT3, OATP4C1, OCT2, MDR1, BCRP, MATE1, MATE2-K, OAT4, MRP2, and MRP4) have become necessary research items in the development of innovative drugs. However, the levels of these transporters vary between different species, sex-genders, ages, and disease statuses, which may lead to different pharmacokinetics of drugs. Here, we review the differences of the important transports in the mentioned conditions, in order to help clinicians to improve clinical prescriptions for patients. To predict drug-drug interactions (DDIs) caused by renal drug transporters, the molecular docking method is used for rapid screening of substrates or inhibitors of the drug transporters. Here, we review a large number of natural products that represent potential substrates and/or inhibitors of transporters by the molecular docking method.
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Affiliation(s)
- Wei Zou
- Changsha Research and Development Center on Obstetric and Gynecologic Traditional Chinese Medicine Preparation, NHC Key Laboratory of Birth Defects Research, Prevention and Treatment, Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China
| | - Birui Shi
- Biopharmaceutics, NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
| | - Ting Zeng
- Changsha Research and Development Center on Obstetric and Gynecologic Traditional Chinese Medicine Preparation, NHC Key Laboratory of Birth Defects Research, Prevention and Treatment, Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China
| | - Yan Zhang
- Biopharmaceutics, NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
| | - Baolin Huang
- Biopharmaceutics, NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
| | - Bo Ouyang
- Changsha Research and Development Center on Obstetric and Gynecologic Traditional Chinese Medicine Preparation, NHC Key Laboratory of Birth Defects Research, Prevention and Treatment, Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China
| | - Zheng Cai
- Biopharmaceutics, NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China.,TCM-Integrated Hospital, Southern Medical University, Guangzhou, China
| | - Menghua Liu
- Biopharmaceutics, NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China.,TCM-Integrated Hospital, Southern Medical University, Guangzhou, China
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2
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Phillips JA, Grandhi TSP, Davis M, Gautier JC, Hariparsad N, Keller D, Sura R, Van Vleet TR. A pharmaceutical industry perspective on microphysiological kidney systems for evaluation of safety for new therapies. LAB ON A CHIP 2020; 20:468-476. [PMID: 31989145 DOI: 10.1039/c9lc00925f] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The human kidney contains approximately one million nephrons. As the functional unit of the kidney, the nephron affords an opportunity to approximate the kidney at a microphysiological scale. Recent emergence of physiologically accurate human tissue models has radically advanced the possibilities of mimicking organ biology and multi-organ combinations in vitro. Anatomically, the nephron is one of the most complex, sequentially integrated microfluidic units in the body making the miniaturized microfluidic systems excellent candidates for capturing the kidney biology in vitro. While these models are promising, there are a number of considerations for practical implementation into a drug development paradigm. Opportunities for pharmaceutical industry applications of new MPS models often start with drug safety testing. As such, the intent of this article is to focus on safety and ADME applications. This article reviews biological functions of the kidney and options for characterizing known roles in nephrotoxicity. The concept of "context-of-use" is introduced as a framework for describing and verifying the specific features of an MPS platform for use in drug development. Overall, we present a perspective on key attributes of microphysiological kidney models, which the pharmaceutical industry could leverage to improve confident safety and ADME evaluations of experimental therapies.
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Affiliation(s)
| | - Taraka Sai Pavan Grandhi
- The Genomics Institute of the Novartis Research Foundation, 10675 John J Hopkins Drive, San Diego, CA 92121, USA
| | - Myrtle Davis
- Bristol-Myers Squibb Company, Province Line Road, Princeton, New Jersey 08648, USA
| | | | | | - Douglas Keller
- Sanofi US, 55 Corporate Drive, Bridgewater, NJ 08807, USA
| | - Radhakrishna Sura
- Preclinical Safety, AbbVie, 1 Waukegan Rd, N Chicago, IL 60064, USA.
| | - Terry R Van Vleet
- Preclinical Safety, AbbVie, 1 Waukegan Rd, N Chicago, IL 60064, USA.
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3
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Fowler S, Chen WLK, Duignan DB, Gupta A, Hariparsad N, Kenny JR, Lai WG, Liras J, Phillips JA, Gan J. Microphysiological systems for ADME-related applications: current status and recommendations for system development and characterization. LAB ON A CHIP 2020; 20:446-467. [PMID: 31932816 DOI: 10.1039/c9lc00857h] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Over the last decade, progress has been made on the development of microphysiological systems (MPS) for absorption, distribution, metabolism, and excretion (ADME) applications. Central to this progress has been proof of concept data generated by academic and industrial institutions followed by broader characterization studies, which provide evidence for scalability and applicability to drug discovery and development. In this review, we describe some of the advances made for specific tissue MPS and outline the desired functionality for such systems, which are likely to make them applicable for practical use in the pharmaceutical industry. Single organ MPS platforms will be valuable for modelling tissue-specific functions. However, dynamic organ crosstalk, especially in the context of disease or toxicity, can only be obtained with the use of inter-linked MPS models which will enable scientists to address questions at the intersection of pharmacokinetics (PK) and efficacy, or PK and toxicity. In the future, successful application of MPS platforms that closely mimic human physiology may ultimately reduce the need for animal models to predict ADME outcomes and decrease the overall risk and cost associated with drug development.
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Affiliation(s)
- Stephen Fowler
- Pharma Research and Early Development, F.Hoffmann-La Roche Ltd, Grenzacherstrasse 124, CH4070, Basel, Switzerland
| | | | - David B Duignan
- Department of Drug Metabolism, Pharmacokinetics & Bioanalysis, AbbVie Bioresearch Center, Worcester, Massachusetts 01605, USA
| | - Anshul Gupta
- Amgen Research, 360 Binney St, Cambridge, MA 02141, USA
| | - Niresh Hariparsad
- Department of Drug Metabolism and Pharmacokinetics, Vertex Pharmaceuticals, 50 Northern Ave, Boston, MA, USA
| | - Jane R Kenny
- DMPK, Genentech, 1 DNA Way, South San Francisco 94080, USA
| | | | - Jennifer Liras
- Medicine Design, Pfizer Inc, 1 Portland Ave, Cambridge, MA 02139, USA
| | | | - Jinping Gan
- Pharmaceutical Candidate Optimization, Bristol-Myers Squibb R&D, PO Box 4000, Princeton, NJ 08543-4000, USA.
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4
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Protein Abundance of Clinically Relevant Drug Transporters in The Human Kidneys. Int J Mol Sci 2019; 20:ijms20215303. [PMID: 31653114 PMCID: PMC6862022 DOI: 10.3390/ijms20215303] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 10/21/2019] [Accepted: 10/22/2019] [Indexed: 12/13/2022] Open
Abstract
Renal drug transporters such as the organic cation transporters (OCTs), organic anion transporters (OATs) and multidrug resistance proteins (MRPs) play an important role in the tubular secretion of many drugs influencing their efficacy and safety. However, only little is known about the distinct protein abundance of these transporters in human kidneys, and about the impact of age and gender as potential factors of inter-subject variability in their expression and function. The aim of this study was to determine the protein abundance of MDR1, MRP1-4, BCRP, OAT1-3, OCT2-3, MATE1, PEPT1/2, and ORCTL2 by liquid chromatography-tandem mass spectrometry-based targeted proteomics in a set of 36 human cortex kidney samples (20 males, 16 females; median age 53 and 55 years, respectively). OAT1 and 3, OCT2 and ORCTL2 were found to be most abundant renal SLC transporters while MDR1, MRP1 and MRP4 were the dominating ABC transporters. Only the expression levels of MDR1 and ORCTL2 were significantly higher abundant in older donors. Moreover, we found several significant correlations between different transporters, which may indicate their functional interplay in renal vectorial transport processes. Our data may contribute to a better understanding of the molecular processes determining renal excretion of drugs.
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Brosseau N, Ramotar D. The human organic cation transporter OCT1 and its role as a target for drug responses. Drug Metab Rev 2019; 51:389-407. [PMID: 31564168 DOI: 10.1080/03602532.2019.1670204] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The human organic cation uptake transporter OCT1, encoded by the SLC22A1 gene, is highly expressed in the liver and reported to possess a broad substrate specificity. OCT1 operates by facilitated diffusion and allows the entry of nutrients into cells. Recent findings revealed that OCT1 can mediate the uptake of drugs for treating various diseases such as cancers. The levels of OCT1 expression correlate with the responses towards many drugs and functionally defective OCT1 lead to drug resistance. It has been recently proposed that OCT1 should be amongst the crucial drug targets used for pharmacogenomic analyses. Several single nucleotide polymorphisms exist and are distributed across the entire OCT1 gene. While there are differences in the OCT1 gene polymorphisms between populations, there are at least five variants that warrant consideration in any genetic screen. To date, and despite two decades of research into OCT1 functional role, it still remains uncertain what are the define substrates for this uptake transporter, although studies from mice revealed that one of the substrates is vitamin B1. It is also unclear how OCT1 recognizes a broad array of ligands and whether this involves specific modifications and interactions with other proteins. In this review, we highlight the current findings related to OCT1 with the aim of propelling further studies on this key uptake transporter.
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Affiliation(s)
- Nicolas Brosseau
- Department of Medicine, Maisonneuve-Rosemont Hospital, Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Dindial Ramotar
- Department of Medicine, Maisonneuve-Rosemont Hospital, Research Center, Université de Montréal, Montréal, Québec, Canada
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6
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Nigam SK. The SLC22 Transporter Family: A Paradigm for the Impact of Drug Transporters on Metabolic Pathways, Signaling, and Disease. Annu Rev Pharmacol Toxicol 2019; 58:663-687. [PMID: 29309257 DOI: 10.1146/annurev-pharmtox-010617-052713] [Citation(s) in RCA: 148] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The SLC22 transporter family consists of more than two dozen members, which are expressed in the kidney, the liver, and other tissues. Evolutionary analysis indicates that SLC22 transporters fall into at least six subfamilies: OAT (organic anion transporter), OAT-like, OAT-related, OCT (organic cation transporter), OCTN (organic cation/carnitine transporter), and OCT/OCTN-related. Some-including OAT1 [SLC22A6 or NKT (novel kidney transporter)] and OAT3 (SLC22A8), as well as OCT1 (SLC22A1) and OCT2 (SLC22A2)-are widely studied drug transporters. Nevertheless, analyses of knockout mice and other data indicate that SLC22 transporters regulate key metabolic pathways and levels of signaling molecules (e.g., gut microbiome products, bile acids, tricarboxylic acid cycle intermediates, dietary flavonoids and other nutrients, prostaglandins, vitamins, short-chain fatty acids, urate, and ergothioneine), as well as uremic toxins associated with chronic kidney disease. Certain SLC22 transporters-such as URAT1 (SLC22A12) and OCTN2 (SLC22A5)-are mutated in inherited metabolic diseases. A new systems biology view of transporters is emerging. As proposed in the remote sensing and signaling hypothesis, SLC22 transporters, together with other SLC and ABC transporters, have key roles in interorgan and interorganism small-molecule communication and, together with the neuroendocrine, growth factor-cytokine, and other homeostatic systems, regulate local and whole-body homeostasis.
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Affiliation(s)
- Sanjay K Nigam
- Departments of Pediatrics and Medicine, University of California, San Diego, La Jolla, California 92093, USA;
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7
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Investigation of non-linear Mate1-mediated efflux of trimethoprim in the mouse kidney as the mechanism underlying drug-drug interactions between trimethoprim and organic cations in the kidney. Drug Metab Pharmacokinet 2019; 34:87-94. [DOI: 10.1016/j.dmpk.2018.08.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 07/01/2018] [Accepted: 08/20/2018] [Indexed: 01/30/2023]
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Deutsch B, Neumeister C, Schwantes U, Fromm MF, König J. Interplay of the Organic Cation Transporters OCT1 and OCT2 with the Apically Localized Export Protein MATE1 for the Polarized Transport of Trospium. Mol Pharm 2019; 16:510-517. [PMID: 30656943 DOI: 10.1021/acs.molpharmaceut.8b00779] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The anticholinergic drug trospium is secreted into urine and, to a smaller extent, into bile. Chemically, it is an organic cation, and it is a substrate of the uptake transporters OCT1 and OCT2 as well as for the export proteins MATE1 and MATE2-K as determined in uptake studies using HEK293 cells. So far, neither MATE-mediated export nor the interplay of OCT-mediated uptake and MATE-mediated export have been investigated. Therefore, we used polarized monolayers of single- and double-transfected MDCKII cells (MDCK-OCT1, MDCK-OCT2, MDCK-MATE1, MDCK-OCT1-MATE1, and MDCK-OCT2-MATE1) and the respective control cells (MDCK-Co) for transcellular transport assays. We demonstrate that the transcellular, basal-to-apical transport of trospium is significantly higher in all cell lines compared to control cells over nearly the complete concentration range tested. The transcellular transport mediated by double-transfected MDCK-OCT1-MATE1 and MDCK-OCT2-MATE1 exceeded that in the single-transfected cells (MDCK-OCT1-MATE1 vs MDCK-OCT1: 2.2-fold; MDCK-OCT1-MATE1 vs MDCK-MATE1: 1.7-fold; MDCK-OCT2-MATE1 vs MDCK-OCT2: 6.1-fold; MDCK-OCT2-MATE1 vs MDCK-MATE1: 1.8-fold at a trospium concentration of 1.0 μM; p < 0.001 each). Thus, we show that MATE1 does not only mediate the uptake of trospium into HEK293 cells but also the efflux of trospium out of polarized MDCKII-cells. Furthermore, our results indicate that OCT1 or OCT2 as uptake transporters and MATE1 as an export protein contribute to the transcellular transport of trospium at concentrations normally reached during trospium therapy. These data suggest that both, OCT-mediated uptake as well as MATE1-mediated efflux may contribute to trospium renal and biliary elimination.
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Affiliation(s)
- Birgit Deutsch
- Institute of Experimental and Clinical Pharmacology and Toxicology , Friedrich-Alexander-Universität Erlangen-Nürnberg , 91054 Erlangen , Germany
| | | | | | - Martin F Fromm
- Institute of Experimental and Clinical Pharmacology and Toxicology , Friedrich-Alexander-Universität Erlangen-Nürnberg , 91054 Erlangen , Germany
| | - Jörg König
- Institute of Experimental and Clinical Pharmacology and Toxicology , Friedrich-Alexander-Universität Erlangen-Nürnberg , 91054 Erlangen , Germany
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9
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Müller F, Weitz D, Mertsch K, König J, Fromm MF. Importance of OCT2 and MATE1 for the Cimetidine-Metformin Interaction: Insights from Investigations of Polarized Transport in Single- And Double-Transfected MDCK Cells with a Focus on Perpetrator Disposition. Mol Pharm 2018; 15:3425-3433. [PMID: 29975542 DOI: 10.1021/acs.molpharmaceut.8b00416] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Cimetidine decreases the renal clearance of metformin by inhibition of renal tubular cation transport, and the underlying molecular mechanisms are still not fully understood. We investigated polarized metformin transport without and with the addition of cimetidine as well as polarized cimetidine transport in double-transfected MDCK-OCT2-MATE1 cells that mimic organic cation transport processes in proximal renal tubule cells and in MDCK vector control and single-transfected MDCK-OCT2 and MDCK-MATE1 cells. At all tested concentrations (1, 10, 100 μM), the intracellular accumulation of cimetidine after administration to the basal compartment was considerably higher in MDCK-OCT2 cells compared to that in all other cells ( p < 0.001). Whereas cimetidine transcellular, basal-to-apical transport was only slightly higher in MDCK-OCT2 cells, the presence of MATE1 in the apical membrane caused a pronounced translocation of cimetidine in both single- and double-transfected cells ( p < 0.001). Transcellular, basal-to-apical metformin net transport was reduced by 89.1, 74.5, and 91.0% in MDCK-OCT2-MATE1 cells after the addition of cimetidine (100 μM) to the basal, the apical, or both compartments ( p < 0.001). In MDCK-MATE1 and MDCK-OCT2-MATE1 cells, transcellular net transport of metformin was inhibited by cimetidine with IC50 values of 8.0 and 6.6 μM, respectively. Our data confirm the relevance of MATE1 and suggest the relevance of OCT2 for the cimetidine-metformin interaction, primarily because OCT2 mediates uptake of the perpetrator cimetidine into renal proximal tubular cells and thereby to the site of the metformin exporter MATE1. This work supports the notion that a thorough understanding of transporter-mediated drug-drug interactions may require investigations on the impact of transporters on cellular uptake and transcellular transport of victim as well as perpetrator drugs.
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Affiliation(s)
- Fabian Müller
- Institute of Experimental and Clinical Pharmacology and Toxicology , Friedrich-Alexander-Universität Erlangen-Nürnberg , Fahrstrasse 17 , 91054 Erlangen , Germany
| | - Dietmar Weitz
- R&D, Drug Metabolism and Pharmacokinetics , Sanofi-Aventis Deutschland GmbH , 65926 Frankfurt am Main , Germany
| | - Katharina Mertsch
- R&D, Drug Metabolism and Pharmacokinetics , Sanofi-Aventis Deutschland GmbH , 65926 Frankfurt am Main , Germany
| | - Jörg König
- Institute of Experimental and Clinical Pharmacology and Toxicology , Friedrich-Alexander-Universität Erlangen-Nürnberg , Fahrstrasse 17 , 91054 Erlangen , Germany
| | - Martin F Fromm
- Institute of Experimental and Clinical Pharmacology and Toxicology , Friedrich-Alexander-Universität Erlangen-Nürnberg , Fahrstrasse 17 , 91054 Erlangen , Germany
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10
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Müller F, Weitz D, Derdau V, Sandvoss M, Mertsch K, König J, Fromm MF. Contribution of MATE1 to Renal Secretion of the NMDA Receptor Antagonist Memantine. Mol Pharm 2017; 14:2991-2998. [PMID: 28708400 DOI: 10.1021/acs.molpharmaceut.7b00179] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The weak base memantine is actively secreted into urine, however the underlying mechanisms are insufficiently understood. Potential candidates involved in memantine renal secretion are organic cation transporter 2 (OCT2) and multidrug and toxin extrusion proteins (MATE1, MATE2-K). The aim of this in vitro study was the examination of the interaction of memantine with OCT2 and MATEs. Memantine transporter inhibition and transport were examined in HEK cells expressing human OCT2, MATE1, or MATE2-K. Monolayers of single- (MDCK-OCT2, MDCK-MATE1) and double-transfected MDCK cells (MDCK-OCT2-MATE1) were used for studies on vectorial, basal to apical memantine transport. Memantine inhibited OCT2-, MATE1-, and MATE2-K-mediated metformin transport with IC50 values of 3.2, 40.9, and 315.3 μM, respectively. In HEK cells, no relevant memantine uptake by OCT2, MATE1, or MATE2-K was detected. Vectorial transport experiments, however, indicated a role of MATE1 for memantine export: After memantine administration to the basal side of the monolayers, memantine cellular accumulation was considerably lower (MDCK-MATE1 vs MDCK control cells, P < 0.01) and memantine transcellular, basal to apical transport was higher in MATE1 expressing cells (MDCK-MATE1 vs MDCK control cells, P < 0.001 at 60 and 180 min). Both effects were abolished upon addition of the MATE inhibitor cimetidine. These experiments suggest a relevant role of MATE1 for renal secretion of memantine. In the clinical setting, renal elimination of memantine could be impaired by coadministration of MATE inhibitors.
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Affiliation(s)
- Fabian Müller
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg , Fahrstrasse 17, 91054 Erlangen, Germany
| | - Dietmar Weitz
- R&D, Drug Metabolism and Pharmacokinetics, Sanofi-Aventis Deutschland GmbH , 65926 Frankfurt am Main, Germany
| | - Volker Derdau
- R&D, Integrated Drug Discovery, Sanofi-Aventis Deutschland GmbH , 65926 Frankfurt am Main, Germany
| | - Martin Sandvoss
- R&D, Integrated Drug Discovery, Sanofi-Aventis Deutschland GmbH , 65926 Frankfurt am Main, Germany
| | - Katharina Mertsch
- R&D, Drug Metabolism and Pharmacokinetics, Sanofi-Aventis Deutschland GmbH , 65926 Frankfurt am Main, Germany
| | - Jörg König
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg , Fahrstrasse 17, 91054 Erlangen, Germany
| | - Martin F Fromm
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg , Fahrstrasse 17, 91054 Erlangen, Germany
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Gormsen LC, Sundelin EI, Jensen JB, Vendelbo MH, Jakobsen S, Munk OL, Hougaard Christensen MM, Brøsen K, Frøkiær J, Jessen N. In Vivo Imaging of Human 11C-Metformin in Peripheral Organs: Dosimetry, Biodistribution, and Kinetic Analyses. J Nucl Med 2016; 57:1920-1926. [PMID: 27469359 DOI: 10.2967/jnumed.116.177774] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 06/18/2016] [Indexed: 12/25/2022] Open
Abstract
Metformin is the most widely prescribed oral antiglycemic drug, with few adverse effects. However, surprisingly little is known about its human biodistribution and target tissue metabolism. In animal experiments, we have shown that metformin can be labeled by 11C and that 11C-metformin PET can be used to measure renal function. Here, we extend these preclinical findings by a first-in-human 11C-metformin PET dosimetry, biodistribution, and tissue kinetics study. METHODS Nine subjects (3 women and 6 men) participated in 2 studies: in the first study, human radiation dosimetry and biodistribution of 11C-metformin were estimated in 4 subjects (2 women and 2 men) by whole-body PET. In the second study, 11C-metformin tissue kinetics were measured in response to both intravenous and oral radiotracer administration. A dynamic PET scan with a field of view covering target tissues of metformin (liver, kidneys, intestines, and skeletal muscle) was obtained for 90 (intravenous) and 120 (oral) min. RESULTS Radiation dosimetry was acceptable, with effective doses of 9.5 μSv/MBq (intravenous administration) and 18.1 μSv/MBq (oral administration). Whole-body PET revealed that 11C-metformin was primarily taken up by the kidneys, urinary bladder, and liver but also to a lesser extent in salivary glands, skeletal muscle, and intestines. Reversible 2-tissue-compartment kinetics was observed in the liver, and volume of distribution was calculated to be 2.45 mL/mL (arterial input) or 2.66 mL/mL (portal and arterial input). In the kidneys, compartmental models did not adequately fit the experimental data, and volume of distribution was therefore estimated by a linear approach to be 6.83 mL/mL. Skeletal muscle and intestinal tissue kinetics were best described by 2-tissue-compartment kinetics and showed only discrete tracer uptake. Liver 11C-metformin uptake was pronounced after oral administration of the tracer, with tissue-to-blood ratio double what was observed after intravenous administration. Only slow accumulation of 11C-metformin was observed in muscle. There was no elimination of 11C-metformin through the bile both during the intravenous and during the oral part of the study. CONCLUSION 11C-metformin is suitable for imaging metformin uptake in target tissues and may prove a valuable tool to assess the impact of metformin treatment in patients with varying metformin transport capacity.
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Affiliation(s)
- Lars C Gormsen
- Department of Nuclear Medicine & PET Center, Aarhus University Hospital, Aarhus, Denmark
| | | | - Jonas Brorson Jensen
- Department of Nuclear Medicine & PET Center, Aarhus University Hospital, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Mikkel Holm Vendelbo
- Department of Nuclear Medicine & PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Steen Jakobsen
- Department of Nuclear Medicine & PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Ole Lajord Munk
- Department of Nuclear Medicine & PET Center, Aarhus University Hospital, Aarhus, Denmark
| | | | - Kim Brøsen
- Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark.,Department of Public Health, Clinical Pharmacology, University of Southern Denmark, Odense, Denmark; and
| | - Jørgen Frøkiær
- Department of Nuclear Medicine & PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Niels Jessen
- Department of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark.,Department of Clinical Pharmacology, Aarhus University Hospital, Aarhus, Denmark
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12
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Hyrsova L, Smutny T, Trejtnar F, Pavek P. Expression of organic cation transporter 1 (OCT1): unique patterns of indirect regulation by nuclear receptors and hepatospecific gene regulation. Drug Metab Rev 2016; 48:139-58. [DOI: 10.1080/03602532.2016.1188936] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Lucie Hyrsova
- Department of Pharmacology and Toxicology, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Hradec Kralove, Czech Republic
| | - Tomas Smutny
- Department of Pharmacology and Toxicology, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Hradec Kralove, Czech Republic
| | - Frantisek Trejtnar
- Department of Pharmacology and Toxicology, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Hradec Kralove, Czech Republic
| | - Petr Pavek
- Department of Pharmacology and Toxicology, Faculty of Pharmacy in Hradec Kralove, Charles University in Prague, Hradec Kralove, Czech Republic
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13
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Gai Y, Liu Z, Cervantes-Sandoval I, Davis RL. Drosophila SLC22A Transporter Is a Memory Suppressor Gene that Influences Cholinergic Neurotransmission to the Mushroom Bodies. Neuron 2016; 90:581-95. [PMID: 27146270 DOI: 10.1016/j.neuron.2016.03.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 02/04/2016] [Accepted: 03/15/2016] [Indexed: 10/22/2022]
Abstract
The mechanisms that constrain memory formation are of special interest because they provide insights into the brain's memory management systems and potential avenues for correcting cognitive disorders. RNAi knockdown in the Drosophila mushroom body neurons (MBn) of a newly discovered memory suppressor gene, Solute Carrier DmSLC22A, a member of the organic cation transporter family, enhances olfactory memory expression, while overexpression inhibits it. The protein localizes to the dendrites of the MBn, surrounding the presynaptic terminals of cholinergic afferent fibers from projection neurons (Pn). Cell-based expression assays show that this plasma membrane protein transports cholinergic compounds with the highest affinity among several in vitro substrates. Feeding flies choline or inhibiting acetylcholinesterase in Pn enhances memory, an effect blocked by overexpression of the transporter in the MBn. The data argue that DmSLC22A is a memory suppressor protein that limits memory formation by helping to terminate cholinergic neurotransmission at the Pn:MBn synapse.
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Affiliation(s)
- Yunchao Gai
- Department of Neuroscience, The Scripps Research Institute Florida, Jupiter, FL 33458, USA
| | - Ze Liu
- Department of Neuroscience, The Scripps Research Institute Florida, Jupiter, FL 33458, USA
| | | | - Ronald L Davis
- Department of Neuroscience, The Scripps Research Institute Florida, Jupiter, FL 33458, USA.
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Jakobsen S, Busk M, Jensen JB, Munk OL, Zois NE, Alstrup AKO, Jessen N, Frøkiær J. A PET Tracer for Renal Organic Cation Transporters, ¹¹C-Metformin: Radiosynthesis and Preclinical Proof-of-Concept Studies. J Nucl Med 2016; 57:615-21. [PMID: 26769859 DOI: 10.2967/jnumed.115.169292] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 12/17/2015] [Indexed: 12/28/2022] Open
Abstract
UNLABELLED Organic cation transporters (OCTs) in the kidney proximal tubule (PT) participate in renal excretion of drugs and endogenous compounds. PT function is commonly impaired in kidney diseases, and consequently quantitative measurement of OCT function may provide an important estimate of kidney function. Metformin is a widely used drug and targets OCT type 2 located in the PT. Thus, we hypothesized that (11)C-labeled metformin would be a suitable PET tracer for quantification of renal function. METHODS (11)C-metformin was prepared by (11)C-methylation of 1-methylbiguanide. In vitro cell uptake of (11)C-metformin was studied in LLC-PK1 cells in the presence of increasing doses of unlabeled metformin. In vivo small-animal PET studies in Sprague-Dawley rats were performed at baseline and after treatment with OCT inhibitors to evaluate renal uptake of (11)C-metformin. Kidney and liver pharmacokinetics of (11)C-metformin was investigated in vivo by dynamic (11)C-metformin PET/CT in 6 anesthetized pigs, and renal clearance of (11)C-metformin was compared with renal clearance of (51)Cr-ethylenediaminetetraacetic acid (EDTA). Formation of (11)C metabolites was investigated by analysis of blood and urine samples. RESULTS The radiochemical yield of (11)C-metformin was 15% ± 3% (n= 40, decay-corrected), and up to 1.5 GBq of tracer were produced with a radiochemical purity greater than 95% in less than 30 min. Dose-dependent uptake of (11)C-metformin in LLC-PK1 cells was rapid. Rat small-animal PET images showed (11)C-metformin uptake in the kidney and liver, the kinetics of which were changed after challenging animals with OCT inhibitors. In pigs, 80% of the injected metformin dose was rapidly present in the kidney, and a high dose of metformin caused a delayed renal uptake and clearance compared with baseline consistent with transporter-mediated competition. Renal clearance of (11)C-metformin was approximately 3 times the renal clearance of (51)Cr-EDTA. CONCLUSION We successfully synthesized an (11)C-metformin tracer, and PET studies in rats and pigs showed a rapid kidney uptake from the blood and excretion into the bladder similar to other radiopharmaceuticals developed for γ-camera renography.
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Affiliation(s)
| | - Morten Busk
- Department of Experimental Oncology, Aarhus University Hospital, Aarhus, Denmark; and
| | - Jonas Brorson Jensen
- PET Center, Aarhus University Hospital, Aarhus, Denmark Department of Clinical Medicine, Aarhus University, Denmark
| | | | | | | | - Niels Jessen
- Department of Clinical Medicine, Aarhus University, Denmark
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Ayala-Lopez N, Jackson WF, Burnett R, Wilson JN, Thompson JM, Watts SW. Organic cation transporter 3 contributes to norepinephrine uptake into perivascular adipose tissue. Am J Physiol Heart Circ Physiol 2015; 309:H1904-14. [PMID: 26432838 PMCID: PMC4698381 DOI: 10.1152/ajpheart.00308.2015] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 09/30/2015] [Indexed: 12/23/2022]
Abstract
Perivascular adipose tissue (PVAT) reduces vasoconstriction to norepinephrine (NE). A mechanism by which PVAT could function to reduce vascular contraction is by decreasing the amount of NE to which the vessel is exposed. PVATs from male Sprague-Dawley rats were used to test the hypothesis that PVAT has a NE uptake mechanism. NE was detected by HPLC in mesenteric PVAT and isolated adipocytes. Uptake of NE (10 μM) in mesenteric PVAT was reduced by the NE transporter (NET) inhibitor nisoxetine (1 μM, 73.68 ± 7.62%, all values reported as percentages of vehicle), the 5-hydroxytryptamine transporter (SERT) inhibitor citalopram (100 nM) with the organic cation transporter 3 (OCT3) inhibitor corticosterone (100 μM, 56.18 ± 5.21%), and the NET inhibitor desipramine (10 μM) with corticosterone (100 μM, 61.18 ± 6.82%). Aortic PVAT NE uptake was reduced by corticosterone (100 μM, 53.01 ± 10.96%). Confocal imaging of mesenteric PVAT stained with 4-[4-(dimethylamino)-styrl]-N-methylpyridinium iodide (ASP(+)), a fluorescent substrate of cationic transporters, detected ASP(+) uptake into adipocytes. ASP(+) (2 μM) uptake was reduced by citalopram (100 nM, 66.68 ± 6.43%), corticosterone (100 μM, 43.49 ± 10.17%), nisoxetine (100 nM, 84.12 ± 4.24%), citalopram with corticosterone (100 nM and 100 μM, respectively, 35.75 ± 4.21%), and desipramine with corticosterone (10 and 100 μM, respectively, 50.47 ± 5.78%). NET protein was not detected in mesenteric PVAT adipocytes. Expression of Slc22a3 (OCT3 gene) mRNA and protein in PVAT adipocytes was detected by RT-PCR and immunocytochemistry, respectively. These end points support the presence of a transporter-mediated NE uptake system within PVAT with a potential mediator being OCT3.
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Affiliation(s)
- Nadia Ayala-Lopez
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan; and
| | - William F Jackson
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan; and
| | - Robert Burnett
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan; and
| | - James N Wilson
- Department of Chemistry, University of Miami, Coral Gables, Florida
| | - Janice M Thompson
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan; and
| | - Stephanie W Watts
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan; and
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Pochini L, Scalise M, Indiveri C. Immuno-detection of OCTN1 (SLC22A4) in HeLa cells and characterization of transport function. Int Immunopharmacol 2015; 29:21-6. [DOI: 10.1016/j.intimp.2015.04.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 04/01/2015] [Accepted: 04/17/2015] [Indexed: 11/27/2022]
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Babelova A, Burckhardt BC, Wegner W, Burckhardt G, Henjakovic M. Sex-differences in renal expression of selected transporters and transcription factors in lean and obese Zucker spontaneously hypertensive fatty rats. J Diabetes Res 2015; 2015:483238. [PMID: 25710042 PMCID: PMC4325971 DOI: 10.1155/2015/483238] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 12/22/2014] [Accepted: 12/23/2014] [Indexed: 01/22/2023] Open
Abstract
The aim of this study was to identify sex-dependent expression of renal transporter mRNA in lean and obese Zucker spontaneously hypertensive fatty (ZSF1) rats and to investigate the interaction of the most altered transporter, organic anion transporter 2 (Oat2), with diabetes-relevant metabolites and drugs. Higher incidence of glomerulosclerosis, tubulointerstitial fibrosis, and protein casts in Bowman's space and tubular lumen was detected by PAS staining in obese male compared to female ZSF1 rats. Real-time PCR on RNA isolated from kidney cortex revealed that Sglt1-2, Oat1-3, and Oct1 were higher expressed in kidneys of lean females. Oct2 and Mrp2 were higher expressed in obese males. Renal mRNA levels of transporters were reduced with diabetic nephropathy in females and the expression of transcription factors Hnf1β and Hnf4α in both sexes. The highest difference between lean and obese ZSF1 rats was found for Oat2. Therefore, we have tested the interaction of human OAT2 with various substances using tritium-labeled cGMP. Human OAT2 showed no interaction with diabetes-related metabolites, diabetic drugs, and ACE-inhibitors. However, OAT2-dependent uptake of cGMP was inhibited by furosemide. The strongly decreased expression of Oat2 and other transporters in female diabetic ZSF1 rats could possibly impair renal drug excretion, for example, of furosemide.
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Affiliation(s)
- Andrea Babelova
- Institute for Cardiovascular Physiology (Physiology I), Faculty of Medicine, Goethe-University, Theodor-Stern-Kai 7, 60596 Frankfurt am Main, Germany
- Cancer Research Institute, Slovak Academy of Sciences, Vlarska 7, 83391 Bratislava, Slovakia
| | - Birgitta C. Burckhardt
- Institute for Systemic Physiology and Pathophysiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Waja Wegner
- Institute for Systemic Physiology and Pathophysiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Gerhard Burckhardt
- Institute for Systemic Physiology and Pathophysiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Maja Henjakovic
- Institute for Systemic Physiology and Pathophysiology, University Medical Center Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
- *Maja Henjakovic:
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N1-methylnicotinamide as an endogenous probe for drug interactions by renal cation transporters: studies on the metformin–trimethoprim interaction. Eur J Clin Pharmacol 2014; 71:85-94. [DOI: 10.1007/s00228-014-1770-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 10/07/2014] [Indexed: 10/24/2022]
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Hagos Y, Wegner W, Kuehne A, Floerl S, Marada VV, Burckhardt G, Henjakovic M. HNF4α Induced Chemosensitivity to Oxaliplatin and 5-FU Mediated by OCT1 and CNT3 in Renal Cell Carcinoma. J Pharm Sci 2014; 103:3326-34. [DOI: 10.1002/jps.24128] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 07/11/2014] [Accepted: 07/31/2014] [Indexed: 12/16/2022]
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Li X, Sun X, Chen J, Lu Y, Zhang Y, Wang C, Li J, Zhang Q, Zhao D, Chen X. Investigation of the role of organic cation transporter 2 (OCT2) in the renal transport of guanfacine, a selective α2A-adrenoreceptor agonist. Xenobiotica 2014; 45:88-94. [DOI: 10.3109/00498254.2014.949904] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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