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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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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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3
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Ameling S, Bhardwaj G, Hammer E, Beug D, Steil L, Reinke Y, Weitmann K, Grube M, Trimpert C, Klingel K, Kandolf R, Hoffmann W, Nauck M, Dörr M, Empen K, Felix SB, Völker U. Erratum to: Changes of myocardial gene expression and protein composition in patients with dilated cardiomyopathy after immunoadsorption with subsequent immunoglobulin substitution. Basic Res Cardiol 2017; 112:40. [PMID: 28730386 PMCID: PMC7609265 DOI: 10.1007/s00395-017-0627-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sabine Ameling
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Gourav Bhardwaj
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Elke Hammer
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Daniel Beug
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany
| | - Leif Steil
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany
| | - Yvonne Reinke
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Kerstin Weitmann
- Institute for Community Medicine, University Medicine Greifswald, Ellernholzstr. 1-2, 17487, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Markus Grube
- Department of Pharmacology, Center of Drug Absorption and Transport (C_DAT), University Medicine Greifswald, Felix-Hausdorff-Str. 3, 17487, Greifswald, Germany
| | - Christiane Trimpert
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany
| | - Karin Klingel
- Department of Molecular Pathology, University Hospital Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Germany
| | - Reinhard Kandolf
- Department of Molecular Pathology, University Hospital Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Germany
| | - Wolfgang Hoffmann
- Institute for Community Medicine, University Medicine Greifswald, Ellernholzstr. 1-2, 17487, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Matthias Nauck
- Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Marcus Dörr
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Klaus Empen
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany
| | - Stephan B Felix
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany. .,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany.
| | - Uwe Völker
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany. .,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany.
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4
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Ameling S, Bhardwaj G, Hammer E, Beug D, Steil L, Reinke Y, Weitmann K, Grube M, Trimpert C, Klingel K, Kandolf R, Hoffmann W, Nauck M, Dörr M, Empen K, Felix SB, Völker U. Changes of myocardial gene expression and protein composition in patients with dilated cardiomyopathy after immunoadsorption with subsequent immunoglobulin substitution. Basic Res Cardiol 2016; 111:53. [PMID: 27412778 PMCID: PMC7101709 DOI: 10.1007/s00395-016-0569-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 06/16/2016] [Indexed: 12/18/2022]
Abstract
Immunoadsorption with subsequent immunoglobulin substitution (IA/IgG) represents a therapeutic approach for patients with dilated cardiomyopathy (DCM). Here, we studied which molecular cardiac alterations are initiated after this treatment. Transcription profiling of endomyocardial biopsies with Affymetrix whole genome arrays was performed on 33 paired samples of DCM patients collected before and 6 months after IA/IgG. Therapy-related effects on myocardial protein levels were analysed by label-free proteome profiling for a subset of 23 DCM patients. Data were analysed regarding therapy-associated differences in gene expression and protein levels by comparing responders (defined by improvement of left ventricular ejection fraction ≥20 % relative and ≥5 % absolute) and non-responders. Responders to IA/IgG showed a decrease in serum N-terminal proBNP levels in comparison with baseline which was accompanied by a decreased expression of heart failure markers, such as angiotensin converting enzyme 2 or periostin. However, despite clinical improvement even in responders, IA/IgG did not trigger general inversion of DCM-associated molecular alterations in myocardial tissue. Transcriptome profiling revealed reduced gene expression for connective tissue growth factor, fibronectin, and collagen type I in responders. In contrast, in non-responders after IA/IgG, fibrosis-associated genes and proteins showed elevated levels, whereas values were reduced or maintained in responders. Thus, improvement of LV function after IA/IgG seems to be related to a reduced gene expression of heart failure markers and pro-fibrotic molecules as well as reduced fibrosis progression.
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Affiliation(s)
- Sabine Ameling
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Gourav Bhardwaj
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Elke Hammer
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Daniel Beug
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany
| | - Leif Steil
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany
| | - Yvonne Reinke
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Kerstin Weitmann
- Institute for Community Medicine, University Medicine Greifswald, Ellernholzstr. 1-2, 17487, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Markus Grube
- Department of Pharmacology, Centre of Drug Absorption and Transport (C_DAT), University Medicine Greifswald, Felix-Hausdorff-Str. 3, 17487, Greifswald, Germany
| | - Christiane Trimpert
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany
| | - Karin Klingel
- Department of Molecular Pathology, University Hospital Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Germany
| | - Reinhard Kandolf
- Department of Molecular Pathology, University Hospital Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Germany
| | - Wolfgang Hoffmann
- Institute for Community Medicine, University Medicine Greifswald, Ellernholzstr. 1-2, 17487, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Matthias Nauck
- Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Marcus Dörr
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Klaus Empen
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany
| | - Stephan B Felix
- Department of Internal Medicine B, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475, Greifswald, Germany. .,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany.
| | - Uwe Völker
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Friedrich-Ludwig-Jahn-Straße 15a, 17475, Greifswald, Germany. .,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany.
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5
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Spillmann F, Trimpert C, Peng J, Eckerle LG, Staudt A, Warstat K, Felix SB, Pieske B, Tschöpe C, Van Linthout S. High-density lipoproteins reduce palmitate-induced cardiomyocyte apoptosis in an AMPK-dependent manner. Biochem Biophys Res Commun 2015; 466:272-7. [PMID: 26362182 DOI: 10.1016/j.bbrc.2015.09.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 08/27/2015] [Accepted: 09/05/2015] [Indexed: 12/18/2022]
Abstract
Palmitate has been implicated in the induction of cardiomyocyte apoptosis via reducing the activity of 5' AMP-activated protein kinase (AMPK). We sought to evaluate whether high-density lipoproteins (HDLs), known for their cardioprotective features and their potential to increase AMPK activity, can reduce palmitate-induced cardiomyocyte apoptosis and whether this effect is AMPK-dependent. Therefore, cardiomyocytes were isolated from adult Wistar rat hearts via perfusion on a Langendorff-apparatus and cultured in free fatty acid-free BSA control medium or 0.5 mM palmitate medium in the presence or absence of HDL (5 μg protein/ml) with or without 0.1 μM of the AMPK-inhibitor compound S for the analysis of Annexin V/propidium, genes involved in apoptosis and fatty acid oxidation, and cardiomyocyte contractility. We found that HDLs decreased palmitate-induced cardiomyocyte apoptosis as indicated by a reduction in Annexin V-positive cardiomyocytes and an increase in Bcl-2 versus Bax ratio. Concomitantly, HDLs increased the palmitate-impaired expression of genes involved in fatty acid oxidation. Furthermore, HDLs improved the palmitate-impaired cardiomyocyte contractility. All effects were mediated in an AMPK-dependent manner, concluding that HDLs reduce palmitate-induced cardiomyocyte apoptosis, resulting in improved cardiomyocyte contractility through a mechanism involving AMPK.
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Affiliation(s)
- Frank Spillmann
- Charité-University-Medicine Berlin, Campus Virchow Klinikum, Department of Cardiology, Berlin, Germany
| | - Christiane Trimpert
- Department of Internal Medicine I, University Medicine Greifswald, Greifswald, Germany
| | - Jun Peng
- Charité-University-Medicine Berlin, Campus Virchow Klinikum, Department of Cardiology, Berlin, Germany
| | - Lars G Eckerle
- Department of Internal Medicine I, University Medicine Greifswald, Greifswald, Germany
| | - Alexander Staudt
- Department of Internal Medicine I, University Medicine Greifswald, Greifswald, Germany
| | - Katrin Warstat
- Berlin-Brandenburg Center for Regenerative Therapies, Charité, University Medicine Berlin, Campus Virchow, Berlin, Germany
| | - Stephan B Felix
- Department of Internal Medicine I, University Medicine Greifswald, Greifswald, Germany; Deutsches Zentrum für Herz Kreislaufforschung (DZHK), Standort Greifswald, Germany
| | - Burkert Pieske
- Charité-University-Medicine Berlin, Campus Virchow Klinikum, Department of Cardiology, Berlin, Germany; Deutsches Zentrum für Herz Kreislaufforschung (DZHK), Standort Berlin/Charité, Germany
| | - Carsten Tschöpe
- Charité-University-Medicine Berlin, Campus Virchow Klinikum, Department of Cardiology, Berlin, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Charité, University Medicine Berlin, Campus Virchow, Berlin, Germany; Deutsches Zentrum für Herz Kreislaufforschung (DZHK), Standort Berlin/Charité, Germany
| | - Sophie Van Linthout
- Charité-University-Medicine Berlin, Campus Virchow Klinikum, Department of Cardiology, Berlin, Germany; Berlin-Brandenburg Center for Regenerative Therapies, Charité, University Medicine Berlin, Campus Virchow, Berlin, Germany; Deutsches Zentrum für Herz Kreislaufforschung (DZHK), Standort Berlin/Charité, Germany.
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6
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Pearce D, Soundararajan R, Trimpert C, Kashlan OB, Deen PM, Kohan DE. Collecting duct principal cell transport processes and their regulation. Clin J Am Soc Nephrol 2015; 10:135-46. [PMID: 24875192 PMCID: PMC4284417 DOI: 10.2215/cjn.05760513] [Citation(s) in RCA: 192] [Impact Index Per Article: 21.3] [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: 02/03/2023]
Abstract
The principal cell of the kidney collecting duct is one of the most highly regulated epithelial cell types in vertebrates. The effects of hormonal, autocrine, and paracrine factors to regulate principal cell transport processes are central to the maintenance of fluid and electrolyte balance in the face of wide variations in food and water intake. In marked contrast with the epithelial cells lining the proximal tubule, the collecting duct is electrically tight, and ion and osmotic gradients can be very high. The central role of principal cells in salt and water transport is reflected by their defining transporters-the epithelial Na(+) channel (ENaC), the renal outer medullary K(+) channel, and the aquaporin 2 (AQP2) water channel. The coordinated regulation of ENaC by aldosterone, and AQP2 by arginine vasopressin (AVP) in principal cells is essential for the control of plasma Na(+) and K(+) concentrations, extracellular fluid volume, and BP. In addition to these essential hormones, additional neuronal, physical, and chemical factors influence Na(+), K(+), and water homeostasis. Notably, a variety of secreted paracrine and autocrine agents such as bradykinin, ATP, endothelin, nitric oxide, and prostaglandin E2 counterbalance and limit the natriferic effects of aldosterone and the water-retaining effects of AVP. Considerable recent progress has improved our understanding of the transporters, receptors, second messengers, and signaling events that mediate principal cell responses to changing environments in health and disease. This review primarily addresses the structure and function of the key transporters and the complex interplay of regulatory factors that modulate principal cell ion and water transport.
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Affiliation(s)
- David Pearce
- Division of Nephrology, Department of Medicine, University of California, San Francisco, California
| | - Rama Soundararajan
- Department of Translational Molecular Pathology, MD Anderson Cancer Center, Houston, Texas
| | - Christiane Trimpert
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ossama B. Kashlan
- Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Peter M.T. Deen
- Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Donald E. Kohan
- Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah
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7
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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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9
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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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10
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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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11
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Ameling S, Herda LR, Hammer E, Steil L, Teumer A, Trimpert C, Dörr M, Kroemer HK, Klingel K, Kandolf R, Völker U, Felix SB. Myocardial gene expression profiles and cardiodepressant autoantibodies predict response of patients with dilated cardiomyopathy to immunoadsorption therapy. Eur Heart J 2012; 34:666-75. [PMID: 23100283 PMCID: PMC3584995 DOI: 10.1093/eurheartj/ehs330] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Aims Immunoadsorption with subsequent immunoglobulin G substitution (IA/IgG) represents a novel therapeutic approach in the treatment of dilated cardiomyopathy (DCM) which leads to the improvement of left ventricular ejection fraction (LVEF). However, response to this therapeutic intervention shows wide inter-individual variability. In this pilot study, we tested the value of clinical, biochemical, and molecular parameters for the prediction of the response of patients with DCM to IA/IgG. Methods and results Forty DCM patients underwent endomyocardial biopsies (EMBs) before IA/IgG. In eight patients with normal LVEF (controls), EMBs were obtained for clinical reasons. Clinical parameters, negative inotropic activity (NIA) of antibodies on isolated rat cardiomyocytes, and gene expression profiles of EMBs were analysed. Dilated cardiomyopathy patients displaying improvement of LVEF (≥20 relative and ≥5% absolute) 6 months after IA/IgG were considered responders. Compared with non-responders (n = 16), responders (n = 24) displayed shorter disease duration (P = 0.006), smaller LV internal diameter in diastole (P = 0.019), and stronger NIA of antibodies. Antibodies obtained from controls were devoid of NIA. Myocardial gene expression patterns were different in responders and non-responders for genes of oxidative phosphorylation, mitochondrial dysfunction, hypertrophy, and ubiquitin–proteasome pathway. The integration of scores of NIA and expression levels of four genes allowed robust discrimination of responders from non-responders at baseline (BL) [sensitivity of 100% (95% CI 85.8–100%); specificity up to 100% (95% CI 79.4–100%); cut-off value: −0.28] and was superior to scores derived from antibodies, gene expression, or clinical parameters only. Conclusion Combined assessment of NIA of antibodies and gene expression patterns of DCM patients at BL predicts response to IA/IgG therapy and may enable appropriate selection of patients who benefit from this therapeutic intervention.
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Affiliation(s)
- Sabine Ameling
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Universitätsmedizin Greifswald, Friedrich-Ludwig-Jahn-Strasse 15a, Greifswald D - 17487, Germany
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12
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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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13
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Trimpert C, Klussmann E, Deen PM. Vasopressin‐induced phosphorylation at S261 in AQP2‐P262L may explain nephrogenic diabetes insipidus. FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.1039.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Christiane Trimpert
- Department of PhysiologyRadboud University Nijmegen Medical CentreNijmegenNetherlands
| | - Enno Klussmann
- Leibnitz Institute for Molecular PharmacologyBerlinGermany
| | - Peter M.T. Deen
- Department of PhysiologyRadboud University Nijmegen Medical CentreNijmegenNetherlands
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14
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Hammer E, Goritzka M, Ameling S, Darm K, Steil L, Klingel K, Trimpert C, Herda LR, Dörr M, Kroemer HK, Kandolf R, Staudt A, Felix SB, Völker U. Characterization of the Human Myocardial Proteome in Inflammatory Dilated Cardiomyopathy by Label-free Quantitative Shotgun Proteomics of Heart Biopsies. J Proteome Res 2011; 10:2161-71. [DOI: 10.1021/pr1008042] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Elke Hammer
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst-Moritz-Arndt-Universität Greifswald, Germany
| | - Michelle Goritzka
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst-Moritz-Arndt-Universität Greifswald, Germany
| | - Sabine Ameling
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst-Moritz-Arndt-Universität Greifswald, Germany
| | - Katrin Darm
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst-Moritz-Arndt-Universität Greifswald, Germany
| | - Leif Steil
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst-Moritz-Arndt-Universität Greifswald, Germany
| | - Karin Klingel
- Abteilung Molekulare Pathologie, Universitätsklinikum Tübingen, Germany
| | | | - Lars R. Herda
- Klinik für Innere Medizin B, Universitätsmedizin Greifswald, Germany
| | - Marcus Dörr
- Klinik für Innere Medizin B, Universitätsmedizin Greifswald, Germany
| | - Heyo K. Kroemer
- Institut für Pharmakologie, Universitätsmedizin Greifswald, Germany
| | - Reinhard Kandolf
- Abteilung Molekulare Pathologie, Universitätsklinikum Tübingen, Germany
| | - Alexander Staudt
- Klinik für Innere Medizin B, Universitätsmedizin Greifswald, Germany
| | - Stephan B. Felix
- Klinik für Innere Medizin B, Universitätsmedizin Greifswald, Germany
| | - Uwe Völker
- Interfakultäres Institut für Genetik und Funktionelle Genomforschung, Ernst-Moritz-Arndt-Universität Greifswald, Germany
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15
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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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Trimpert C, Herda LR, Eckerle LG, Pohle S, Müller C, Landsberger M, Felix SB, Staudt A. Immunoadsorption in dilated cardiomyopathy: long-term reduction of cardiodepressant antibodies. Eur J Clin Invest 2010; 40:685-91. [PMID: 20546018 DOI: 10.1111/j.1365-2362.2010.02314.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Disturbances of humoral immunity have been described in dilated cardiomyopathy (DCM), and a number of antibodies against cardiac cell proteins have been identified. Previous studies showed that immunoadsorption therapy with subsequent IgG substitution (IA/IgG) enhances cardiac function, and that removal of cardiodepressant antibodies may represent one essential mechanism of this therapy. The long-term effect of IA/IgG on the level of cardiodepressant antibodies remains to be elucidated. METHODS A total of 17 patients with DCM were observed up to 12 months after IA/IgG. Echocardiographic measurements were performed at baseline, 3, 6 and 12 months after therapy. Cardiodepressant antibodies were detected by incubation of rat cardiomyocytes with purified patients' IgG and recording of contractility and Ca(2+) ratio. RESULTS In contrast to patients without cardiodepressant antibodies before IA/IgG, patients with negative inotropic antibodies showed an improvement of left ventricular ejection fraction (LVEF) from 33.8 +/- 1.7% to 44.7 +/- 2.7%; 44.5 +/- 2.3% and 51.8 +/- 1.7% after 3, 6 and 12 months (P < 0.001 vs. baseline, P < 0.05 vs. LVEF of non-cardiodepressant group). Immediately after IA/IgG therapy, no cardiodepressant effects of patients' IgG on isolated cardiomyocytes were detectable, and this effect remained diminished until 6 months after IA/IgG (P < 0.001 for contractility and Ca(2+) ratio). Compared with the levels after 3 and 6 months, cardiodepressant antibodies reoccured after 12 months (P = 0.067 for contractility, P < 0.05 for Ca(2+) ratio vs. 6 months after IA/IgG). However, the negative inotropic reaction is still diminished compared with the reaction before IA/IgG. CONCLUSION IA/IgG therapy induces long-term reduction of negative inotropic antibodies. After 12 months, however, re-increase of negative inotropic antibodies cannot be excluded.
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Affiliation(s)
- Christiane Trimpert
- University Hospital Greifswald, Department of Internal Medicine B, Greifswald, Germany
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17
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Voigt A, Trimpert C, Bartel K, Egerer K, Kuckelkorn U, Feist E, Gericke C, Klingel K, Kandolf R, Felix SB, Baumann G, Kloetzel PM, Stangl K, Staudt A. Lack of evidence for a pathogenic role of proteasome-directed autoimmunity in dilated cardiomyopathy. Basic Res Cardiol 2010; 105:557-67. [DOI: 10.1007/s00395-010-0096-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Revised: 03/12/2010] [Accepted: 03/13/2010] [Indexed: 01/10/2023]
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Voigt A, Bartel K, Egerer K, Trimpert C, Feist E, Gericke C, Kandolf R, Klingel K, Kuckelkorn U, Stangl K, Felix SB, Baumann G, Kloetzel PM, Staudt A. Humoral anti-proteasomal autoimmunity in dilated cardiomyopathy. Basic Res Cardiol 2009; 105:9-18. [DOI: 10.1007/s00395-009-0061-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 08/31/2009] [Accepted: 09/02/2009] [Indexed: 11/28/2022]
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Birkenmeier K, Janke I, Schunck WH, Trimpert C, Krieg T, Landsberger M, Völker U, Felix SB, Staudt A. Prostaglandin receptors mediate effects of substances released from ischaemic rat hearts on non-ischaemic cardiomyocytes. Eur J Clin Invest 2008; 38:902-9. [PMID: 19021714 DOI: 10.1111/j.1365-2362.2008.02052.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
BACKGROUND After ischaemia and during reperfusion, rat hearts release cardiodepressive substances that are putatively cyclooxygenase-2-dependent. The present study analyses the mechanisms by which these substances mediate their effect downstream of cyclooxygenase-2. MATERIALS AND METHODS After 10 min of global stop-flow ischaemia, isolated rat hearts were reperfused and post-ischaemic coronary effluent was collected over a period of 30 s. Non-ischaemic effluent collected before ischaemia was used as a control. We investigated the effect of the effluents on cell shortening and Ca(++)-metabolism, by application of fluorescence microscopy of field-stimulated adult rat cardiomyocytes incubated with fura-2. Cells were pre-incubated with inhibitors of protein kinase A and C and with antagonists of protein kinase A-dependent prostaglandin receptors. We examined the expression of prostaglandin receptors in cardiomyocytes by Western blotting. RESULTS In contrast to non-ischaemic effluent, post-ischaemic effluent induced reduction of Ca(++) transient and cell shortening in the cardiomyocytes. In contrast to protein kinase C inhibitor Myr-PKC [19-27], the protein kinase A inhibitor Rp-cAMPS completely blocked the effect of post-ischaemic effluent. Furthermore, we determined a cyclic adenosine monophosphate increase in cardiomyocytes that were pre-incubated with post-ischaemic effluent. The antagonist of prostaglandin E-receptor EP2 AH6809 and the antagonist of receptor subtype EP4 AH23848 attenuated the effect of post-ischaemic effluent in contrast to other antagonists of prostaglandin D and I receptors, which did not influence the effect. In lysates of adherend cardiomyocytes, expression of prostaglandin D, E and I receptors was detected by Western blotting. CONCLUSIONS The effect of post-ischaemic effluent is mediated by the protein kinase A-dependent prostaglandin-receptor subtypes EP2 and EP4 downstream of cyclooxygenase-2.
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Affiliation(s)
- K Birkenmeier
- Klinik für Innere Medizin B, Ernst-Moritz-Amdt-Universität Greifswald, Greifswald, Germany
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20
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Landsberger M, Staudt A, Choudhury S, Trimpert C, Herda LR, Klingel K, Kandolf R, Schultheiss HP, Kroemer HK, Völker U, Felix SB. Potential role of antibodies against cardiac Kv channel-interacting protein 2 in dilated cardiomyopathy. Am Heart J 2008; 156:92-99.e2. [PMID: 18585502 DOI: 10.1016/j.ahj.2008.02.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2007] [Accepted: 02/29/2008] [Indexed: 01/22/2023]
Abstract
BACKGROUND Growing evidence suggests participation of autoimmune mechanisms in the pathogenesis of dilated cardiomyopathy (DCM). METHODS Patients with heart failure (left ventricular ejection fraction < or =50%) due to DCM (n = 98) or ischemic cardiomyopathy (ICM, n = 49) and controls with normal left ventricular function (n = 98) were included. Immunoglobulin G antibodies were purified from plasma by affinity chromatography and analyzed by surface plasmon resonance analysis. We analyzed the distribution of autoantibodies against Kv channel-interacting protein (KChIP) 2.6, cardiac troponin I (cTnI), and the beta1-adrenergic receptor (second extracellular loop, cardiac beta1-adrenergic receptor [SEL-beta1-AR])-two other known autoantibodies involved in heart failure. Effects of antibodies against KChIP2 on cell death of isolated rat cardiomyocytes were assessed by flow cytometry. RESULTS We detected autoantibodies against KChIP2.6 in 14.3% (P < .015 vs controls, P = .286 vs ICM) of the DCM samples, in 8.2% of the ICM samples (P = .304 vs controls), and in 4.1% of the control samples. Virus persistence was significantly associated with detection of autoantibodies against KChIP2.6 in DCM patients (P = .025). Antibodies against SEL-beta1-AR were more frequent in DCM samples (34.7%, P < .001 vs controls, P = .02 vs ICM) and ICM samples (16.3%, P = .083 vs control) than in control samples (7.1%). Antibodies against cTnI were more frequent in DCM samples (20.4%, P < .001 vs controls, P = .769 vs ICM) and in ICM samples (18.4%, P < .01 vs controls) than in control samples (4.1%). Antibodies against rat KChIP2 enhanced cell death in isolated rat cardiomyocytes. Immunofluorescence indicated cell surface expression of KChIP2. CONCLUSIONS Autoantibodies against KChIP2.6, SEL-beta1-AR, and cTnI appear to be associated with DCM. Antibodies against KChIP2 may enhance cell death of rat cardiomyocytes.
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Lorenz M, Hellige N, Rieder P, Kinkel HT, Trimpert C, Staudt A, Felix SB, Baumann G, Stangl K, Stangl V. Positive inotropic effects of epigallocatechin-3-gallate (EGCG) involve activation of Na+/H+ and Na+/Ca2+ exchangers. Eur J Heart Fail 2008; 10:439-45. [PMID: 18406205 DOI: 10.1016/j.ejheart.2008.03.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [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] [Received: 09/04/2007] [Revised: 01/23/2008] [Accepted: 03/06/2008] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND There is evidence that the tea catechin epigallocatechin-3-gallate (EGCG) modulates myocardial contractility. However, the underlying mechanisms remain to be determined. AIMS To study potential signalling pathways involved in EGCG-induced contractile parameters. METHODS AND RESULTS EGCG increased fractional shortening in rat cardiac myocytes and enhanced intracellular systolic Ca2+ concentrations. In isolated rat hearts, perfusion with EGCG resulted in significant, dose-dependent increase in peak systolic left ventricular pressure, as well as in contraction and relaxation velocities. Heart rate did not change. Inhibition of the beta1-receptor with metoprolol had no influence on the contractile effects of EGCG. Furthermore, levels of cAMP and phosphorylation of phospholamban did not change with EGCG, indicating that the beta-receptor pathway is not involved. The L-type Ca2+ channel inhibitors, nifedipine and gallopamil, failed to modulate EGCG-induced increase in contractility. However, the myocardial effects and intracellular calcium transients stimulated by EGCG were significantly reduced by the antagonist of the Na+/H+ exchanger (NHE) methyl-N-isobutyl amiloride (MIA), and by blocking of the reverse mode of the Na+/Ca2+ exchanger (NCX) by KB-R7943. CONCLUSION These results indicate that Ca2+-dependent positive inotropic and lusitropic effects of EGCG are mediated in part via activation of the Na+/H+ exchanger and the reverse mode of the Na+/Ca2+ exchanger in the rat myocardium.
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Affiliation(s)
- Mario Lorenz
- Medizinische Klinik mit Schwerpunkt Kardiologie und Angiologie, Charité - Universitätsmedizin Berlin, Campus Mitte, Germany
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Van Linthout S, Spillmann F, Riad A, Trimpert C, Lievens J, Meloni M, Escher F, Filenberg E, Demir O, Li J, Shakibaei M, Schimke I, Staudt A, Felix SB, Schultheiss HP, De Geest B, Tschöpe C. Human Apolipoprotein A-I Gene Transfer Reduces the Development of Experimental Diabetic Cardiomyopathy. Circulation 2008; 117:1563-73. [DOI: 10.1161/circulationaha.107.710830] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
The hallmarks of diabetic cardiomyopathy are cardiac oxidative stress, intramyocardial inflammation, cardiac fibrosis, and cardiac apoptosis. Given the antioxidative, antiinflammatory, and antiapoptotic potential of high-density lipoprotein (HDL), we evaluated the hypothesis that increased HDL via gene transfer (GT) with human apolipoprotein (apo) A-I, the principal apolipoprotein of HDL, may reduce the development of diabetic cardiomyopathy.
Methods and Results—
Intravenous GT with 3×10
12
particles/kg of the E1E3E4-deleted vector
Ad.hapoA-I
, expressing human apoA-I, or
Ad.Null
, containing no expression cassette, was performed 5 days after streptozotocin (STZ) injection. Six weeks after apoA-I GT, HDL cholesterol levels were increased by 1.6-fold (
P
<0.001) compared with diabetic controls injected with the
Ad.Null
vector (STZ-
Ad.Null
). ApoA-I GT and HDL improved LV contractility in vivo and cardiomyocyte contractility ex vivo, respectively. Moreover, apoA-I GT was associated with decreased cardiac oxidative stress and reduced intramyocardial inflammation. In addition, compared with STZ-
Ad.Null
rats, cardiac fibrosis and glycogen accumulation were reduced by 1.7-fold and 3.1-fold, respectively (
P
<0.05). Caspase 3/7 activity was decreased 1.2-fold (
P
<0.05), and the ratio of Bcl-2 to Bax was upregulated 1.9-fold (
P
<0.005), translating to 2.1-fold (
P
<0.05) reduced total number of cardiomyocytes with apoptotic characteristics and 3.0-fold (
P
<0.005) reduced damaged endothelial cells compared with STZ-
Ad.Null
rats. HDL supplementation ex vivo reduced hyperglycemia-induced cardiomyocyte apoptosis by 3.4-fold (
P
<0.005). The apoA-I GT-mediated protection was associated with a 1.6-, 1.6-, and 2.4-fold induction of diabetes-downregulated phospho to Akt, endothelial nitric oxide synthase, and glycogen synthase kinase ratio, respectively (
P
<0.005).
Conclusion—
ApoA-I GT reduced the development of streptozotocin-induced diabetic cardiomyopathy.
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Affiliation(s)
- Sophie Van Linthout
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Frank Spillmann
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Alexander Riad
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Christiane Trimpert
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Joke Lievens
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Marco Meloni
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Felicitas Escher
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Elena Filenberg
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Okan Demir
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Jun Li
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Mehdi Shakibaei
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Ingolf Schimke
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Alexander Staudt
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Stephan B. Felix
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Heinz-Peter Schultheiss
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Bart De Geest
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
| | - Carsten Tschöpe
- From Abteilung für Kardiologie und Pneumologie, Charité-Universitätsklinikum Berlin, Campus Benjamin Franklin, Berlin, Germany (S.V.L., F.S., A.R., M.M., F.E., E.F., O.D., H.-P.S., C. Tschöpe); Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany (C. Trimpert, A.S., S.B.F.); Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium (J. Lievens, B.D.G.); Charité University Medicine Berlin, Campus Mitte, Center for Cardiovascular Research (J
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23
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Kaya Z, Leuschner F, Trimpert C, Göser S, Öttl R, Li J, Felix S, Dengler TJ, Hugo KA, Staudt A. Autoantibodies against Cardiac Troponin I in Patients with Dilated Cardio‐myopathy Predict Improvement of Cardiac Function by Immunoadsorption. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.668.29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ziya Kaya
- Department of CardiologyUniversity of HeidelbergHeidelbergGermany
| | | | | | - Stefan Göser
- Department of CardiologyUniversity of HeidelbergHeidelbergGermany
| | - Renate Öttl
- Department of CardiologyUniversity of HeidelbergHeidelbergGermany
| | - Jin Li
- Department of CardiologyUniversity of HeidelbergHeidelbergGermany
| | - Stephan Felix
- Department of CardiologyUniversity of GreifswaldGreifswaldGermany
| | | | - Katus A. Hugo
- Department of CardiologyUniversity of HeidelbergHeidelbergGermany
| | - Alexander Staudt
- Department of CardiologyUniversity of GreifswaldGreifswaldGermany
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24
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Boese G, Trimpert C, Albrecht W, Malsch G, Groth T, Lendlein A. Membranes from Acrylonitrile-Based Polymers for Selective Cultivation of Human Keratinocytes. ACTA ACUST UNITED AC 2007; 13:2995-3002. [DOI: 10.1089/ten.2006.0442] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Gregor Boese
- Institute of Polymer Research, GKSS Research Center Geesthacht, Teltow, Germany
| | - Christiane Trimpert
- Klinik und Poliklinik für Innere Medizin B, Universitätsklinikum der Ernst-Moritz-Arndt-Universität, Greifswald, Germany
| | - Wolfgang Albrecht
- Institute of Polymer Research, GKSS Research Center Geesthacht, Teltow, Germany
| | - Günter Malsch
- Institute of Polymer Research, GKSS Research Center Geesthacht, Teltow, Germany
| | - Thomas Groth
- Biomedical Materials Group, Department of Pharmaceutics and Biopharmaceutics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Andreas Lendlein
- Institute of Polymer Research, GKSS Research Center Geesthacht, Teltow, Germany
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25
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Kallwellis-Opara A, Staudt A, Trimpert C, Noutsias M, Kühl U, Pauschinger M, Schultheiss HP, Grube M, Böhm M, Baumann G, Völker U, Kroemer HK, Felix SB. Immunoadsorption and subsequent immunoglobulin substitution decreases myocardial gene expression of desmin in dilated cardiomyopathy. J Mol Med (Berl) 2007; 85:1429-35. [DOI: 10.1007/s00109-007-0263-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2006] [Revised: 06/30/2007] [Accepted: 07/24/2007] [Indexed: 01/22/2023]
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26
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Birkenmeier K, Staudt A, Schunck WH, Janke I, Labitzke C, Prange T, Trimpert C, Krieg T, Landsberger M, Stangl V, Felix SB. COX-2-dependent and potentially cardioprotective effects of negative inotropic substances released after ischemia. Am J Physiol Heart Circ Physiol 2007; 293:H2148-54. [PMID: 17660401 DOI: 10.1152/ajpheart.00074.2007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 11/22/2022]
Abstract
During reperfusion, cardiodepressive factors are released from isolated rat hearts after ischemia. The present study analyzes the mechanisms by which these substances mediate their cardiodepressive effect. After 10 min of global stop-flow ischemia, rat hearts were reperfused and coronary effluent was collected over a period of 30 s. We tested the effect of this postischemic effluent on systolic cell shortening and Ca(2+) metabolism by application of fluorescence microscopy of field-stimulated rat cardiomyocytes stained with fura-2 AM. Cells were preincubated with various inhibitors, e.g., the cyclooxygenase (COX) inhibitor indomethacin, the COX-2 inhibitors NS-398 and lumiracoxib, the COX-1 inhibitor SC-560, and the potassium (ATP) channel blocker glibenclamide. Lysates of cardiomyocytes and extracts from whole rat hearts were tested for expression of COX-2 with Western blot analysis. As a result, in contrast to nonischemic effluent (control), postischemic effluent induced a reduction of Ca(2+) transient and systolic cell shortening in the rat cardiomyocytes (P < 0.001 vs. control). After preincubation of cells with indomethacin, NS-398, and lumiracoxib, the negative inotropic effect was attenuated. SC-560 did not influence the effect of postischemic effluent. The inducibly expressed COX-2 was detected in cardiomyocytes prepared for fluorescence microscopy. The effect of postischemic effluent was eliminated with applications of glibenclamide. Furthermore, postischemic effluent significantly reduced the intracellular diastolic and systolic Ca(2+) increase (P < 0.01 vs. control). In conclusion, the cardiodepressive effect of postischemic effluent is COX-2 dependent and protective against Ca(2+) overload in the cells.
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27
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Staudt A, Eichler P, Trimpert C, Felix SB, Greinacher A. FcγReceptors IIa on Cardiomyocytes and Their Potential Functional Relevance in Dilated Cardiomyopathy. J Am Coll Cardiol 2007; 49:1684-92. [PMID: 17448369 DOI: 10.1016/j.jacc.2006.11.051] [Citation(s) in RCA: 57] [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] [Received: 07/20/2006] [Revised: 10/13/2006] [Accepted: 11/06/2006] [Indexed: 01/22/2023]
Abstract
OBJECTIVES The purpose of this study was to investigate how cardiac autoantibodies might contribute to cardiac dysfunction in patients suffering from dilated cardiomyopathy (DCM). BACKGROUND In the majority of DCM patients, it is possible to detect antibodies with negative inotropic effect on cardiomyocytes. The manner in which these antibodies impair cardiac function is poorly understood. METHODS Immunoglobulin (Ig)G was prepared from plasma of 11 DCM patients containing antibodies that induced a negative inotropic effect on cardiomyocytes. We analyzed the effects of antibodies/IgG fragments on calcium transients and on systolic cell shortening of adult rat cardiomyocytes and investigated the dependency of these effects on potential cardiomyocyte Fc receptors. RESULTS In contrast to control subjects, intact IgG from DCM patients reduced calcium transients and cell shortening of cardiomyocytes. The F(ab')2 fragments of these antibodies did not induce these effects but inhibited the functional effects of DCM-IgG of the respective patients' IgG. These effects were also inhibited by Fc fragments of normal IgG. Reconstitution of the Fc part by incubation of cardiomyocytes with DCM-F(ab')2 fragments followed by goat-anti-human-F(ab')-IgG again induced reduction of cell shortening and of calcium transients. In rat and human ventricular cardiomyocytes, Fc(gamma) receptors IIa (CD32) were demonstrated by immunofluorescence. CONCLUSIONS Our findings indicate that DCM-IgG-F(ab')2 bind to their cardiac antigen(s), but the Fc part might trigger the negative inotropic effects via the newly detected Fc(gamma) receptor on cardiomyocytes. These results point to a novel potential mechanism for antibody-induced impairment of cardiac function in DCM patients.
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Affiliation(s)
- Alexander Staudt
- Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany
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28
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Staudt A, Hummel A, Ruppert J, Dörr M, Trimpert C, Birkenmeier K, Krieg T, Staudt Y, Felix SB. Immunoadsorption in dilated cardiomyopathy: 6-month results from a randomized study. Am Heart J 2006; 152:712.e1-6. [PMID: 16996843 DOI: 10.1016/j.ahj.2006.06.027] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [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] [Received: 12/05/2005] [Accepted: 06/26/2006] [Indexed: 01/22/2023]
Abstract
BACKGROUND Various randomized studies evidenced that immunoadsorption (IA) repeated at monthly intervals induced acute and prolonged hemodynamic benefit in patients with severe heart failure due to dilated cardiomyopathy. Some findings indicate that the use of only one course of IA therapy may also induce prolonged beneficial effects. METHODS This randomized study included 22 patients suffering from severe heart failure (left ventricular ejection fraction [LVEF] <35%) due to dilated cardiomyopathy. The first group (11 patients) was treated with four IA courses at monthly intervals. The second group (11 patients) received one IA course only without repetition. In all patients of the 2 groups, each course was performed in one IA session on 5 consecutive days. At 3 and 6 months after the beginning of this study, left ventricular function and hemodynamics were reevaluated in both groups. RESULTS Immunoadsorption treatment repeated at monthly intervals induced improvement in LVEF after 6 months, that is, from 28.1% +/- 1.5% to 37.0% +/- 1.6% (+/-SEM; P < .01 vs baseline). Patients treated in only one IA course experienced comparable improvement of LVEF after 6 months, that is, from 26.5% +/- 2.2% to 34.8% +/- 2.9% (P < .01 vs baseline). In the group with repeated IA courses, cardiac index increased from baseline 2.2 +/- 0.1 to 2.8 +/- 0.2 L min(-1) m(-2) after 6 months (P < .01 vs baseline). In comparison, during the 6 months of this study in the group with one IA course, cardiac index increased from 2.1 +/- 0.1 to 2.7 +/- 0.2 L min(-1) m(-2). After 3 and 6 months, there were no significant differences between the 2 groups with respect to LVEF and all measured hemodynamic parameters. CONCLUSIONS One course of IA treatment may induce improvement of left ventricular function over a period of 6 months, with results comparable to those received by IA treatment repeated at monthly intervals.
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Affiliation(s)
- Alexander Staudt
- Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany.
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29
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Staudt A, Staudt Y, Hummel A, Empen K, Dörr M, Trimpert C, Birkenmeier K, Kühl U, Noutsias M, Russ D, Felix SB. Effects of immunoadsorption on the nt-BNP and nt-ANP plasma levels of patients suffering from dilated cardiomyopathy. Ther Apher Dial 2006; 10:42-8. [PMID: 16556135 DOI: 10.1111/j.1744-9987.2006.00343.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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: 01/22/2023]
Abstract
Immunoadsorption (IA) represents an additional therapeutic approach in patients with severe heart failure due to dilated cardiomyopathy (DCM). nt-BNP and nt-ANP plasma levels are prognostic markers in patients with heart failure. The effect of IA on nt-BNP and nt-ANP plasma levels is unknown. In this case control study, 30 patients suffering from severe heart failure (LVEF < 35%) due to DCM were included. In 15 patients, IA was carried out in four courses of monthly intervals until month 3. For analysis of the acute and prolonged effects, the plasma levels of nt-BNP and nt-ANP were determined before and after each IA course. In 15 comparable DCM patients (controls), plasma levels of nt-BNP and nt-ANP were determined at baseline and after 3 months. LVEF remained stable during this study in the control group. In contrast, in the IA group after 3 months, LVEF increased from 29.7 +/- 1 to 38.6 +/- 2%, P < 0.001. In the control group, the nt-BNP and nt-ANP plasma levels remained stable during the 3 months of the study. In the IA group after the first IA course, the level of nt-BNP was acutely reduced from 1501 +/- 328 to 925 +/- 151 fmol/mL, P < 0.01. In addition, the nt-ANP level was reduced from 4439 +/- 1271 to 2897 +/- 825 fmol/mL, P < 0.01. In the IA group, the reduction of these two parameters remained detectable after 3 months before the last course: nt-BNP: 714 +/- 119 fmol/mL, nt-ANP: 2227 +/- 427 fmol/mL, P < 0.05. The improvement of left ventricular function during IA is accompanied by a reduction of nt-BNP and nt-ANP plasma levels in patients with DCM.
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Affiliation(s)
- Alexander Staudt
- Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany.
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30
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Trimpert C, Boese G, Albrecht W, Richau K, Weigel T, Lendlein A, Groth T. Poly(ether imide) Membranes Modified with Poly(ethylene imine) as Potential Carriers for Epidermal Substitutes. Macromol Biosci 2006; 6:274-84. [PMID: 16565943 DOI: 10.1002/mabi.200500238] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [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: 11/12/2022]
Abstract
Poly(ether imide) (PEI) membranes were modified with a linear low-molecular weight (PETIM_0.6) and a branched high-molecular weight poly(ethylene imine) (PETIM_60). The membrane surfaces became more hydrophilic and the zeta potentials were shifted from negative to positive zeta values after immobilisation of both PETIM. These measurements also indicated the presence of a swollen surface layer in the case of PETIM_60, while a regular structuring of the surface was observed with scanning force microscopy for PETIM_0.6. A human keratinocyte cell line HaCaT was cultured on the different membranes. It was found that HaCaT cell growth was stimulated by PETIM_0.6. Cells reached earlier confluence on this substratum, while their growth was inhibited on a PEI membrane modified with PETIM_60, which makes PEI membranes modified with PETIM_0.6 a promising material for in vitro culture of epidermal transplants.
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Affiliation(s)
- Christiane Trimpert
- GKSS Research Centre, Institute of Polymer Research, Kantstrasse 55, D-14513 Teltow, Germany
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31
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Staudt Y, Trimpert C, Birkenmeier K, Krieg T, Bemmann T, Beug D, Felix SB, Staudt A. Effects of antibodies obtained from patients with dilated cardiomyopathy on the function of isolated rat hearts. Eur J Clin Invest 2006; 36:85-90. [PMID: 16436089 DOI: 10.1111/j.1365-2362.2006.01603.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 01/22/2023]
Abstract
BACKGROUND Cardiac autoantibodies may play a pathophysiological role in cardiac dysfunction of patients suffering from dilated cardiomyopathy (DCM). Immunoadsorption (IA), which removes antibodies from patients' plasma, may consequently improve cardiac function in DCM. The functional effects of DCM antibodies are only partly understood. MATERIALS AND METHODS DCM patients (n = 10) were treated with IA by application of antibody columns directed against human immunoglobulin (Ig). IA was also performed with plasma taken from 10 healthy donors (controls). The antibodies eliminated and purified by IA were collected and dialysed. Rat hearts were isolated and perfused retrogradely via the aorta in Langendorff mode. During constant-pressure and constant-volume perfusion of the hearts, the influence of diluted antibodies on contractility, relaxation, and on coronary perfusion was analysed. RESULTS Antibodies obtained from controls had no effect on contractility and relaxation of isolated perfused hearts during constant-pressure and constant-volume perfusion. In contrast, during constant-pressure perfusion, collected DCM antibodies caused immediate and dose-related reduction of contractility (dLVP/dtmax: dilution -1:32 = -7.1 +/- 1.1%; dilution -1:2 = -20.1 +/- 2.1%; P < 0.001) and diastolic relaxation (dLVP/dtmin: dilution -1:32 = -11.1 +/- 1.5%; dilution -1:2 = -23.9 +/- 2.2%; P < 0.001). The heart rate did not change significantly in either group. The effects of DCM antibodies on contractility and relaxation remained detectable during constant-volume perfusion. The observed reduction of contractility and diastolic relaxation was accompanied by impairment of coronary perfusion. CONCLUSION In the rat heart, antibodies obtained from DCM patients may impair contractility and relaxation, and thereby probably also coronary perfusion.
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Affiliation(s)
- Y Staudt
- Klinik für Innere Medizin B, Ernst-Moritz-Arndt-Universität, Greifswald, Germany
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