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Ronaldson PT, Williams EI, Betterton RD, Stanton JA, Nilles KL, Davis TP. CNS Drug Delivery in Stroke: Improving Therapeutic Translation From the Bench to the Bedside. Stroke 2024; 55:190-202. [PMID: 38134249 PMCID: PMC10752297 DOI: 10.1161/strokeaha.123.043764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2023]
Abstract
Drug development for ischemic stroke is challenging as evidenced by the paucity of therapeutics that have advanced beyond a phase III trial. There are many reasons for this lack of clinical translation including factors related to the experimental design of preclinical studies. Often overlooked in therapeutic development for ischemic stroke is the requirement of effective drug delivery to the brain, which is critical for neuroprotective efficacy of several small and large molecule drugs. Advancing central nervous system drug delivery technologies implies a need for detailed comprehension of the blood-brain barrier (BBB) and neurovascular unit. Such knowledge will permit the innate biology of the BBB/neurovascular unit to be leveraged for improved bench-to-bedside translation of novel stroke therapeutics. In this review, we will highlight key aspects of BBB/neurovascular unit pathophysiology and describe state-of-the-art approaches for optimization of central nervous system drug delivery (ie, passive diffusion, mechanical opening of the BBB, liposomes/nanoparticles, transcytosis, intranasal drug administration). Additionally, we will discuss how endogenous BBB transporters represent the next frontier of drug delivery strategies for stroke. Overall, this review will provide cutting edge perspective on how central nervous system drug delivery must be considered for the advancement of new stroke drugs toward human trials.
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Affiliation(s)
- Patrick T. Ronaldson
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
- Graduate Interdisciplinary Program in Neuroscience, University of Arizona, Tucson, AZ, USA
| | - Erica I. Williams
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
| | - Robert D. Betterton
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
| | - Joshua A. Stanton
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
| | - Kelsy L. Nilles
- Graduate Interdisciplinary Program in Neuroscience, University of Arizona, Tucson, AZ, USA
| | - Thomas P. Davis
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
- Graduate Interdisciplinary Program in Neuroscience, University of Arizona, Tucson, AZ, USA
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Ronaldson PT, Davis TP. Blood-brain barrier transporters: a translational consideration for CNS delivery of neurotherapeutics. Expert Opin Drug Deliv 2024; 21:71-89. [PMID: 38217410 PMCID: PMC10842757 DOI: 10.1080/17425247.2024.2306138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 01/12/2024] [Indexed: 01/15/2024]
Abstract
INTRODUCTION Successful neuropharmacology requires optimization of CNS drug delivery and, by extension, free drug concentrations at brain molecular targets. Detailed assessment of blood-brain barrier (BBB) physiological characteristics is necessary to achieve this goal. The 'next frontier' in CNS drug delivery is targeting BBB uptake transporters, an approach that requires evaluation of brain endothelial cell transport processes so that effective drug accumulation and improved therapeutic efficacy can occur. AREAS COVERED BBB permeability of drugs is governed by tight junction protein complexes (i.e., physical barrier) and transporters/enzymes (i.e., biochemical barrier). For most therapeutics, a component of blood-to-brain transport involves passive transcellular diffusion. Small molecule drugs that do not possess acceptable physicochemical characteristics for passive permeability may utilize putative membrane transporters for CNS uptake. While both uptake and efflux transport mechanisms are expressed at the brain microvascular endothelium, uptake transporters can be targeted for optimization of brain drug delivery and improved treatment of neurological disease states. EXPERT OPINION Uptake transporters represent a unique opportunity to optimize brain drug delivery by leveraging the endogenous biology of the BBB. A rigorous understanding of these transporters is required to improve translation from the bench to clinical trials and stimulate the development of new treatment paradigms for neurological diseases.
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Affiliation(s)
| | - Thomas P. Davis
- Department of Pharmacology, University of Arizona College of Medicine
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Hau RK, Wright SH, Cherrington NJ. Drug Transporters at the Human Blood-Testis Barrier. Drug Metab Dispos 2023; 51:560-571. [PMID: 36732077 PMCID: PMC10158500 DOI: 10.1124/dmd.122.001186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 01/06/2023] [Accepted: 01/26/2023] [Indexed: 02/04/2023] Open
Abstract
Transporters are involved in the movement of many physiologically important molecules across cell membranes and have a substantial impact on the pharmacological and toxicological effect of xenobiotics. Many transporters have been studied in the context of disposition to, or toxicity in, organs such as the kidney and liver; however, transporters in the testes are increasingly gaining recognition for their role in drug transport across the blood-testis barrier (BTB). The BTB is an epithelial membrane barrier formed by adjacent Sertoli cells (SCs) in the seminiferous tubules that form intercellular junctional complexes to protect developing germ cells from the external environment. Consequently, many charged or large polar molecules cannot cross this barrier without assistance from a transporter. SCs express a variety of drug uptake and efflux transporters to control the flux of endogenous and exogenous molecules across the BTB. Recent studies have identified several transport pathways in SCs that allow certain drugs to circumvent the human BTB. These pathways may exist in other species, such as rodents and nonhuman primates; however, there is (1) a lack of information on their expression and/or localization in these species, and (2) conflicting reports on localization of some transporters that have been evaluated in rodents compared with humans. This review outlines the current knowledge on the expression and localization of pharmacologically relevant drug transporters in human testes and calls attention to the insufficient and contradictory understanding of testicular transporters in other species that are commonly used in drug disposition and toxicity studies. SIGNIFICANCE STATEMENT: While the expression, localization, and function of many xenobiotic transporters have been studied in organs such as the kidney and liver, the characterization of transporters in the testes is scarce. This review summarizes the expression and localization of common pharmacologically-relevant transporters in human testes that have significant implications for the development of drugs that can cross the blood-testis barrier. Potential expression differences between humans and rodents highlighted here suggest rodents may be inappropriate for some testicular disposition and toxicity studies.
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Affiliation(s)
- Raymond K Hau
- College of Pharmacy, Department of Pharmacology & Toxicology (R.K.H., N.J.C.) and College of Medicine, Department of Physiology (S.H.W.), The University of Arizona, Tucson, Arizona
| | - Stephen H Wright
- College of Pharmacy, Department of Pharmacology & Toxicology (R.K.H., N.J.C.) and College of Medicine, Department of Physiology (S.H.W.), The University of Arizona, Tucson, Arizona
| | - Nathan J Cherrington
- College of Pharmacy, Department of Pharmacology & Toxicology (R.K.H., N.J.C.) and College of Medicine, Department of Physiology (S.H.W.), The University of Arizona, Tucson, Arizona
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Uddin ME, Eisenmann ED, Li Y, Huang KM, Garrison DA, Talebi Z, Gibson AA, Jin Y, Nepal M, Bonilla IM, Fu Q, Sun X, Millar A, Tarasov M, Jay CE, Cui X, Einolf HJ, Pelis RM, Smith SA, Radwański PB, Sweet DH, König J, Fromm MF, Carnes CA, Hu S, Sparreboom A. MATE1 Deficiency Exacerbates Dofetilide-Induced Proarrhythmia. Int J Mol Sci 2022; 23:8607. [PMID: 35955741 PMCID: PMC9369325 DOI: 10.3390/ijms23158607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 07/30/2022] [Accepted: 07/30/2022] [Indexed: 02/04/2023] Open
Abstract
Dofetilide is a rapid delayed rectifier potassium current inhibitor widely used to prevent the recurrence of atrial fibrillation and flutter. The clinical use of this drug is associated with increases in QTc interval, which predispose patients to ventricular cardiac arrhythmias. The mechanisms involved in the disposition of dofetilide, including its movement in and out of cardiomyocytes, remain unknown. Using a xenobiotic transporter screen, we identified MATE1 (SLC47A1) as a transporter of dofetilide and found that genetic knockout or pharmacological inhibition of MATE1 in mice was associated with enhanced retention of dofetilide in cardiomyocytes and increased QTc prolongation. The urinary excretion of dofetilide was also dependent on the MATE1 genotype, and we found that this transport mechanism provides a mechanistic basis for previously recorded drug-drug interactions of dofetilide with various contraindicated drugs, including bictegravir, cimetidine, ketoconazole, and verapamil. The translational significance of these observations was examined with a physiologically-based pharmacokinetic model that adequately predicted the drug-drug interaction liabilities in humans. These findings support the thesis that MATE1 serves a conserved cardioprotective role by restricting excessive cellular accumulation and warrant caution against the concurrent administration of potent MATE1 inhibitors and cardiotoxic substrates with a narrow therapeutic window.
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Affiliation(s)
- Muhammad Erfan Uddin
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Eric D. Eisenmann
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Yang Li
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Kevin M. Huang
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Dominique A. Garrison
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Zahra Talebi
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Alice A. Gibson
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Yan Jin
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Mahesh Nepal
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Ingrid M. Bonilla
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA;
| | - Qiang Fu
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Xinxin Sun
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
| | - Alec Millar
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (A.M.); (M.T.); (P.B.R.); (C.A.C.); (S.H.)
| | - Mikhail Tarasov
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (A.M.); (M.T.); (P.B.R.); (C.A.C.); (S.H.)
| | - Christopher E. Jay
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA; (C.E.J.); (D.H.S.)
| | - Xiaoming Cui
- Novartis Institute for Biomedical Research, East Hanover, NJ 07936, USA; (X.C.); (H.J.E.); (R.M.P.)
| | - Heidi J. Einolf
- Novartis Institute for Biomedical Research, East Hanover, NJ 07936, USA; (X.C.); (H.J.E.); (R.M.P.)
| | - Ryan M. Pelis
- Novartis Institute for Biomedical Research, East Hanover, NJ 07936, USA; (X.C.); (H.J.E.); (R.M.P.)
| | - Sakima A. Smith
- OSU Wexner Medical Center, Department of Internal Medicine, Division of Cardiovascular Medicine, The Ohio State University, Columbus, OH 43210, USA;
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
| | - Przemysław B. Radwański
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (A.M.); (M.T.); (P.B.R.); (C.A.C.); (S.H.)
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
| | - Douglas H. Sweet
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA; (C.E.J.); (D.H.S.)
| | - Jörg König
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany; (J.K.); (M.F.F.)
| | - Martin F. Fromm
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany; (J.K.); (M.F.F.)
| | - Cynthia A. Carnes
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (A.M.); (M.T.); (P.B.R.); (C.A.C.); (S.H.)
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
- Division of Pharmacy Practice and Science, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA
| | - Shuiying Hu
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (A.M.); (M.T.); (P.B.R.); (C.A.C.); (S.H.)
| | - Alex Sparreboom
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (E.D.E.); (Y.L.); (K.M.H.); (D.A.G.); (Z.T.); (A.A.G.); (Y.J.); (M.N.); (Q.F.); (X.S.)
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Transport Mechanisms at the Blood–Brain Barrier and in Cellular Compartments of the Neurovascular Unit: Focus on CNS Delivery of Small Molecule Drugs. Pharmaceutics 2022; 14:pharmaceutics14071501. [PMID: 35890396 PMCID: PMC9324459 DOI: 10.3390/pharmaceutics14071501] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/13/2022] [Accepted: 07/15/2022] [Indexed: 02/06/2023] Open
Abstract
Ischemic stroke is a primary origin of morbidity and mortality in the United States and around the world. Indeed, several research projects have attempted to discover new drugs or repurpose existing therapeutics to advance stroke pharmacotherapy. Many of these preclinical stroke studies have reported positive results for neuroprotective agents; however, only one compound (3K3A-activated protein C (3K3A-APC)) has advanced to Phase III clinical trial evaluation. One reason for these many failures is the lack of consideration of transport mechanisms at the blood–brain barrier (BBB) and neurovascular unit (NVU). These endogenous transport processes function as a “gateway” that is a primary determinant of efficacious brain concentrations for centrally acting drugs. Despite the knowledge that some neuroprotective agents (i.e., statins and memantine) are substrates for these endogenous BBB transporters, preclinical stroke studies have largely ignored the role of transporters in CNS drug disposition. Here, we review the current knowledge on specific BBB transporters that either limit drug uptake into the brain (i.e., ATP-binding cassette (ABC) transporters) or can be targeted for optimized drug delivery (i.e., solute carrier (SLC) transporters). Additionally, we highlight the current knowledge on transporter expression in astrocytes, microglia, pericytes, and neurons with an emphasis on transport mechanisms in these cell types that can influence drug distribution within the brain.
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Blood-Brain Barrier Transporters: Opportunities for Therapeutic Development in Ischemic Stroke. Int J Mol Sci 2022; 23:ijms23031898. [PMID: 35163820 PMCID: PMC8836701 DOI: 10.3390/ijms23031898] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 12/20/2022] Open
Abstract
Globally, stroke is a leading cause of death and long-term disability. Over the past decades, several efforts have attempted to discover new drugs or repurpose existing therapeutics to promote post-stroke neurological recovery. Preclinical stroke studies have reported successes in identifying novel neuroprotective agents; however, none of these compounds have advanced beyond a phase III clinical trial. One reason for these failures is the lack of consideration of blood-brain barrier (BBB) transport mechanisms that can enable these drugs to achieve efficacious concentrations in ischemic brain tissue. Despite the knowledge that drugs with neuroprotective properties (i.e., statins, memantine, metformin) are substrates for endogenous BBB transporters, preclinical stroke research has not extensively studied the role of transporters in central nervous system (CNS) drug delivery. Here, we review current knowledge on specific BBB uptake transporters (i.e., organic anion transporting polypeptides (OATPs in humans; Oatps in rodents); organic cation transporters (OCTs in humans; Octs in rodents) that can be targeted for improved neuroprotective drug delivery. Additionally, we provide state-of-the-art perspectives on how transporter pharmacology can be integrated into preclinical stroke research. Specifically, we discuss the utility of in vivo stroke models to transporter studies and considerations (i.e., species selection, co-morbid conditions) that will optimize the translational success of stroke pharmacotherapeutic experiments.
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Amiloride is a suitable fluorescent substrate for the study of the drug transporter human multidrug and toxin extrusion 1 (MATE1). Biochem Biophys Res Commun 2022; 592:113-118. [PMID: 35042121 DOI: 10.1016/j.bbrc.2022.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 01/06/2022] [Indexed: 11/24/2022]
Abstract
Human multidrug and toxin extrusion 1 (MATE1; SLC47A1) is highly expressed in the kidneys and the liver. It plays a significant role in drug and endogenous compound disposition, and therefore, a rapid evaluation of its inhibition is important for drug development and for the understanding of renal and hepatic physiology. Amiloride is a potassium-sparing diuretic used for treating hypertension; it also demonstrates strong fluorescence in organic solvent or detergent solutions. In this study, we investigated the transport characteristics of amiloride by human MATE1. Cellular accumulation of amiloride was evaluated in control vector- or MATE1-transfected HEK293 cells. Cells were lysed with 1% sodium dodecyl sulfate, and fluorescence was measured using a microplate reader at wavelengths of 364ex and 409em. With ammonium prepulse-induced intracellular acidification, MATE1 transported amiloride at an extracellular pH of 7.4. The uptake demonstrated an overshoot phenomenon and saturated, with the Km and Vmax being 23.5 μM and 1.01 nmol/mg/min, respectively. MATE1-mediated amiloride transport also presented with a bell-shaped pH profile that reached a maximum pH value of 7.4. The inhibitor sensitivity of MATE1-facilitated amiloride transport was similar to those of known substrates, such as tetraethylammonium and metformin. Among the tested inhibitors, pyrimethamine demonstrated the most potent inhibition with an IC50 value of 0.266 μM. Furthermore, MATE1 was found to be inhibited by fampridine, which was previously considered to be a non-inhibitor of MATE1. This study demonstrates that amiloride is a suitable fluorescent substrate for the in vitro study of the transport activity of MATE1.
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Uddin ME, Talebi Z, Chen S, Jin Y, Gibson AA, Noonan AM, Cheng X, Hu S, Sparreboom A. In Vitro and In Vivo Inhibition of MATE1 by Tyrosine Kinase Inhibitors. Pharmaceutics 2021; 13:pharmaceutics13122004. [PMID: 34959286 PMCID: PMC8707461 DOI: 10.3390/pharmaceutics13122004] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 12/16/2022] Open
Abstract
The membrane transport of many cationic prescription drugs depends on facilitated transport by organic cation transporters of which several members, including OCT2 (SLC22A2), are sensitive to inhibition by select tyrosine kinase inhibitors (TKIs). We hypothesized that TKIs may differentially interact with the renal transporter MATE1 (SLC47A1) and influence the elimination and toxicity of the MATE1 substrate oxaliplatin. Interactions with FDA-approved TKIs were evaluated in transfected HEK293 cells, and in vivo pharmacokinetic studies were performed in wild-type, MATE1-deficient, and OCT2/MATE1-deficient mice. Of 57 TKIs evaluated, 37 potently inhibited MATE1 function by >80% through a non-competitive, reversible, substrate-independent mechanism. The urinary excretion of oxaliplatin was reduced by about 2-fold in mice with a deficiency of MATE1 or both OCT2 and MATE1 (p < 0.05), without impacting markers of acute renal injury. In addition, genetic or pharmacological inhibition of MATE1 did not significantly alter plasma levels of oxaliplatin, suggesting that MATE1 inhibitors are unlikely to influence the safety or drug-drug interaction liability of oxaliplatin-based chemotherapy.
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Affiliation(s)
- Muhammad Erfan Uddin
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (Z.T.); (Y.J.); (A.A.G.)
| | - Zahra Talebi
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (Z.T.); (Y.J.); (A.A.G.)
| | - Sijie Chen
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (S.C.); (X.C.)
| | - Yan Jin
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (Z.T.); (Y.J.); (A.A.G.)
| | - Alice A. Gibson
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (Z.T.); (Y.J.); (A.A.G.)
| | - Anne M. Noonan
- Department of Internal Medicine, Division of Medical Oncology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA;
| | - Xiaolin Cheng
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (S.C.); (X.C.)
| | - Shuiying Hu
- Division of Outcomes and Translational Sciences, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA;
| | - Alex Sparreboom
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA; (M.E.U.); (Z.T.); (Y.J.); (A.A.G.)
- Correspondence:
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The structure of the Aquifex aeolicus MATE family multidrug resistance transporter and sequence comparisons suggest the existence of a new subfamily. Proc Natl Acad Sci U S A 2021; 118:2107335118. [PMID: 34753818 DOI: 10.1073/pnas.2107335118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2021] [Indexed: 11/18/2022] Open
Abstract
Multidrug and toxic compound extrusion (MATE) transporters are widespread in all domains of life. Bacterial MATE transporters confer multidrug resistance by utilizing an electrochemical gradient of H+ or Na+ to export xenobiotics across the membrane. Despite the availability of X-ray structures of several MATE transporters, a detailed understanding of the transport mechanism has remained elusive. Here we report the crystal structure of a MATE transporter from Aquifex aeolicus at 2.0-Å resolution. In light of its phylogenetic placement outside of the diversity of hitherto-described MATE transporters and the lack of conserved acidic residues, this protein may represent a subfamily of prokaryotic MATE transporters, which was proven by phylogenetic analysis. Furthermore, the crystal structure and substrate docking results indicate that the substrate binding site is located in the N bundle. The importance of residues surrounding this binding site was demonstrated by structure-based site-directed mutagenesis. We suggest that Aq_128 is functionally similar but structurally diverse from DinF subfamily transporters. Our results provide structural insights into the MATE transporter, which further advances our global understanding of this important transporter family.
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Du Z, Su Q, Wu Z, Huang Z, Bao J, Li J, Tu H, Zeng C, Fu J, He H. Genome-wide characterization of MATE gene family and expression profiles in response to abiotic stresses in rice (Oryza sativa). BMC Ecol Evol 2021; 21:141. [PMID: 34243710 PMCID: PMC8268253 DOI: 10.1186/s12862-021-01873-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 06/29/2021] [Indexed: 01/09/2023] Open
Abstract
Multidrug and toxic compound extrusion (MATE) proteins are involved in many physiological functions of plant growth and development. Although an increasing number of MATE proteins have been identified, the understanding of MATE proteins is still very limited in rice. In this study, 46 MATE proteins were identified from the rice (Oryza sativa) genome by homology searches and domain prediction. The rice MATE family was divided into four subfamilies based on the phylogenetic tree. Tandem repeats and fragment replication contribute to the expansion of the rice MATE gene family. Gene structure and cis-regulatory elements reveal the potential functions of MATE genes. Analysis of gene expression showed that most of MATE genes were constitutively expressed and the expression patterns of genes in different tissues were analyzed using RNA-seq. Furthermore, qRT-PCR-based analysis showed differential expression patterns in response to salt and drought stress. The analysis results of this study provide comprehensive information on the MATE gene family in rice and will aid in understanding the functional divergence of MATE genes.
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Affiliation(s)
- Zhixuan Du
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Qitao Su
- School of Life Sciences, Jinggangshan University, Ji'an, 343009, China
| | - Zheng Wu
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Zhou Huang
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Jianzhong Bao
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Jianbin Li
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Hang Tu
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Chuihai Zeng
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Junru Fu
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China.
| | - Haohua He
- Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Research Center of Super Rice Engineering and Technology, Jiangxi Agricultural University, Nanchang, 330045, China.
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11
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Betterton RD, Davis TP, Ronaldson PT. Organic Cation Transporter (OCT/OCTN) Expression at Brain Barrier Sites: Focus on CNS Drug Delivery. Handb Exp Pharmacol 2021; 266:301-328. [PMID: 33674914 PMCID: PMC8603467 DOI: 10.1007/164_2021_448] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Therapeutic delivery to the central nervous system (CNS) continues to be a considerable challenge in the pharmacological treatment and management of neurological disorders. This is primarily due to the physiological and biochemical characteristics of brain barrier sites (i.e., blood-brain barrier (BBB), blood-cerebrospinal fluid barrier (BCSFB)). Drug uptake into brain tissue is highly restricted by expression of tight junction protein complexes and adherens junctions between brain microvascular endothelial cells and choroid plexus epithelial cells. Additionally, efflux transport proteins expressed at the plasma membrane of these same endothelial and epithelial cells act to limit CNS concentrations of centrally acting drugs. In contrast, facilitated diffusion via transporter proteins allows for substrate-specific flux of molecules across the plasma membrane, directing drug uptake into the CNS. Organic Cation Transporters (OCTs) and Novel Organic Cation Transporters (OCTNs) are two subfamilies of the solute carrier 22 (SLC22) family of proteins that have significant potential to mediate delivery of positively charged, zwitterionic, and uncharged therapeutics. While expression of these transporters has been well characterized in peripheral tissues, the functional expression of OCT and OCTN transporters at CNS barrier sites and their role in delivery of therapeutic drugs to molecular targets in the brain require more detailed analysis. In this chapter, we will review current knowledge on localization, function, and regulation of OCT and OCTN isoforms at the BBB and BCSFB with a particular emphasis on how these transporters can be utilized for CNS delivery of therapeutic agents.
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Affiliation(s)
- Robert D Betterton
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
| | - Thomas P Davis
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
| | - Patrick T Ronaldson
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA.
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12
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Gorecki M, Müller SF, Leidolf R, Geyer J. Trospium Chloride Transport by Mouse Drug Carriers of the Slc22 and Slc47 Families. Int J Mol Sci 2020; 22:ijms22010022. [PMID: 33375004 PMCID: PMC7792585 DOI: 10.3390/ijms22010022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/17/2020] [Accepted: 12/18/2020] [Indexed: 12/21/2022] Open
Abstract
Background: The muscarinic receptor antagonist trospium chloride (TCl) is used for pharmacotherapy of the overactive bladder syndrome. TCl is a hydrophilic positively charged drug. Therefore, it has low permeability through biomembranes and requires drug transporters for distribution and excretion. In humans, the organic cation transporters OCT1 and OCT2 and the multidrug and toxin extrusion MATE1 and MATE2-K carriers showed TCl transport. However, their individual role for distribution and excretion of TCl is unclear. Knockout mouse models lacking mOct1/mOct2 or mMate1 might help to clarify their role for the overall pharmacokinetics of TCl. Method: In preparation of such experiments, TCl transport was analyzed in HEK293 cells stably transfected with the mouse carriers mOct1, mOct2, mMate1, and mMate2, respectively. Results: Mouse mOct1, mOct2, and mMate1 showed significant TCl transport with Km values of 58.7, 78.5, and 29.3 µM, respectively. In contrast, mMate2 did not transport TCl but showed MPP+ transport with Km of 60.0 µM that was inhibited by the drugs topotecan, acyclovir, and levofloxacin. Conclusion: TCl transport behavior as well as expression pattern were quite similar for the mouse carriers mOct1, mOct2, and mMate1 compared to their human counterparts.
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Affiliation(s)
| | | | | | - Joachim Geyer
- Correspondence: ; Tel.: +49-641-99-38404; Fax: +49-641-99-38409
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13
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Kroll T, Prescher M, Smits SHJ, Schmitt L. Structure and Function of Hepatobiliary ATP Binding Cassette Transporters. Chem Rev 2020; 121:5240-5288. [PMID: 33201677 DOI: 10.1021/acs.chemrev.0c00659] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The liver is beyond any doubt the most important metabolic organ of the human body. This function requires an intensive crosstalk within liver cellular structures, but also with other organs. Membrane transport proteins are therefore of upmost importance as they represent the sensors and mediators that shuttle signals from outside to the inside of liver cells and/or vice versa. In this review, we summarize the known literature of liver transport proteins with a clear emphasis on functional and structural information on ATP binding cassette (ABC) transporters, which are expressed in the human liver. These primary active membrane transporters form one of the largest families of membrane proteins. In the liver, they play an essential role in for example bile formation or xenobiotic export. Our review provides a state of the art and comprehensive summary of the current knowledge of hepatobiliary ABC transporters. Clearly, our knowledge has improved with a breath-taking speed over the last few years and will expand further. Thus, this review will provide the status quo and will lay the foundation for new and exciting avenues in liver membrane transporter research.
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Affiliation(s)
- Tim Kroll
- Institute of Biochemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | - Martin Prescher
- Institute of Biochemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | - Sander H J Smits
- Institute of Biochemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.,Center for Structural Studies, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | - Lutz Schmitt
- Institute of Biochemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
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14
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Abstract
The organic cation transporters (OCTs) OCT1, OCT2, OCT3, novel OCT (OCTN)1, OCTN2, multidrug and toxin exclusion (MATE)1, and MATE kidney-specific 2 are polyspecific transporters exhibiting broadly overlapping substrate selectivities. They transport organic cations, zwitterions, and some uncharged compounds and operate as facilitated diffusion systems and/or antiporters. OCTs are critically involved in intestinal absorption, hepatic uptake, and renal excretion of hydrophilic drugs. They modulate the distribution of endogenous compounds such as thiamine, L-carnitine, and neurotransmitters. Sites of expression and functions of OCTs have important impact on energy metabolism, pharmacokinetics, and toxicity of drugs, and on drug-drug interactions. In this work, an overview about the human OCTs is presented. Functional properties of human OCTs, including identified substrates and inhibitors of the individual transporters, are described. Sites of expression are compiled, and data on regulation of OCTs are presented. In addition, genetic variations of OCTs are listed, and data on their impact on transport, drug treatment, and diseases are reported. Moreover, recent data are summarized that indicate complex drug-drug interaction at OCTs, such as allosteric high-affinity inhibition of transport and substrate dependence of inhibitor efficacies. A hypothesis about the molecular mechanism of polyspecific substrate recognition by OCTs is presented that is based on functional studies and mutagenesis experiments in OCT1 and OCT2. This hypothesis provides a framework to imagine how observed complex drug-drug interactions at OCTs arise. Finally, preclinical in vitro tests that are performed by pharmaceutical companies to identify interaction of novel drugs with OCTs are discussed. Optimized experimental procedures are proposed that allow a gapless detection of inhibitory and transported drugs.
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Affiliation(s)
- Hermann Koepsell
- Institute of Anatomy and Cell Biology and Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Würzburg, Würzburg, Germany
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15
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Huang KM, Uddin ME, DiGiacomo D, Lustberg MB, Hu S, Sparreboom A. Role of SLC transporters in toxicity induced by anticancer drugs. Expert Opin Drug Metab Toxicol 2020; 16:493-506. [PMID: 32276560 DOI: 10.1080/17425255.2020.1755253] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION . Membrane transporters are integral to the maintenance of cellular integrity of all tissue and cell types. While transporters play an established role in the systemic pharmacokinetics of therapeutic drugs, tissue specific expression of uptake transporters can serve as an initiating mechanism that governs the accumulation and impact of cytotoxic drugs. AREAS COVERED . This review provides an overview of organic cation transporters as determinants of chemotherapy-induced toxicities. We also provide insights into the recently updated FDA guidelines for in vitro drug interaction studies, with a particular focus on the class of tyrosine kinase inhibitors as perpetrators of transporter-mediated drug interactions. EXPERT OPINION . Studies performed over the last few decades have highlighted the important role of basolateral uptake and apical efflux transporters in the pathophysiology of drug-induced organ damage. Increased understanding of the mechanisms that govern the accumulation of cytotoxic drugs has provided insights into the development of novel strategies to prevent debilitating toxicities. Furthermore, we argue that current regulatory guidelines provide inadequate recommendations for in vitro studies to identify substrates or inhibitors of drug transporters. Therefore, the translational and predictive power of FDA-approved drugs as modulators of transport function remains ambiguous and warrants further revision of the current guidelines.
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Affiliation(s)
- Kevin M Huang
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, the Ohio State University , Columbus, OH, USA
| | - Muhammad Erfan Uddin
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, the Ohio State University , Columbus, OH, USA
| | - Duncan DiGiacomo
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, the Ohio State University , Columbus, OH, USA
| | - Maryam B Lustberg
- Department of Medical Oncology, College of Medicine, the Ohio State University and Comprehensive Cancer Center , Columbus, OH, USA
| | - Shuiying Hu
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, the Ohio State University , Columbus, OH, USA
| | - Alex Sparreboom
- Division of Pharmaceutics and Pharmacology, College of Pharmacy and Comprehensive Cancer Center, the Ohio State University , Columbus, OH, USA
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16
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Sekhar GN, Fleckney AL, Boyanova ST, Rupawala H, Lo R, Wang H, Farag DB, Rahman KM, Broadstock M, Reeves S, Thomas SA. Region-specific blood-brain barrier transporter changes leads to increased sensitivity to amisulpride in Alzheimer's disease. Fluids Barriers CNS 2019; 16:38. [PMID: 31842924 PMCID: PMC6915870 DOI: 10.1186/s12987-019-0158-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 12/02/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Research into amisulpride use in Alzheimer's disease (AD) implicates blood-brain barrier (BBB) dysfunction in antipsychotic sensitivity. Research into BBB transporters has been mainly directed towards the ABC superfamily, however, solute carrier (SLC) function in AD has not been widely studied. This study tests the hypothesis that transporters for organic cations contribute to the BBB delivery of the antipsychotics (amisulpride and haloperidol) and is disrupted in AD. METHODS The accumulation of [3H]amisulpride (3.7-7.7 nM) and [3H]haloperidol (10 nM) in human (hCMEC/D3) and mouse (bEnd.3) brain endothelial cell lines was explored. Computational approaches examined molecular level interactions of both drugs with the SLC transporters [organic cation transporter 1 (OCT1), plasma membrane monoamine transporter (PMAT) and multi-drug and toxic compound extrusion proteins (MATE1)] and amisulpride with the ABC transporter (P-glycoprotein). The distribution of [3H]amisulpride in wildtype and 3×transgenic AD mice was examined using in situ brain perfusion experiments. Western blots determined transporter expression in mouse and human brain capillaries . RESULTS In vitro BBB and in silico transporter studies indicated that [3H]amisulpride and [3H]haloperidol were transported by the influx transporter, OCT1, and efflux transporters MATE1 and PMAT. Amisulpride did not have a strong interaction with OCTN1, OCTN2, P-gp, BCRP or MRP and could not be described as a substrate for these transporters. Amisulpride brain uptake was increased in AD mice compared to wildtype mice, but vascular space was unaffected. There were no measurable changes in the expression of MATE1, MATE2, PMAT OCT1, OCT2, OCT3, OCTN1, OCTN2 and P-gp in capillaries isolated from whole brain homogenates from the AD mice compared to wildtype mice. Although, PMAT and MATE1 expression was reduced in capillaries obtained from specific human brain regions (i.e. putamen and caudate) from AD cases (Braak stage V-VI) compared to age matched controls (Braak stage 0-II). CONCLUSIONS Together our research indicates that the increased sensitivity of individuals with Alzheimer's to amisulpride is related to previously unreported changes in function and expression of SLC transporters at the BBB (in particular PMAT and MATE1). Dose adjustments may be required for drugs that are substrates of these transporters when prescribing for individuals with AD.
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Affiliation(s)
- Gayathri Nair Sekhar
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Alice L Fleckney
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Sevda Tomova Boyanova
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Huzefa Rupawala
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Rachel Lo
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Hao Wang
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Doaa B Farag
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
- Faculty of Pharmacy, Misr International University, Cairo, 11431, Egypt
| | - Khondaker Miraz Rahman
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK
| | - Martin Broadstock
- Wolfson Centre for Age-Related Diseases, King's College London, Guy's Campus, London, SE1 1UL, UK
- Maurice Wohl Clinical Neuroscience Institute, King's College London, 125 Coldharbour Lane, Camberwell, London, SE5 9N, UK
| | - Suzanne Reeves
- Division of Psychiatry, Faculty of Brain Sciences, University College London, 149 Tottenham Court Road, London, W1T 7NF, UK
| | - Sarah Ann Thomas
- Faculty of Life Sciences and Medicine, School of Cancer and Pharmaceutical Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, Waterloo, London, SE1 9NH, UK.
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17
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Min X, Jin X, Liu W, Wei X, Zhang Z, Ndayambaza B, Wang Y. Transcriptome-wide characterization and functional analysis of MATE transporters in response to aluminum toxicity in Medicago sativa L. PeerJ 2019; 7:e6302. [PMID: 30723620 PMCID: PMC6360082 DOI: 10.7717/peerj.6302] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 12/14/2018] [Indexed: 11/20/2022] Open
Abstract
Multidrug and toxic compound extrusion (MATE) transporters contribute to multidrug resistance and play major determinants of aluminum (Al) tolerance in plants. Alfalfa (Medicago sativa L.) is the most extensively cultivated forage crop in the world, yet most alfalfa cultivars are not Al tolerant. The basic knowledge of the MATE transcripts family and the characterisation of specific MATE members involved in alfalfa Al stress remain unclear. In this study, 88 alfalfa MATE (MsMATE) transporters were identified at the whole transcriptome level. Phylogenetic analysis classified them into four subfamilies comprising 11 subgroups. Generally, five kinds of motifs were found in group G1, and most were located at the N-terminus, which might confer these genes with Al detoxification functions. Furthermore, 10 putative Al detoxification-related MsMATE genes were identified and the expression of five genes was significantly increased after Al treatment, indicating that these genes might play important roles in conferring Al tolerance to alfalfa. Considering the limited functional understanding of MATE transcripts in alfalfa, our findings will be valuable for the functional investigation and application of this family in alfalfa.
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Affiliation(s)
- Xueyang Min
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
| | - Xiaoyu Jin
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
| | - Wenxian Liu
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
| | - Xingyi Wei
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
| | - Zhengshe Zhang
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
| | - Boniface Ndayambaza
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
| | - Yanrong Wang
- State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou, P. R. China.,Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou, P. R. China.,Engineering Research Center of Grassland Industry, Ministry of Education, Lanzhou, P. R. China.,College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P. R. China
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18
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Fujita S, Hirota T, Sakiyama R, Baba M, Ieiri I. Identification of drug transporters contributing to oxaliplatin-induced peripheral neuropathy. J Neurochem 2018; 148:373-385. [PMID: 30295925 DOI: 10.1111/jnc.14607] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 06/19/2018] [Accepted: 10/01/2018] [Indexed: 12/23/2022]
Abstract
Oxaliplatin is widely used as a key drug in the treatment of colorectal cancer. However, its administration is associated with the dose-limiting adverse effect, peripheral neuropathy. Platinum accumulation in the dorsal root ganglion (DRG) is the major mechanism responsible for oxaliplatin-induced neuropathy. Some drug transporters have been identified as platinum complex transporters in kidney or tumor cells, but not yet in DRG. In the present study, we investigated oxaliplatin transporters and their contribution to peripheral neuropathy. We identified 12 platinum transporters expressed in DRG with real-time PCR, and their transiently overexpressing cells were established. After exposure to oxaliplatin, the accumulation of platinum in these overexpressing cells was evaluated using a coupled plasma mass spectrometer. Octn1/2- and Mate1-expressing cells showed the intracellular accumulation of oxaliplatin. In an animal study, peripheral neuropathy developed after the administration of oxaliplatin (4 mg/kg, intravenously, twice a week) to siRNA-injected rats (0.5 nmol, intrathecally, once a week) was demonstrated with the von Frey test. The knockdown of Octn1 in DRG ameliorated peripheral neuropathy, and decreased platinum accumulation in DRG, whereas the knockdown of Octn2 did not. Mate1 siRNA-injected rats developed more severe neuropathy than control rats. These results indicate that Octn1 and Mate1 are involved in platinum accumulation at DRG and oxaliplatin-induced peripheral neuropathy.
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Affiliation(s)
- Shunsuke Fujita
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Takeshi Hirota
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Ryo Sakiyama
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Misaki Baba
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Ichiro Ieiri
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
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19
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Lončar J, Smital T. Interaction of environmental contaminants with zebrafish (Danio rerio) multidrug and toxin extrusion protein 7 (Mate7/Slc47a7). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2018; 205:193-203. [PMID: 30396010 DOI: 10.1016/j.aquatox.2018.10.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 10/23/2018] [Accepted: 10/23/2018] [Indexed: 06/08/2023]
Abstract
Zebrafish Mate7 belongs to solute carrier protein superfamily and specifically to subfamily of multidrug and toxin extruders. It is co-orthologous to mammalian Mates, and is ubiquitously expressed in zebrafish tissues with the highest expression in kidney. It has been shown to interact with both endogenous (steroid hormones) and xenobiotic compounds (pharmaceuticals), implying a role in efflux of toxic compounds. The objective of our study was to analyse interaction of environmental contaminants with zebrafish Mate7 using a newly developed high throughput screening (HTS) Mate7 assay. A full-length zebrafish mate7 sequence was obtained from zebrafish cDNA originating from male kidney, and a stable expression of Mate7 in genetically engineered HEK293 Flp-In cells was achieved. Stable Mate7 transfectants were then used for development and optimization of a new HTS cellular uptake protocol, with DAPI and ASP + as model fluorescent substrates. The developed assay was used for identifying zebrafish Mate 7 interactors and discerning the type of interaction. A series of 89 diverse environmental contaminants, including industrial chemicals, pesticides, and pharmaceuticals, was tested and highly effective Mate7 interactors were identified in all of the aforementioned groups. Some of the inhibitors identified could be of environmental concern because they may potentially impair Mate7 efflux function, lowering the fish defence capacity against environmental contaminants, or interfering with transport of yet unidentified physiological substrates. In addition, we found significant differences between zebrafish Mate7 and mammalian Mates' substrate preferences, a finding that should be taken into consideration when using zebrafish as a model organism in toxicokinetic studies.
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Affiliation(s)
- Jovica Lončar
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
| | - Tvrtko Smital
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia.
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20
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Kawasaki T, Matsumoto T, Iwai Y, Kawakami M, Juge N, Omote H, Nabekura T, Moriyama Y. Purification and reconstitution of polyspecific H +/organic cation antiporter human MATE1. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2456-2464. [PMID: 30028956 DOI: 10.1016/j.bbamem.2018.07.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 06/27/2018] [Accepted: 07/11/2018] [Indexed: 01/11/2023]
Abstract
Human MATE1 (multidrug and toxin extrusion 1, hMATE1) is a H+/organic cation (OC) exchanger responsible for the final step of toxic organic cation excretion in the kidney and liver. To investigate the mechanism of transport, we have established an in vitro assay procedure that includes its expression in insect cells, solubilization with octyl glucoside, purification, and reconstitution into liposomes. The resultant proteoliposomes containing hMATE1 as the sole protein component took up radiolabeled tetraethylammonium (TEA) in a ∆pH-dependent and electroneutral fashion. Furthermore, lipid-detergent micelle containing hMATE1 showed ∆pH-dependent TEA binding similar to transport. Mutated hMATE1 with replacement E273Q completely lacked these TEA binding and transport. In the case of divalent substrates, transport was electrogenic. These observations indicate that the stoichiometry of OC/H+ exchange is independent of substrate charge. Purification and reconstitution of hMATE1 is considered to be suitable for understanding the detailed molecular mechanisms of hMATE1. The results suggest that Glu273 of hMATE1 plays essential roles in substrate binding and transport.
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Affiliation(s)
- Tatsuya Kawasaki
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan; Department of Pharmaceutics, School of Pharmacy Aichi Gakuin University, Nagoya 464-8650, Japan.
| | - Takuya Matsumoto
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan
| | - Yuma Iwai
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan
| | - Mamiyo Kawakami
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan
| | - Narinobu Juge
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan
| | - Hiroshi Omote
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan.
| | - Tomohiro Nabekura
- Department of Pharmaceutics, School of Pharmacy Aichi Gakuin University, Nagoya 464-8650, Japan
| | - Yoshinori Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8530, Japan; Department of Biochemistry, Matsumoto Dental University, Shioziri 399-0781, Japan
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Miyauchi H, Moriyama S, Kusakizako T, Kumazaki K, Nakane T, Yamashita K, Hirata K, Dohmae N, Nishizawa T, Ito K, Miyaji T, Moriyama Y, Ishitani R, Nureki O. Structural basis for xenobiotic extrusion by eukaryotic MATE transporter. Nat Commun 2017; 8:1633. [PMID: 29158478 PMCID: PMC5696359 DOI: 10.1038/s41467-017-01541-0] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 09/27/2017] [Indexed: 01/10/2023] Open
Abstract
Mulitidrug and toxic compound extrusion (MATE) family transporters export xenobiotics to maintain cellular homeostasis. The human MATE transporters mediate the excretion of xenobiotics and cationic clinical drugs, whereas some plant MATE transporters are responsible for aluminum tolerance and secondary metabolite transport. Here we report the crystal structure of the eukaryotic MATE transporter from Arabidopsis thaliana, at 2.6 Å resolution. The structure reveals that its carboxy-terminal lobe (C-lobe) contains an extensive hydrogen-bonding network with well-conserved acidic residues, and their importance is demonstrated by the structure-based mutational analysis. The structural and functional analyses suggest that the transport mechanism involves the structural change of transmembrane helix 7, induced by the formation of a hydrogen-bonding network upon the protonation of the conserved acidic residue in the C-lobe. Our findings provide insights into the transport mechanism of eukaryotic MATE transporters, which is important for the improvement of the pharmacokinetics of the clinical drugs. Mulitidrug and toxic compound extrusion (MATE) family transporters export xenobiotics and some plant MATE transporters are involved in secondary metabolite transport. Here, the authors present the structure of the Arabidopsis thaliana MATE transporter AtDTX14 and propose a model for eukaryotic MATE transport mechanism.
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Affiliation(s)
- Hirotake Miyauchi
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Satomi Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, 700-8530, Japan
| | - Tsukasa Kusakizako
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Kaoru Kumazaki
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Takanori Nakane
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | | | - Kunio Hirata
- RIKEN SPring-8 Center, Sayo-gun, Hyogo, 679-5148, Japan
| | - Naoshi Dohmae
- Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, Wako, Saitama, 351-0198, Japan
| | - Tomohiro Nishizawa
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
| | - Koichi Ito
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, 277-8562, Japan
| | - Takaaki Miyaji
- Advanced Science Research Center, Okayama University, Okayama, 700-8530, Japan
| | - Yoshinori Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, 700-8530, Japan
| | - Ryuichiro Ishitani
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan.
| | - Osamu Nureki
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan.
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22
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Vaca E, Behrens C, Theccanat T, Choe JY, Dean JV. Mechanistic differences in the uptake of salicylic acid glucose conjugates by vacuolar membrane-enriched vesicles isolated from Arabidopsis thaliana. PHYSIOLOGIA PLANTARUM 2017; 161:322-338. [PMID: 28665551 DOI: 10.1111/ppl.12602] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 06/15/2017] [Accepted: 06/24/2017] [Indexed: 05/24/2023]
Abstract
Salicylic acid (SA) is a plant hormone involved in a number of physiological responses including both local and systemic resistance of plants to pathogens. In Arabidopsis, SA is glucosylated to form either SA 2-O-β-d-glucose (SAG) or SA glucose ester (SGE). In this study, we show that SAG accumulates in the vacuole of Arabidopsis, while the majority of SGE was located outside the vacuole. The uptake of SAG by vacuolar membrane-enriched vesicles isolated from Arabidopsis was stimulated by the addition of MgATP and was inhibited by both vanadate (ABC transporter inhibitor) and bafilomycin A1 (vacuolar H+ -ATPase inhibitor), suggesting that SAG uptake involves both an ABC transporter and H+ -antiporter. Despite its absence in the vacuole, we observed the MgATP-dependent uptake of SGE by Arabidopsis vacuolar membrane-enriched vesicles. SGE uptake was not inhibited by vanadate but was inhibited by bafilomycin A1 and gramicidin D providing evidence that uptake was dependent on an H+ -antiporter. The uptake of both SAG and SGE was also inhibited by quercetin and verapamil (two known inhibitors of multidrug efflux pumps) and salicin and arbutin. MgATP-dependent SAG and SGE uptake exhibited Michaelis-Menten-type saturation kinetics. The vacuolar enriched-membrane vesicles had a 46-fold greater affinity and a 10-fold greater transport activity with SGE than with SAG. We propose that in Arabidopsis, SAG is transported into the vacuole to serve as a long-term storage form of SA while SGE, although also transported into the vacuole, is easily hydrolyzed to release the active hormone which can then be remobilized to other cellular locations.
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Affiliation(s)
- Elizabeth Vaca
- Department of Biological Sciences, DePaul University, Chicago, IL 60614, USA
| | - Claire Behrens
- Department of Biological Sciences, DePaul University, Chicago, IL 60614, USA
| | - Tiju Theccanat
- Department of Biological Sciences, DePaul University, Chicago, IL 60614, USA
| | - Jun-Yong Choe
- Department of Biochemistry and Molecular Biology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
| | - John V Dean
- Department of Biological Sciences, DePaul University, Chicago, IL 60614, USA
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23
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Santos ALD, Chaves-Silva S, Yang L, Maia LGS, Chalfun-Júnior A, Sinharoy S, Zhao J, Benedito VA. Global analysis of the MATE gene family of metabolite transporters in tomato. BMC PLANT BIOLOGY 2017; 17:185. [PMID: 29084510 PMCID: PMC5663081 DOI: 10.1186/s12870-017-1115-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 10/09/2017] [Indexed: 05/20/2023]
Abstract
BACKGROUND Species in the Solanaceae family are known for producing plethora of specialized metabolites. In addition to biosynthesis pathways, a full comprehension of secondary metabolism must also take into account the transport and subcellular compartmentalization of substances. Here, we examined the MATE (Multidrug and Toxic Compound Extrusion, or Multi-Antimicrobial Extrusion) gene family in the tomato (Solanum lycopersicum) genome with the objective of better understanding the transport of secondary metabolites in this model species. MATE membrane effluxers encompass an ancient gene family of secondary transporters present in all kingdoms of life, but with a remarkable expansion in plants. They mediate the transport of primary and secondary metabolites using the proton motive force through several membrane systems of the cell. RESULTS We identified 67 genes coding for MATE transporters in the tomato genome, 33 of which are expressed constitutively whereas 34 are expressed in specific cell types or environmental conditions. Synteny analyses revealed bona fide paralogs and Arabidopsis orthologs. Co-expression analysis between MATE and regulatory genes revealed 78 positive and 8 negative strong associations (ρ≥|0.8|). We found no evidence of MATE transporters belonging to known metabolic gene clusters in tomato. CONCLUSIONS Altogether, our expression data, phylogenetic analyses, and synteny study provide strong evidence of functional homologies between MATE genes of tomato and Arabidopsis thaliana. Our co-expression study revealed potential transcriptional regulators of MATE genes that warrant further investigation. This work sets the stage for genome-wide functional analyses of MATE transporters in tomato and other Solanaceae species of economic relevance.
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Affiliation(s)
- Adolfo Luís Dos Santos
- Division of Plant and Soil Sciences, West Virginia University, 3425 New Agricultural Sciences Building, Morgantown, WV, 26506-6108, USA
- Plant Molecular Physiology Laboratory, Biology Department, Federal University of Lavras (UFLA), Lavras, MG, Brazil
| | - Samuel Chaves-Silva
- Division of Plant and Soil Sciences, West Virginia University, 3425 New Agricultural Sciences Building, Morgantown, WV, 26506-6108, USA
- Plant Molecular Physiology Laboratory, Biology Department, Federal University of Lavras (UFLA), Lavras, MG, Brazil
| | - Lina Yang
- Division of Plant and Soil Sciences, West Virginia University, 3425 New Agricultural Sciences Building, Morgantown, WV, 26506-6108, USA
| | - Lucas Gontijo Silva Maia
- Division of Plant and Soil Sciences, West Virginia University, 3425 New Agricultural Sciences Building, Morgantown, WV, 26506-6108, USA
| | - Antonio Chalfun-Júnior
- Plant Molecular Physiology Laboratory, Biology Department, Federal University of Lavras (UFLA), Lavras, MG, Brazil
| | - Senjuti Sinharoy
- Department of Biotechnology, University of Calcutta, Kolkata, India
| | - Jian Zhao
- State Key Laboratory of Tea Plant Biology and Utilization, College of Tea and Food Sciences, Anhui Agricultural University, Hefei, 230036, China
| | - Vagner Augusto Benedito
- Division of Plant and Soil Sciences, West Virginia University, 3425 New Agricultural Sciences Building, Morgantown, WV, 26506-6108, USA.
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24
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Abstract
Transporters in proximal renal tubules contribute to the disposition of numerous drugs. Furthermore, the molecular mechanisms of tubular secretion have been progressively elucidated during the past decades. Organic anions tend to be secreted by the transport proteins OAT1, OAT3 and OATP4C1 on the basolateral side of tubular cells, and multidrug resistance protein (MRP) 2, MRP4, OATP1A2 and breast cancer resistance protein (BCRP) on the apical side. Organic cations are secreted by organic cation transporter (OCT) 2 on the basolateral side, and multidrug and toxic compound extrusion (MATE) proteins MATE1, MATE2/2-K, P-glycoprotein, organic cation and carnitine transporter (OCTN) 1 and OCTN2 on the apical side. Significant drug-drug interactions (DDIs) may affect any of these transporters, altering the clearance and, consequently, the efficacy and/or toxicity of substrate drugs. Interactions at the level of basolateral transporters typically decrease the clearance of the victim drug, causing higher systemic exposure. Interactions at the apical level can also lower drug clearance, but may be associated with higher renal toxicity, due to intracellular accumulation. Whereas the importance of glomerular filtration in drug disposition is largely appreciated among clinicians, DDIs involving renal transporters are less well recognized. This review summarizes current knowledge on the roles, quantitative importance and clinical relevance of these transporters in drug therapy. It proposes an approach based on substrate-inhibitor associations for predicting potential tubular-based DDIs and preventing their adverse consequences. We provide a comprehensive list of known drug interactions with renally-expressed transporters. While many of these interactions have limited clinical consequences, some involving high-risk drugs (e.g. methotrexate) definitely deserve the attention of prescribers.
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Affiliation(s)
- Anton Ivanyuk
- Division of Clinical Pharmacology, Lausanne University Hospital (CHUV), Bugnon 17, 1011, Lausanne, Switzerland.
| | - Françoise Livio
- Division of Clinical Pharmacology, Lausanne University Hospital (CHUV), Bugnon 17, 1011, Lausanne, Switzerland
| | - Jérôme Biollaz
- Division of Clinical Pharmacology, Lausanne University Hospital (CHUV), Bugnon 17, 1011, Lausanne, Switzerland
| | - Thierry Buclin
- Division of Clinical Pharmacology, Lausanne University Hospital (CHUV), Bugnon 17, 1011, Lausanne, Switzerland
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25
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Saidijam M, Karimi Dermani F, Sohrabi S, Patching SG. Efflux proteins at the blood-brain barrier: review and bioinformatics analysis. Xenobiotica 2017; 48:506-532. [PMID: 28481715 DOI: 10.1080/00498254.2017.1328148] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
1. Efflux proteins at the blood-brain barrier provide a mechanism for export of waste products of normal metabolism from the brain and help to maintain brain homeostasis. They also prevent entry into the brain of a wide range of potentially harmful compounds such as drugs and xenobiotics. 2. Conversely, efflux proteins also hinder delivery of therapeutic drugs to the brain and central nervous system used to treat brain tumours and neurological disorders. For bypassing efflux proteins, a comprehensive understanding of their structures, functions and molecular mechanisms is necessary, along with new strategies and technologies for delivery of drugs across the blood-brain barrier. 3. We review efflux proteins at the blood-brain barrier, classified as either ATP-binding cassette (ABC) transporters (P-gp, BCRP, MRPs) or solute carrier (SLC) transporters (OATP1A2, OATP1A4, OATP1C1, OATP2B1, OAT3, EAATs, PMAT/hENT4 and MATE1). 4. This includes information about substrate and inhibitor specificity, structural organisation and mechanism, membrane localisation, regulation of expression and activity, effects of diseases and conditions and the principal technique used for in vivo analysis of efflux protein activity: positron emission tomography (PET). 5. We also performed analyses of evolutionary relationships, membrane topologies and amino acid compositions of the proteins, and linked these to structure and function.
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Affiliation(s)
- Massoud Saidijam
- a Department of Molecular Medicine and Genetics , Research Centre for Molecular Medicine, School of Medicine, Hamadan University of Medical Sciences , Hamadan , Iran and
| | - Fatemeh Karimi Dermani
- a Department of Molecular Medicine and Genetics , Research Centre for Molecular Medicine, School of Medicine, Hamadan University of Medical Sciences , Hamadan , Iran and
| | - Sareh Sohrabi
- a Department of Molecular Medicine and Genetics , Research Centre for Molecular Medicine, School of Medicine, Hamadan University of Medical Sciences , Hamadan , Iran and
| | - Simon G Patching
- b School of BioMedical Sciences and the Astbury Centre for Structural Molecular Biology, University of Leeds , Leeds , UK
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26
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Xiao L, Xue Y, Zhang C, Wang L, Lin Y, Pan G. The involvement of multidrug and toxin extrusion protein 1 in the distribution and excretion of berberine. Xenobiotica 2017; 48:314-323. [PMID: 28298174 DOI: 10.1080/00498254.2017.1300707] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
1. Berberine (BBR), an isoquinoline alkaloid, has demonstrated multiple clinical pharmacological actions. As a substrate of multiple transporters in the liver, BBR is rarely excreted into the bile but can be found in the urine. The purpose of the present study was to investigate the role of multidrug and toxin extrusion protein 1 (MATE1) in the transport of BBR in the liver and kidney. 2. Using human MATE1 (hMATE1)-transfected HEK293 cells, BBR was shown to be a substrate of hMATE1 (Km = 4.28 ± 2.18 μM). In primary rat hepatocytes, pH-dependent uptake and efflux studies suggested that the transport of BBR was driven by the exchange of H+ and involved Mate1. In rats, we found that pyrimethamine (PYR), an inhibitor of Mate1, increased hepatic and renal distribution of BBR and decreased systematic excretion of BBR. 3. These findings indicated that BBR is a substrate of MATE1 and that hepatic and renal Mate1 promote excretion of BBR into bile and urine, respectively. In conclusion, Mate1 plays a key role in the distribution and excretion of BBR, and we speculate that drug-drug interactions (DDIs) caused by MATE1 may occur between BBR and other co-administered drugs.
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Affiliation(s)
- Ling Xiao
- a Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China and.,b University of Chinese Academy of Sciences , Beijing , China
| | - Yaru Xue
- a Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China and.,b University of Chinese Academy of Sciences , Beijing , China
| | - Cuifeng Zhang
- a Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China and.,b University of Chinese Academy of Sciences , Beijing , China
| | - Le Wang
- a Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China and.,b University of Chinese Academy of Sciences , Beijing , China
| | - Yunfei Lin
- a Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China and.,b University of Chinese Academy of Sciences , Beijing , China
| | - Guoyu Pan
- a Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China and.,b University of Chinese Academy of Sciences , Beijing , China
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27
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Almukainzi M, Gabr R, Abdelhamid G, Löbenberg R. Mechanistic understanding of the effect of renal impairment on metformin oral absorption using computer simulations. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2017. [DOI: 10.1007/s40005-017-0307-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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28
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Lončar J, Popović M, Krznar P, Zaja R, Smital T. The first characterization of multidrug and toxin extrusion (MATE/SLC47) proteins in zebrafish (Danio rerio). Sci Rep 2016; 6:28937. [PMID: 27357367 PMCID: PMC4928094 DOI: 10.1038/srep28937] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 06/13/2016] [Indexed: 12/13/2022] Open
Abstract
Multidrug and toxin extrusion (MATE) proteins are involved in the extrusion of endogenous compounds and xenobiotics across the plasma membrane. They are conserved from bacteria to mammals, with different numbers of genes within groups. Here, we present the first data on identification and functional characterization of Mate proteins in zebrafish (Danio rerio). Phylogenetic analysis revealed six Mates in teleost fish, annotated as Mate3-8, which form a distinct cluster separated from the tetrapod MATEs/Mates. Synteny analysis showed that zebrafish mate genes are orthologous to human MATEs. Gene expression analysis revealed that all the mate transcripts were constitutively and differentially expressed during embryonic development, followed by pronounced and tissue-specific expression in adults. Functional analyses were performed using transport activity assays with model substrates after heterologous overexpression of five zebrafish Mates in HEK293T cells. The results showed that zebrafish Mates interact with both physiological and xenobiotic substances but also substantially differ with respect to the interacting compounds and interaction strength in comparison to mammalian MATEs/Mates. Taken together, our data clearly indicate a potentially important role for zebrafish Mate transporters in zebrafish embryos and adults and provide a basis for detailed functional characterizations of single zebrafish Mate transporters.
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Affiliation(s)
- Jovica Lončar
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
| | - Marta Popović
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia.,Oxford Institute for Radiation Oncology, University of Oxford, Oxford, England, United Kingdom
| | - Petra Krznar
- Institute of Molecular Systems Biology, ETH Zurich, Switzerland
| | - Roko Zaja
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia.,Sir William Dunn School of Pathology, University of Oxford, Oxford, England, United Kingdom
| | - Tvrtko Smital
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
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29
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Jensen JB, Sundelin EI, Jakobsen S, Gormsen LC, Munk OL, Frøkiær J, Jessen N. [11C]-Labeled Metformin Distribution in the Liver and Small Intestine Using Dynamic Positron Emission Tomography in Mice Demonstrates Tissue-Specific Transporter Dependency. Diabetes 2016; 65:1724-30. [PMID: 26993065 DOI: 10.2337/db16-0032] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 03/09/2016] [Indexed: 11/13/2022]
Abstract
Metformin is the most commonly prescribed oral antidiabetic drug, with well-documented beneficial preventive effects on diabetic complications. Despite being in clinical use for almost 60 years, the underlying mechanisms for metformin action remain elusive. Organic cation transporters (OCT), including multidrug and toxin extrusion proteins (MATE), are essential for transport of metformin across membranes, but tissue-specific activity of these transporters in vivo is incompletely understood. Here, we use dynamic positron emission tomography with [(11)C]-labeled metformin ([(11)C]-metformin) in mice to investigate the role of OCT and MATE in a well-established target tissue, the liver, and a putative target of metformin, the small intestine. Ablation of OCT1 and OCT2 significantly reduced the distribution of metformin in the liver and small intestine. In contrast, inhibition of MATE1 with pyrimethamine caused accumulation of metformin in the liver but did not affect distribution in the small intestine. The demonstration of OCT-mediated transport into the small intestine provides evidence of direct effects of metformin in this tissue. OCT and MATE have important but separate roles in uptake and elimination of metformin in the liver, but this is not due to changes in biliary secretion. [(11)C]-Metformin holds great potential as a tool to determine the pharmacokinetic properties of metformin in clinical studies.
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Affiliation(s)
- Jonas B Jensen
- Research Laboratory for Biochemical Pathology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Elias I Sundelin
- Research Laboratory for Biochemical Pathology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Steen Jakobsen
- Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Lars C Gormsen
- Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Ole L Munk
- Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Jørgen Frøkiær
- Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Niels Jessen
- Research Laboratory for Biochemical Pathology, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark Department of Clinical Pharmacology, Aarhus University Hospital, Aarhus, Denmark
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30
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Structure and function of multidrug and toxin extrusion proteins (MATEs) and their relevance to drug therapy and personalized medicine. Arch Toxicol 2016; 90:1555-84. [PMID: 27165417 DOI: 10.1007/s00204-016-1728-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 04/27/2016] [Indexed: 12/15/2022]
Abstract
Multidrug and toxin extrusion (MATE; SLC47A) proteins are membrane transporters mediating the excretion of organic cations and zwitterions into bile and urine and thereby contributing to the hepatic and renal elimination of many xenobiotics. Transported substrates include creatinine as endogenous substrate, the vitamin thiamine and a number of drug agents with in part chemically different structures such as the antidiabetic metformin, the antiviral agents acyclovir and ganciclovir as well as the antibiotics cephalexin and cephradine. This review summarizes current knowledge on the structural and molecular features of human MATE transporters including data on expression and localization in different tissues, important aspects on regulation and their functional role in drug transport. The role of genetic variation of MATE proteins for drug pharmacokinetics and drug response will be discussed with consequences for personalized medicine.
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31
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Liu J, Li Y, Wang W, Gai J, Li Y. Genome-wide analysis of MATE transporters and expression patterns of a subgroup of MATE genes in response to aluminum toxicity in soybean. BMC Genomics 2016; 17:223. [PMID: 26968518 PMCID: PMC4788864 DOI: 10.1186/s12864-016-2559-8] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Accepted: 02/29/2016] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Multidrug and toxic compound extrusion (MATE) family is an important group of the multidrug efflux transporters that extrude organic compounds, transporting a broad range of substrates such as organic acids, plant hormones and secondary metabolites. However, genome-wide analysis of MATE family in plant species is limited and no such studies have been reported in soybean. RESULTS A total of 117 genes encoding MATE transporters were identified from the whole genome sequence of soybean (Glycine max), which were denominated as GmMATE1 - GmMATE117. These 117 GmMATE genes were unevenly localized on soybean chromosomes 1 to 20, with both tandem and segmental duplication events detected, and most genes showed tissue-specific expression patterns. Soybean MATE family could be classified into four subfamilies comprising ten smaller subgroups, with diverse potential functions such as transport and accumulation of flavonoids or alkaloids, extrusion of plant-derived or xenobiotic compounds, regulation of disease resistance, and response to abiotic stresses. Eight soybean MATE transporters clustered together with the previously reported MATE proteins related to aluminum (Al) detoxification and iron translocation were further analyzed. Seven stress-responsive cis-elements such as ABRE, ARE, HSE, LTR, MBS, as well as a cis-element of ART1 (Al resistance transcription factor 1), GGNVS, were identified in the upstream region of these eight GmMATE genes. Differential gene expression analysis of these eight GmMATE genes in response to Al stress helps us identify GmMATE75 as the candidate gene for Al tolerance in soybean, whose relative transcript abundance increased at 6, 12 and 24 h after Al treatment, with more fold changes in Al-tolerant than Al-sensitive cultivar, which is consistent with previously reported Al-tolerance related MATE genes. CONCLUSIONS A total of 117 MATE transporters were identified in soybean and their potential functions were proposed by phylogenetic analysis with known plant MATE transporters. The cis-elements and expression patterns of eight soybean MATE genes related to Al detoxification/iron translocation were analyzed, and GmMATE75 was identified as a candidate gene for Al tolerance in soybean. This study provides a first insight on soybean MATE family and their potential roles in soybean response to abiotic stresses especially Al toxicity.
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Affiliation(s)
- Juge Liu
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, National Center for Soybean Improvement, Key Laboratory for Biology and Genetic Improvement of Soybean (General, Ministry of Agriculture), Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, 210095 China
| | - Yang Li
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, National Center for Soybean Improvement, Key Laboratory for Biology and Genetic Improvement of Soybean (General, Ministry of Agriculture), Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, 210095 China
| | - Wei Wang
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, National Center for Soybean Improvement, Key Laboratory for Biology and Genetic Improvement of Soybean (General, Ministry of Agriculture), Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, 210095 China
| | - Junyi Gai
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, National Center for Soybean Improvement, Key Laboratory for Biology and Genetic Improvement of Soybean (General, Ministry of Agriculture), Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, 210095 China
| | - Yan Li
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, National Center for Soybean Improvement, Key Laboratory for Biology and Genetic Improvement of Soybean (General, Ministry of Agriculture), Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, 210095 China
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32
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Togawa N, Juge N, Miyaji T, Hiasa M, Omote H, Moriyama Y. Wide expression of type I Na+-phosphate cotransporter 3 (NPT3/SLC17A2), a membrane potential-driven organic anion transporter. Am J Physiol Cell Physiol 2015; 309:C71-80. [PMID: 25972451 DOI: 10.1152/ajpcell.00048.2015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/08/2015] [Indexed: 01/11/2023]
Abstract
Membrane potential (Δψ)-driven and Cl(-)-dependent organic anion transport is a primary function of the solute carrier family 17 (SLC17) transporter family. Although the transport substrates and physiological relevance of the major members are well understood, SLC17A2 protein known to be Na(+)-phosphate cotransporter 3 (NPT3) is far less well characterized. In the present study, we investigated the transport properties and expression patterns of mouse SLC17A2 protein (mNPT3). Proteoliposomes containing the purified mNPT3 protein took up radiolabeled p-aminohippuric acid (PAH) in a Δψ- and Cl(-)-dependent manner. The mNPT3-mediated PAH uptake was inhibited by 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid (DIDs) and Evans blue, common inhibitors of SLC17 family members. The PAH uptake was also inhibited by various anionic compounds, such as hydrophilic nonsteroidal anti-inflammatory drugs (NSAIDs) and urate. Consistent with these observations, the proteoliposome took up radiolabeled urate in a Δψ- and Cl(-)-dependent manner. Immunohistochemistry with specific antibodies against mNPT3 combined with RT-PCR revealed that mNPT3 is present in various tissues, including the hepatic bile duct, luminal membranes of the renal urinary tubules, maternal side of syncytiotrophoblast in the placenta, apical membrane of follicle cells in the thyroid, bronchiole epithelial cells in the lungs, and astrocytes around blood vessels in the cerebrum. These results suggested that mNPT3 is a polyspecific organic anion transporter that is involved in circulation of urate throughout the body.
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Affiliation(s)
- Natsuko Togawa
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Narinobu Juge
- Advanced Science Research Center, Okayama University, Okayama, Japan; and Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Tokyo, Japan
| | - Takaaki Miyaji
- Advanced Science Research Center, Okayama University, Okayama, Japan; and
| | - Miki Hiasa
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Hiroshi Omote
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Yoshinori Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan; Advanced Science Research Center, Okayama University, Okayama, Japan; and
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Ogawa W, Minato Y, Dodan H, Onishi M, Tsuchiya T, Kuroda T. Characterization of MATE-type multidrug efflux pumps from Klebsiella pneumoniae MGH78578. PLoS One 2015; 10:e0121619. [PMID: 25807080 PMCID: PMC4373734 DOI: 10.1371/journal.pone.0121619] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 02/02/2015] [Indexed: 01/04/2023] Open
Abstract
We previously described the cloning of genes related to drug resistance from Klebsiella pneumoniae MGH78578. Of these, we identified a putative gene encoding a MATE-type multidrug efflux pump, and named it ketM. Escherichia coli KAM32 possessing ketM on a plasmid showed increased minimum inhibitory concentrations for norfloxacin, ciprofloxacin, cefotaxime, acriflavine, Hoechst 33342, and 4',6-diamidino-2-phenyl indole (DAPI). The active efflux of DAPI was observed in E. coli KAM32 possessing ketM on a plasmid. The expression of mRNA for ketM was observed in K. pneumoniae cells, and we subsequently disrupted ketM in K. pneumoniae ATCC10031. However, no significant changes were observed in drug resistance levels between the parental strain ATCC10031 and ketM disruptant, SKYM. Therefore, we concluded that KetM was a multidrug efflux pump, that did not significantly contribute to intrinsic resistance to antimicrobial chemicals in K. pneumoniae. MATE-type transporters are considered to be secondary transporters; therefore, we investigated the coupling cations of KetM. DAPI efflux by KetM was observed when lactate was added to produce a proton motive force, indicating that KetM effluxed substrates using a proton motive force. However, the weak efflux of DAPI by KetM was also noted when NaCl was added to the assay mixture without lactate. This result suggests that KetM may utilize proton and sodium motive forces.
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Affiliation(s)
- Wakano Ogawa
- Department of Microbiology and Biochemistry, Daiichi University of Pharmacy, Fukuoka, Japan
- Department of Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
- * E-mail:
| | - Yusuke Minato
- Department of Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Hayata Dodan
- Department of Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Motoyasu Onishi
- Department of Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Tomofusa Tsuchiya
- Department of Microbiology, College of Pharmaceutical Sciences, Ritsumeikan University, Shiga, Japan
| | - Teruo Kuroda
- Department of Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
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Huertas A, Wessinger WD, Kucheryavykh YV, Sanabria P, Eaton MJ, Skatchkov SN, Rojas LV, Maldonado-Martínez G, Inyushin MY. Quinine enhances the behavioral stimulant effect of cocaine in mice. Pharmacol Biochem Behav 2014; 129:26-33. [PMID: 25482328 DOI: 10.1016/j.pbb.2014.11.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 11/25/2014] [Accepted: 11/29/2014] [Indexed: 11/20/2022]
Abstract
The Na(+)-dependent dopamine transporter (DAT) is primarily responsible for regulating free dopamine (DA) concentrations in the brain by participating in the majority of DA uptake; however, other DA transporters may also participate, especially if cocaine or other drugs of abuse compromise DAT. Recently, such cocaine-insensitive low-affinity mono- and poly-amine OCT transporters were described in astrocytes which use DA as a substrate. These transporters are from a different transporter family and while insensitive to cocaine, they are specifically blocked by quinine and some steroids. Quinine is inexpensive and is often found in injected street drugs as an "adulterant". The present study was designed to determine the participation of OCTs in cocaine dependent behavioral and physiological changes in mice. Using FVB mice we showed, that daily single injections of quinine (10 mg/kg, i.p.) co-administered with cocaine (15 mg/kg, i.p.) for 10 days significantly enhanced cocaine-induced locomotor behavioral sensitization. Quinine had no significant effect on the time course of behavioral activation. In astrocytes from the ventral tegmental area of mice, transporter currents of quinine-sensitive monoamine transporters were also augmented after two weeks of cocaine administration. The importance of low-affinity high-capacity transporters for DA clearance is discussed, explaining the known ability of systemically administered DAT inhibitors to anomalously increase DA clearance.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Mikhail Y Inyushin
- Universidad Central del Caribe, School of Medicine, P.O. Box 60-327, Bayamón 00960-6032, Puerto Rico.
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Tega Y, Akanuma SI, Kubo Y, Hosoya KI. Involvement of the H+/Organic Cation Antiporter in Nicotine Transport in Rat Liver. Drug Metab Dispos 2014; 43:89-92. [DOI: 10.1124/dmd.114.061002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Alshogran OY, Naud J, Ocque AJ, Leblond FA, Pichette V, Nolin TD. Effect of experimental kidney disease on the functional expression of hepatic reductases. Drug Metab Dispos 2014; 43:100-6. [PMID: 25332430 DOI: 10.1124/dmd.114.061150] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Chronic kidney disease (CKD) affects the nonrenal clearance of drugs by modulating the functional expression of hepatic drug-metabolizing enzymes and transporters. The impact of CKD on oxidative and conjugative metabolism has been extensively studied. However, its effect on hepatic drug reduction, an important phase I drug-metabolism pathway, has not been investigated. We aimed to assess the effect of experimental CKD on hepatic reduction using warfarin as a pharmacological probe substrate. Cytosolic and microsomal cellular fractions were isolated from liver tissue harvested from five-sixths-nephrectomized and control rats (n = 10 per group). The enzyme kinetics for warfarin reduction were evaluated in both fractions, and formation of warfarin alcohols was used as an indicator of hepatic reductase activity. Selective inhibitors were employed to identify reductases involved in warfarin reduction. Gene and protein expression of reductases were determined using quantitative real-time polymerase chain reaction and Western blotting, respectively. Formation of RS/SR-warfarin alcohol was decreased by 39% (P < 0.001) and 43% (P < 0.01) in cytosol and microsomes, respectively, in CKD rats versus controls. However, RR/SS-warfarin alcohol formation was unchanged in the cytosol, and a trend toward its decreased production was observed in microsomes. Gene and protein expression of cytosolic carbonyl reductase 1 and aldo-keto reductase 1C3/18, and microsomal 11β-hydroxysteroid dehydrogenase type 1 were significantly reduced by >30% (P < 0.05) in CKD rats compared with controls. Collectively, these results suggest that the functional expression of hepatic reductases is selectively decreased in kidney disease. Our findings may explain one mechanism for altered nonrenal clearance, exposure, and response of drugs in CKD patients.
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Affiliation(s)
- Osama Y Alshogran
- Center for Clinical Pharmaceutical Sciences (O.Y.A., A.J.O., T.D.N.), Department of Pharmaceutical Sciences (O.Y.A.) and Department of Pharmacy and Therapeutics (T.D.N.), School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania; and Service de Néphrologie et Centre de Recherche, Hôpital Maisonneuve-Rosemont (J.N., F.A.L., V.P.), Département de Pharmacologie (V.P.), Université de Montréal, Montréal, Québec, Canada
| | - Judith Naud
- Center for Clinical Pharmaceutical Sciences (O.Y.A., A.J.O., T.D.N.), Department of Pharmaceutical Sciences (O.Y.A.) and Department of Pharmacy and Therapeutics (T.D.N.), School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania; and Service de Néphrologie et Centre de Recherche, Hôpital Maisonneuve-Rosemont (J.N., F.A.L., V.P.), Département de Pharmacologie (V.P.), Université de Montréal, Montréal, Québec, Canada
| | - Andrew J Ocque
- Center for Clinical Pharmaceutical Sciences (O.Y.A., A.J.O., T.D.N.), Department of Pharmaceutical Sciences (O.Y.A.) and Department of Pharmacy and Therapeutics (T.D.N.), School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania; and Service de Néphrologie et Centre de Recherche, Hôpital Maisonneuve-Rosemont (J.N., F.A.L., V.P.), Département de Pharmacologie (V.P.), Université de Montréal, Montréal, Québec, Canada
| | - François A Leblond
- Center for Clinical Pharmaceutical Sciences (O.Y.A., A.J.O., T.D.N.), Department of Pharmaceutical Sciences (O.Y.A.) and Department of Pharmacy and Therapeutics (T.D.N.), School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania; and Service de Néphrologie et Centre de Recherche, Hôpital Maisonneuve-Rosemont (J.N., F.A.L., V.P.), Département de Pharmacologie (V.P.), Université de Montréal, Montréal, Québec, Canada
| | - Vincent Pichette
- Center for Clinical Pharmaceutical Sciences (O.Y.A., A.J.O., T.D.N.), Department of Pharmaceutical Sciences (O.Y.A.) and Department of Pharmacy and Therapeutics (T.D.N.), School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania; and Service de Néphrologie et Centre de Recherche, Hôpital Maisonneuve-Rosemont (J.N., F.A.L., V.P.), Département de Pharmacologie (V.P.), Université de Montréal, Montréal, Québec, Canada
| | - Thomas D Nolin
- Center for Clinical Pharmaceutical Sciences (O.Y.A., A.J.O., T.D.N.), Department of Pharmaceutical Sciences (O.Y.A.) and Department of Pharmacy and Therapeutics (T.D.N.), School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania; and Service de Néphrologie et Centre de Recherche, Hôpital Maisonneuve-Rosemont (J.N., F.A.L., V.P.), Département de Pharmacologie (V.P.), Université de Montréal, Montréal, Québec, Canada
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Motohashi H, Inui KI. Multidrug and toxin extrusion family SLC47: physiological, pharmacokinetic and toxicokinetic importance of MATE1 and MATE2-K. Mol Aspects Med 2013; 34:661-8. [PMID: 23506899 DOI: 10.1016/j.mam.2012.11.004] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Accepted: 08/20/2012] [Indexed: 01/11/2023]
Abstract
The kidney plays an important role in the secretion of organic compounds including drugs, toxins and endogeneous metabolites. The renal elimination process of organic cations is mediated by two distinct transport systems expressed on the apical and basolateral membrane of proximal epithelial cells. In 2005, mammalian multidrug and toxin extrusion 1 (MATE1)/SLC47A1 was identified as an orthologue of bacterial NorM. MATE1 is the H(+)/organic cation antiporter at the apical membrane, which mediates the secretion of organic cations. Kidney-specific MATE2-K was isolated from human kidney and localized at the brush-border membrane of proximal tubules. Like MATE1, MATE2-K mediates the secretion of organic cations into urine. MATE1 and MATE2-K are involved in the excretion of important medications and the disruption of these transporters can cause severe pharmacological problems. Recent findings regarding the MATE/SLC47 family are summarized in this review.
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Tega Y, Akanuma SI, Kubo Y, Terasaki T, Hosoya KI. Blood-to-brain influx transport of nicotine at the rat blood?brain barrier: Involvement of a pyrilamine-sensitive organic cation transport process. Neurochem Int 2013; 62:173-81. [DOI: 10.1016/j.neuint.2012.11.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 11/24/2012] [Accepted: 11/26/2012] [Indexed: 11/15/2022]
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Nies AT, Damme K, Schaeffeler E, Schwab M. Multidrug and toxin extrusion proteins as transporters of antimicrobial drugs. Expert Opin Drug Metab Toxicol 2012; 8:1565-77. [PMID: 22970772 DOI: 10.1517/17425255.2012.722996] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
INTRODUCTION Antimicrobial drugs are essential in the treatment of infectious diseases. A better understanding of transport processes involved in drug disposition will improve the predictability of drug-drug interactions with consequences for drug response. Multidrug And Toxin Extrusion (MATE; SLC47A) proteins are efflux transporters mediating the excretion of several antimicrobial drugs as well as other organic compounds into bile and urine, thereby contributing to drug disposition. AREAS COVERED This review summarizes current knowledge of the structural and molecular features of human MATE transporters including their functional role in drug transport with a specific focus on antimicrobial drugs. The PubMed database was searched using the terms "MATE1," "MATE-2K," "MATE2," "SLC47A1," "SLC47A2," and "toxin extrusion protein" (up to June 2012). EXPERT OPINION MATE proteins have been recognized as important transporters mediating the final excretion step of cationic drugs into bile and urine. These include the antiviral drugs acyclovir, amprenavir, and ganciclovir, the antibiotics cephalexin, cephradine and levofloxacin, as well as the antimalarial agents chloroquine and quinine. It is therefore important to enhance our understanding of the role of MATEs in drug extrusion with particular emphasis on the functional consequences of genetic variants on disposition of these antimicrobial drugs.
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Affiliation(s)
- Anne T Nies
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Stuttgart and University of Tübingen, Auerbachstrasse 112, 70376 Stuttgart, Germany.
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Arino T, Karakawa S, Ishiwata Y, Nagata M, Yasuhara M. Effect of cimetidine on pentamidine induced hyperglycemia in rats. Eur J Pharmacol 2012; 693:72-9. [PMID: 22968103 DOI: 10.1016/j.ejphar.2012.07.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 07/07/2012] [Accepted: 07/27/2012] [Indexed: 01/08/2023]
Abstract
The antiprotozoal agent pentamidine, used for the treatment of Pneumocystis jirovecii pneumonia (PCP), is known to cause abnormalities in blood glucose homeostasis, such as hypoglycemia and hyperglycemia. Pentamidine has been reported to be a substrate of organic cation transporter 1 (OCT1). We investigated the combination effects of cimetidine, an OCT1 inhibitor, on the pharmacokinetics of pentamidine and on pentamidine-induced hyperglycemia. Pentamidine was infused intravenously to rats for 20 min at a dose of 7.5 or 15 mg/kg and serum samples were obtained periodically. The serum concentration of glucose did not change significantly after pentamidine infusion at 7.5mg/kg, while it increased with pentamidine at 15 mg/kg, and the maximal concentration of glucose was 167 ± 36 mg/dl, 30 min after the start of pentamidine infusion. Cimetidine (50mg/kg) enhanced the pentamidine-induced elevation of glucose concentration and the maximal concentration of glucose was 208 ± 33 mg/dl in the pentamidine 15 mg/kg treated group. Cimetidine combination significantly reduced total body clearance of pentamidine and increased pentamidine concentrations in the liver, kidneys, and lungs. A significant correlation was found between changes in serum glucose concentrations and serum concentrations of pentamidine 30 min after the start of pentamidine infusion. These results suggest that the hyperglycemic effect of pentamidine is dependent on the concentration of pentamidine and can be enhanced by cimetidine combination.
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Affiliation(s)
- Toru Arino
- Department of Pharmacy, University Hospital of Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
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Zhang X, He X, Baker J, Tama F, Chang G, Wright SH. Twelve transmembrane helices form the functional core of mammalian MATE1 (multidrug and toxin extruder 1) protein. J Biol Chem 2012; 287:27971-82. [PMID: 22722930 DOI: 10.1074/jbc.m112.386979] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The x-ray structure of the prototypic MATE family member, NorM from Vibrio cholerae, reveals a protein fold composed of 12 transmembrane helices (TMHs), confirming hydropathy analyses of the majority of (prokaryotic and plant) MATE transporters. However, the mammalian MATEs are generally predicted to have a 13(th) TMH and an extracellular C terminus. Here we affirm this prediction, showing that the C termini of epitope-tagged, full-length human, rabbit, and mouse MATE1 were accessible to antibodies from the extracellular face of the membrane. Truncation of these proteins at or near the predicted junction between the 13(th) TMH and the long cytoplasmic loop that precedes it resulted in proteins that (i) trafficked to the membrane and (ii) interacted with antibodies only after permeabilization of the plasma membrane. CHO cells expressing rbMate1 truncated at residue Gly-545 supported levels of pH-sensitive transport similar to that of cells expressing the full-length protein. Although the high transport rate of the Gly-545 truncation mutant was associated with higher levels of membrane expression (than full-length MATE1), suggesting the 13(th) TMH may influence substrate translocation, the selectivity profile of the mutant indicated that TMH13 has little impact on ligand binding. We conclude that the functional core of MATE1 consists of 12 (not 13) TMHs. Therefore, we used the x-ray structure of NorM to develop a homology model of the first 12 TMHs of MATE1. The model proved to be stable in molecular dynamic simulations and agreed with topology evident from preliminary cysteine scanning of intracellular versus extracellular loops.
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Affiliation(s)
- Xiaohong Zhang
- Department of Physiology, University of Arizona, Tucson, Arizona 85724, USA
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Togawa N, Miyaji T, Izawa S, Omote H, Moriyama Y. A Na+-phosphate cotransporter homologue (SLC17A4 protein) is an intestinal organic anion exporter. Am J Physiol Cell Physiol 2012; 302:C1652-60. [DOI: 10.1152/ajpcell.00015.2012] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The SLC17 anion transporter family comprises nine members that transport various organic anions in membrane potential (Δψ)- and Cl−-dependent manners. Although the transport substrates and physiological relevance of the majority of the members have already been determined, little is known about SLC17A4 proteins known to be Na+-phosphate cotransporter homologue (NPT homologue). In the present study, we investigated the expression and transport properties of human SLC17A4 protein. Using specific antibodies, we found that a human NPT homologue is specifically expressed and present in the intestinal brush border membrane. Proteoliposomes containing the purified protein took up radiolabeled p-aminohippuric acid (PAH) in a Cl−-dependent manner at the expense of an electrochemical gradient of protons, especially Δψ, across the membrane. The Δψ- and Cl−-dependent PAH uptake was inhibited by diisothiocyanostilbene-2,2′-disulfonic acid and Evans blue, common inhibitors of SLC17 family members. cis-Inhibition studies revealed that various anionic compounds, such as hydrophilic nonsteroidal anti-inflammatory drugs, pravastatin, and urate inhibited the PAH uptake. Proteoliposomes took up radiolabeled urate, with the uptake having properties similar to those of PAH uptake. These results strongly suggested that the human NPT homologue acts as a polyspecific organic anion exporter in the intestines. Since SLC17A1 protein (NPT1) and SLC17A3 protein (NPT4) are responsible for renal urate extrusion, our results reveal the possible involvement of a NPT homologue in urate extrusion from the intestinal duct.
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Affiliation(s)
- Natsuko Togawa
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Takaaki Miyaji
- Advanced Science Research Center, Okayama University, Okayama, Japan
| | - Sho Izawa
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Hiroshi Omote
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Yoshinori Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- Advanced Science Research Center, Okayama University, Okayama, Japan
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Shinozaki G. The integrated model of serotonin transporter gene variation (5HTTLPR) and the glial cell transporter in stress vulnerability and depression. Med Hypotheses 2012; 78:410-4. [PMID: 22236459 DOI: 10.1016/j.mehy.2011.10.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 07/08/2011] [Accepted: 10/27/2011] [Indexed: 10/14/2022]
Abstract
The serotonin transporter gene (SLC6A4) promoter polymorphism (5HTTLPR) has been associated with individual stress responses such that individuals with childhood abuse history have higher rates of depression in later life if they are homozygous short (s/s) of the gene. It is hypothesized that these findings could be explained by an integrated model of a role of the glial cell transporter and a functional difference of 5HTTLPR in the capacity of absorbing serotonin from the synapse. A hypothetical integrated model of the SLC6A4 function and the role of glial cells are put forward to explain accumulating results of recent investigations exploring the relationship between the gene and the diverse mental activities including depression and stress response. A model based on SLC6A4 variation is proposed to explain individual differences in stress vulnerability/resilience. The role of the glial cell transporter surrounding the synapse is integrated in the model to understand the modulation of the neurotransmission. It is hypothesized that a synapse with less serotonin transporter contributes to unstable processing in neurotransmission as compared to a synapse with more serotonin transporter. As such, based on functional differences of 5HTTLPR in the expression of the serotonin transporter, it is asserted that individuals with the s/s genotype process neurotransmission differently and in a reactive way. This integrated model of 5HTTLPR and glial cells suggests that the efficacy of serotonin reuptake in the synapse may play a crucial role in variability of neurotransmission, which can lead to differences in the stress response and the pathophysiology of depression.
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Affiliation(s)
- Gen Shinozaki
- Department of Psychiatry and Psychology, Mayo Clinic, Rochester, MN, United States.
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Damme K, Nies AT, Schaeffeler E, Schwab M. Mammalian MATE (SLC47A) transport proteins: impact on efflux of endogenous substrates and xenobiotics. Drug Metab Rev 2011; 43:499-523. [PMID: 21923552 DOI: 10.3109/03602532.2011.602687] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Multidrug and toxin extrusion proteins (MATEs; SLC47A) are mammalian transporters being predominately expressed in the brush-border membrane of proximal tubule epithelial cells in the kidney and the canalicular membrane of hepatocytes. Functionally, MATEs act as efflux transporters for organic compounds, thereby mediating the elimination process. Two isoforms, MATE1 and 2, have been identified, and, so far, only a limited number of substrates, including clinically used drugs such as metformin and cimetidine, are known. A knockout mouse model has been established, as well, and is a valuable tool for further systematic pharmacokinetic analyses. In this review, we summarize the progress in MATE research on structural, molecular, functional, and pathophysiological aspects. Consequences of genetic variants for pharmacokinetic alterations and drug therapy are discussed.
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Affiliation(s)
- Katja Damme
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, Stuttgart, Germany
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Graham GG, Punt J, Arora M, Day RO, Doogue MP, Duong JK, Furlong TJ, Greenfield JR, Greenup LC, Kirkpatrick CM, Ray JE, Timmins P, Williams KM. Clinical pharmacokinetics of metformin. Clin Pharmacokinet 2011; 50:81-98. [PMID: 21241070 DOI: 10.2165/11534750-000000000-00000] [Citation(s) in RCA: 779] [Impact Index Per Article: 59.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Metformin is widely used for the treatment of type 2 diabetes mellitus. It is a biguanide developed from galegine, a guanidine derivative found in Galega officinalis (French lilac). Chemically, it is a hydrophilic base which exists at physiological pH as the cationic species (>99.9%). Consequently, its passive diffusion through cell membranes should be very limited. The mean ± SD fractional oral bioavailability (F) of metformin is 55 ± 16%. It is absorbed predominately from the small intestine. Metformin is excreted unchanged in urine. The elimination half-life (t(½)) of metformin during multiple dosages in patients with good renal function is approximately 5 hours. From published data on the pharmacokinetics of metformin, the population mean of its clearances were calculated. The population mean renal clearance (CL(R)) and apparent total clearance after oral administration (CL/F) of metformin were estimated to be 510 ± 130 mL/min and 1140 ± 330 mL/min, respectively, in healthy subjects and diabetic patients with good renal function. Over a range of renal function, the population mean values of CL(R) and CL/F of metformin are 4.3 ± 1.5 and 10.7 ± 3.5 times as great, respectively, as the clearance of creatinine (CL(CR)). As the CL(R) and CL/F decrease approximately in proportion to CL(CR), the dosage of metformin should be reduced in patients with renal impairment in proportion to the reduced CL(CR). The oral absorption, hepatic uptake and renal excretion of metformin are mediated very largely by organic cation transporters (OCTs). An intron variant of OCT1 (single nucleotide polymorphism [SNP] rs622342) has been associated with a decreased effect on blood glucose in heterozygotes and a lack of effect of metformin on plasma glucose in homozygotes. An intron variant of multidrug and toxin extrusion transporter [MATE1] (G>A, SNP rs2289669) has also been associated with a small increase in antihyperglycaemic effect of metformin. Overall, the effect of structural variants of OCTs and other cation transporters on the pharmacokinetics of metformin appears small and the subsequent effects on clinical response are also limited. However, intersubject differences in the levels of expression of OCT1 and OCT3 in the liver are very large and may contribute more to the variations in the hepatic uptake and clinical effect of metformin. Lactic acidosis is the feared adverse effect of the biguanide drugs but its incidence is very low in patients treated with metformin. We suggest that the mean plasma concentrations of metformin over a dosage interval be maintained below 2.5 mg/L in order to minimize the development of this adverse effect.
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Affiliation(s)
- Garry G Graham
- Department of Pharmacology & Toxicology, St Vincents Clinical School, University of New South Wales, Sydney, New South Wales, Australia.
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Komatsu T, Hiasa M, Miyaji T, Kanamoto T, Matsumoto T, Otsuka M, Moriyama Y, Omote H. Characterization of the human MATE2 proton-coupled polyspecific organic cation exporter. Int J Biochem Cell Biol 2011; 43:913-8. [PMID: 21419862 DOI: 10.1016/j.biocel.2011.03.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 03/07/2011] [Accepted: 03/09/2011] [Indexed: 01/11/2023]
Abstract
Human multidrug and toxic compound extrusion 2 (hMATE2) is a kidney-specific isoform of hMATE1, an exporter of toxic organic cations (OCs) of exogenous and endogenous origins at the final excretion step in the kidneys and liver (Otsuka et al., 2005), and contains a splicing variant, MATE2K, that has an exon of hMATE2 deleted (Masuda et al., 2006). In the present study, we characterized the degree of expression and the transport properties of hMATE2. Quantitative PCR analysis with probes specific for hMATE2 indicated the presence of hMATE2 mRNA in the kidneys, which corresponded to 39% of total mRNA encoding both hMATE2 and hMATE2K. hMATE2-specific antibodies immunostained the renal urinary tubules. Upon expression in HEK293 cells, hMATE2 was localized in intracellular vesicular structures, and thus transport activity of tetraethylammonium (TEA), a typical substrate for MATE transporters, by the cells was not detected. The hMATE2 protein was purified and reconstituted into liposomes. An artificially imposed pH gradient (ΔpH) across the proteoliposomal membrane drove the uptake of TEA. Dissipation of ΔpH by ammonium sulfate effectively inhibited the TEA uptake, while that of the membrane potential by valinomycin had little effect. The profiles of cis-inhibition of TEA transport by hMATE2 and hMATE2K are similar to each other. Thus, both hMATE2 and hMATE2K equally operate in the human kidneys to extrude OCs into the urine.
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Affiliation(s)
- Toshinori Komatsu
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
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Winter TN, Elmquist WF, Fairbanks CA. OCT2 and MATE1 provide bidirectional agmatine transport. Mol Pharm 2010; 8:133-42. [PMID: 21128598 DOI: 10.1021/mp100180a] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Agmatine is a biogenic amine (l-arginine metabolite) of potential relevance to several central nervous system (CNS) conditions. The identities of transporters underlying agmatine and polyamine disposition in mammalian systems are not well-defined. The SLC-family organic cation transporters (OCT) OCT1 and OCT2 and multidrug and toxin extrusion transporter-1 (MATE1) are transport systems that may be of importance for the cellular disposition of agmatine and putrescine. We investigated the transport of [(3)H]agmatine and [(3)H]putrescine in human embryonic kidney (HEK293) cells stably transfected with hOCT1, hOCT2, and hMATE1. Agmatine transport by hOCT1 and hOCT2 was concentration-dependent, whereas only hOCT2 demonstrated pH-dependent transport. hOCT2 exhibited a greater affinity for agmatine (K(m) = 1.84 ± 0.38 mM) than did hOCT1 (K(m) = 18.73 ± 4.86 mM). Putrescine accumulation was pH- and concentration-dependent in hOCT2-HEK cells (K(m) = 11.29 ± 4.26 mM) but not hOCT1-HEK cells. Agmatine accumulation, in contrast to putrescine, was significantly enhanced by hMATE1 overexpression, and was saturable (K(m) = 240 ± 31 μM; V(max) = 192 ± 10 pmol/min/mg of protein). Intracellular agmatine was also trans-stimulated (effluxed) from hMATE1-HEK cells in the presence of an inward proton-gradient. The hMATE1-mediated transport of agmatine was inhibited by polyamines, the prototypical substrates MPP+ and paraquat, as well as guanidine and arcaine, but not l-arginine. These results suggest that agmatine disposition may be influenced by hOCT2 and hMATE1, two transporters critical in the renal elimination of xenobiotic compounds.
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Affiliation(s)
- Tate N Winter
- Departments of Pharmaceutics, Pharmacology, and Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Nakanishi T, Haruta T, Shirasaka Y, Tamai I. Organic Cation Transporter-Mediated Renal Secretion of Ipratropium and Tiotropium in Rats and Humans. Drug Metab Dispos 2010; 39:117-22. [DOI: 10.1124/dmd.110.035402] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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Magalhaes JV. How a microbial drug transporter became essential for crop cultivation on acid soils: aluminium tolerance conferred by the multidrug and toxic compound extrusion (MATE) family. ANNALS OF BOTANY 2010; 106:199-203. [PMID: 20511585 PMCID: PMC2889808 DOI: 10.1093/aob/mcq115] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
BACKGROUND Aluminium (Al) toxicity is a major agricultural constraint for crop cultivation on acid soils, which comprise a large portion of the world's arable land. One of the most widely accepted mechanisms of Al tolerance in plants is based on Al-activated organic acid release into the rhizosphere, with organic acids forming stable, non-toxic complexes with Al. This mechanism has recently been validated by the isolation of bona-fide Al-tolerance genes in crop species, which encode membrane transporters that mediate Al-activated organic acid release leading to Al exclusion from root apices. In crop species such as sorghum and barley, members in the multidrug and toxic compound extrusion (MATE) family underlie Al tolerance by a mechanism based on Al-activated citrate release. SCOPE AND CONCLUSIONS The study of Al tolerance in plants as conferred by MATE family members is in its infancy. Therefore, much is yet to be discovered about the functional diversity and evolutionary dynamics that led MATE proteins to acquire transport properties conducive to Al tolerance in plants. In this paper we review the major characteristics of transporters in the MATE family and will relate this knowledge to Al tolerance in plants. The MATE family is clearly extremely flexible with respect to substrate specificity, which raises the possibility that Al tolerance as encoded by MATE proteins may not be restricted to Al-activated citrate release in plant species. There are also indications that regulatory loci may be of pivotal importance to fully explore the potential for Al-tolerance improvement based on MATE genes.
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Feng N, Lowry CA, Lukkes JL, Orchinik M, Forster GL, Renner KJ. Organic cation transporter inhibition increases medial hypothalamic serotonin under basal conditions and during mild restraint. Brain Res 2010; 1326:105-13. [PMID: 20171957 DOI: 10.1016/j.brainres.2010.02.044] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Revised: 02/10/2010] [Accepted: 02/10/2010] [Indexed: 01/01/2023]
Abstract
The dorsomedial hypothalamus (DMH) has been implicated in the coordination of stress responses. Restraint stress or systemic corticosterone (CORT) treatment induces a rapid increase in tissue concentrations of serotonin (5-hydroxytryptamine; 5-HT) in the DMH. Although the mechanism for rapid changes in 5-HT concentrations in the DMH is not clear, earlier results suggest that stress-induced increases in CORT may inhibit 5-HT transport from the extracellular fluid by acting on corticosterone-sensitive organic cation transporters (OCTs). We tested the hypothesis that perfusion of the medial hypothalamus (MH), which includes the DMH, with the OCT blocker decynium 22 (D-22) would potentiate the effects of mild restraint on extracellular 5-HT. Male Sprague-Dawley rats, implanted with a microdialysis probe into the MH, were treated with reverse-dialysis of D-22 (20 microM; 40 min) or vehicle and subjected to either 40 min mild restraint or undisturbed control conditions. Perfusates collected from a separate group of rats were evaluated for the effect of restraint on extracellular CORT concentrations in the MH. Reverse-dialysis of D-22 induced an increase (200%) in extracellular 5-HT concentrations in the MH in undisturbed control rats. Restraint in the absence of D-22 did not significantly affect MH CORT or 5-HT concentrations. However, perfusion of the MH with D-22 during restraint led to an increased magnitude and duration of extracellular 5-HT concentrations, relative to D-22 by itself. These results are consistent with the hypothesis that OCTs in the DMH contribute to the clearance of 5-HT from the extracellular fluid under both baseline conditions and mild restraint.
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Affiliation(s)
- Na Feng
- Department of Biology, University of South Dakota, Vermillion, SD 57069-2390, USA
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