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Deen PMT, Boone M, Schweer H, Olesen ETB, Carmone C, Wetzels JFM, Fenton RA, Kortenoeven MLA. A Vasopressin-Induced Change in Prostaglandin Receptor Subtype Expression Explains the Differential Effect of PGE2 on AQP2 Expression. Front Physiol 2022; 12:787598. [PMID: 35126177 PMCID: PMC8814457 DOI: 10.3389/fphys.2021.787598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/07/2021] [Indexed: 11/20/2022] Open
Abstract
Arginine vasopressin (AVP) stimulates the concentration of renal urine by increasing the principal cell expression of aquaporin-2 (AQP2) water channels. Prostaglandin E2 (PGE2) and prostaglandin2α (PGF2α) increase the water absorption of the principal cell without AVP, but PGE2 decreases it in the presence of AVP. The underlying mechanism of this paradoxical response was investigated here. Mouse cortical collecting duct (mkpCCDc14) cells mimic principal cells as they endogenously express AQP2 in response to AVP. PGE2 increased AQP2 abundance without desmopressin (dDAVP), while in the presence of dDAVP, PGE2, and PGF2α reduced AQP2 abundance. dDAVP increased the cellular PGD2 and PGE2 release and decreased the PGF2α release. MpkCCD cells expressed mRNAs for the receptors of PGE2 (EP1/EP4), PGF2 (FP), and TxB2 (TP). Incubation with dDAVP increased the expression of EP1 and FP but decreased the expression of EP4. In the absence of dDAVP, incubation of mpkCCD cells with an EP4, but not EP1/3, agonist increased AQP2 abundance, and the PGE2-induced increase in AQP2 was blocked with an EP4 antagonist. Moreover, in the presence of dDAVP, an EP1/3, but not EP4, agonist decreased the AQP2 abundance, and the addition of EP1 antagonists prevented the PGE2-mediated downregulation of AQP2. Our study shows that in mpkCCDc14 cells, reduced EP4 receptor and increased EP1/FP receptor expression by dDAVP explains the differential effects of PGE2 and PGF2α on AQP2 abundance with or without dDAVP. As the V2R and EP4 receptor, but not the EP1 and FP receptor, can couple to Gs and stimulate the cyclic adenosine monophosphate (cAMP) pathway, our data support a view that cells can desensitize themselves for receptors activating the same pathway and sensitize themselves for receptors of alternative pathways.
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Affiliation(s)
- Peter M. T. Deen
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | - Michelle Boone
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | - Horst Schweer
- Department of Pediatrics, Philipps-University Marburg, Marburg, Germany
| | - Emma T. B. Olesen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Endocrinology and Nephrology, North Zealand Hospital, Hillerød, Denmark
| | - Claudia Carmone
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | - Jack F. M. Wetzels
- Department of Nephrology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
| | | | - Marleen L. A. Kortenoeven
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, Netherlands
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
- *Correspondence: Marleen L. A. Kortenoeven
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de Groot T, Doty R, Damen L, Baumgarten R, Bressers S, Kraak J, Deen PMT, Korstanje R. Genetic background determines renal response to chronic lithium treatment in female mice. Physiol Genomics 2021; 53:406-415. [PMID: 34378418 DOI: 10.1152/physiolgenomics.00149.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/22/2022] Open
Abstract
Background Chronic lithium treatment for bipolar disease causes mainly side effects in the kidney. A subset of lithium users develops nephrogenic diabetes insipidus (NDI), a urinary concentrating disorder, and chronic kidney disease (CKD). Age, lithium dose and duration of treatment are important risk factors, while genetic background might also play an important role. Methods In order to investigate the role of genetics, female mice of 29 different inbred strains were treated for one year with control or lithium chow and urine, blood and kidneys were analysed. Results Chronic lithium treatment increased urine production and/or reduced urine osmolality in 21 strains. Renal histology showed that lithium increased interstitial fibrosis and/or tubular atrophy in eight strains, while in none of the strains glomerular injury was induced. Interestingly, lithium did not elevate urinary albumin-creatinine ratio (ACR) in any strain, while eight strains even demonstrated a lowered ACR. The protective effect on ACR coincided with a similar decrease in urinary IgG levels, a marker of glomerular function, while the adverse effect of lithium on interstitial fibrosis/tubular atrophy coincided with a severe increase in urinary β2-microglobulin (B2M) levels, an indicator of proximal tubule damage. Conclusion Genetic background plays an important role in the development of lithium-induced NDI and chronic renal pathology in female mice. The strong correlation of renal pathology with urinary B2M levels indicates B2M as a promising biomarker for chronic renal damage induced by lithium.
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Affiliation(s)
- Theun de Groot
- The Jackson Laboratory, Bar Harbor, Maine, United States.,Radboud University Medical Center, Nijmegen, The Netherlands
| | - Rosalinda Doty
- The Jackson Laboratory, Bar Harbor, Maine, United States
| | - Lars Damen
- Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Steffi Bressers
- Radboud University Medical Center, Nijmegen, The Netherlands
| | - Joline Kraak
- The Jackson Laboratory, Bar Harbor, Maine, United States.,Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Ron Korstanje
- The Jackson Laboratory, Bar Harbor, Maine, United States
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Dona M, Waaijers S, Richter S, Eisenhofer G, Korving J, Kamel SM, Bakkers J, Rapizzi E, Rodenburg RJ, Zethof J, Gorissen M, Flik G, Deen PMT, Timmers HJLM. Loss of sdhb in zebrafish larvae recapitulates human paraganglioma characteristics. Endocr Relat Cancer 2021; 28:65-77. [PMID: 33156815 DOI: 10.1530/erc-20-0308] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 11/06/2020] [Indexed: 11/08/2022]
Abstract
Pheochromocytomas and paragangliomas (PPGLs) caused by mutations in the B-subunit of the succinate dehydrogenase (SDHB) have the highest metastatic rate among PPGLs, and effective systemic therapy is lacking. To unravel underlying pathogenic mechanisms, and to evaluate therapeutic strategies, suitable in vivo models are needed. The available systemic Sdhb knock-out mice cannot model the human PPGL phenotype: heterozygous Sdhb mice lack a disease phenotype, and homozygous Sdhb mice are embryonically lethal. Using CRISPR/cas9 technology, we introduced a protein-truncating germline lesion into the zebrafish sdhb gene. Heterozygous sdhb mutants were viable and displayed no obvious morphological or developmental defects. Homozygous sdhb larvae were viable, but exhibited a decreased lifespan. Morphological analysis revealed incompletely or non-inflated swim bladders in homozygous sdhb mutants at day 6. Although no differences in number and ultrastructure of the mitochondria were observed. Clear defects in energy metabolism and swimming behavior were observed in homozygous sdhb mutant larvae. Functional and metabolomic analyses revealed decreased mitochondrial complex 2 activity and significant succinate accumulation in the homozygous sdhb mutant larvae, mimicking the metabolic effects observed in SDHB-associated PPGLs. This is the first study to present a vertebrate animal model that mimics metabolic effects of SDHB-associated PPGLs. This model will be useful in unraveling pathomechanisms behind SDHB-associated PPGLs. We can now study the metabolic effects of sdhb disruption during different developmental stages and develop screening assays to identify novel therapeutic targets in vivo. Besides oncological syndromes, our model might also be useful for pediatric mitochondrial disease caused by loss of the SDHB gene.
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Affiliation(s)
- Margo Dona
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Selma Waaijers
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Susan Richter
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Medical Faculty Carl Gustav Carus, Technische Universitat Dresden, Dresden, Germany
| | - Graeme Eisenhofer
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Medical Faculty Carl Gustav Carus, Technische Universitat Dresden, Dresden, Germany
- Department of Medicine ΙΙΙ, University Hospital Dresden, Dresden, Germany
| | - Jeroen Korving
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences and University Medical Center Utrecht, Utrecht, the Netherlands
| | - Sarah M Kamel
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences and University Medical Center Utrecht, Utrecht, the Netherlands
| | - Jeroen Bakkers
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences and University Medical Center Utrecht, Utrecht, the Netherlands
- Division of Heart and Lungs, Department of Medical Physiology, UMC Utrecht, Utrecht, the Netherlands
| | - Elena Rapizzi
- Department of Biomedical, Experimental and Clinical Sciences 'Mario Serio', University of Florence, Firenze, Italy
| | - Richard J Rodenburg
- Department of Pediatrics, Radboud Center for Mitochondrial Medicine, Translational Metabolic Laboratory, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Jan Zethof
- Department of Animal Ecology and Physiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands
| | - Marnix Gorissen
- Department of Animal Ecology and Physiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands
| | - Gert Flik
- Department of Animal Ecology and Physiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands
| | | | - Henri J L M Timmers
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
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4
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Matlac DM, Hadrava Vanova K, Bechmann N, Richter S, Folberth J, Ghayee HK, Ge GB, Abunimer L, Wesley R, Aherrahrou R, Dona M, Martínez-Montes ÁM, Calsina B, Merino MJ, Schwaninger M, Deen PMT, Zhuang Z, Neuzil J, Pacak K, Lehnert H, Fliedner SMJ. Succinate Mediates Tumorigenic Effects via Succinate Receptor 1: Potential for New Targeted Treatment Strategies in Succinate Dehydrogenase Deficient Paragangliomas. Front Endocrinol (Lausanne) 2021; 12:589451. [PMID: 33776908 PMCID: PMC7994772 DOI: 10.3389/fendo.2021.589451] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 01/29/2021] [Indexed: 12/12/2022] Open
Abstract
Paragangliomas and pheochromocytomas (PPGLs) are chromaffin tumors associated with severe catecholamine-induced morbidities. Surgical removal is often curative. However, complete resection may not be an option for patients with succinate dehydrogenase subunit A-D (SDHx) mutations. SDHx mutations are associated with a high risk for multiple recurrent, and metastatic PPGLs. Treatment options in these cases are limited and prognosis is dismal once metastases are present. Identification of new therapeutic targets and candidate drugs is thus urgently needed. Previously, we showed elevated expression of succinate receptor 1 (SUCNR1) in SDHB PPGLs and SDHD head and neck paragangliomas. Its ligand succinate has been reported to accumulate due to SDHx mutations. We thus hypothesize that autocrine stimulation of SUCNR1 plays a role in the pathogenesis of SDHx mutation-derived PPGLs. We confirmed elevated SUCNR1 expression in SDHx PPGLs and after SDHB knockout in progenitor cells derived from a human pheochromocytoma (hPheo1). Succinate significantly increased viability of SUCNR1-transfected PC12 and ERK pathway signaling compared to control cells. Candidate SUCNR1 inhibitors successfully reversed proliferative effects of succinate. Our data reveal an unrecognized oncometabolic function of succinate in SDHx PPGLs, providing a growth advantage via SUCNR1.
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Affiliation(s)
- Dieter M. Matlac
- Neuroendocrine Oncology and Metabolism, Medical Department I, Center of Brain, Behavior, and Metabolism, University Medical Center Schleswig-Holstein Lübeck, Lübeck, Germany
| | - Katerina Hadrava Vanova
- Institute of Biotechnology, Czech Academy of Sciences, Prague-West, Czechia
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, United States
| | - Nicole Bechmann
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Medical Faculty Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Susan Richter
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Medical Faculty Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Julica Folberth
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Hans K. Ghayee
- Department of Medicine, Division of Endocrinology, University of Florida and Malcom Randall VA Medical Center, Gainesville, FL, United States
| | - Guang-Bo Ge
- Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Luma Abunimer
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, United States
| | | | - Redouane Aherrahrou
- Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
- Department of Biomedical Engineering, Centre for Public Health Genomics, University of Virginia, Charlottesville, VA, United States
| | - Margo Dona
- Division of Endocrinology 471, Department of Internal Medicine, Radboud University Medical Center, Nijmegen, Netherlands
| | - Ángel M. Martínez-Montes
- Hereditary Endocrine Cancer Group, Human Cancer Genetics Program, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Bruna Calsina
- Hereditary Endocrine Cancer Group, Human Cancer Genetics Program, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Maria J. Merino
- Laboratory of Surgical Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States
| | - Markus Schwaninger
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | | | - Zhengping Zhuang
- Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States
| | - Jiri Neuzil
- Institute of Biotechnology, Czech Academy of Sciences, Prague-West, Czechia
- School of Medical Science, Griffith University, Southport, QLD, Australia
| | - Karel Pacak
- Section on Medical Neuroendocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, United States
| | - Hendrik Lehnert
- Neuroendocrine Oncology and Metabolism, Medical Department I, Center of Brain, Behavior, and Metabolism, University Medical Center Schleswig-Holstein Lübeck, Lübeck, Germany
| | - Stephanie M. J. Fliedner
- Neuroendocrine Oncology and Metabolism, Medical Department I, Center of Brain, Behavior, and Metabolism, University Medical Center Schleswig-Holstein Lübeck, Lübeck, Germany
- *Correspondence: Stephanie M. J. Fliedner,
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5
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Genzel L, Adan R, Berns A, van den Beucken JJJP, Blokland A, Boddeke EHWGM, Bogers WM, Bontrop R, Bulthuis R, Bousema T, Clevers H, Coenen TCJJ, van Dam AM, Deen PMT, van Dijk KW, Eggen BJL, Elgersma Y, Erdogan I, Englitz B, Fentener van Vlissingen JM, la Fleur S, Fouchier R, Fitzsimons CP, Frieling W, Haagmans B, Heesters BA, Henckens MJAG, Herfst S, Hol E, van den Hove D, de Jonge MI, Jonkers J, Joosten LAB, Kalsbeek A, Kamermans M, Kampinga HH, Kas MJ, Keijer J, Kersten S, Kiliaan AJ, Kooij TWA, Kooijman S, Koopman WJH, Korosi A, Krugers HJ, Kuiken T, Kushner SA, Langermans JAM, Lesscher HMB, Lucassen PJ, Lutgens E, Netea MG, Noldus LPJJ, van der Meer JWM, Meye FJ, Mul JD, van Oers K, Olivier JDA, Pasterkamp RJ, Philippens IHCHM, Prickaerts J, Pollux BJA, Rensen PCN, van Rheenen J, van Rij RP, Ritsma L, Rockx BHG, Roozendaal B, van Schothorst EM, Stittelaar K, Stockhofe N, Swaab DF, de Swart RL, Vanderschuren LJMJ, de Vries TJ, de Vrij F, van Wezel R, Wierenga CJ, Wiesmann M, Willuhn I, de Zeeuw CI, Homberg JR. How the COVID-19 pandemic highlights the necessity of animal research. Curr Biol 2020; 30:4328. [PMID: 33142090 PMCID: PMC7605800 DOI: 10.1016/j.cub.2020.10.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Louer EMM, Yi G, Carmone C, Robben J, Stunnenberg HG, den Hollander AI, Deen PMT. Genes Involved in Energy Metabolism Are Differentially Expressed During the Day-Night Cycle in Murine Retinal Pigment Epithelium. Invest Ophthalmol Vis Sci 2020; 61:49. [PMID: 32460311 PMCID: PMC7405837 DOI: 10.1167/iovs.61.5.49] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Purpose The functional interaction between photoreceptors and retinal pigment epithelium (RPE) cells is essential for vision. Phagocytosis of photoreceptor outer segments (POSs) by the RPE follows a circadian pattern; however, it remains unknown whether other RPE processes follow a daily rhythm. Therefore, our aim was to identify RPE processes following a daily rhythm. Methods Murine RPE was isolated at Zeitgeber time (ZT) 0, 2, 4, 9, 14, and 19 (n = 5 per time point), after which RNA was isolated and sequenced. Genes with a significant difference in expression between time points (P < 0.05) were subjected to EnrichR pathway analysis to identify daily rhythmic processes. Results Pathway enrichment revealed 13 significantly enriched KEGG pathways (P < 0.01), including the metabolic pathway (P = 0.002821). Analysis of the metabolic pathway differentially expressed genes revealed that genes involved in adenosine triphosphate production, glycolysis, glycogenolysis, and glycerophospholipid were low at ZT0 (light onset) and high at ZT19 (night). Genes involved in fatty acid degradation and cholesterol synthesis were high at light onset and low at night. Conclusions Our transcriptome data suggest that the highest energy demand of RPE cells is at night, whereas POS phagocytosis and degradation take place in the morning. Furthermore, we identified genes involved in fatty acid and glycerophospholipid synthesis that are upregulated at night, possibly playing a role in generating building blocks for membrane synthesis.
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7
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Genzel L, Adan R, Berns A, van den Beucken JJJP, Blokland A, Boddeke EHWGM, Bogers WM, Bontrop R, Bulthuis R, Bousema T, Clevers H, Coenen TCJJ, van Dam AM, Deen PMT, van Dijk KW, Eggen BJL, Elgersma Y, Erdogan I, Englitz B, Fentener van Vlissingen JM, la Fleur S, Fouchier R, Fitzsimons CP, Frieling W, Haagmans B, Heesters BA, Henckens MJAG, Herfst S, Hol E, van den Hove D, de Jonge MI, Jonkers J, Joosten LAB, Kalsbeek A, Kamermans M, Kampinga HH, Kas MJ, Keijer JA, Kersten S, Kiliaan AJ, Kooij TWA, Kooijman S, Koopman WJH, Korosi A, Krugers HJ, Kuiken T, Kushner SA, Langermans JAM, Lesscher HMB, Lucassen PJ, Lutgens E, Netea MG, Noldus LPJJ, van der Meer JWM, Meye FJ, Mul JD, van Oers K, Olivier JDA, Pasterkamp RJ, Philippens IHCHM, Prickaerts J, Pollux BJA, Rensen PCN, van Rheenen J, van Rij RP, Ritsma L, Rockx BHG, Roozendaal B, van Schothorst EM, Stittelaar K, Stockhofe N, Swaab DF, de Swart RL, Vanderschuren LJMJ, de Vries TJ, de Vrij F, van Wezel R, Wierenga CJ, Wiesmann M, Willuhn I, de Zeeuw CI, Homberg JR. How the COVID-19 pandemic highlights the necessity of animal research. Curr Biol 2020; 30:R1014-R1018. [PMID: 32961149 PMCID: PMC7416712 DOI: 10.1016/j.cub.2020.08.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Recently, a petition was offered to the European Commission calling for an immediate ban on animal testing. Although a Europe-wide moratorium on the use of animals in science is not yet possible, there has been a push by the non-scientific community and politicians for a rapid transition to animal-free innovations. Although there are benefits for both animal welfare and researchers, advances on alternative methods have not progressed enough to be able to replace animal research in the foreseeable future. This trend has led first and foremost to a substantial increase in the administrative burden and hurdles required to make timely advances in research and treatments for human and animal diseases. The current COVID-19 pandemic clearly highlights how much we actually rely on animal research. COVID-19 affects several organs and systems, and the various animal-free alternatives currently available do not come close to this complexity. In this Essay, we therefore argue that the use of animals is essential for the advancement of human and veterinary health.
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Affiliation(s)
- Lisa Genzel
- Radboud University, 6525 XZ Nijmegen, The Netherlands.
| | - Roger Adan
- University Medical Center, Utrecht Brain Center, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Anton Berns
- Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
| | | | - Arjan Blokland
- Maastricht University, 6211 LK Maastricht, The Netherlands
| | - Erik H W G M Boddeke
- University of Groningen, 9712 CP Groningen, The Netherlands; University of Groningen, University Medical Center, 9713 GZ Groningen, The Netherlands
| | - Willy M Bogers
- Biomedical Primate Research Centre, 2288 GJ Rijswijk, The Netherlands
| | - Ronald Bontrop
- Biomedical Primate Research Centre, 2288 GJ Rijswijk, The Netherlands
| | - R Bulthuis
- Metris BV, 2132 NG Hoofddorp, The Netherlands
| | - Teun Bousema
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Hans Clevers
- University Medical Center, 3584 CX Utrecht, The Netherlands
| | | | - Anne-Marie van Dam
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands
| | | | - K W van Dijk
- Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Bart J L Eggen
- University of Groningen, 9712 CP Groningen, The Netherlands; University of Groningen, University Medical Center, 9713 GZ Groningen, The Netherlands
| | - Ype Elgersma
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Izel Erdogan
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | | | | | - Susanne la Fleur
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands; Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
| | - Ron Fouchier
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Carlos P Fitzsimons
- Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | | | - Bart Haagmans
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Balthasar A Heesters
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands
| | | | - Sander Herfst
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Elly Hol
- University Medical Center, Utrecht Brain Center, Utrecht University, 3584 CG Utrecht, The Netherlands
| | | | - Marien I de Jonge
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Jos Jonkers
- Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands; Oncode Institute, 3521 AL Utrecht, The Netherlands
| | - Leo A B Joosten
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Andries Kalsbeek
- Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
| | - Maarten Kamermans
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands; Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
| | - Harm H Kampinga
- University of Groningen, University Medical Center, 9713 GZ Groningen, The Netherlands
| | - Martien J Kas
- University of Groningen, 9712 CP Groningen, The Netherlands
| | - J Aap Keijer
- Wageningen University, 6700 AH Wageningen, The Netherlands
| | - Sander Kersten
- Wageningen University, 6700 AH Wageningen, The Netherlands
| | - Amanda J Kiliaan
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Taco W A Kooij
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Sander Kooijman
- Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | | | - Aniko Korosi
- Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Harm J Krugers
- Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Thijs Kuiken
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Steven A Kushner
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Jan A M Langermans
- Biomedical Primate Research Centre, 2288 GJ Rijswijk, The Netherlands; Utrecht University, 3584 CS Utrecht, The Netherlands
| | | | - Paul J Lucassen
- Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Esther Lutgens
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands
| | - Mihai G Netea
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; Life and Medical Sciences Institute, University of Bonn, 53115 Bonn, Germany
| | | | | | - Frank J Meye
- University Medical Center, Utrecht Brain Center, Utrecht University, 3584 CG Utrecht, The Netherlands
| | - Joram D Mul
- Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
| | - Kees van Oers
- Wageningen University, 6700 AH Wageningen, The Netherlands; Netherlands Institute of Ecology(NIOO-KNAW), 6700 AB Wageningen, The Netherlands
| | | | - R Jeroen Pasterkamp
- University Medical Center, Utrecht Brain Center, Utrecht University, 3584 CG Utrecht, The Netherlands
| | | | - Jos Prickaerts
- Maastricht University, 6211 LK Maastricht, The Netherlands
| | - B J A Pollux
- Wageningen University, 6700 AH Wageningen, The Netherlands
| | | | | | - Ronald P van Rij
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Laila Ritsma
- Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Barry H G Rockx
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | - Benno Roozendaal
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | | | - K Stittelaar
- Viroclinics Xplore, 5374 RE Schaijk, The Netherlands
| | - Norbert Stockhofe
- Wageningen University, 6700 AH Wageningen, The Netherlands; Wageningen Bioveterinary Research, 8221 RA Lelystad, The Netherlands
| | - Dick F Swaab
- Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
| | - Rik L de Swart
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | | | - Taco J de Vries
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands
| | - Femke de Vrij
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands
| | | | | | | | - Ingo Willuhn
- Amsterdam UMC, location VU University Medical Center, De Boelelaan 1105, 1081 HZ Amsterdam, The Netherlands; Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
| | - Chris I de Zeeuw
- Erasmus University Medical Center, 3015 GD Rotterdam, The Netherlands; Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
| | - Judith R Homberg
- Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands.
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8
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de Groot T, Ebert LK, Christensen BM, Andralojc K, Cheval L, Doucet A, Mao C, Baumgarten R, Low BE, Sandhoff R, Wiles MV, Deen PMT, Korstanje R. Identification of Acer2 as a First Susceptibility Gene for Lithium-Induced Nephrogenic Diabetes Insipidus in Mice. J Am Soc Nephrol 2019; 30:2322-2336. [PMID: 31558682 DOI: 10.1681/asn.2018050549] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 05/26/2018] [Accepted: 08/07/2019] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Lithium, mainstay treatment for bipolar disorder, causes nephrogenic diabetes insipidus and hypercalcemia in about 20% and 10% of patients, respectively, and may lead to acidosis. These adverse effects develop in only a subset of patients treated with lithium, suggesting genetic factors play a role. METHODS To identify susceptibility genes for lithium-induced adverse effects, we performed a genome-wide association study in mice, which develop such effects faster than humans. On day 8 and 10 after assigning female mice from 29 different inbred strains to normal chow or lithium diet (40 mmol/kg), we housed the animals for 48 hours in metabolic cages for urine collection. We also collected blood samples. RESULTS In 17 strains, lithium treatment significantly elevated urine production, whereas the other 12 strains were not affected. Increased urine production strongly correlated with lower urine osmolality and elevated water intake. Lithium caused acidosis only in one mouse strain, whereas hypercalcemia was found in four strains. Lithium effects on blood pH or ionized calcium did not correlate with effects on urine production. Using genome-wide association analyses, we identified eight gene-containing loci, including a locus containing Acer2, which encodes a ceramidase and is specifically expressed in the collecting duct. Knockout of Acer2 led to increased susceptibility for lithium-induced diabetes insipidus development. CONCLUSIONS We demonstrate that genome-wide association studies in mice can be used successfully to identify susceptibility genes for development of lithium-induced adverse effects. We identified Acer2 as a first susceptibility gene for lithium-induced diabetes insipidus in mice.
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Affiliation(s)
- Theun de Groot
- The Jackson Laboratory, Bar Harbor, Maine.,Departments of Physiology.,Department of Medical Microbiology and Infectious Diseases, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
| | - Lena K Ebert
- The Jackson Laboratory, Bar Harbor, Maine.,Departments of Physiology.,Department II of Internal Medicine, Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | | | - Karolina Andralojc
- Molecular Biology.,Biochemistry, and.,Medical Microbiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Lydie Cheval
- Cordeliers Research Center, Sorbonne University, Pierre and Marie Curie University Paris 06, INSERM (Institut National de la Santé et de la Recherche Médicale), Paris Descartes University, Sorbonne Paris Cité, UMR_S (Unité Mixte de Recherche en Sciences) 1138, Paris, France.,Physiology of Renal and Tubulopathies, CNRS (Centre National de la Recherche Scientifique) ERL 8228, Cordeliers Research Center, INSERM, Sorbonne University, Sorbonne Paris Cité University, Paris Descartes University, Paris Diderot University, Paris, France
| | - Alain Doucet
- Cordeliers Research Center, Sorbonne University, Pierre and Marie Curie University Paris 06, INSERM (Institut National de la Santé et de la Recherche Médicale), Paris Descartes University, Sorbonne Paris Cité, UMR_S (Unité Mixte de Recherche en Sciences) 1138, Paris, France
| | - Cungui Mao
- Department of Medicine, Stony Brook University, Stony Brook, New York.,Stony Brook Cancer Center, Stony Brook, New York
| | | | | | - Roger Sandhoff
- Lipid Pathobiochemistry Group, Department of Cellular and Molecular Pathology, German Cancer Research Center (DKFZ), Heidelberg, Germany; and.,Centre for Applied Sciences at Technical Universities (ZAFH)-Applied Biomedical Mass Spectrometry (ABIMAS), Mannheim, Germany
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9
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Louer EMM, Lorés-Motta L, Ion AM, Den Hollander AI, Deen PMT. Single nucleotide polymorphism rs13079080 is associated with differential regulation of the succinate receptor 1 (SUCNR1) gene by miRNA-4470. RNA Biol 2019; 16:1547-1554. [PMID: 31304868 PMCID: PMC6779389 DOI: 10.1080/15476286.2019.1643100] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Oxidative stress is a feature of many common diseases. It leads to excessive formation and subsequent release of the mitochondrial metabolite succinate, which acts as a signalling molecule through binding the succinate receptor (SUCNR1). Recently, a potential role for SUCNR1 was proposed in age-related macular degeneration (AMD), a common cause of vision loss in the elderly associated with increased oxidative stress. Here, we evaluated the potential effect of genetic variants in SUCNR1 on its expression through differential micro-RNA (miRNA) binding to target mRNA, and investigated the relevance of altered SUCNR1 expression in AMD pathogenesis. We analysed common SUCNR1 SNPs for potential miRNA binding sites and identified rs13079080, located in the 3'-UTR and binding site for miRNA-4470. Both miRNA-4470 and SUCNR1 were found to be expressed in human retina. Moreover, using a luciferase reporter assay, a 60% decrease in activity was observed when miRNA-4470 was co-expressed with the C allele compared to the T allele of rs13079080. Finally, genotyping rs13079080 in an AMD case-control cohort revealed a protective effect of the TT genotype on AMD compared to the CC genotype (p = 0.007, odds ratio = 0.66). However, the association was not confirmed in the case-control study of the International AMD Genomics Consortium. Our study demonstrates that the T allele of rs13079080 in SUCNR1 disrupts a binding site for miRNA-4470, potentially increasing SUCNR1 expression and consequently increasing the capacity of sensing and dealing with oxidative stress. Therefore, it would be worthwhile assessing the relevance of rs13079080 in other oxidative stress-associated diseases in future studies.
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Affiliation(s)
- Elja M M Louer
- Dept of Physiology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center , Nijmegen , The Netherlands.,Dept of Ophthalmology, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Laura Lorés-Motta
- Dept of Ophthalmology, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Ana Mãdãlina Ion
- Dept of Physiology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center , Nijmegen , The Netherlands.,Dept of Ophthalmology, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Anneke I Den Hollander
- Dept of Ophthalmology, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center , Nijmegen , The Netherlands.,Dept of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Peter M T Deen
- Dept of Physiology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center , Nijmegen , The Netherlands
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10
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Doornebal J, Diepenbroek A, van de Luijtgaarden MWM, Hartong EGTM, Grootens KP, Kupka RW, Klumpers UMH, Deen PMT, Gaillard CA, Wetzels JFM. Renal concentrating ability and glomerular filtration rate in lithium-treated patients. Neth J Med 2019; 77:139-149. [PMID: 31502545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
BACKGROUND Lithium is the most effective drug for mood stabilization in bipolar disorder. However, lithium exposure has been associated with an impaired renal concentrating ability (RCA) and glomerular filtration rate (GFR). We examined RCA and estimated GFR in a cohort of patients treated with lithium. METHODS 134 patients (≥ 18 years of age) with a mood disorder treated with lithium were screened; 100 patients were included. Demographic and clinical characteristics and blood and urine samples were collected. Additionally, a dDAVP-test was performed to determine maximal RCA. RESULTS A dDAVP-test was performed in 98 patients (37 males, 61 females). Mean age was 51 years (SD: 12), median duration of lithium therapy 7 years (IQR: 4-15), mean maximal urine osmolality (Uosmol) 725 mOsmol/kg (SD: 153), and median eGFR 84 ml/min/1.73 m2 (IQR: 68-95). Fifty patients (51%) had an impaired RCA and 17 patients (17%) had nephrogenic diabetes insipidus (Uosmol 600-800 and < 600 mOsmol/kg, respectively). Notably, clinical symptoms did not predict an impaired RCA. Nineteen patients (19%) had an eGFR ≤ 60 ml/min/ 1.73 m2. Multivariable regression analysis showed a significant association between the duration of lithium treatment and maximal Uosmol (B = -6.1, 95%-CI: -9.4, -2.9, p < 0.001) and eGFR (B = -0.6, 95%-CI: 0.2, -3.3; p < 0.01). CONCLUSIONS RCA is impaired in the majority of lithium-treated patients. Both RCA and eGFR are inversely associated with the duration of lithium therapy. Prospective follow-up will enable us to evaluate if abnormalities in RCA can be used to predict the development of lithium-induced chronic kidney disease.
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11
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Bijkerk R, Trimpert C, van Solingen C, de Bruin RG, Florijn BW, Kooijman S, van den Berg R, van der Veer EP, Bredewold EOW, Rensen PCN, Rabelink TJ, Humphreys BD, Deen PMT, van Zonneveld AJ. MicroRNA-132 controls water homeostasis through regulating MECP2-mediated vasopressin synthesis. Am J Physiol Renal Physiol 2018; 315:F1129-F1138. [DOI: 10.1152/ajprenal.00087.2018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Fine-tuning of the body’s water balance is regulated by vasopressin (AVP), which induces the expression and apical membrane insertion of aquaporin-2 water channels and subsequent water reabsorption in the kidney. Here we demonstrate that silencing of microRNA-132 (miR-132) in mice causes severe weight loss due to acute diuresis coinciding with increased plasma osmolality, reduced renal total and plasma membrane expression of aquaporin-2, and abrogated increase in AVP levels. Infusion with synthetic AVP fully reversed the antagomir-132-induced diuresis, and low-dose intracerebroventricular administration of antagomir-132 similarly caused acute diuresis. Central and intracerebroventricular antagomir-132 injection both decreased hypothalamic AVP mRNA levels. At the molecular level, antagomir-132 increased the in vivo and in vitro mRNA expression of methyl-CpG-binding protein-2 (MECP2), which is a miR-132 target and which blocks AVP gene expression by binding its enhancer region. In line with this, treatment of hypothalamic N6 cells with a high-salt solution increased its miR-132 levels, whereas it attenuated endogenous Mecp2 mRNA levels. In conclusion, we identified miR-132 as a first miRNA regulating the osmotic balance by regulating the hypothalamic AVP gene mRNA expression.
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Affiliation(s)
- Roel Bijkerk
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
- Renal Division, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, Massachusetts
| | - Christiane Trimpert
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Coen van Solingen
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
- Marc and Ruti Bell Vascular Biology and Disease Program, Leon H. Charney Division of Cardiology, Department of Medicine, New York University Medical Center, New York, New York
| | - Ruben G. de Bruin
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Barend W. Florijn
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Sander Kooijman
- Department of Internal Medicine (Endocrinology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Rosa van den Berg
- Department of Internal Medicine (Endocrinology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Eric P. van der Veer
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Edwin O. W. Bredewold
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Patrick C. N. Rensen
- Department of Internal Medicine (Endocrinology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Ton J. Rabelink
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Benjamin D. Humphreys
- Renal Division, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, Massachusetts
- Renal Division, Washington University School of Medicine, St. Louis, Missouri
| | - Peter M. T. Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Anton Jan van Zonneveld
- Department of Internal Medicine (Nephrology) and the Einthoven Laboratory for Vascular and Regenerative Medicine, Leiden University Medical Center, Leiden, The Netherlands
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12
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Bongers CCWG, Alsady M, Nijenhuis T, Tulp ADM, Eijsvogels TMH, Deen PMT, Hopman MTE. Impact of acute versus prolonged exercise and dehydration on kidney function and injury. Physiol Rep 2018; 6:e13734. [PMID: 29890037 PMCID: PMC5995308 DOI: 10.14814/phy2.13734] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Revised: 05/18/2018] [Accepted: 05/18/2018] [Indexed: 01/17/2023] Open
Abstract
Exercise and dehydration may be associated with a compromised kidney function and potential signs of kidney injury. However, the kidney responses to exercise of different durations and hypohydration levels are not yet known. Therefore, we aimed to compare the effects of acute versus prolonged exercise and dehydration on estimated glomerular filtration rate (eGFR) and kidney injury biomarkers in healthy male adults. A total of 35 subjects (23 ± 3 years) were included and invited for two study visits. Visit 1 consisted of a maximal cycling test. On Visit 2, subjects performed a submaximal exercise test at 80% of maximal heart rate until 3% hypohydration. Blood and urine samples were taken at baseline, after 30 min of exercise (acute effects; low level of hypohydration) and after 150 min of exercise or when 3% hypohydration was achieved (prolonged effects, high level of hypohydration). Urinary outcome parameters were corrected for urinary cystatin C, creatinine, and osmolality. Subjects dehydrated on average 0.6 ± 0.3% and 2.9 ± 0.7% after acute and prolonged exercise, respectively (P < 0.001). The eGFRcystatin C did not differ between baseline and acute exercise (118 ± 11 vs. 116 ± 12 mL/min/1.73 m2 , P = 0.12), whereas eGFRcystatin C was significantly lower after prolonged exercise (103 ± 16 mL/min/1.73 m2 , P < 0.001). We found no difference in osmolality corrected uKIM1 concentrations after acute and prolonged exercise (P > 0.05), and elevated osmolality corrected uNGAL concentrations after acute and prolonged exercise (all P-values < 0.05). In conclusion, acute exercise did barely impact on eGFRcystatin C and kidney injury biomarkers, whereas prolonged exercise is associated with a decline in eGFRcystatin C and increased biomarkers for kidney injury.
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Affiliation(s)
- Coen C. W. G. Bongers
- Department of PhysiologyRadboud Institute for Health SciencesRadboud University Medical CenterNijmegenThe Netherlands
| | - Mohammad Alsady
- Department of PhysiologyRadboud Institute for Molecular Life SciencesRadboud University Medical CenterNijmegenThe Netherlands
| | - Tom Nijenhuis
- Department of NephrologyRadboud Institute for Molecular Life SciencesRadboud University Medical CenterNijmegenThe Netherlands
| | - Anouk D. M. Tulp
- Department of PhysiologyRadboud Institute for Health SciencesRadboud University Medical CenterNijmegenThe Netherlands
| | - Thijs M. H. Eijsvogels
- Department of PhysiologyRadboud Institute for Health SciencesRadboud University Medical CenterNijmegenThe Netherlands
- Research Institute for Sports and Exercise SciencesLiverpool John Moores UniversityLiverpoolUnited Kingdom
| | - Peter M. T. Deen
- Department of PhysiologyRadboud Institute for Molecular Life SciencesRadboud University Medical CenterNijmegenThe Netherlands
| | - Maria T. E. Hopman
- Department of PhysiologyRadboud Institute for Health SciencesRadboud University Medical CenterNijmegenThe Netherlands
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13
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Lee JW, Alsady M, Chou CL, de Groot T, Deen PMT, Knepper MA, Ecelbarger CM. Single-tubule RNA-Seq uncovers signaling mechanisms that defend against hyponatremia in SIADH. Kidney Int 2018; 93:128-146. [PMID: 28843412 PMCID: PMC5750119 DOI: 10.1016/j.kint.2017.06.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 06/01/2017] [Accepted: 06/08/2017] [Indexed: 01/30/2023]
Abstract
In the syndrome of inappropriate antidiuretic hormone secretion (SIADH), hyponatremia is limited by onset of vasopressin-escape caused by loss of the water channel aquaporin-2 in the renal collecting duct despite high circulating vasopressin. Here, we use the methods of systems biology in a well-established rat model of SIADH to identify signaling pathways activated at the onset of vasopressin-escape. Using single-tubule RNA-Seq, full transcriptomes were determined in microdissected cortical collecting ducts of vasopressin-treated rats at 1, 2, and 4 days after initiation of oral water loading in comparison to time-control rats without water loading. The time-dependent mRNA abundance changes were mapped to gene sets associated with curated canonical signaling pathways and revealed evidence of perturbation of transforming growth factor β signaling and epithelial-to-mesenchymal transition on Day 1 of water loading simultaneous with the initial fall in Aqp2 gene expression. On Day 2 of water loading, transcriptomic changes mapped to Notch signaling and the transition from G0 into the cell cycle but arrest at the G2/M stage. There was no evidence of cell proliferation or altered principal or intercalated cell numbers. Exposure of vasopressin-treated cultured mpkCCD cells to transforming growth factor β resulted in a virtually complete loss of aquaporin-2. Thus, there is a partial epithelial-to-mesenchymal transition during vasopressin escape with a subsequent shift from quiescence into the cell cycle with eventual arrest and loss of aquaporin-2.
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MESH Headings
- Animals
- Aquaporin 2/genetics
- Aquaporin 2/metabolism
- Cell Proliferation/genetics
- Cells, Cultured
- Cellular Senescence/genetics
- Deamino Arginine Vasopressin
- Disease Models, Animal
- Drinking
- Epithelial-Mesenchymal Transition/genetics
- Gene Expression Profiling/methods
- Gene Expression Regulation
- Hyponatremia/etiology
- Hyponatremia/genetics
- Hyponatremia/metabolism
- Hyponatremia/prevention & control
- Inappropriate ADH Syndrome/chemically induced
- Inappropriate ADH Syndrome/genetics
- Inappropriate ADH Syndrome/metabolism
- Kidney Tubules, Collecting/metabolism
- Male
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats, Sprague-Dawley
- Receptors, Notch/genetics
- Receptors, Notch/metabolism
- Sequence Analysis, RNA
- Signal Transduction/genetics
- Systems Biology/methods
- Time Factors
- Transcription, Genetic
- Transcriptome
- Transforming Growth Factor beta/genetics
- Transforming Growth Factor beta/metabolism
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Affiliation(s)
- Jae Wook Lee
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA; Nephrology Clinic, National Cancer Center, Goyang, Gyeonggi-do, South Korea
| | - Mohammad Alsady
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Chung-Lin Chou
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Theun de Groot
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Peter M T Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Mark A Knepper
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Carolyn M Ecelbarger
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA; Division of Endocrinology and Metabolism, Department of Medicine, Georgetown University, Washington, District of Columbia, USA.
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14
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de Groot T, Damen L, Kosse L, Alsady M, Doty R, Baumgarten R, Sheehan S, van der Vlag J, Korstanje R, Deen PMT. Lithium reduces blood glucose levels, but aggravates albuminuria in BTBR-ob/ob mice. PLoS One 2017; 12:e0189485. [PMID: 29244860 PMCID: PMC5731748 DOI: 10.1371/journal.pone.0189485] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 11/27/2017] [Indexed: 01/13/2023] Open
Abstract
Glycogen synthase kinase 3 (GSK3) plays an important role in the development of diabetes mellitus and renal injury. GSK3 inhibition increases glucose uptake in insulin-insensitive muscle and adipose tissue, while it reduces albuminuria and glomerulosclerosis in acute kidney injury. The effect of chronic GSK3 inhibition in diabetic nephropathy is not known. We tested the effect of lithium, the only clinical GSK3 inhibitor, on the development of diabetes mellitus and kidney injury in a mouse model of diabetic nephropathy. Twelve-week old female BTBR-ob/ob mice were treated for 12 weeks with 0, 10 and 40 mmol LiCl/kg after which the development of diabetes and diabetic nephropathy were analysed. In comparison to BTBR-WT mice, ob/ob mice demonstrated elevated bodyweight, increased blood glucose/insulin levels, urinary albumin and immunoglobulin G levels, glomerulosclerosis, reduced nephrin abundance and a damaged proximal tubule brush border. The lithium-10 and -40 diets did not affect body weight and resulted in blood lithium levels of respectively <0.25 mM and 0.48 mM. The Li-40 diet fully rescued the elevated non-fasting blood glucose levels. Importantly, glomerular filtration rate was not affected by lithium, while urine albumin and immunoglobulin G content were further elevated. While lithium did not worsen the glomerulosclerosis, proximal tubule function seemed affected by lithium, as urinary NGAL levels were significantly increased. These results demonstrate that lithium attenuates non-fasting blood glucose levels in diabetic mice, but aggravates urinary albumin and immunoglobulin G content, possibly resulting from proximal tubule dysfunction.
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Affiliation(s)
- Theun de Groot
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Lars Damen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Leanne Kosse
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Mohammad Alsady
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Rosalinda Doty
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | | | - Susan Sheehan
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | - Johan van der Vlag
- Department of Nephrology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ron Korstanje
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | - Peter M. T. Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
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15
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Bongers CCWG, Alsady M, Nijenhuis T, Hartman YAW, Eijsvogels TMH, Deen PMT, Hopman MTE. Impact of acute versus repetitive moderate intensity endurance exercise on kidney injury markers. Physiol Rep 2017; 5:e13544. [PMID: 29263119 PMCID: PMC5742704 DOI: 10.14814/phy2.13544] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 11/19/2017] [Indexed: 11/30/2022] Open
Abstract
Exercise may lead to kidney injury through several mechanisms. Urinary Kidney Injury Molecule-1 (uKIM1) and Neutrophil Gelatinase-Associated Lipocalin (uNGAL) are known biomarkers for acute kidney injury, but their response to repetitive exercise remains unknown. We examined the effects of a single versus repetitive bouts of exercise on markers for kidney injury in a middle-aged population. Sixty subjects (aged 29-78 years, 50% male) were included and walked 30, 40 or 50 km for three consecutive days. At baseline and after exercise day 1 and 3, a urine sample was collected to determine uNGAL and uKIM1. Furthermore, urinary cystatin C, creatinine, and osmolality were used to correct for dehydration-related changes in urinary concentration. Baseline uNGAL was 9.2 (5.2-14.7) ng/mL and increased to 20.7 (11.0-37.2) ng/mL and 14.2(8.0-26.3) ng/mL after day 1 and day 3, respectively, (P ≤ 0.001). Baseline uKIM1 concentration was 2.6 (1.4-6.0) ng/mL and increased to 5.2 (2.4-9.1) ng/mL (P = 0.002) after day 1, whereas uKIM1 was not different from baseline at day 3 (2.9 [1.4-6.4] ng/mL (P = 0.52)). Furthermore, both uNGAL and uKIM1 levels were higher after day 1 compared to day 3 (P < 0.01). When corrected for urinary cystatin C, creatinine, and osmolality, uNGAL demonstrated a similar response compared to the uncorrected data, whereas differences in uKIM1 between baseline, day 1 and day 3 (Ptime = 0.63) were no longer observed for cystatin C and creatinine corrected data. A single bout of prolonged exercise significantly increased uNGAL concentration, whereas no changes in uKIM1 were found. Repetitive bouts of exercise show that there is no cumulative effect of kidney injury markers.
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Affiliation(s)
- Coen C. W. G. Bongers
- Department of PhysiologyRadboud Institute for Health SciencesRadboud university medical centerNijmegenThe Netherlands
| | - Mohammad Alsady
- Department of PhysiologyRadboud Institute for Molecular Life SciencesRadboud university medical centerNijmegenThe Netherlands
| | - Tom Nijenhuis
- Department of NephrologyRadboud Institute for Molecular Life SciencesRadboud university medical centerNijmegenThe Netherlands
| | - Yvonne A. W. Hartman
- Department of PhysiologyRadboud Institute for Health SciencesRadboud university medical centerNijmegenThe Netherlands
| | - Thijs M. H. Eijsvogels
- Department of PhysiologyRadboud Institute for Health SciencesRadboud university medical centerNijmegenThe Netherlands
- Research Institute for Sports and Exercise SciencesLiverpool John Moores UniversityLiverpoolUnited Kingdom
| | - Peter M. T. Deen
- Department of PhysiologyRadboud Institute for Molecular Life SciencesRadboud university medical centerNijmegenThe Netherlands
| | - Maria T. E. Hopman
- Department of PhysiologyRadboud Institute for Health SciencesRadboud university medical centerNijmegenThe Netherlands
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16
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Centrone M, Ranieri M, Di Mise A, Berlingerio SP, Russo A, Deen PMT, Staub O, Valenti G, Tamma G. AQP2 Abundance is Regulated by the E3-Ligase CHIP Via HSP70. Cell Physiol Biochem 2017; 44:515-531. [PMID: 29145196 DOI: 10.1159/000485088] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [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: 07/17/2017] [Accepted: 10/13/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS AQP2 expression is mainly controlled by vasopressin-dependent changes in protein abundance which is in turn regulated by AQP2 ubiquitylation and degradation, however the proteins involved in these processes are largely unknown. Here, we investigated the potential role of the CHIP E3 ligase in AQP2 regulation. METHODS MCD4 cells and kidney slices were used to study the involvement of the E3 ligase CHIP on AQP2 protein abundance by cell homogenization and immunoprecipitation followed by immunoblotting. RESULTS We found that AQP2 complexes with CHIP in renal tissue. Expression of CHIP increased proteasomal degradation of AQP2 and HSP70 abundance, a molecular signature of HSP90 inhibition. Increased HSP70 level, secondary to CHIP expression, promoted ERK signaling resulting in increased AQP2 phosphorylation at S261. Phosphorylation of AQP2 at S256 and T269 were instead downregulated. Next, we investigated HSP70 interaction with AQP2, which is important for endocytosis. Compared with AQP2-wt, HSP70 binding decreased in AQP2-S256D and AQP2-S256D-S261D, while increased in AQP2-S256D-S261A. Surprisingly, expression of CHIP-delUbox, displaying a loss of E3 ligase activity, still induced AQP2 degradation, indicating that CHIP does not ubiquitylate and degrade AQP2 itself. Conversely, the AQP2 half-life was increased upon the expression of CHIP-delTPR a domain which binds Hsc70/HSP70 and HSP90. HSP70 has been reported to bind other E3 ligases such as MDM2. Notably, we found that co-expression of CHIP and MDM2 increased AQP2 degradation, whereas co-expression of CHIP with MDM2-delRING, an inactive form of MDM2, impaired AQP2 degradation. CONCLUSION Our findings indicate CHIP as a master regulator of AQP2 degradation via HSP70 that has dual functions: (1) as chaperone for AQP2 and (2) as an anchoring protein for MDM2 E3 ligase, which is likely to be involved in AQP2 degradation.
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Affiliation(s)
- Mariangela Centrone
- Dept. Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Marianna Ranieri
- Dept. Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Annarita Di Mise
- Dept. Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | | | - Annamaria Russo
- Dept. Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Peter M T Deen
- Dept of Physiology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Olivier Staub
- Department of Pharmacology and Toxicology, University of Lausanne, Lausanne, Switzerland
| | - Giovanna Valenti
- Dept. Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy.,Istituto Nazionale di Biostrutture e Biosistemi (I.N.B.B.), Roma, Italy.,Centro di Eccellenza di Genomica in campo Biomedico ed Agrario (CEGBA), Bari, Italy
| | - Grazia Tamma
- Dept. Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy.,Istituto Nazionale di Biostrutture e Biosistemi (I.N.B.B.), Roma, Italy
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17
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Alsady M, de Groot T, Kortenoeven MLA, Carmone C, Neijman K, Bekkenkamp-Grovenstein M, Engelke U, Wevers R, Baumgarten R, Korstanje R, Deen PMT. Lithium induces aerobic glycolysis and glutaminolysis in collecting duct principal cells. Am J Physiol Renal Physiol 2017; 314:F230-F239. [PMID: 29070571 DOI: 10.1152/ajprenal.00297.2017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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: 01/10/2023] Open
Abstract
Lithium, given to bipolar disorder patients, causes nephrogenic diabetes insipidus (Li-NDI), a urinary-concentrating defect. Li-NDI occurs due to downregulation of principal cell AQP2 expression, which coincides with principal cell proliferation. The metabolic effect of lithium on principal cells, however, is unknown and investigated here. In earlier studies, we showed that the carbonic anhydrase (CA) inhibitor acetazolamide attenuated Li-induced downregulation in mouse-collecting duct (mpkCCD) cells. Of the eight CAs present in mpkCCD cells, siRNA and drug treatments showed that downregulation of CA9 and to some extent CA12 attenuated Li-induced AQP2 downregulation. Moreover, lithium induced cell proliferation and increased the secretion of lactate. Lithium also increased urinary lactate levels in wild-type mice that developed Li-NDI but not in lithium-treated mice lacking ENaC, the principal cell entry site for lithium. Inhibition of aerobic glycolysis with 2-deoxyglucose (2DG) attenuated lithium-induced AQP2 downregulation in mpkCCD cells but did not attenuate Li-NDI in mice. Interestingly, NMR analysis demonstrated that lithium also increased the urinary succinate, fumarate, citrate, and NH4+ levels, which were, in contrast to lactate, not decreased by 2DG. Together, our data reveal that lithium induces aerobic glycolysis and glutaminolysis in principal cells and that inhibition of aerobic glycolysis, but not the glutaminolysis, does not attenuate Li-NDI.
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Affiliation(s)
- Mohammad Alsady
- Department of Physiology, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Theun de Groot
- Department of Physiology, Radboud University Medical Center , Nijmegen , The Netherlands.,The Jackson Laboratory, Nathan Shock Center of Excellence in the Basic Biology of Aging, The Jackson Laboratory , Bar Harbor, Maine
| | | | - Claudia Carmone
- Department of Physiology, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Kim Neijman
- Department of Physiology, Radboud University Medical Center , Nijmegen , The Netherlands
| | | | - Udo Engelke
- Department of Laboratory Medicine, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Ron Wevers
- Department of Laboratory Medicine, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Ruben Baumgarten
- Society of Experimental Laboratory Medicine , Amersfoort , The Netherlands
| | - Ron Korstanje
- The Jackson Laboratory, Nathan Shock Center of Excellence in the Basic Biology of Aging, The Jackson Laboratory , Bar Harbor, Maine
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18
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Trimpert C, Wesche D, de Groot T, Pimentel Rodriguez MM, Wong V, van den Berg DTM, Cheval L, Ariza CA, Doucet A, Stagljar I, Deen PMT. NDFIP allows NEDD4/NEDD4L-induced AQP2 ubiquitination and degradation. PLoS One 2017; 12:e0183774. [PMID: 28931009 PMCID: PMC5606929 DOI: 10.1371/journal.pone.0183774] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 08/10/2017] [Indexed: 12/13/2022] Open
Abstract
Regulation of our water homeostasis is fine-tuned by dynamic translocation of Aquaporin-2 (AQP2)-bearing vesicles to and from the plasma membrane of renal principal cells. Whereas binding of vasopressin to its type-2 receptor initiates a cAMP-protein kinase A cascade and AQP2 translocation to the apical membrane, this is counteracted by protein kinase C-activating hormones, resulting in ubiquitination-dependent internalization of AQP2. The proteins targeting AQP2 for ubiquitin-mediated degradation are unknown. In collecting duct mpkCCD cells, siRNA knockdown of NEDD4 and NEDD4L E3 ligases yielded increased AQP2 abundance, but they did not bind AQP2. Membrane Yeast Two-Hybrid assays using full-length AQP2 as bait, identified NEDD4 family interacting protein 2 (NDFIP2) to bind AQP2. NDFIP2 and its homologue NDFIP1 have PY motifs by which they bind NEDD4 family members and bring them close to target proteins. In HEK293 cells, NDFIP1 and NDFIP2 bound AQP2 and were essential for NEDD4/NEDD4L-mediated ubiquitination and degradation of AQP2, an effect not observed with PY-lacking NDFIP1/2 proteins. In mpkCCD cells, downregulation of NDFIP1, NEDD4 and NEDD4L, but not NDFIP2, increased AQP2 abundance. In mouse kidney, Ndfip1 and Ndfip2 mRNA distribution was similar and high in proximal tubules and collecting ducts, which was also found for NDFIP1 proteins. Our results reveal that NEDD4/NEDD4L mediate ubiquitination and degradation of AQP2, but that NDFIP proteins are needed to connect NEDD4/NEDD4L to AQP2. As NDFIP1/2 bind many NEDD4 family E3 ligases, which are implicated in several cellular processes, NDFIP1/2 may be the missing link for AQP2 ubiquitination and degradation from different subcellular locations.
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Affiliation(s)
- Christiane Trimpert
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Daniel Wesche
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Theun de Groot
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Martha M. Pimentel Rodriguez
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
- Donnelly Centre for Cellular and Biomolecular Research, Departments of Biochemistry and Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Victoria Wong
- Donnelly Centre for Cellular and Biomolecular Research, Departments of Biochemistry and Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | | | - Lydie Cheval
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, Université Paris Descartes, Sorbonne Paris Cité, CNRS, Centre de Recherche des Cordeliers, Paris, France
| | - Carolina A. Ariza
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Alain Doucet
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, Université Paris Descartes, Sorbonne Paris Cité, CNRS, Centre de Recherche des Cordeliers, Paris, France
| | - Igor Stagljar
- Donnelly Centre for Cellular and Biomolecular Research, Departments of Biochemistry and Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Peter M. T. Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
- * E-mail:
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19
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de Groot T, Doornebal J, Christensen BM, Cockx S, Sinke AP, Baumgarten R, Bedford JJ, Walker RJ, Wetzels JFM, Deen PMT. Lithium-induced NDI: acetazolamide reduces polyuria but does not improve urine concentrating ability. Am J Physiol Renal Physiol 2017; 313:F669-F676. [DOI: 10.1152/ajprenal.00147.2017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 06/07/2017] [Accepted: 06/09/2017] [Indexed: 01/07/2023] Open
Abstract
Lithium is the mainstay treatment for patients with bipolar disorder, but it generally causes nephrogenic diabetes insipidus (NDI), a disorder in which the renal urine concentrating ability has become vasopressin insensitive. Li-NDI is caused by lithium uptake by collecting duct principal cells and downregulation of aquaporin-2 (AQP2) water channels, which are essential for water uptake from tubular urine. Recently, we found that the prophylactic administration of acetazolamide to mice effectively attenuated Li-NDI. To evaluate whether acetazolamide might benefit lithium-treated patients, we administered acetazolamide to mice with established Li-NDI and six patients with a lithium-induced urinary concentrating defect. In mice, acetazolamide partially reversed lithium-induced polyuria and increased urine osmolality, which, however, did not coincide with increased AQP2 abundances. In patients, acetazolamide led to the withdrawal of two patients from the study due to side effects. In the four remaining patients acetazolamide did not lead to clinically relevant changes in maximal urine osmolality. Urine output was also not affected, although none of these patients demonstrated overt lithium-induced polyuria. In three out of four patients, acetazolamide treatment increased serum creatinine levels, indicating a decreased glomerular filtration rate (GFR). Strikingly, these three patients also showed a decrease in systemic blood pressure. All together, our data reveal that acetazolamide does not improve the urinary concentrating defect caused by lithium, but it lowers the GFR, likely explaining the reduced urine output in our mice and in a recently reported patient with lithium-induced polyuria. The reduced GFR in patients prone to chronic kidney disease development, however, warrants against application of acetazolamide in Li-NDI patients without long-term (pre)clinical studies.
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Affiliation(s)
- Theun de Groot
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Joan Doornebal
- Department of Nephrology, Radboud University Medical Center, Nijmegen, The Netherlands
- Department of Nephrology, Isala Clinics, Zwolle, The Netherlands
| | | | - Simone Cockx
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
- Department of Medicine, University of Otago, Dunedin, New Zealand
| | - Anne P. Sinke
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | | | - Robert J. Walker
- Department of Medicine, University of Otago, Dunedin, New Zealand
| | - Jack F. M. Wetzels
- Department of Nephrology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Peter M. T. Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
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20
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Roche JV, Survery S, Kreida S, Nesverova V, Ampah-Korsah H, Gourdon M, Deen PMT, Törnroth-Horsefield S. Phosphorylation of human aquaporin 2 (AQP2) allosterically controls its interaction with the lysosomal trafficking protein LIP5. J Biol Chem 2017; 292:14636-14648. [PMID: 28710278 DOI: 10.1074/jbc.m117.788364] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 03/26/2017] [Revised: 07/07/2017] [Indexed: 12/21/2022] Open
Abstract
The interaction between the renal water channel aquaporin-2 (AQP2) and the lysosomal trafficking regulator-interacting protein LIP5 targets AQP2 to multivesicular bodies and facilitates lysosomal degradation. This interaction is part of a process that controls AQP2 apical membrane abundance in a vasopressin-dependent manner, allowing for urine volume adjustment. Vasopressin regulates phosphorylation at four sites within the AQP2 C terminus (Ser256, Ser261, Ser264, and Thr269), of which Ser256 is crucial and sufficient for AQP2 translocation from storage vesicles to the apical membrane. However, whether AQP2 phosphorylation modulates AQP2-LIP5 complex affinity is unknown. Here we used far-Western blot analysis and microscale thermophoresis to show that the AQP2 binds LIP5 in a phosphorylation-dependent manner. We constructed five phospho-mimicking mutants (S256E, S261E, S264E, T269E, and S256E/T269E) and a C-terminal truncation mutant (ΔP242) that lacked all phosphorylation sites but retained a previously suggested LIP5-binding site. CD spectroscopy indicated that wild-type AQP2 and the phospho-mimicking mutants had similar overall structure but displayed differences in melting temperatures possibly arising from C-terminal conformational changes. Non-phosphorylated AQP2 bound LIP5 with the highest affinity, whereas AQP2-ΔP242 had 20-fold lower affinity as determined by microscale thermophoresis. AQP2-S256E, S261E, T269E, and S256E/T269E all had reduced affinity. This effect was most prominent for AQP2-S256E, which fits well with its role in apical membrane targeting. AQP2-S264E had affinity similar to non-phosphorylated AQP2, possibly indicating a role in exosome excretion. Our data suggest that AQP2 phosphorylation allosterically controls its interaction with LIP5, illustrating how altered affinities to interacting proteins form the basis for regulation of AQP2 trafficking by post-translational modifications.
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Affiliation(s)
- Jennifer Virginia Roche
- From the Department of Biochemistry and Structural Biology, Lund University, 221 00 Lund, Sweden and
| | - Sabeen Survery
- From the Department of Biochemistry and Structural Biology, Lund University, 221 00 Lund, Sweden and
| | - Stefan Kreida
- From the Department of Biochemistry and Structural Biology, Lund University, 221 00 Lund, Sweden and
| | - Veronika Nesverova
- From the Department of Biochemistry and Structural Biology, Lund University, 221 00 Lund, Sweden and
| | - Henry Ampah-Korsah
- From the Department of Biochemistry and Structural Biology, Lund University, 221 00 Lund, Sweden and
| | - Maria Gourdon
- From the Department of Biochemistry and Structural Biology, Lund University, 221 00 Lund, Sweden and
| | - Peter M T Deen
- the Department of Physiology, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
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21
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van Diepen JA, Robben JH, Hooiveld GJ, Carmone C, Alsady M, Boutens L, Bekkenkamp-Grovenstein M, Hijmans A, Engelke UFH, Wevers RA, Netea MG, Tack CJ, Stienstra R, Deen PMT. SUCNR1-mediated chemotaxis of macrophages aggravates obesity-induced inflammation and diabetes. Diabetologia 2017; 60:1304-1313. [PMID: 28382382 PMCID: PMC5487589 DOI: 10.1007/s00125-017-4261-z] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 02/28/2017] [Indexed: 12/12/2022]
Abstract
AIMS/HYPOTHESIS Obesity induces macrophages to drive inflammation in adipose tissue, a crucial step towards the development of type 2 diabetes. The tricarboxylic acid (TCA) cycle intermediate succinate is released from cells under metabolic stress and has recently emerged as a metabolic signal induced by proinflammatory stimuli. We therefore investigated whether succinate receptor 1 (SUCNR1) could play a role in the development of adipose tissue inflammation and type 2 diabetes. METHODS Succinate levels were determined in human plasma samples from individuals with type 2 diabetes and non-diabetic participants. Succinate release from adipose tissue explants was studied. Sucnr1 -/- and wild-type (WT) littermate mice were fed a high-fat diet (HFD) or low-fat diet (LFD) for 16 weeks. Serum metabolic variables, adipose tissue inflammation, macrophage migration and glucose tolerance were determined. RESULTS We show that hypoxia and hyperglycaemia independently drive the release of succinate from mouse adipose tissue (17-fold and up to 18-fold, respectively) and that plasma levels of succinate were higher in participants with type 2 diabetes compared with non-diabetic individuals (+53%; p < 0.01). Sucnr1 -/- mice had significantly reduced numbers of macrophages (0.56 ± 0.07 vs 0.92 ± 0.15 F4/80 cells/adipocytes, p < 0.05) and crown-like structures (0.06 ± 0.02 vs 0.14 ± 0.02, CLS/adipocytes p < 0.01) in adipose tissue and significantly improved glucose tolerance (p < 0.001) compared with WT mice fed an HFD, despite similarly increased body weights. Consistently, macrophages from Sucnr1 -/- mice showed reduced chemotaxis towards medium collected from apoptotic and hypoxic adipocytes (-59%; p < 0.05). CONCLUSIONS/INTERPRETATION Our results reveal that activation of SUCNR1 in macrophages is important for both infiltration and inflammation of adipose tissue in obesity, and suggest that SUCNR1 is a promising therapeutic target in obesity-induced type 2 diabetes. DATA AVAILABILITY The dataset generated and analysed during the current study is available in GEO with the accession number GSE64104, www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE64104 .
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Affiliation(s)
- Janna A van Diepen
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Joris H Robben
- Department of Physiology, Radboud University Medical Center, PO Box 9101, 6500 HB, Nijmegen, the Netherlands
| | - Guido J Hooiveld
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
| | - Claudia Carmone
- Department of Physiology, Radboud University Medical Center, PO Box 9101, 6500 HB, Nijmegen, the Netherlands
| | - Mohammad Alsady
- Department of Physiology, Radboud University Medical Center, PO Box 9101, 6500 HB, Nijmegen, the Netherlands
| | - Lily Boutens
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
| | | | - Anneke Hijmans
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Udo F H Engelke
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Ron A Wevers
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Mihai G Netea
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Cees J Tack
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Rinke Stienstra
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
| | - Peter M T Deen
- Department of Physiology, Radboud University Medical Center, PO Box 9101, 6500 HB, Nijmegen, the Netherlands.
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22
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Abstract
Trace amounts of lithium are essential for our physical and mental health, and administration of lithium has improved the quality of life of millions of patients with bipolar disorder for >60 years. However, in a substantial number of patients with bipolar disorder, long-term lithium therapy comes at the cost of severe renal side effects, including nephrogenic diabetes insipidus and rarely, ESRD. Although the mechanisms underlying the lithium-induced renal pathologies are becoming clearer, several recent animal studies revealed that short-term administration of lower amounts of lithium prevents different forms of experimental AKI. In this review, we discuss the knowledge of the pathologic and therapeutic effects of lithium in the kidney. Furthermore, we discuss the underlying mechanisms of these seemingly paradoxical effects of lithium, in which fine-tuned regulation of glycogen synthase kinase type 3, a prime target for lithium, seems to be key. The new discoveries regarding the protective effect of lithium against AKI in rodents call for follow-up studies in humans and suggest that long-term therapy with low lithium concentrations could be beneficial in CKD.
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Affiliation(s)
- Mohammad Alsady
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands; and
| | | | - Peter M T Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands; and
| | - Theun de Groot
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands; and
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23
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de Groot T, Sinke AP, Kortenoeven MLA, Alsady M, Baumgarten R, Devuyst O, Loffing J, Wetzels JF, Deen PMT. Acetazolamide Attenuates Lithium-Induced Nephrogenic Diabetes Insipidus. J Am Soc Nephrol 2015; 27:2082-91. [PMID: 26574046 DOI: 10.1681/asn.2015070796] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/30/2015] [Indexed: 12/27/2022] Open
Abstract
To reduce lithium-induced nephrogenic diabetes insipidus (lithium-NDI), patients with bipolar disorder are treated with thiazide and amiloride, which are thought to induce antidiuresis by a compensatory increase in prourine uptake in proximal tubules. However, thiazides induced antidiuresis and alkalinized the urine in lithium-NDI mice lacking the sodium-chloride cotransporter, suggesting that inhibition of carbonic anhydrases (CAs) confers the beneficial thiazide effect. Therefore, we tested the effect of the CA-specific blocker acetazolamide in lithium-NDI. In collecting duct (mpkCCD) cells, acetazolamide reduced the cellular lithium content and attenuated lithium-induced downregulation of aquaporin-2 through a mechanism different from that of amiloride. Treatment of lithium-NDI mice with acetazolamide or thiazide/amiloride induced similar antidiuresis and increased urine osmolality and aquaporin-2 abundance. Thiazide/amiloride-treated mice showed hyponatremia, hyperkalemia, hypercalcemia, metabolic acidosis, and increased serum lithium concentrations, adverse effects previously observed in patients but not in acetazolamide-treated mice in this study. Furthermore, acetazolamide treatment reduced inulin clearance and cortical expression of sodium/hydrogen exchanger 3 and attenuated the increased expression of urinary PGE2 observed in lithium-NDI mice. These results show that the antidiuresis with acetazolamide was partially caused by a tubular-glomerular feedback response and reduced GFR. The tubular-glomerular feedback response and/or direct effect on collecting duct principal or intercalated cells may underlie the reduced urinary PGE2 levels with acetazolamide, thereby contributing to the attenuation of lithium-NDI. In conclusion, CA activity contributes to lithium-NDI development, and acetazolamide attenuates lithium-NDI development in mice similar to thiazide/amiloride but with fewer adverse effects.
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Affiliation(s)
| | | | | | | | | | - Olivier Devuyst
- Institute of Physiology, Zurich Centre for Integrative Human Physiology, Zurich, Switzerland; and
| | | | - Jack F Wetzels
- Nephrology, Radboud University Medical Center, Nijmegen, The Netherlands
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24
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Cheng SC, Quintin J, Cramer RA, Shepardson KM, Saeed S, Kumar V, Giamarellos-Bourboulis EJ, Martens JHA, Rao NA, Aghajanirefah A, Manjeri GR, Li Y, Ifrim DC, Arts RJW, van der Veer BMJW, van der Meer BMJW, Deen PMT, Logie C, O'Neill LA, Willems P, van de Veerdonk FL, van der Meer JWM, Ng A, Joosten LAB, Wijmenga C, Stunnenberg HG, Xavier RJ, Netea MG. mTOR- and HIF-1α-mediated aerobic glycolysis as metabolic basis for trained immunity. Science 2014; 345:1250684. [PMID: 25258083 DOI: 10.1126/science.1250684] [Citation(s) in RCA: 1329] [Impact Index Per Article: 132.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Epigenetic reprogramming of myeloid cells, also known as trained immunity, confers nonspecific protection from secondary infections. Using histone modification profiles of human monocytes trained with the Candida albicans cell wall constituent β-glucan, together with a genome-wide transcriptome, we identified the induced expression of genes involved in glucose metabolism. Trained monocytes display high glucose consumption, high lactate production, and a high ratio of nicotinamide adenine dinucleotide (NAD(+)) to its reduced form (NADH), reflecting a shift in metabolism with an increase in glycolysis dependent on the activation of mammalian target of rapamycin (mTOR) through a dectin-1-Akt-HIF-1α (hypoxia-inducible factor-1α) pathway. Inhibition of Akt, mTOR, or HIF-1α blocked monocyte induction of trained immunity, whereas the adenosine monophosphate-activated protein kinase activator metformin inhibited the innate immune response to fungal infection. Mice with a myeloid cell-specific defect in HIF-1α were unable to mount trained immunity against bacterial sepsis. Our results indicate that induction of aerobic glycolysis through an Akt-mTOR-HIF-1α pathway represents the metabolic basis of trained immunity.
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Affiliation(s)
- Shih-Chin Cheng
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Jessica Quintin
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Robert A Cramer
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Kelly M Shepardson
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Sadia Saeed
- Department of Molecular Biology, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Vinod Kumar
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | | | - Joost H A Martens
- Department of Molecular Biology, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Nagesha Appukudige Rao
- Department of Molecular Biology, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Ali Aghajanirefah
- Department of Molecular Biology, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Ganesh R Manjeri
- Department of Biochemistry, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Yang Li
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Daniela C Ifrim
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Rob J W Arts
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Brian M J W van der Veer
- Department of Molecular Biology, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Brian M J W van der Meer
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Peter M T Deen
- Department of Physiology, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Colin Logie
- Department of Molecular Biology, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Luke A O'Neill
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Peter Willems
- Department of Biochemistry, Faculties of Science and Medicine, Nijmegen Centre for Molecular Life Sciences, Radboud University, 6500 HB Nijmegen, Netherlands
| | - Frank L van de Veerdonk
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Jos W M van der Meer
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Aylwin Ng
- Center for Computational and Integrative Biology and Gastrointestinal Unit, Massachusetts General Hospital, Harvard School of Medicine, Boston, MA 02114, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Leo A B Joosten
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands
| | - Cisca Wijmenga
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Hendrik G Stunnenberg
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Ramnik J Xavier
- Center for Computational and Integrative Biology and Gastrointestinal Unit, Massachusetts General Hospital, Harvard School of Medicine, Boston, MA 02114, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Mihai G Netea
- Department of Internal Medicine, Radboud University Medical Center, 6525 GA Nijmegen, Netherlands.
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25
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Tamma G, Lasorsa D, Trimpert C, Ranieri M, Di Mise A, Mola MG, Mastrofrancesco L, Devuyst O, Svelto M, Deen PMT, Valenti G. A protein kinase A-independent pathway controlling aquaporin 2 trafficking as a possible cause for the syndrome of inappropriate antidiuresis associated with polycystic kidney disease 1 haploinsufficiency. J Am Soc Nephrol 2014; 25:2241-53. [PMID: 24700872 DOI: 10.1681/asn.2013111234] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Renal water reabsorption is controlled by arginine vasopressin (AVP), which binds to V2 receptors, resulting in protein kinase A (PKA) activation, phosphorylation of aquaporin 2 (AQP2) at serine 256, and translocation of AQP2 to the plasma membrane. However, AVP also causes dephosphorylation of AQP2 at S261. Recent studies showed that cyclin-dependent kinases (cdks) can phosphorylate AQP2 peptides at S261 in vitro. We investigated the possible role of cdks in the phosphorylation of AQP2 and identified a new PKA-independent pathway regulating AQP2 trafficking. In ex vivo kidney slices and MDCK-AQP2 cells, R-roscovitine, a specific inhibitor of cdks, increased pS256 levels and decreased pS261 levels. The changes in AQP2 phosphorylation status were paralleled by increases in cell surface expression of AQP2 and osmotic water permeability in the absence of forskolin stimulation. R-Roscovitine did not alter cAMP-dependent PKA activity but specifically reduced protein phosphatase 2A (PP2A) expression and activity in MDCK cells. Notably, we found reduced PP2A expression and activity and reduced pS261 levels in Pkd1(+/-) mice displaying a syndrome of inappropriate antidiuresis with high levels of pS256, despite unchanged AVP and cAMP. Similar to previous findings in Pkd1(+/-) mice, R-roscovitine treatment caused a significant decrease in intracellular calcium in MDCK cells. Our data indicate that reduced activity of PP2A, secondary to reduced intracellular Ca(2+) levels, promotes AQP2 trafficking independent of the AVP-PKA axis. This pathway may be relevant for explaining pathologic states characterized by inappropriate AVP secretion and positive water balance.
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Affiliation(s)
- Grazia Tamma
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy;
| | - Domenica Lasorsa
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Christiane Trimpert
- Department of Physiology, Radboud University Medical Centre, Nijmegen, The Netherlands; and
| | - Marianna Ranieri
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Annarita Di Mise
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Maria Grazia Mola
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Lisa Mastrofrancesco
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Olivier Devuyst
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Maria Svelto
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Peter M T Deen
- Department of Physiology, Radboud University Medical Centre, Nijmegen, The Netherlands; and
| | - Giovanna Valenti
- Department of Biosciences Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
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26
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de Groot T, Alsady M, Jaklofsky M, Otte-Höller I, Baumgarten R, Giles RH, Deen PMT. Lithium causes G2 arrest of renal principal cells. J Am Soc Nephrol 2014; 25:501-10. [PMID: 24408872 DOI: 10.1681/asn.2013090988] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [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
Vasopressin-regulated expression and insertion of aquaporin-2 channels in the luminal membrane of renal principal cells is essential for urine concentration. Lithium affects urine concentrating ability, and approximately 20% of patients treated with lithium develop nephrogenic diabetes insipidus (NDI), a disorder characterized by polyuria and polydipsia. Lithium-induced NDI is caused by aquaporin-2 downregulation and a reduced ratio of principal/intercalated cells, yet lithium induces principal cell proliferation. Here, we studied how lithium-induced principal cell proliferation can lead to a reduced ratio of principal/intercalated cells using two-dimensional and three-dimensional polarized cultures of mouse renal collecting duct cells and mice treated with clinically relevant lithium concentrations. DNA image cytometry and immunoblotting revealed that lithium initiated proliferation of mouse renal collecting duct cells but also increased the G2/S ratio, indicating G2/M phase arrest. In mice, treatment with lithium for 4, 7, 10, or 13 days led to features of NDI and an increase in the number of principal cells expressing PCNA in the papilla. Remarkably, 30%-40% of the PCNA-positive principal cells also expressed pHistone-H3, a late G2/M phase marker detected in approximately 20% of cells during undisturbed proliferation. Our data reveal that lithium treatment initiates proliferation of renal principal cells but that a significant percentage of these cells are arrested in the late G2 phase, which explains the reduced principal/intercalated cell ratio and may identify the molecular pathway underlying the development of lithium-induced renal fibrosis.
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Affiliation(s)
- Theun de Groot
- Department of Physiology, Nijmegen Centre for Molecular Life Sciences, and
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27
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Sinke AP, Kortenoeven MLA, de Groot T, Baumgarten R, Devuyst O, Wetzels JFM, Loffing J, Deen PMT. Hydrochlorothiazide attenuates lithium-induced nephrogenic diabetes insipidus independently of the sodium-chloride cotransporter. Am J Physiol Renal Physiol 2013; 306:F525-33. [PMID: 24352504 DOI: 10.1152/ajprenal.00617.2013] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Lithium is the most common cause of nephrogenic diabetes insipidus (Li-NDI). Hydrochlorothiazide (HCTZ) combined with amiloride is the mainstay treatment in Li-NDI. The paradoxical antidiuretic action of HCTZ in Li-NDI is generally attributed to increased sodium and water uptake in proximal tubules as a compensation for increased volume loss due to HCTZ inhibition of the Na-Cl cotransporter (NCC), but alternative actions for HCTZ have been suggested. Here, we investigated whether HCTZ exerted an NCC-independent effect in Li-NDI. In polarized mouse cortical collecting duct (mpkCCD) cells, HCTZ treatment attenuated the Li-induced downregulation of aquaporin-2 (AQP2) water channel abundance. In these cells, amiloride reduces cellular Li influx through the epithelial sodium channel (ENaC). HCTZ also reduced Li influx, but to a lower extent. HCTZ increased AQP2 abundance on top of that of amiloride and did not affect the ENaC-mediated transcellular voltage. MpkCCD cells did not express NCC mRNA or protein. These data indicated that in mpkCCD cells, HCTZ attenuated lithium-induced downregulation of AQP2 independently of NCC and ENaC. Treatment of Li-NDI NCC knockout mice with HCTZ revealed a significantly reduced urine volume, unchanged urine osmolality, and increased cortical AQP2 abundance compared with Li-treated NCC knockout mice. HCTZ treatment further resulted in reduced blood Li levels, creatinine clearance, and alkalinized urinary pH. Our in vitro and in vivo data indicate that part of the antidiuretic effect of HCTZ in Li-NDI is NCC independent and may involve a tubuloglomerular feedback response-mediated reduction in glomerular filtration rate due to proximal tubular carbonic anhydrase inhibition.
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Affiliation(s)
- Anne P Sinke
- 286 Dept. of Physiology, Radboud Institute for Molecular Life Sciences, Radboud Univ. Medical Center, Geert Grooteplein Zuid 26-28, 6525 GA, Nijmegen, The Netherlands.
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28
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Kortenoeven MLA, Sinke AP, Hadrup N, Trimpert C, Wetzels JFM, Fenton RA, Deen PMT. Demeclocycline attenuates hyponatremia by reducing aquaporin-2 expression in the renal inner medulla. Am J Physiol Renal Physiol 2013; 305:F1705-18. [PMID: 24154696 DOI: 10.1152/ajprenal.00723.2012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Binding of vasopressin to its type 2 receptor in renal collecting ducts induces cAMP signaling, transcription and translocation of aquaporin (AQP)2 water channels to the plasma membrane, and water reabsorption from the prourine. Demeclocycline is currently used to treat hyponatremia in patients with the syndrome of inappropriate antidiuretic hormone secretion (SIADH). Demeclocycline's mechanism of action, which is poorly understood, is studied here. In mouse cortical collecting duct (mpkCCD) cells, which exhibit deamino-8-D-arginine vasopressin (dDAVP)-dependent expression of endogenous AQP2, demeclocycline decreased AQP2 abundance and gene transcription but not its protein stability. Demeclocycline did not affect vasopressin type 2 receptor localization but decreased dDAVP-induced cAMP generation and the abundance of adenylate cyclase 3 and 5/6. The addition of exogenous cAMP partially corrected the demeclocycline effect. As in patients, demeclocycline increased urine volume, decreased urine osmolality, and reverted hyponatremia in an SIADH rat model. AQP2 and adenylate cyclase 5/6 abundances were reduced in the inner medulla but increased in the cortex and outer medulla, in the absence of any sign of toxicity. In conclusion, our in vitro and in vivo data indicate that demeclocycline mainly attenuates hyponatremia in SIADH by reducing adenylate cyclase 5/6 expression and, consequently, cAMP generation, AQP2 gene transcription, and AQP2 abundance in the renal inner medulla, coinciding with a reduced vasopressin escape response in other collecting duct segments.
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Affiliation(s)
- Marleen L A Kortenoeven
- no. 286, Dept. of Physiology, Radboud Univ. Medical Centre, PO Box 9101, Nijmegen 6500 HB, The Netherlands.
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29
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Mohamed M, Ashikov A, Guillard M, Robben JH, Schmidt S, van den Heuvel B, de Brouwer APM, Gerardy-Schahn R, Deen PMT, Wevers RA, Lefeber DJ, Morava E. Intellectual disability and bleeding diathesis due to deficient CMP--sialic acid transport. Neurology 2013; 81:681-7. [PMID: 23873973 DOI: 10.1212/wnl.0b013e3182a08f53] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To identify the underlying genetic defect in a patient with intellectual disability, seizures, ataxia, macrothrombocytopenia, renal and cardiac involvement, and abnormal protein glycosylation. METHODS Genetic studies involved homozygosity mapping by 250K single nucleotide polymorphism array and SLC35A1 sequencing. Functional studies included biochemical assays for N-glycosylation and mucin-type O-glycosylation and SLC35A1-encoded cytidine 5'-monophosphosialic acid (CMP-sialic acid) transport after heterologous expression in yeast. RESULTS We performed biochemical analysis and found combined N- and O-glycosylation abnormalities and specific reduction in sialylation in this patient. Homozygosity mapping revealed homozygosity for the CMP-sialic acid transporter SLC35A1. Mutation analysis identified a homozygous c.303G > C (p.Gln101His) missense mutation that was heterozygous in both parents. Functional analysis of mutant SLC35A1 showed normal Golgi localization but 50% reduction in transport activity of CMP-sialic acid in vitro. CONCLUSION We confirm an autosomal recessive, generalized sialylation defect due to mutations in SLC35A1. The primary neurologic presentation consisting of ataxia, intellectual disability, and seizures, in combination with bleeding diathesis and proteinuria, is discriminative from a previous case described with deficient sialic acid transporter. Our study underlines the importance of sialylation for normal CNS development and regular organ function.
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Affiliation(s)
- Miski Mohamed
- Department of Pediatrics, Medizinische Hochschule Hannover, Germany
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30
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Bogum J, Faust D, Zühlke K, Eichhorst J, Moutty MC, Furkert J, Eldahshan A, Neuenschwander M, von Kries JP, Wiesner B, Trimpert C, Deen PMT, Valenti G, Rosenthal W, Klussmann E. Small-molecule screening identifies modulators of aquaporin-2 trafficking. J Am Soc Nephrol 2013; 24:744-58. [PMID: 23559583 DOI: 10.1681/asn.2012030295] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In the principal cells of the renal collecting duct, arginine vasopressin (AVP) stimulates the synthesis of cAMP, leading to signaling events that culminate in the phosphorylation of aquaporin-2 water channels and their redistribution from intracellular domains to the plasma membrane via vesicular trafficking. The molecular mechanisms that control aquaporin-2 trafficking and the consequent water reabsorption, however, are not completely understood. Here, we used a cell-based assay and automated immunofluorescence microscopy to screen 17,700 small molecules for inhibitors of the cAMP-dependent redistribution of aquaporin-2. This approach identified 17 inhibitors, including 4-acetyldiphyllin, a selective blocker of vacuolar H(+)-ATPase that increases the pH of intracellular vesicles and causes accumulation of aquaporin-2 in the Golgi compartment. Although 4-acetyldiphyllin did not inhibit forskolin-induced increases in cAMP formation and downstream activation of protein kinase A (PKA), it did prevent cAMP/PKA-dependent phosphorylation at serine 256 of aquaporin-2, which triggers the redistribution to the plasma membrane. It did not, however, prevent cAMP-induced changes to the phosphorylation status at serines 261 or 269. Last, we identified the fungicide fluconazole as an inhibitor of cAMP-mediated redistribution of aquaporin-2, but its target in this pathway remains unknown. In conclusion, our screening approach provides a method to begin dissecting molecular mechanisms underlying AVP-mediated water reabsorption, evidenced by our identification of 4-acetyldiphyllin as a modulator of aquaporin-2 trafficking.
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Affiliation(s)
- Jana Bogum
- Max Delbrueck Center for Molecular Medicine, Robert-Rössle Strasse, 10 D-13125, Berlin, Germany
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31
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Itel F, Al-Samir S, Öberg F, Chami M, Kumar M, Supuran CT, Deen PMT, Meier W, Hedfalk K, Gros G, Endeward V. CO2 permeability of cell membranes is regulated by membrane cholesterol and protein gas channels. FASEB J 2012; 26:5182-91. [PMID: 22964306 DOI: 10.1096/fj.12-209916] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Recent observations that some membrane proteins act as gas channels seem surprising in view of the classical concept that membranes generally are highly permeable to gases. Here, we study the gas permeability of membranes for the case of CO(2), using a previously established mass spectrometric technique. We first show that biological membranes lacking protein gas channels but containing normal amounts of cholesterol (30-50 mol% of total lipid), e.g., MDCK and tsA201 cells, in fact possess an unexpectedly low CO(2) permeability (P(CO2)) of ∼0.01 cm/s, which is 2 orders of magnitude lower than the P(CO2) of pure planar phospholipid bilayers (∼1 cm/s). Phospholipid vesicles enriched with similar amounts of cholesterol also exhibit P(CO2) ≈ 0.01 cm/s, identifying cholesterol as the major determinant of membrane P(CO2). This is confirmed by the demonstration that MDCK cells depleted of or enriched with membrane cholesterol show dramatic increases or decreases in P(CO2), respectively. We demonstrate, furthermore, that reconstitution of human AQP-1 into cholesterol-containing vesicles, as well as expression of human AQP-1 in MDCK cells, leads to drastic increases in P(CO2), indicating that gas channels are of high functional significance for gas transfer across membranes of low intrinsic gas permeability.
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Affiliation(s)
- Fabian Itel
- Department of Chemistry, Universität Basel, Basel, Switzerland
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32
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Kortenoeven MLA, Trimpert C, van den Brand M, Li Y, Wetzels JFM, Deen PMT. In mpkCCD cells, long-term regulation of aquaporin-2 by vasopressin occurs independent of protein kinase A and CREB but may involve Epac. Am J Physiol Renal Physiol 2012; 302:F1395-401. [PMID: 22419689 DOI: 10.1152/ajprenal.00376.2011] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Urine concentration involves the hormone vasopressin (AVP), which stimulates cAMP production in renal principal cells, resulting in translocation and transcription of aquaporin-2 (AQP2) water channels, greatly increasing the water permeability, leading to a concentrated urine. As cAMP levels decrease shortly after AVP addition, whereas AQP2 levels still increase and are maintained for days, we investigated in the present study the mechanism responsible for the AQP2 increase after long-term 1-desamino-8-d-arginine vasopressin (dDAVP) application using mouse collecting duct (mpkCCD) cells. While 30 min of dDAVP incubation strongly increased cAMP, cAMP was lower with 1 day and was even further reduced with 4 days of dDAVP, although still significantly higher than in control cells. One day of dDAVP incubation increased AQP2 promoter-dependent transcription, which was blocked by the protein kinase A (PKA) inhibitor H89. Moreover, phosphorylation of the cAMP-responsive element binding protein (CREB) and CRE-dependent transcription was observed after short-term dDAVP stimulation. With 4 days of dDAVP, AQP2 transcription remained elevated, but this was not blocked by H89, and CRE-dependent transcription and CREB phosphorylation were not increased. Exchange factor directly activated by cAMP (Epac) 1 and 2 were found to be endogenously expressed in mpkCCD cells. Application of dDAVP increased the expression of Epac1, while Epac2 was reduced. Incubation with a specific Epac activator after dDAVP pretreatment increased both AQP2 abundance and transcription compared with cells left unstimulated the last day. In conclusion, the PKA-CRE pathway is involved in the initial rise in AQP2 levels after dDAVP stimulation but not in the long-term effect of dDAVP. Instead, long-term regulation of AQP2 may involve the activation of Epac.
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Affiliation(s)
- Marleen L A Kortenoeven
- Department of Physiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Abstract
The G protein-coupled succinate and α-ketoglutarate receptors are closely related to the family of P2Y purinoreceptors. Although the α-ketoglutarate receptor is almost exclusively expressed in the kidney, its function is unknown. In contrast, the succinate receptor, SUCRN1, is expressed in a variety of tissues, including blood cells, adipose tissue, liver, retina, and the kidney. Recent evidence suggests SUCRN1 and its succinate ligand are novel detectors of local stress, including ischemia, hypoxia, toxicity, and hyperglycemia. Local levels of succinate in the kidney also activate the renin-angiotensin system and together with SUCRN1 may play a key role in the development of hypertension and the complications of diabetes mellitus, metabolic disease, and liver damage. This makes the succinate receptor a promising drug target to counteract an expanding number of interrelated disorders.
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Affiliation(s)
- Peter M T Deen
- Department of Physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, The Netherlands
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34
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Kortenoeven MLA, Schweer H, Cox R, Wetzels JFM, Deen PMT. Lithium reduces aquaporin-2 transcription independent of prostaglandins. Am J Physiol Cell Physiol 2011; 302:C131-40. [PMID: 21881002 DOI: 10.1152/ajpcell.00197.2011] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Vasopressin (AVP)-stimulated translocation and transcription of aquaporin-2 (AQP2) water channels in renal principal cells is essential for urine concentration. Twenty percent of patients treated with lithium develop nephrogenic diabetes insipidus (NDI), a disorder in which the kidney is unable to concentrate urine. In vivo and in mouse collecting duct (mpkCCD) cells, lithium treatment coincides with decreased AQP2 abundance and inactivation of glycogen synthase kinase (Gsk) 3β. This is paralleled in vivo by an increased renal cyclooxygenase 2 (COX-2) expression and urinary prostaglandin PGE(2) excretion. PGE(2) reduces AVP-stimulated water reabsorption, but its precise role in lithium-induced downregulation of AQP2 is unclear. Using mpkCCD cells, we here investigated whether prostaglandins contribute to lithium-induced downregulation of AQP2. In these cells, lithium application reduced AQP2 abundance, which coincided with Gsk3β inactivation and increased COX-2 expression. Inhibition of COX by indomethacin, leading to reduced PGE(2) and PGF(2α) levels, or dexamethasone-induced downregulation of COX-2 both increased AQP2 abundance, while PGE(2) addition reduced AQP2 abundance. However, lithium did not change the prostaglandin levels, and indomethacin and dexamethasone did not prevent lithium-induced AQP2 downregulation. Further analysis revealed that lithium decreased AQP2 protein abundance, mRNA levels and transcription, while PGE(2) reduced AQP2 abundance by increasing its lysosomal degradation, but not by reducing AQP2 gene transcription. In conclusion, our data reveal that in mpkCCD cells, prostaglandins decrease AQP2 protein stability by increasing its lysosomal degradation, indicating that in vivo paracrine-produced prostaglandins might have a role in lithium-induced NDI via this mechanism. However, lithium affects also AQP2 gene transcription, which is prostaglandin independent.
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Abstract
Maintenance of the osmobalance is important for life. In this process, in which brain and kidney act in concert, mammals have to cope with significant deviations as drinking water reduces plasma osmolality, whereas salty food increases it. To restore homeostasis, specialized nuclei within the hypothalamus play a pivotal role in detecting changes in plasma osmolality and initiating appropriate responses. These responses are accomplished by either changing the intake of water or the excretion of water by the kidney. In the past decade, several novel findings have made significant contributions to our insights in the process of systemic osmoregulation. Novel proteins have been identified in the brain as well as in the kidney that are fulfilling important roles in the process of systemic osmoregulation. In this review, recent evidence of the involvement of TRPV channels (TRPV1, TRPV2, and TRPV4) and proteins, such as sodium channels NALCN and Na(x), in neuronal osmoregulation, as well as; e.g., the purinergic P2Y2 receptor in renal osmoregulation, are discussed, and integrated with existing knowledge of systemic osmoregulation.
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Affiliation(s)
- Anne P Sinke
- Department of Physiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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36
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Nejsum LN, Christensen TM, Robben JH, Milligan G, Deen PMT, Bichet DG, Levin K. Novel mutation in the AVPR2 gene in a Danish male with nephrogenic diabetes insipidus caused by ER retention and subsequent lysosomal degradation of the mutant receptor. NDT Plus 2011; 4:158-163. [PMID: 21629670 PMCID: PMC3103721 DOI: 10.1093/ndtplus/sfr010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Accepted: 01/24/2011] [Indexed: 12/28/2022] Open
Abstract
Mutations in the arginine vasopressin receptor 2 (AVPR2) gene can cause X-linked nephrogenic diabetes insipidus (NDI) characterized by the production of large amounts of urine and an inability to concentrate urine in response to the antidiuretic hormone vasopressin. We have identified a novel mutation in the AVPR2 gene (L170P) located in the fourth transmembrane domain in a Danish NDI male. Analysis of the mutant receptor in Madin-Darby Canine Kidney cell culture revealed that AVPR2-L170P was retained in the endoplasmic reticulum, and the expression was dramatically downregulated compared to wild-type AVPR2. Inhibition of the lysosome resulted in increased intracellular accumulation of AVPR2-L170P, indicating that AVPR2-L170P is downregulated via the lysosome. Inhibition of the proteasome resulted in plasma membrane localization of AVPR2-L170P, although the overall levels of AVPR2-L170P were unchanged.
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Affiliation(s)
- Lene N. Nejsum
- Department of Biology, Stanford University, Stanford, CA, USA
- Present address: Department of Molecular Biology, Aarhus University, C. F. Moellers Allé 3, Aarhus, Denmark
| | | | - Joris H. Robben
- Department of Physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University, Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Graeme Milligan
- Molecular Pharmacology Group, Institute of Neuroscience and Psychology College of Medical, Veterinary and Life Sciences University of Glasgow, Glasgow, UK
| | - Peter M. T. Deen
- Department of Physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University, Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Daniel G. Bichet
- Department of Medicine and Physiology, Université de Montreal, Montreal, Canada
| | - Klaus Levin
- Department of Endocrinology, Bispebjerg Hospital, Copenhagen, Denmark
- Department of Endocrinology, Odense University Hospital, Svendborg, Denmark
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Kortenoeven MLA, van den Brand M, Wetzels JFM, Deen PMT. Hypotonicity-induced reduction of aquaporin-2 transcription in mpkCCD cells is independent of the tonicity responsive element, vasopressin, and cAMP. J Biol Chem 2011; 286:13002-10. [PMID: 21324903 DOI: 10.1074/jbc.m110.207878] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The syndrome of inappropriate antidiuretic hormone secretion is characterized by excessive water uptake and hyponatremia. The extent of hyponatremia, however, is less than anticipated, which is ascribed to a defense mechanism, the vasopressin-escape, and is suggested to involve a tonicity-determined down-regulation of the water channel aquaporin-2 (AQP2). The underlying mechanism, however, is poorly understood. To study this, we used the mouse cortical collecting duct (mpkCCD) cell line. MpkCCD cells, transfected with an AQP2-promoter luciferase construct showed a reduced and increased AQP2 abundance and transcription following culture in hypotonic and hypertonic medium, respectively. This depended on tonicity rather than osmolality and occurred independently of the vasopressin analog dDAVP, cAMP levels, or protein kinase A activity. Although prostaglandins and nitric oxide reduced AQP2 abundance, inhibition of their synthesis did not influence tonicity-induced AQP2 transcription. Also, cells in which the cAMP or tonicity-responsive element (CRE/TonE) in the AQP2-promoter were mutated showed a similar response to hypotonicity. Instead, the tonicity-responsive elements were pin-pointed to nucleotides -283 to -252 and -157 to -126 bp. In conclusion, our data indicate that hypotonicity reduces AQP2 abundance and transcription, which occurs independently of vasopressin, cAMP, and the known TonE and CRE in the AQP2-promoter. Increased prostaglandin and nitric oxide, as found in vivo, may contribute to reduced AQP2 in vasopressin-escape, but do not mediate the effect of hypotonicity on AQP2 transcription. Our data suggest that two novel segments (-283 to -252 and -157 to -126 bp) in the AQP2-promoter mediate the hypotonicity-induced AQP2 down-regulation during vasopressin-escape.
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Affiliation(s)
- Marleen L A Kortenoeven
- Department of Physiology, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands
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Boone M, Kortenoeven MLA, Robben JH, Tamma G, Deen PMT. Counteracting vasopressin-mediated water reabsorption by ATP, dopamine, and phorbol esters: mechanisms of action. Am J Physiol Renal Physiol 2011; 300:F761-71. [PMID: 21209006 DOI: 10.1152/ajprenal.00247.2010] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Water homeostasis is regulated by a wide variety of hormones. When in need for water conservation, vasopressin, released from the brain, binds renal principal cells and initiates a signaling cascade resulting in the insertion of aquaporin-2 (AQP2) water channels in the apical membrane and water reabsorption. Conversely, hormones, including extracellular purines and dopamine, antagonize AVP-induced water permeability, but their mechanism of action is largely unknown, which was investigated here. Addition of these hormones to mpkCCD cells decreased total and plasma membrane abundance of AVP-induced AQP2, partly by increasing its internalization to vesicles and lysosomal degradation. This internalization was ubiquitin dependent, because the hormones increased AQP2 ubiquitination, and the plasma membrane localization of AQP2-K270R, which cannot be monoubiquitinated, was unaffected by these hormones. Both hormones also increased AQP2 phosphorylation at S261, which followed ubiquitination, but was not essential for hormone-induced AQP2 degradation. A similar process occurs in vivo, as incubation of dDAVP-treated kidney slices with both hormones also resulted in the internalization and S261 phosphorylation of AQP2. Both hormones also reduced cAMP and AQP2 mRNA levels, suggesting an additional effect on AQP2 gene transcription. Interestingly, phorbol esters only reduced AQP2 through the first pathway. Together, our results indicate that ATP and dopamine counteract AVP-induced water permeability by increasing AQP2 degradation in lysosomes, preceded by ubiquitin-dependent internalization, and by decreasing AQP2 gene transcription by reducing the AVP-induced cAMP levels.
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Affiliation(s)
- Michelle Boone
- Department of General and Environmental Physiology, University of Bari, Bari, Italy
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39
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Morava E, Kühnisch J, Drijvers JM, Robben JH, Cremers C, van Setten P, Branten A, Stumpp S, de Jong A, Voesenek K, Vermeer S, Heister A, Claahsen-van der Grinten HL, O'Neill CW, Willemsen MA, Lefeber D, Deen PMT, Kornak U, Kremer H, Wevers RA. Autosomal recessive mental retardation, deafness, ankylosis, and mild hypophosphatemia associated with a novel ANKH mutation in a consanguineous family. J Clin Endocrinol Metab 2011; 96:E189-98. [PMID: 20943778 PMCID: PMC5393418 DOI: 10.1210/jc.2010-1539] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Mutations in ANKH cause the highly divergent conditions familial chondrocalcinosis and craniometaphyseal dysplasia. The gene product ANK is supposed to regulate tissue mineralization by transporting pyrophosphate to the extracellular space. OBJECTIVE We evaluated several family members of a large consanguineous family with mental retardation, deafness, and ankylosis. We compared their skeletal, metabolic, and serological parameters to that of the autosomal recessive progressive ankylosis (ank) mouse mutant, caused by a loss-of-function mutation in the murine ortholog Ank. PARTICIPANTS The studied patients had painful small joint soft-tissue calcifications, progressive spondylarthropathy, osteopenia, mild hypophosphatemia, mixed hearing loss, and mental retardation. RESULTS After mapping the disease gene to 5p15, we identified the novel homozygous ANK missense mutation L244S in all patients. Although L244 is a highly conserved amino acid, the mutated ANK protein was detected at normal levels at the plasma membrane in primary patient fibroblasts. The phenotype was highly congruent with the autosomal recessive progressive ankylosis (ank) mouse mutant. This indicates a loss-of-function effect of the L244S mutation despite normal ANK protein expression. Interestingly, our analyses revealed that the primary step of joint degeneration is fibrosis and mineralization of articular soft tissues. Moreover, heterozygous carriers of the L244S mutation showed mild osteoarthritis without metabolic alterations, pathological calcifications, or central nervous system involvement. CONCLUSION Beyond the description of the first human progressive ankylosis phenotype, our results indicate that ANK influences articular soft tissues commonly involved in degenerative joint disorders. Furthermore, this human disorder provides the first direct evidence for a role of ANK in the central nervous system.
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Affiliation(s)
- Eva Morava
- Radboud University Nijmegen, Department of Pediatrics, Nijmegen, The Netherlands.
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40
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Sinke AP, Caputo C, Tsaih SW, Yuan R, Ren D, Deen PMT, Korstanje R. Genetic analysis of mouse strains with variable serum sodium concentrations identifies the Nalcn sodium channel as a novel player in osmoregulation. Physiol Genomics 2010; 43:265-70. [PMID: 21177381 DOI: 10.1152/physiolgenomics.00188.2010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In central osmoregulation, a 1-2% rise in plasma osmolality is detected by specialized osmoreceptors located in the circumventricular organs of the hypothalamus. A disturbance in this tightly regulated balance will result in either hyponatremia or hypernatremia, which are both common electrolyte disorders in hospitalized patients. Despite the high clinical importance of hypo- and hypernatremia and the fact that this vital process has been studied for many years, the genes and corresponding proteins involved in this process are just beginning to be identified. To identify novel genes involved in the (patho-)physiology of osmoregulation, we therefore employed haplotype association mapping on an aging group of 27 inbred mouse strains. Serum sodium concentrations were determined in all strains at 6, 12, and 18 mo of age, and high-resolution mapping was performed for males and females separately. We identified a total of five loci associated with the serum sodium concentration of which the locus on chromosome 14, containing only one known gene (Nalcn), showed the strongest correlation. Within this locus three different haplotypes could be distinguished, which associated with different average serum sodium levels. The association of Nalcn with sodium levels was confirmed by analysis of heterozygous Nalcn knockout mice, which displayed hypernatremia compared with wild-type littermates. Our study demonstrates that Nalcn associates with serum sodium concentrations in mice and indicates that Nalcn is an important novel player in osmoregulation.
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Affiliation(s)
- Anne P Sinke
- Department of Physiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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41
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Tamma G, Robben JH, Trimpert C, Boone M, Deen PMT. Regulation of AQP2 localization by S256 and S261 phosphorylation and ubiquitination. Am J Physiol Cell Physiol 2010; 300:C636-46. [PMID: 21148409 DOI: 10.1152/ajpcell.00433.2009] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Vasopressin-induced water reabsorption coincides with phosphorylation of aquaporin-2 (AQP2) at S256 (pS256), dephosphorylation at S261, and its translocation to the apical membrane, whereas treatment with the phorbol ester 12-tetradecanoylphorbol-13-acetate (TPA) induces AQP2 ubiquitination at K270, its internalization, and lysosomal degradation. In this study we investigated the relationship between S256 and S261 phosphorylation in AQP2 and its ubiquitination and trafficking in MDCK cells. Forskolin stimulation associated with increased pS256 and decreased pS261 AQP2, indicating that MDCK cells are a good model. After forskolin stimulation, TPA-induced ubiquitination of AQP2 preceded phosphorylation of AQP2 at S261, which in the first instance occurred predominantly on ubiquitinated AQP2. Forskolin-induced changes in pS261 were also observed for AQP2-S256A and AQP2-S256D, which constitutively localize in vesicles and the apical membrane, respectively. Although pS261 varies with forskolin as with wild-type AQP2, AQP2-S256A is not increased in its ubiquitination. Our data reveal that pS261 occurred independently of AQP2 localization and suggest that pS261 follows ubiquitination and endocytosis and may stabilize AQP2 ubiquitination and intracellular localization. The absence of increased ubiquitination of AQP2-S256A indicates that its intracellular location is due to the lack of pS256. Furthermore, AQP2-S261A and AQP2-S261D localized to vesicles, which was due to their increased ubiquitination, because changing K270 into Arg in both mutants resulted in their localization in the apical membrane. Although still increased in its ubiquitination, AQP2-S256D-S261D localized in the apical membrane. AQP2-S256D-K270R-Ub, however, localized to intracellular vesicles. Although our localization of AQP2-S261A/D is different from that of others, these data indicate that constitutive S256 phosphorylation counterbalances S261D-induced ubiquitination and internalization or changes its structure to allow distribution to the apical membrane. The vesicular localization of AQP2-S256D-K270R-Ub, however, indicates that the dominant apical sorting of S256D can again be overruled by constitutive ubiquitination. These data indicate that the membrane localization of AQP2 is determined by the balance of the extents of phosphorylation and ubiquitination.
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Affiliation(s)
- Grazia Tamma
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
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Christensen BM, Zuber AM, Loffing J, Stehle JC, Deen PMT, Rossier BC, Hummler E. alphaENaC-mediated lithium absorption promotes nephrogenic diabetes insipidus. J Am Soc Nephrol 2010; 22:253-61. [PMID: 21051735 DOI: 10.1681/asn.2010070734] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [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
Lithium-induced nephrogenic diabetes insipidus (NDI) is accompanied by polyuria, downregulation of aquaporin 2 (AQP2), and cellular remodeling of the collecting duct (CD). The amiloride-sensitive epithelial sodium channel (ENaC) is a likely candidate for lithium entry. Here, we subjected transgenic mice lacking αENaC specifically in the CD (knockout [KO] mice) and littermate controls to chronic lithium treatment. In contrast to control mice, KO mice did not markedly increase their water intake. Furthermore, KO mice did not demonstrate the polyuria and reduction in urine osmolality induced by lithium treatment in the control mice. Lithium treatment reduced AQP2 protein levels in the cortex/outer medulla and inner medulla (IM) of control mice but only partially reduced AQP2 levels in the IM of KO mice. Furthermore, lithium induced expression of H(+)-ATPase in the IM of control mice but not KO mice. In conclusion, the absence of functional ENaC in the CD protects mice from lithium-induced NDI. These data support the hypothesis that ENaC-mediated lithium entry into the CD principal cells contributes to the pathogenesis of lithium-induced NDI.
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Affiliation(s)
- Birgitte Mønster Christensen
- Water and Salt Research Center, Department of Anatomy, Aarhus University, Wilhelm Meyers Allé 3, 8000 Aarhus C, Denmark.
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43
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Nossent AY, Robben JH, Deen PMT, Vos HL, Rosendaal FR, Doggen CJM, Hansen JL, Sheikh SP, Bertina RM, Eikenboom JCJ. Functional variation in the arginine vasopressin 2 receptor as a modifier of human plasma von Willebrand factor levels. J Thromb Haemost 2010; 8:1547-54. [PMID: 20403097 DOI: 10.1111/j.1538-7836.2010.03884.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
SUMMARY OBJECTIVES Stimulation of arginine vasopressin 2 receptor (V2R) with arginine vasopressin (AVP) results in a rise in von Willebrand factor (VWF) and factor VIII plasma levels. We hypothesized that gain-of-function variations in the V2R gene (AVPR2) would lead to higher plasma levels of VWF and FVIII. METHODS AND RESULTS We genotyped the control populations of two population-based studies for four AVPR2 variations: a-245c, G12E, L309L, and S331S. Rare alleles of a-245c, G12E, and S331S, which were in linkage disequilibrium, were associated with higher VWF propeptide, VWF and FVIII levels. The functionality of the G12E variant was studied in stably transfected MDCKII cells, expressing constructs of either 12G-V2R or 12E-V2R. Both V2R variants were fully glycosylated and expressed on the basolateral membrane. The binding affinity of V2R for AVP was increased three-fold in 12E-V2R-green fluorescent protein (GFP) cells, which is in accordance with increased levels of VWF propeptide associated with the 12E variant. The dissociation constant (K(D)) was 4.5 nm [95% confidence interval (CI) 3.6-5.4] for 12E-V2R-GFP and 16.5 nm (95% CI 10.1-22.9) for 12G-V2R-GFP. AVP-induced cAMP generation was enhanced in 12E-V2R-GFP cells. CONCLUSIONS The 12E-V2R variant has increased binding affinity for AVP, resulting in increased signal transduction, and is associated with increased levels of VWF propeptide, VWF, and FVIII.
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Affiliation(s)
- A Y Nossent
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Thrombosis and Hemostasis, Leiden University Medical Center, RC Leiden, the Netherlands
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Los EL, Deen PMT, Robben JH. Potential of nonpeptide (ant)agonists to rescue vasopressin V2 receptor mutants for the treatment of X-linked nephrogenic diabetes insipidus. J Neuroendocrinol 2010; 22:393-9. [PMID: 20163515 DOI: 10.1111/j.1365-2826.2010.01983.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
According to the body's need, water is reabsorbed from the pro-urine that is formed by ultrafiltration in the kidney. This process is regulated by the antidiuretic hormone arginine-vasopressin (AVP), which binds to its type 2 receptor (V2R) in the kidney. Mutations in the gene encoding the V2R often lead to the X-linked inheritable form of nephrogenic diabetes insipidus (NDI), a disorder in which patients are unable to concentrate their urine despite the presence of AVP. Many of these mutations are missense mutations that do not interfere with the intrinsic functionality of V2R, but cause its retention in the endoplasmic reticulum (ER), making it unavailable for AVP binding. Because the current treatments for NDI relieve its symptoms to some extent, but do not cure the disorder, cell-permeable antagonists (pharmacological chaperones) have been successfully used to stabilise the mutant receptors and restore their plasma membrane localisation. Recently, cell-permeable agonists also were shown to rescue ER-retained V2R mutants, leading to increased cAMP levels and translocation of aquaporin-2 to the apical membrane. This makes V2R-specific cell-permeable agonists very promising therapeutics for NDI as a result of misfolded V2R receptors.
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Affiliation(s)
- E L Los
- Department of physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Ko B, Kamsteeg EJ, Cooke LL, Moddes LN, Deen PMT, Hoover RS. RasGRP1 stimulation enhances ubiquitination and endocytosis of the sodium-chloride cotransporter. Am J Physiol Renal Physiol 2010; 299:F300-9. [PMID: 20392800 DOI: 10.1152/ajprenal.00441.2009] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The sodium-chloride cotransporter (NCC) is the principal salt-absorptive pathway in the distal convoluted tubule. Recently, we described a novel pathway of NCC regulation in which phorbol esters (PE) stimulate Ras guanyl-releasing protein 1 (RasGRP1), triggering a cascade ultimately activating ERK1/2 MAPK and decreasing NCC cell surface expression (Ko B, Joshi LM, Cooke LL, Vazquez N, Musch MW, Hebert SC, Gamba G, Hoover RS. Proc Natl Acad Sci USA 104: 20120-20125, 2007). Little is known about the mechanisms which underlie these effects on NCC activity. Regulation of NCC via changes in NCC surface expression has been reported, but endocytosis of NCC has not been demonstrated. In this study, utilizing biotinylation, internalization assays, and a dynamin dominant-negative construct, we demonstrate that the regulation of NCC by PE occurs via an enhancement in internalization of NCC and is dynamin dependent. In addition, immunoprecipitation of NCC and subsequent immunoblotting for ubiquitin showed increased ubiquitination of NCC with phorbol ester treatment. MEK1/2 inhibitors and gene silencing of RasGRP1 indicated that this effect was dependent on RasGRP1 and ERK1/2 activation. Inhibition of ubiquitination prevents any PE-mediated decrease in NCC surface expression as measured by biotinylation or NCC activity as measured by radiotracer uptake. These findings confirmed that the PE effect on NCC is mediated by endocytosis of NCC. Furthermore, ubiquitination of NCC is essential for this process and this ubiquitination is dependent upon RasGRP1-mediated ERK1/2 activation.
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Affiliation(s)
- Benjamin Ko
- Department of Medicine, University of Chicago, Illinois, USA
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46
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Boone M, Mobasheri A, Fenton RA, van Balkom BWM, Wismans R, van der Zee CEEM, Deen PMT. The lysosomal trafficking regulator interacting protein-5 localizes mainly in epithelial cells. J Mol Histol 2010; 41:61-74. [DOI: 10.1007/s10735-010-9263-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2010] [Accepted: 03/15/2010] [Indexed: 11/30/2022]
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47
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Fröhlich M, Deen PMT, Klipp E. A systems biology approach: modelling of Aquaporin-2 trafficking. Genome Inform 2010; 24:42-55. [PMID: 22081588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In healthy individuals, dehydration of the body leads to release of the hormone vasopressin from the pituitary. Via the bloodstream, vasopressin reaches the collecting duct cells in the kidney, where the water channel Aquaporin-2 (AQP2) is expressed. After stimulation of the vasopressin V2 receptor by vasopressin, intracellular AQP2-containing vesicles fuse with the apical plasma membrane of the collecting duct cells. This leads to increased water reabsorption from the pro-urine into the blood and therefore to enhanced retention of water within the body. Using existing biological data we propose a mathematical model of AQP-2 trafficking and regulation in collecting duct cells. Our model includes the vasopressin receptor, adenylate cyclase, protein kinase A, and intracellular as well as membrane located AQP2. To model the chemical reactions we used ordinary differential equations (ODEs) based on mass action kinetics. We employ known protein concentrations and time series data to estimate the kinetic parameters of our model and demonstrate its validity. Through generating, testing and ranking different versions of the model, we show that some model versions can describe the data well as soon as important regulatory parts such as the reduction of the signal by internalization of the vasopressin-receptor or the negative feedback loop representing phosphodiesterase activity are included. We perform time-dependent sensitivity analysis to identify the reactions that have the greatest influence on the cAMP and membrane located AQP2 levels over time. We predict the time courses for membrane located AQP2 at different vasopressin concentrations, compare them with newly generated data and discuss the competencies of the model.
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Olivier JDA, Cools AR, Deen PMT, Olivier B, Ellenbroek BA. Blockade of dopamine, but not noradrenaline, transporters produces hyperthermia in rats that lack serotonin transporters. Eur J Pharmacol 2009; 629:7-11. [PMID: 20004658 DOI: 10.1016/j.ejphar.2009.11.049] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2008] [Revised: 11/13/2009] [Accepted: 11/23/2009] [Indexed: 11/24/2022]
Abstract
To investigate whether life-long disturbed serotonin neurotransmission may result in adaptive changes of dopaminergic and noradrenergic systems, effects of drugs on stress-induced hyperthermia were studied in serotonin transporter knockout rats. The noradrenalin transporter blocker atomoxetine was more effective in reducing stress-induced hyperthermia, induced by an injection, in serotonin transporter (SERT) knockout (SERT(-/-)) rats compared to SERT(+/+) rats. The dopamine transporter blocker GBR12909 increased the core body temperature in SERT(-/-) rats, and had no effect on the SERT(+/+) rats. Finally, the noradrenalin transporter together with dopamine transporter blocker bupropion was more effective in decreasing the stress of an injection in SERT(-/-) rats than in SERT(+/+) rats. These data suggest that the sensitivity of dopamine and noradrenalin receptors is changed in serotonin transporter knockout rats. The lack of the serotonin transporter in SERT(-/-) rats might reflect humans with a life-long disturbed serotonin system, making this rat a good model to study possible changes in dopaminergic and noradrenergic systems in psychiatric disorders.
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Affiliation(s)
- Jocelien D A Olivier
- Donders Institute for Brain, Cognition and Behaviour: Department of Cognitive Neuroscience: Molecular Neurobiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Savelkoul PJM, De Mattia F, Li Y, Kamsteeg EJ, Konings IBM, van der Sluijs P, Deen PMT. p.R254Q mutation in the aquaporin-2 water channel causing dominant nephrogenic diabetes insipidus is due to a lack of arginine vasopressin-induced phosphorylation. Hum Mutat 2009; 30:E891-903. [PMID: 19585583 DOI: 10.1002/humu.21082] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Vasopressin regulates human water homeostasis by re-distributing homotetrameric aquaporin-2 (AQP2) water channels from intracellular vesicles to the apical membrane of renal principal cells, a process in which phosphorylation of AQP2 at S256 by cAMP-dependent protein kinase A (PKA) is thought to be essential. Dominant nephrogenic diabetes insipidus (NDI), a disease in which the kidney is unable to concentrate urine in response to vasopressin, is caused by AQP2 gene mutations. Here, we investigated a reported patient case of dominant NDI caused by a novel p.R254Q mutation. Expressed in oocytes, AQP2-p.R254Q appeared to be a functional water channel, but was impaired in its transport to the cell surface to the same degree as AQP2-p.S256A, which mimics non-phosphorylated AQP2. In polarized MDCK cells, AQP2-p.R254Q was retained and was distributed similarly to that of unstimulated wt-AQP2 or AQP2-p.S256A. Upon co-expression, AQP2-p.R254Q interacted with, and retained wt-AQP2 in intracellular vesicles. In contrast to wild-type AQP2, forskolin did not increase AQP2-p.R254Q phosphorylation at S256 or its translocation to the apical membrane. Mimicking constitutive phosphorylation in AQP2-p.R254Q with the p.S256D mutation, however, rescued its apical membrane expression. These date indicate that a lack of S256 phosphorylation is the sole cause of dominant NDI here, and thereby, p.R254Q is a loss of function instead of a gain of function mutation in dominant NDI.
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Affiliation(s)
- Paul J M Savelkoul
- Dept of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
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50
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Boone M, Kortenoeven M, Robben JH, Deen PMT. Effect of the cGMP pathway on AQP2 expression and translocation: potential implications for nephrogenic diabetes insipidus. Nephrol Dial Transplant 2009; 25:48-54. [PMID: 19666909 DOI: 10.1093/ndt/gfp409] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Arginine vasopressin (AVP) binding to the V2 receptor (V2R) in renal collecting duct principal cells induces a cAMP signalling cascade resulting in the activation of protein kinase A (PKA), translocation of aquaporin-2 (AQP2) to the apical membrane and an increase in AQP2 expression. Consequently, concentration of urine is initiated. X-linked nephrogenic diabetes insipidus (NDI), characterized by the inability to concentrate urine in response to AVP, is caused by mutations in the V2R gene. Initiation of AQP2 translocation, while circumventing the V2R-cAMP-PKA pathway has been suggested as a putative therapy for these patients. In this respect, the activation of a cAMP-independent and cGMP-dependent pathway for AQP2 membrane insertion by different cyclic guanosine monophosphate (cGMP) pathway activators, such as atrial natriuretic peptide (ANP), l-arginine and 8-bromoguanosine 3',5'-cyclic monophosphate (8-Br-cGMP), has been put forward. However, it is unclear whether they can increase AQP2 expression. METHODS Mouse cortical collecting duct (mpkCCD) cells were incubated with ANP, l-arginine and 8-Br-cGMP for 2 h and subjected to immunocytochemistry and cell surface biotinylation assays to examine their effect on AQP2 translocation. To test the effect of cGMP pathway activators on AQP2 expression, the mpkCCD cells were treated with dDAVP, ANP and l-arginine for 4 days, or with 8-Br-cGMP for the last day. AQP2 protein levels were determined by immunoblotting. RESULTS ANP, l-arginine and 8-Br-cGMP induced the translocation of AQP2 in the mpkCCD cells. However, in contrast to dDAVP, ANP, l-arginine and 8-Br-cGMP did not increase the expression of AQP2. CONCLUSIONS Our results suggest that while activators of the cGMP pathway are likely beneficial in the treatment of X-linked NDI, their ability to relieve NDI in the patients may be improved when combined with agents stimulating AQP2 expression.
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Affiliation(s)
- Michelle Boone
- Department of Physiology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.
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