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Egli-Spichtig D, Imenez Silva PH, Glaudemans B, Gehring N, Bettoni C, Zhang MYH, Pastor-Arroyo EM, Schönenberger D, Rajski M, Hoogewijs D, Knauf F, Misselwitz B, Frey-Wagner I, Rogler G, Ackermann D, Ponte B, Pruijm M, Leichtle A, Fiedler GM, Bochud M, Ballotta V, Hofmann S, Perwad F, Föller M, Lang F, Wenger RH, Frew I, Wagner CA. Tumor necrosis factor stimulates fibroblast growth factor 23 levels in chronic kidney disease and non-renal inflammation. Kidney Int 2019; 96:890-905. [PMID: 31301888 DOI: 10.1016/j.kint.2019.04.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 03/11/2019] [Accepted: 04/05/2019] [Indexed: 01/03/2023]
Abstract
Fibroblast growth factor 23 (FGF23) regulates phosphate homeostasis, and its early rise in patients with chronic kidney disease is independently associated with all-cause mortality. Since inflammation is characteristic of chronic kidney disease and associates with increased plasma FGF23 we examined whether inflammation directly stimulates FGF23. In a population-based cohort, plasma tumor necrosis factor (TNF) was the only inflammatory cytokine that independently and positively correlated with plasma FGF23. Mouse models of chronic kidney disease showed signs of renal inflammation, renal FGF23 expression and elevated systemic FGF23 levels. Renal FGF23 expression coincided with expression of the orphan nuclear receptor Nurr1 regulating FGF23 in other organs. Antibody-mediated neutralization of TNF normalized plasma FGF23 and suppressed ectopic renal Fgf23 expression. Conversely, TNF administration to control mice increased plasma FGF23 without altering plasma phosphate. Moreover, in Il10-deficient mice with inflammatory bowel disease and normal kidney function, plasma FGF23 was elevated and normalized upon TNF neutralization. Thus, the inflammatory cytokine TNF contributes to elevated systemic FGF23 levels and also triggers ectopic renal Fgf23 expression in animal models of chronic kidney disease.
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Affiliation(s)
- Daniela Egli-Spichtig
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland; Department of Pediatrics, Division of Nephrology, University of California, San Francisco, San Francisco, California, USA
| | - Pedro Henrique Imenez Silva
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Bob Glaudemans
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Nicole Gehring
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Carla Bettoni
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Martin Y H Zhang
- Department of Pediatrics, Division of Nephrology, University of California, San Francisco, San Francisco, California, USA
| | - Eva M Pastor-Arroyo
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Désirée Schönenberger
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Michal Rajski
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - David Hoogewijs
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Felix Knauf
- Division of Nephrology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Benjamin Misselwitz
- University Hospital Zurich, Clinic for Gastroenterology and Hepatology, Zurich, Switzerland
| | - Isabelle Frey-Wagner
- University Hospital Zurich, Clinic for Gastroenterology and Hepatology, Zurich, Switzerland
| | - Gerhard Rogler
- University Hospital Zurich, Clinic for Gastroenterology and Hepatology, Zurich, Switzerland
| | - Daniel Ackermann
- Department of Nephrology and Hypertension, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Belen Ponte
- Department of Nephrology, University Hospital of Geneva (HUG), Geneva, Switzerland
| | - Menno Pruijm
- Department of Nephrology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Alexander Leichtle
- Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Georg-Martin Fiedler
- Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Murielle Bochud
- Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland; Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Virginia Ballotta
- Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Sandra Hofmann
- Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Farzana Perwad
- Department of Pediatrics, Division of Nephrology, University of California, San Francisco, San Francisco, California, USA
| | - Michael Föller
- Institute of Physiology, University of Hohenheim, Stuttgart, Germany
| | - Florian Lang
- Institute of Physiology I, University of Tübingen, Tübingen, Germany
| | - Roland H Wenger
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Ian Frew
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland
| | - Carsten A Wagner
- Institute of Physiology, University of Zurich, Zurich, Switzerland; Swiss National Center of Competence in Research NCCR-Kidney.CH, University of Zurich, Zurich, Switzerland.
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Hajarnis S, Yheskel M, Williams D, Brefort T, Glaudemans B, Debaix H, Baum M, Devuyst O, Patel V. Suppression of microRNA Activity in Kidney Collecting Ducts Induces Partial Loss of Epithelial Phenotype and Renal Fibrosis. J Am Soc Nephrol 2017; 29:518-531. [PMID: 29021386 DOI: 10.1681/asn.2017030334] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 08/16/2017] [Indexed: 12/26/2022] Open
Abstract
microRNAs (miRNAs) are sequence-specific inhibitors of post-transcriptional gene expression. The physiologic function of these noncoding RNAs in postnatal renal tubules still remains unclear. Surprisingly, they appear to be dispensable for mammalian proximal tubule (PT) function. Here, we examined the effects of miRNA suppression in collecting ducts (CDs). To conclusively evaluate the role of miRNAs, we generated three mouse models with CD-specific inactivation of key miRNA pathway genes Dicer, Dgcr8, and the entire Argonaute gene family (Ago1, 2, 3, and 4). Characterization of these three mouse models revealed that inhibition of miRNAs in CDs spontaneously evokes a renal tubule injury-like response, which culminates in progressive tubulointerstitial fibrosis (TIF) and renal failure. Global miRNA profiling of microdissected renal tubules showed that miRNAs exhibit segmental distribution along the nephron and CDs. In particular, the expression of miR-200c is nearly 70-fold higher in CDs compared with PTs. Accordingly, miR-200s are downregulated in Dicer-KO CDs, its direct target genes Zeb1, Zeb2, and Snail2 are upregulated, and miRNA-depleted CDs undergo partial epithelial-to-mesenchymal transition (EMT). Thus, miRNAs are essential for CD homeostasis. Downregulation of CD-enriched miRNAs and the subsequent induction of partial EMT may be a new mechanism for TIF progression.
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Affiliation(s)
- Sachin Hajarnis
- Division of Nephrology, Department of Internal Medicine, and
| | - Matanel Yheskel
- Division of Nephrology, Department of Internal Medicine, and
| | - Darren Williams
- Division of Nephrology, Department of Internal Medicine, and
| | - Thomas Brefort
- Comprehensive Biomarker Center, Heidelberg, Germany; and
| | - Bob Glaudemans
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Huguette Debaix
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Michel Baum
- Division of Nephrology, Department of Internal Medicine, and.,Division of Nephrology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Olivier Devuyst
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Vishal Patel
- Division of Nephrology, Department of Internal Medicine, and
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Di Chiara M, Glaudemans B, Loffing-Cueni D, Odermatt A, Al-Hasani H, Devuyst O, Faresse N, Loffing J. Rab-GAP TBC1D4 (AS160) is dispensable for the renal control of sodium and water homeostasis but regulates GLUT4 in mouse kidney. Am J Physiol Renal Physiol 2015; 309:F779-90. [PMID: 26336159 DOI: 10.1152/ajprenal.00139.2015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 08/29/2015] [Indexed: 12/17/2022] Open
Abstract
The Rab GTPase-activating protein TBC1D4 (AS160) controls trafficking of the glucose transporter GLUT4 in adipocytes and skeletal muscle cells. TBC1D4 is also highly abundant in the renal distal tubule, although its role in this tubule is so far unknown. In vitro studies suggest that it is involved in the regulation of renal transporters and channels such as the epithelial sodium channel (ENaC), aquaporin-2 (AQP2), and the Na+-K+-ATPase. To assess the physiological role of TBC1D4 in the kidney, wild-type (TBC1D4+/+) and TBC1D4-deficient (TBC1D4-/-) mice were studied. Unexpectedly, neither under standard nor under challenging conditions (low Na+/high K+, water restriction) did TBC1D4-/- mice show any difference in urinary Na+ and K+ excretion, urine osmolarity, plasma ion and aldosterone levels, and blood pressure compared with TBC1D4+/+ mice. Also, immunoblotting did not reveal any change in the abundance of major renal sodium- and water-transporting proteins [Na-K-2Cl cotransporter (NKCC2) NKCC2, NaCl cotransporter (NCC), ENaC, AQP2, and the Na+-K+-ATPase]. However, the abundance of GLUT4, which colocalizes with TBC1D4 along the distal nephron of TBC1D4+/+ mice, was lower in whole kidney lysates of TBC1D4-/- mice than in TBC1D4+/+ mice. Likewise, primary thick ascending limb (TAL) cells isolated from TBC1D4-/- mice showed an increased basal glucose uptake and an abrogated insulin response compared with TAL cells from TBC1D4+/+ mice. Thus, TBC1D4 is dispensable for the regulation of renal Na+ and water transport, but may play a role for GLUT4-mediated basolateral glucose uptake in distal tubules. The latter may contribute to the known anaerobic glycolytic capacity of distal tubules during renal ischemia.
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Affiliation(s)
- Marianna Di Chiara
- Institute of Anatomy, University of Zurich, Zurich, Switzerland; Zurich Center of Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Bob Glaudemans
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | | | - Alex Odermatt
- Division of Molecular and Systems Toxicology, Pharmacenter, University of Basel, Basel, Switzerland; National Center of Competence in Research "Kidney.CH," Switzerland; and
| | - Hadi Al-Hasani
- German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich-Heine-University and German Center for Diabetes Research, Düsseldorf, Germany
| | - Olivier Devuyst
- Zurich Center of Integrative Human Physiology, University of Zurich, Zurich, Switzerland; Institute of Physiology, University of Zurich, Zurich, Switzerland; National Center of Competence in Research "Kidney.CH," Switzerland; and
| | - Nourdine Faresse
- Institute of Anatomy, University of Zurich, Zurich, Switzerland; Zurich Center of Integrative Human Physiology, University of Zurich, Zurich, Switzerland; National Center of Competence in Research "Kidney.CH," Switzerland; and
| | - Johannes Loffing
- Institute of Anatomy, University of Zurich, Zurich, Switzerland; Zurich Center of Integrative Human Physiology, University of Zurich, Zurich, Switzerland; National Center of Competence in Research "Kidney.CH," Switzerland; and
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Olden M, Corre T, Hayward C, Toniolo D, Ulivi S, Gasparini P, Pistis G, Hwang SJ, Bergmann S, Campbell H, Cocca M, Gandin I, Girotto G, Glaudemans B, Hastie ND, Loffing J, Polasek O, Rampoldi L, Rudan I, Sala C, Traglia M, Vollenweider P, Vuckovic D, Youhanna S, Weber J, Wright AF, Kutalik Z, Bochud M, Fox CS, Devuyst O. Common variants in UMOD associate with urinary uromodulin levels: a meta-analysis. J Am Soc Nephrol 2014; 25:1869-82. [PMID: 24578125 DOI: 10.1681/asn.2013070781] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Uromodulin is expressed exclusively in the thick ascending limb and is the most abundant protein excreted in normal urine. Variants in UMOD, which encodes uromodulin, are associated with renal function, and urinary uromodulin levels may be a biomarker for kidney disease. However, the genetic factors regulating uromodulin excretion are unknown. We conducted a meta-analysis of urinary uromodulin levels to identify associated common genetic variants in the general population. We included 10,884 individuals of European descent from three genetic isolates and three urban cohorts. Each study measured uromodulin indexed to creatinine and conducted linear regression analysis of approximately 2.5 million single nucleotide polymorphisms using an additive model. We also tested whether variants in genes expressed in the thick ascending limb associate with uromodulin levels. rs12917707, located near UMOD and previously associated with renal function and CKD, had the strongest association with urinary uromodulin levels (P<0.001). In all cohorts, carriers of a G allele of this variant had higher uromodulin levels than noncarriers did (geometric means 10.24, 14.05, and 17.67 μg/g creatinine for zero, one, or two copies of the G allele). rs12446492 in the adjacent gene PDILT (protein disulfide isomerase-like, testis expressed) also reached genome-wide significance (P<0.001). Regarding genes expressed in the thick ascending limb, variants in KCNJ1, SORL1, and CAB39 associated with urinary uromodulin levels. These data indicate that common variants in the UMOD promoter region may influence urinary uromodulin levels. They also provide insights into uromodulin biology and the association of UMOD variants with renal function.
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Affiliation(s)
- Matthias Olden
- National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, Massachusetts; Department of Genetic Epidemiology, Institute of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - Tanguy Corre
- Department of Medical Genetics, University of Lausanne, Lausanne, Switzerland; Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Caroline Hayward
- Institute of Genetics and Molecular Medicine, Western General Hospital, and
| | - Daniela Toniolo
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy; Institute of Molecular Genetics, National Research Council, Pavia, Italy
| | - Sheila Ulivi
- Institute for Maternal and Child Health, Burlo Garofolo Pediatric Institute Trieste, Italy
| | - Paolo Gasparini
- Institute for Maternal and Child Health, Burlo Garofolo Pediatric Institute Trieste, Italy; Department of Medical Sciences, University of Trieste, Trieste, Italy
| | - Giorgio Pistis
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy
| | - Shih-Jen Hwang
- National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, Massachusetts
| | - Sven Bergmann
- Department of Medical Genetics, University of Lausanne, Lausanne, Switzerland; Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Harry Campbell
- Dulbecco Telethon Institute, San Raffaele Scientific Institute, Milan, Italy
| | - Massimiliano Cocca
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy
| | - Ilaria Gandin
- Institute for Maternal and Child Health, Burlo Garofolo Pediatric Institute Trieste, Italy; Department of Medical Sciences, University of Trieste, Trieste, Italy
| | - Giorgia Girotto
- Institute for Maternal and Child Health, Burlo Garofolo Pediatric Institute Trieste, Italy; Department of Medical Sciences, University of Trieste, Trieste, Italy
| | - Bob Glaudemans
- Institute of Physiology, Zurich Center for Integrative Human Physiology, and
| | - Nicholas D Hastie
- Institute of Genetics and Molecular Medicine, Western General Hospital, and
| | | | - Ozren Polasek
- Department of Public Health, Faculty of Medicine, University of Split, Croatia
| | - Luca Rampoldi
- Dulbecco Telethon Institute, San Raffaele Scientific Institute, Milan, Italy
| | - Igor Rudan
- Department of Genetic Epidemiology, Institute of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany
| | - Cinzia Sala
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy
| | - Michela Traglia
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milano, Italy
| | | | - Dragana Vuckovic
- Institute for Maternal and Child Health, Burlo Garofolo Pediatric Institute Trieste, Italy; Department of Medical Sciences, University of Trieste, Trieste, Italy
| | - Sonia Youhanna
- Institute of Physiology, Zurich Center for Integrative Human Physiology, and Division of Nephrology, Catholic University of Louvain Medical School, Brussels, Belgium
| | - Julien Weber
- Institute of Physiology, Zurich Center for Integrative Human Physiology, and Division of Nephrology, Catholic University of Louvain Medical School, Brussels, Belgium
| | - Alan F Wright
- Institute of Genetics and Molecular Medicine, Western General Hospital, and
| | - Zoltán Kutalik
- Department of Medical Genetics, University of Lausanne, Lausanne, Switzerland; Swiss Institute of Bioinformatics, Lausanne, Switzerland; Institute of Social and Preventive Medicine, Lausanne University Hospital, Lausanne, Switzerland; and
| | - Murielle Bochud
- Institute of Social and Preventive Medicine, Lausanne University Hospital, Lausanne, Switzerland; and
| | - Caroline S Fox
- National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, Massachusetts; Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
| | - Olivier Devuyst
- Institute of Physiology, Zurich Center for Integrative Human Physiology, and Division of Nephrology, Catholic University of Louvain Medical School, Brussels, Belgium;
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Youhanna S, Weber J, Beaujean V, Glaudemans B, Sobek J, Devuyst O. Determination of uromodulin in human urine: influence of storage and processing. Nephrol Dial Transplant 2013; 29:136-45. [PMID: 24097801 DOI: 10.1093/ndt/gft345] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Uromodulin (Tamm-Horsfall protein) is the most abundant protein excreted in the urine under physiological conditions. It is exclusively produced in the kidney and secreted into the urine via proteolytic cleavage. The involvement of UMOD, the gene that encodes uromodulin, in rare autosomal dominant diseases, and its robust genome-wide association with the risk of chronic kidney disease suggest that the level of uromodulin in urine could represent a critical biomarker for kidney function. The structure of uromodulin is complex, with multiple disulfide bonds and typical domains of extracellular proteins. METHODS Thus far, the conditions influencing stability and measurement of uromodulin in human urine have not been systematically investigated, giving inconsistent results. In this study, we used a robust, in-house ELISA to characterize the conditions of sampling and storage necessary to provide a faithful dosage of uromodulin in the urine. RESULTS The levels of uromodulin in human urine were significantly affected by centrifugation and vortexing, as well as by the conditions and duration of storage. CONCLUSIONS These results validate a simple, low-cost ELISA and document the optimal conditions of processing and storage for measuring uromodulin in human urine.
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Affiliation(s)
- Sonia Youhanna
- Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
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6
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Glaudemans B, Terryn S, Gölz N, Brunati M, Cattaneo A, Bachi A, Al-Qusairi L, Ziegler U, Staub O, Rampoldi L, Devuyst O. A primary culture system of mouse thick ascending limb cells with preserved function and uromodulin processing. Pflugers Arch 2013; 466:343-56. [DOI: 10.1007/s00424-013-1321-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 06/23/2013] [Accepted: 06/23/2013] [Indexed: 11/28/2022]
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van Angelen AA, Glaudemans B, van der Kemp AW, Hoenderop JG, Bindels RJ. Cisplatin-induced injury of the renal distal convoluted tubule is associated with hypomagnesaemia in mice. Nephrol Dial Transplant 2012; 28:879-89. [DOI: 10.1093/ndt/gfs499] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Glaudemans B, Wijst J, Scola R, Lorenzoni P, Heister A, Kemp A, Knoers N, Hoenderop J, Bindels R. The voltage‐operated Potassium channel Kv1.1 as new player in renal Magnesium handling. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.1025.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Rosana Scola
- Neuromuscular Disorders DivisionClinical HospitalParana Federal UniversityParanaBrazil
| | - Paulo Lorenzoni
- Neuromuscular Disorders DivisionClinical HospitalParana Federal UniversityParanaBrazil
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van der Wijst J, Glaudemans B, Venselaar H, Nair AV, Forst AL, Hoenderop JGJ, Bindels RJM. Functional analysis of the Kv1.1 N255D mutation associated with autosomal dominant hypomagnesemia. J Biol Chem 2009; 285:171-8. [PMID: 19903818 DOI: 10.1074/jbc.m109.041517] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mutations in the voltage-gated K(+) channel Kv1.1 have been linked with a mixed phenotype of episodic ataxia and/or myokymia. Recently, we presented autosomal dominant hypomagnesemia as a new phenotypic characteristic associated with a mutation in Kv1.1 (N255D) (Glaudemans, B., van der Wijst, J., Scola, R. H., Lorenzoni, P. J., Heister, A., van der Kemp, A. W., Knoers, N. V., Hoenderop, J. G., and Bindels, R. J. (2009) J. Clin. Invest. 119, 936-942). A conserved asparagine at position 255 in the third transmembrane segment was converted into an aspartic acid, resulting in a non-functional channel. In this study, we explored the functional consequence of this conserved residue by substitution with other hydrophobic, polar, or charged amino acids (N255E, N255Q, N255A, N255V, N255T, and N255H). Upon overexpression in human embryonic kidney (HEK293) cells, cell surface biotinylation revealed plasma membrane expression of all mutant channels. Next, we used the whole-cell patch clamp technique to demonstrate that the N255E and N255Q mutants were non-functional. Substitution of Asn-255 with other amino acids (N255A, N255V, N255T, and N255H) did not prevent ion conduction, and these mutant channels activated at more negative potentials when compared with wild-type channels, -41.5 +/- 1.6, -45.5 +/- 2.0, -50.5 +/- 1.9, and -33.8 +/- 1.3 mV to -29.4 +/- 1.1 mV, respectively. The time constant of activation was significantly faster for the two most hydrophobic mutations, N255A (6.2 +/- 0.2 ms) and N255V (5.2 +/- 0.3 ms), and the hydrophilic mutant N255T (9.8 +/- 0.4 ms) in comparison with wild type (13.0 +/- 0.9 ms). Furthermore, the voltage dependence of inactivation was shifted approximately 13 mV to more negative potentials in all mutant channels except for N255H. Taken together, our data showed that an asparagine at position 255 in Kv1.1 is required for normal voltage dependence and kinetics of channel gating.
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Affiliation(s)
- Jenny van der Wijst
- Department of Physiology, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands
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Glaudemans B, van der Wijst J, Scola R, Lorenzoni PJ, Heister A, van der Kemp A, Knoers NV, Hoenderop JG, Bindels RJ. Rare but Relevant Kidney Disorders. Clin J Am Soc Nephrol 2009. [DOI: 10.2215/01.cjn.0000927056.12668.a8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
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Grünfeld JP, Scholl UI, Bockenhauer D, Glaudemans B, van Bommel EF, Scheel PJ, Delvaeye M, Choi M, Liu T, Ramaekers VT, Häusler MG, Grimmer J, Tobe SW, Farhi A, Nelson-Williams C, Lifton RP, Feather S, Stanescu HC, Bandulik S, Zdebik AA, Reichold M, Tobin J, Lieberer E, Sterner C, Landoure G, Arora R, Sirimanna T, Thompson D, Cross JH, van't Hoff W, Al Masri O, Tullus K, Yeung S, Anikster Y, Klootwijk E, Hubank M, Dillon MJ, Heitzmann D, Arcos-Burgos M, Knepper MA, Dobbie A, Gahl WA, Warth R, Sheridan E, Kleta R, van der Wijst J, Scola R, Lorenzoni PJ, Heister A, van der Kemp A, Knoers NV, Hoenderop JG, Bindels RJ, Jansen I, Hendriksz TR, Aarnoudse AL, Feeley N, Noris M, De Vriese A, Esmon CT, Esmon NL, Ferrell G, Del-Favero J, Plaisance S, Claes B, Lambrechts D, Remuzzi G, Conway EM. Rare but Relevant Kidney DisordersSeizures, sensorineural deafness, ataxia, mental retardation, and electrolyte imbalance (SeSAME syndrome) caused by mutations in KCNJ10. Proc Natl Acad Sci U S A 106: 5842–5847, 2009Epilepsy, ataxia, sensorineural deafness, tubulopathy, and KCNJ10 mutations. N Engl J Med 360: 1960–1970, 2009A missense mutation in the Kv1.1 voltage-gated potassium channel-encoding gene KCNA1 is linked to human autosomal dominant hypomagnesemia. J Clin Invest 119: 936–942, 2009Idiopathic retroperitoneal fibrosis: Prospective evaluation of incidence and clinicoradiologic presentation. Medicine 88: 193–201, 2009Retroperitoneal fibrosis: The clinical, laboratory, and radiographic presentation. Medicine 88: 202–207, 2009Thrombomodulin mutations in atypical hemolytic-uremic syndrome. N Engl J Med 361: 345–357, 2009. Clin J Am Soc Nephrol 2009. [DOI: 10.2215/cjn.06710909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Glaudemans B, van der Wijst J, Scola RH, Lorenzoni PJ, Heister A, van der Kemp AW, Knoers NV, Hoenderop JG, Bindels RJ. A missense mutation in the Kv1.1 voltage-gated potassium channel-encoding gene KCNA1 is linked to human autosomal dominant hypomagnesemia. J Clin Invest 2009; 119:936-42. [PMID: 19307729 DOI: 10.1172/jci36948] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Accepted: 01/07/2009] [Indexed: 02/04/2023] Open
Abstract
Primary hypomagnesemia is a heterogeneous group of disorders characterized by renal or intestinal magnesium (Mg2+) wasting, resulting in tetany, cardiac arrhythmias, and seizures. The kidney plays an essential role in maintaining blood Mg2+ levels, with a prominent function for the Mg2+-transporting channel transient receptor potential cation channel, subfamily M, member 6 (TRPM6) in the distal convoluted tubule (DCT). In the DCT, Mg2+ reabsorption is an active transport process primarily driven by the negative potential across the luminal membrane. Here, we studied a family with isolated autosomal dominant hypomagnesemia and used a positional cloning approach to identify an N255D mutation in KCNA1, a gene encoding the voltage-gated potassium (K+) channel Kv1.1. Kv1.1 was found to be expressed in the kidney, where it colocalized with TRPM6 along the luminal membrane of the DCT. Upon overexpression in a human kidney cell line, patch clamp analysis revealed that the KCNA1 N255D mutation resulted in a nonfunctional channel, with a dominant negative effect on wild-type Kv1.1 channel function. These data suggest that Kv1.1 is a renal K+ channel that establishes a favorable luminal membrane potential in DCT cells to control TRPM6-mediated Mg2+ reabsorption.
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Affiliation(s)
- Bob Glaudemans
- Department of Physiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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