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Liutkute A, Prosser BL, Voigt N. Microtubules: highway to … arrhythmia? Cardiovasc Res 2024:cvae072. [PMID: 38637305 DOI: 10.1093/cvr/cvae072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 04/20/2024] Open
Affiliation(s)
- Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
| | - Benjamin L Prosser
- Department of Physiology, Pennsylvania Muscle Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, USA
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
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2
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Seibertz F, Voigt N. High-throughput methods for cardiac cellular electrophysiology studies: the road to personalized medicine. Am J Physiol Heart Circ Physiol 2024; 326:H938-H949. [PMID: 38276947 DOI: 10.1152/ajpheart.00599.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 01/22/2024] [Accepted: 01/22/2024] [Indexed: 01/27/2024]
Abstract
Personalized medicine refers to the tailored application of medical treatment at an individual level, considering the specific genotype or phenotype of each patient for targeted therapy. In the context of cardiovascular diseases, implementing personalized medicine is challenging due to the high costs involved and the slow pace of identifying the pathogenicity of genetic variants, deciphering molecular mechanisms of disease, and testing treatment approaches. Scalable cellular models such as human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) serve as useful in vitro tools that reflect individual patient genetics and retain clinical phenotypes. High-throughput functional assessment of these constructs is necessary to rapidly assess cardiac pathogenicity and test new therapeutics if personalized medicine is to become a reality. High-throughput photometry recordings of single cells coupled with potentiometric probes offer cost-effective alternatives to traditional patch-clamp assessments of cardiomyocyte action potential characteristics. Importantly, automated patch-clamp (APC) is rapidly emerging in the pharmaceutical industry and academia as a powerful method to assess individual membrane-bound ionic currents and ion channel biophysics over multiple cells in parallel. Now amenable to primary cell and hiPSC-CM measurement, APC represents an exciting leap forward in the characterization of a multitude of molecular mechanisms that underlie clinical cardiac phenotypes. This review provides a summary of state-of-the-art high-throughput electrophysiological techniques to assess cardiac electrophysiology and an overview of recent works that successfully integrate these methods into basic science research that could potentially facilitate future implementation of personalized medicine at a clinical level.
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Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells," Georg-August University Göttingen, Göttingen, Germany
- Nanion Technologies, GmbH, Munich, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells," Georg-August University Göttingen, Göttingen, Germany
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Hegemann N, Barth L, Döring Y, Voigt N, Grune J. Implications for neutrophils in cardiac arrhythmias. Am J Physiol Heart Circ Physiol 2024; 326:H441-H458. [PMID: 38099844 DOI: 10.1152/ajpheart.00590.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/08/2023] [Accepted: 12/13/2023] [Indexed: 02/03/2024]
Abstract
Cardiac arrhythmias commonly occur as a result of aberrant electrical impulse formation or conduction in the myocardium. Frequently discussed triggers include underlying heart diseases such as myocardial ischemia, electrolyte imbalances, or genetic anomalies of ion channels involved in the tightly regulated cardiac action potential. Recently, the role of innate immune cells in the onset of arrhythmic events has been highlighted in numerous studies, correlating leukocyte expansion in the myocardium to increased arrhythmic burden. Here, we aim to call attention to the role of neutrophils in the pathogenesis of cardiac arrhythmias and their expansion during myocardial ischemia and infectious disease manifestation. In addition, we will elucidate molecular mechanisms associated with neutrophil activation and discuss their involvement as direct mediators of arrhythmogenicity.
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Affiliation(s)
- Niklas Hegemann
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Lukas Barth
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
| | - Yannic Döring
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (DZHK), Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (DZHK), Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Jana Grune
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum der Charité (DHZC), Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- German Centre for Cardiovascular Research (DZHK), Berlin, Germany
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4
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Rapöhn M, Cyganek L, Voigt N, Hasenfuß G, Lehnart SE, Wegener JW. Noninvasive analysis of contractility during identical maturations revealed two phenotypes in ventricular but not in atrial iPSC-CM. Am J Physiol Heart Circ Physiol 2024; 326:H599-H611. [PMID: 38180453 DOI: 10.1152/ajpheart.00527.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 12/06/2023] [Accepted: 01/02/2024] [Indexed: 01/06/2024]
Abstract
Patient-derived induced pluripotent stem cells (iPSCs) can be differentiated into atrial and ventricular cardiomyocytes to allow for personalized drug screening. A hallmark of differentiation is the manifestation of spontaneous beating in a two-dimensional (2-D) cell culture. However, an outstanding observation is the high variability in this maturation process. We valued that contractile parameters change during differentiation serving as an indicator of maturation. Consequently, we recorded noninvasively spontaneous motion activity during the differentiation of male iPSC toward iPSC cardiomyocytes (iPSC-CMs) to further analyze similar maturated iPSC-CMs. Surprisingly, our results show that identical differentiations into ventricular iPSC-CMs are variable with respect to contractile parameters resulting in two distinct subpopulations of ventricular-like cells. In contrast, differentiation into atrial iPSC-CMs resulted in only one phenotype. We propose that the noninvasive and cost-effective recording of contractile activity during maturation using a smartphone device may help to reduce the variability in results frequently reported in studies on ventricular iPSC-CMs.NEW & NOTEWORTHY Differentiation of induced pluripotent stem cells (iPSCs) into iPSC-derived cardiomyocytes (iPSC-CMs) exhibits a high variability in mature parameters. Here, we monitored noninvasively contractile parameters of iPSC-CM during full-time differentiation using a smartphone device. Our results show that parallel maturations of iPSCs into ventricular iPSC-CMs, but not into atrial iPSC-CMs, resulted in two distinct subpopulations of iPSC-CMs. These findings suggest that our cost-effective method may help to compare iPSC-CMs at the same maturation level.
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Affiliation(s)
- Marcel Rapöhn
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
| | - Lukas Cyganek
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells," University of Göttingen, Göttingen, Germany
| | - Niels Voigt
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
- Department of Pharmacology and Toxicology, University Medical Center of Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells," University of Göttingen, Göttingen, Germany
| | - Gerd Hasenfuß
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
| | - Stephan E Lehnart
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells," University of Göttingen, Göttingen, Germany
| | - Jörg W Wegener
- Department of Cardiology and Pulmonology, University Medical Center of Göttingen, Göttingen, Germany
- German Centre for Cardiovascular Research (Deutsches Zentrum für Herz-Kreislaufforschung), Göttingen, Germany
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Paasche A, Wiedmann F, Kraft M, Seibertz F, Herlt V, Blochberger PL, Jávorszky N, Beck M, Weirauch L, Seeger T, Blank A, Haefeli WE, Arif R, Meyer AL, Warnecke G, Karck M, Voigt N, Frey N, Schmidt C. Acute antiarrhythmic effects of SGLT2 inhibitors-dapagliflozin lowers the excitability of atrial cardiomyocytes. Basic Res Cardiol 2024; 119:93-112. [PMID: 38170280 PMCID: PMC10837223 DOI: 10.1007/s00395-023-01022-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 11/08/2023] [Accepted: 11/24/2023] [Indexed: 01/05/2024]
Abstract
In recent years, SGLT2 inhibitors have become an integral part of heart failure therapy, and several mechanisms contributing to cardiorenal protection have been identified. In this study, we place special emphasis on the atria and investigate acute electrophysiological effects of dapagliflozin to assess the antiarrhythmic potential of SGLT2 inhibitors. Direct electrophysiological effects of dapagliflozin were investigated in patch clamp experiments on isolated atrial cardiomyocytes. Acute treatment with elevated-dose dapagliflozin caused a significant reduction of the action potential inducibility, the amplitude and maximum upstroke velocity. The inhibitory effects were reproduced in human induced pluripotent stem cell-derived cardiomyocytes, and were more pronounced in atrial compared to ventricular cells. Hypothesizing that dapagliflozin directly affects the depolarization phase of atrial action potentials, we examined fast inward sodium currents in human atrial cardiomyocytes and found a significant decrease of peak sodium current densities by dapagliflozin, accompanied by a moderate inhibition of the transient outward potassium current. Translating these findings into a porcine large animal model, acute elevated-dose dapagliflozin treatment caused an atrial-dominant reduction of myocardial conduction velocity in vivo. This could be utilized for both, acute cardioversion of paroxysmal atrial fibrillation episodes and rhythm control of persistent atrial fibrillation. In this study, we show that dapagliflozin alters the excitability of atrial cardiomyocytes by direct inhibition of peak sodium currents. In vivo, dapagliflozin exerts antiarrhythmic effects, revealing a potential new additional role of SGLT2 inhibitors in the treatment of atrial arrhythmias.
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Affiliation(s)
- Amelie Paasche
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Felix Wiedmann
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Manuel Kraft
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research) Partner Site Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Robert Koch Strasse 40, 37075, Göttingen, Germany
| | - Valerie Herlt
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Pablo L Blochberger
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Natasa Jávorszky
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Moritz Beck
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Leo Weirauch
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Timon Seeger
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
| | - Antje Blank
- Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Walter E Haefeli
- Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Rawa Arif
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Anna L Meyer
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Gregor Warnecke
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Matthias Karck
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research) Partner Site Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Robert Koch Strasse 40, 37075, Göttingen, Germany
| | - Norbert Frey
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Constanze Schmidt
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany.
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
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Bloothooft M, Verbruggen B, Seibertz F, van der Heyden MAG, Voigt N, de Boer TP. Recording ten-fold larger I Kr conductances with automated patch clamping using equimolar Cs + solutions. Front Physiol 2024; 15:1298340. [PMID: 38328302 PMCID: PMC10847579 DOI: 10.3389/fphys.2024.1298340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 01/09/2024] [Indexed: 02/09/2024] Open
Abstract
Background: The rapid delayed rectifier potassium current (IKr) is important for cardiac repolarization and is most often involved in drug-induced arrhythmias. However, accurately measuring this current can be challenging in human-induced pluripotent stem cell (hiPSC)-derived cardiomyocytes because of its small current density. Interestingly, the ion channel conducting IKr, hERG channel, is not only permeable to K+ ions but also to Cs+ ions when present in equimolar concentrations inside and outside of the cell. Methods: In this study, IhERG was measured from Chinese hamster ovary (CHO)-hERG cells and hiPSC-CM using either Cs+ or K+ as the charge carrier. Equimolar Cs+ has been used in the literature in manual patch-clamp experiments, and here, we apply this approach using automated patch-clamp systems. Four different (pre)clinical drugs were tested to compare their effects on Cs+- and K+-based currents. Results: Using equimolar Cs+ solutions gave rise to approximately ten-fold larger hERG conductances. Comparison of Cs+- and K+-mediated currents upon application of dofetilide, desipramine, moxifloxacin, or LUF7244 revealed many similarities in inhibition or activation properties of the drugs studied. Using equimolar Cs+ solutions gave rise to approximately ten-fold larger hERG conductances. In hiPSC-CM, the Cs+-based conductance is larger compared to the known K+-based conductance, and the Cs+ hERG conductance can be inhibited similarly to the K+-based conductance. Conclusion: Using equimolar Cs+ instead of K+ for IhERG measurements in an automated patch-clamp system gives rise to a new method by which, for example, quick scans can be performed on effects of drugs on hERG currents. This application is specifically relevant when such experiments are performed using cells which express small IKr current densities in combination with small membrane capacitances.
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Affiliation(s)
- Meye Bloothooft
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| | - Bente Verbruggen
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
- Nanion Technologies GmbH, Munich, Germany
| | - Marcel A. G. van der Heyden
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
| | - Teun P. de Boer
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
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7
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Seibertz F, Rubio T, Springer R, Popp F, Ritter M, Liutkute A, Bartelt L, Stelzer L, Haghighi F, Pietras J, Windel H, Pedrosa NDI, Rapedius M, Doering Y, Solano R, Hindmarsh R, Shi R, Tiburcy M, Bruegmann T, Kutschka I, Streckfuss-Bömeke K, Kensah G, Cyganek L, Zimmermann WH, Voigt N. Atrial fibrillation-associated electrical remodelling in human induced pluripotent stem cell-derived atrial cardiomyocytes: a novel pathway for antiarrhythmic therapy development. Cardiovasc Res 2023; 119:2623-2637. [PMID: 37677054 PMCID: PMC10730244 DOI: 10.1093/cvr/cvad143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 07/18/2023] [Accepted: 08/03/2023] [Indexed: 09/09/2023] Open
Abstract
AIMS Atrial fibrillation (AF) is associated with tachycardia-induced cellular electrophysiology alterations which promote AF chronification and treatment resistance. Development of novel antiarrhythmic therapies is hampered by the absence of scalable experimental human models that reflect AF-associated electrical remodelling. Therefore, we aimed to assess if AF-associated remodelling of cellular electrophysiology can be simulated in human atrial-like cardiomyocytes derived from induced pluripotent stem cells in the presence of retinoic acid (iPSC-aCM), and atrial-engineered human myocardium (aEHM) under short term (24 h) and chronic (7 days) tachypacing (TP). METHODS AND RESULTS First, 24-h electrical pacing at 3 Hz was used to investigate whether AF-associated remodelling in iPSC-aCM and aEHM would ensue. Compared to controls (24 h, 1 Hz pacing) TP-stimulated iPSC-aCM presented classical hallmarks of AF-associated remodelling: (i) decreased L-type Ca2+ current (ICa,L) and (ii) impaired activation of acetylcholine-activated inward-rectifier K+ current (IK,ACh). This resulted in action potential shortening and an absent response to the M-receptor agonist carbachol in both iPSC-aCM and aEHM subjected to TP. Accordingly, mRNA expression of the channel-subunit Kir3.4 was reduced. Selective IK,ACh blockade with tertiapin reduced basal inward-rectifier K+ current only in iPSC-aCM subjected to TP, thereby unmasking an agonist-independent constitutively active IK,ACh. To allow for long-term TP, we developed iPSC-aCM and aEHM expressing the light-gated ion-channel f-Chrimson. The same hallmarks of AF-associated remodelling were observed after optical-TP. In addition, continuous TP (7 days) led to (i) increased amplitude of inward-rectifier K+ current (IK1), (ii) hyperpolarization of the resting membrane potential, (iii) increased action potential-amplitude and upstroke velocity as well as (iv) reversibly impaired contractile function in aEHM. CONCLUSIONS Classical hallmarks of AF-associated remodelling were mimicked through TP of iPSC-aCM and aEHM. The use of the ultrafast f-Chrimson depolarizing ion channel allowed us to model the time-dependence of AF-associated remodelling in vitro for the first time. The observation of electrical remodelling with associated reversible contractile dysfunction offers a novel platform for human-centric discovery of antiarrhythmic therapies.
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Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
| | - Tony Rubio
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Robin Springer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Fiona Popp
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Melanie Ritter
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Lena Bartelt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Lea Stelzer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Fereshteh Haghighi
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Jan Pietras
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Hendrik Windel
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Núria Díaz i Pedrosa
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | | | - Yannic Doering
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Richard Solano
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Robin Hindmarsh
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Germany
| | - Runzhu Shi
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Malte Tiburcy
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Tobias Bruegmann
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Ingo Kutschka
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Katrin Streckfuss-Bömeke
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Germany
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
| | - George Kensah
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Lukas Cyganek
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Germany
| | - Wolfram H Zimmermann
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), Göttingen, Germany
- Campus-Institute Data Science (CIDAS), University of Göttingen, Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
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8
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Kyriakopoulou E, Versteeg D, de Ruiter H, Perini I, Seibertz F, Döring Y, Zentilin L, Tsui H, van Kampen SJ, Tiburcy M, Meyer T, Voigt N, Tintelen VJP, Zimmermann WH, Giacca M, van Rooij E. Therapeutic efficacy of AAV-mediated restoration of PKP2 in arrhythmogenic cardiomyopathy. Nat Cardiovasc Res 2023; 2:1262-1276. [PMID: 38665939 PMCID: PMC11041734 DOI: 10.1038/s44161-023-00378-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 10/27/2023] [Indexed: 04/28/2024]
Abstract
Arrhythmogenic cardiomyopathy is a severe cardiac disorder characterized by lethal arrhythmias and sudden cardiac death, with currently no effective treatment. Plakophilin 2 (PKP2) is the most frequently affected gene. Here we show that adeno-associated virus (AAV)-mediated delivery of PKP2 in PKP2c.2013delC/WT induced pluripotent stem cell-derived cardiomyocytes restored not only cardiac PKP2 levels but also the levels of other junctional proteins, found to be decreased in response to the mutation. PKP2 restoration improved sodium conduction, indicating rescue of the arrhythmic substrate in PKP2 mutant induced pluripotent stem cell-derived cardiomyocytes. Additionally, it enhanced contractile function and normalized contraction kinetics in PKP2 mutant engineered human myocardium. Recovery of desmosomal integrity and cardiac function was corroborated in vivo, by treating heterozygous Pkp2c.1755delA knock-in mice. Long-term treatment with AAV9-PKP2 prevented cardiac dysfunction in 12-month-old Pkp2c.1755delA/WT mice, without affecting wild-type mice. These findings encourage clinical exploration of PKP2 gene therapy for patients with PKP2 haploinsufficiency.
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Affiliation(s)
- Eirini Kyriakopoulou
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Danielle Versteeg
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Hesther de Ruiter
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Ilaria Perini
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- Nanion Technologies GmbH, Munich, Germany
| | - Yannic Döring
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Lorena Zentilin
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Hoyee Tsui
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | | | - Malte Tiburcy
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Tim Meyer
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
| | | | - Wolfram H. Zimmermann
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), Göttingen, Germany
| | - Mauro Giacca
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, King’s College London, London, UK
| | - Eva van Rooij
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
- Department of Cardiology, University Medical Center Utrecht, Utrecht, the Netherlands
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Mustroph J, Baier MJ, Unsin D, Provaznik Z, Kozakov K, Lebek S, Tarnowski D, Schildt S, Voigt N, Wagner S, Maier LS, Neef S. Ethanol-Induced Atrial Fibrillation Results From Late INa and Can Be Prevented by Ranolazine. Circulation 2023; 148:698-700. [PMID: 37603603 PMCID: PMC10437457 DOI: 10.1161/circulationaha.123.064561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Affiliation(s)
- Julian Mustroph
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Maria J. Baier
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Denise Unsin
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Zdenek Provaznik
- Cardiothoracic Surgery (Z.P., K.K.), University Medical Center Regensburg, Germany
| | - Kostiantyn Kozakov
- Cardiothoracic Surgery (Z.P., K.K.), University Medical Center Regensburg, Germany
| | - Simon Lebek
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Daniel Tarnowski
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Sönke Schildt
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V.)
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Germany (N.V.)
| | - Stefan Wagner
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Lars S. Maier
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
| | - Stefan Neef
- Departments of Internal Medicine II (J.M., M.J.B., D.U., S.L., D.T., S.S., S.W., L.S.M., S.N.), University Medical Center Regensburg, Germany
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Voigt N, Seibertz F, Fakuade FE. Vicious Twins: RyR2 Dysfunction and Structural Remodeling. Circ Res 2023; 133:193-195. [PMID: 37410856 DOI: 10.1161/circresaha.123.323144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Affiliation(s)
- Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| | - Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
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11
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Dai Y, Ignatyeva N, Xu H, Wali R, Toischer K, Brandenburg S, Lenz C, Pronto J, Fakuade FE, Sossalla S, Zeisberg EM, Janshoff A, Kutschka I, Voigt N, Urlaub H, Rasmussen TB, Mogensen J, Lehnart SE, Hasenfuss G, Ebert A. An Alternative Mechanism of Subcellular Iron Uptake Deficiency in Cardiomyocytes. Circ Res 2023; 133:e19-e46. [PMID: 37313752 DOI: 10.1161/circresaha.122.321157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 09/05/2022] [Accepted: 05/26/2023] [Indexed: 06/15/2023]
Abstract
BACKGROUND Systemic defects in intestinal iron absorption, circulation, and retention cause iron deficiency in 50% of patients with heart failure. Defective subcellular iron uptake mechanisms that are independent of systemic absorption are incompletely understood. The main intracellular route for iron uptake in cardiomyocytes is clathrin-mediated endocytosis. METHODS We investigated subcellular iron uptake mechanisms in patient-derived and CRISPR/Cas-edited induced pluripotent stem cell-derived cardiomyocytes as well as patient-derived heart tissue. We used an integrated platform of DIA-MA (mass spectrometry data-independent acquisition)-based proteomics and signaling pathway interrogation. We employed a genetic induced pluripotent stem cell model of 2 inherited mutations (TnT [troponin T]-R141W and TPM1 [tropomyosin 1]-L185F) that lead to dilated cardiomyopathy (DCM), a frequent cause of heart failure, to study the underlying molecular dysfunctions of DCM mutations. RESULTS We identified a druggable molecular pathomechanism of impaired subcellular iron deficiency that is independent of systemic iron metabolism. Clathrin-mediated endocytosis defects as well as impaired endosome distribution and cargo transfer were identified as a basis for subcellular iron deficiency in DCM-induced pluripotent stem cell-derived cardiomyocytes. The clathrin-mediated endocytosis defects were also confirmed in the hearts of patients with DCM with end-stage heart failure. Correction of the TPM1-L185F mutation in DCM patient-derived induced pluripotent stem cells, treatment with a peptide, Rho activator II, or iron supplementation rescued the molecular disease pathway and recovered contractility. Phenocopying the effects of the TPM1-L185F mutation into WT induced pluripotent stem cell-derived cardiomyocytes could be ameliorated by iron supplementation. CONCLUSIONS Our findings suggest that impaired endocytosis and cargo transport resulting in subcellular iron deficiency could be a relevant pathomechanism for patients with DCM carrying inherited mutations. Insight into this molecular mechanism may contribute to the development of treatment strategies and risk management in heart failure.
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Affiliation(s)
- Yuanyuan Dai
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
| | - Nadezda Ignatyeva
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
| | - Hang Xu
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
| | - Ruheen Wali
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
| | - Karl Toischer
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Heart Center, Clinic for Cardiology and Pneumology, University Medical Center Goettingen (K.T., S.B., S.S., G.H.), University of Goettingen, Germany
| | - Sören Brandenburg
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Heart Center, Clinic for Cardiology and Pneumology, University Medical Center Goettingen (K.T., S.B., S.S., G.H.), University of Goettingen, Germany
| | - Christof Lenz
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Department of Clinical Chemistry, University Medical Center Goettingen, (C.L., H.U.), University of Goettingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC; C.L., F.E.F., N.V., S.E.L.), University of Goettingen, Germany
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Goettingen (C.L., H.U.)
| | - Julius Pronto
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, (J.P., F.E.F., N.V.), University of Goettingen, Germany
| | - Funsho E Fakuade
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, (J.P., F.E.F., N.V.), University of Goettingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC; C.L., F.E.F., N.V., S.E.L.), University of Goettingen, Germany
| | - Samuel Sossalla
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- Heart Center, Clinic for Cardiology and Pneumology, University Medical Center Goettingen (K.T., S.B., S.S., G.H.), University of Goettingen, Germany
- Department for Internal Medicine II, University Medical Center Regensburg (S.S.)
| | - Elisabeth M Zeisberg
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
| | - Andreas Janshoff
- Institute for Physical Chemistry (A.J.), University of Goettingen, Germany
| | - Ingo Kutschka
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Department of Thoracic and Cardiovascular Surgery, University Medical Center Göttingen (I.K.)
| | - Niels Voigt
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, (J.P., F.E.F., N.V.), University of Goettingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC; C.L., F.E.F., N.V., S.E.L.), University of Goettingen, Germany
| | - Henning Urlaub
- Department of Clinical Chemistry, University Medical Center Goettingen, (C.L., H.U.), University of Goettingen, Germany
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Goettingen (C.L., H.U.)
| | | | - Jens Mogensen
- Department of Cardiology, Aalborg University Hospital, Denmark (J.M.)
| | - Stephan E Lehnart
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC; C.L., F.E.F., N.V., S.E.L.), University of Goettingen, Germany
| | - Gerd Hasenfuss
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
- Heart Center, Clinic for Cardiology and Pneumology, University Medical Center Goettingen (K.T., S.B., S.S., G.H.), University of Goettingen, Germany
| | - Antje Ebert
- Heart Research Center Goettingen, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Georg-August University of Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., S.S., E.M.Z., S.E.L., G.H., A.E.)
- DZHK (German Center for Cardiovascular Research), partner site Goettingen, Germany (Y.D., N.I., H.X., R.W., K.T., S.B., C.L., J.P., F.E.F., E.M.Z., I.K., N.V., S.E.L., G.H., A.E.)
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Seibertz F, Sutanto H, Dülk R, Pronto JRD, Springer R, Rapedius M, Liutkute A, Ritter M, Jung P, Stelzer L, Hüsgen LM, Klopp M, Rubio T, Fakuade FE, Mason FE, Hartmann N, Pabel S, Streckfuss-Bömeke K, Cyganek L, Sossalla S, Heijman J, Voigt N. Electrophysiological and calcium-handling development during long-term culture of human-induced pluripotent stem cell-derived cardiomyocytes. Basic Res Cardiol 2023; 118:14. [PMID: 37020075 PMCID: PMC10076390 DOI: 10.1007/s00395-022-00973-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 04/07/2023]
Abstract
Human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are increasingly used for personalised medicine and preclinical cardiotoxicity testing. Reports on hiPSC-CM commonly describe heterogenous functional readouts and underdeveloped or immature phenotypical properties. Cost-effective, fully defined monolayer culture is approaching mainstream adoption; however, the optimal age at which to utilise hiPSC-CM is unknown. In this study, we identify, track and model the dynamic developmental behaviour of key ionic currents and Ca2+-handling properties in hiPSC-CM over long-term culture (30-80 days). hiPSC-CMs > 50 days post differentiation show significantly larger ICa,L density along with an increased ICa,L-triggered Ca2+-transient. INa and IK1 densities significantly increase in late-stage cells, contributing to increased upstroke velocity and reduced action potential duration, respectively. Importantly, our in silico model of hiPSC-CM electrophysiological age dependence confirmed IK1 as the key ionic determinant of action potential shortening in older cells. We have made this model available through an open source software interface that easily allows users to simulate hiPSC-CM electrophysiology and Ca2+-handling and select the appropriate age range for their parameter of interest. This tool, together with the insights from our comprehensive experimental characterisation, could be useful in future optimisation of the culture-to-characterisation pipeline in the field of hiPSC-CM research.
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Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Henry Sutanto
- Department of Cardiology, Cardiovascular Research Institute Maastricht, Faculty of Health, Medicine and Life Sciences, Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands
| | - Rebekka Dülk
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Robin Springer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | | | - Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Melanie Ritter
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Philipp Jung
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Lea Stelzer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Luisa M Hüsgen
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Marie Klopp
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Tony Rubio
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Fleur E Mason
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Nico Hartmann
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
| | - Steffen Pabel
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Katrin Streckfuss-Bömeke
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
| | - Lukas Cyganek
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
| | - Samuel Sossalla
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Jordi Heijman
- Department of Cardiology, Cardiovascular Research Institute Maastricht, Faculty of Health, Medicine and Life Sciences, Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands.
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany.
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany.
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany.
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13
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Grammatika Pavlidou N, Dobrev S, Beneke K, Reinhardt F, Pecha S, Jacquet E, Abu-Taha IH, Schmidt C, Voigt N, Kamler M, Schnabel RB, Baczkó I, Garnier A, Reichenspurner H, Nikolaev VO, Dobrev D, Molina CE. Phosphodiesterase 8 governs cAMP/PKA-dependent reduction of L-type calcium current in human atrial fibrillation: a novel arrhythmogenic mechanism. Eur Heart J 2023:7049990. [PMID: 36810794 DOI: 10.1093/eurheartj/ehad086] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 12/22/2022] [Accepted: 02/03/2023] [Indexed: 02/24/2023] Open
Abstract
AIMS Atrial fibrillation (AF) is associated with altered cAMP/PKA signaling and an AF-promoting reduction of L-type Ca2+-current (ICa,L), the mechanisms of which are poorly understood. Cyclic-nucleotide phosphodiesterases (PDEs) degrade cAMP and regulate PKA-dependent phosphorylation of key calcium-handling proteins, including the ICa,L-carrying Cav1.2α1C subunit. The aim was to assess whether altered function of PDE type-8 (PDE8) isoforms contributes to the reduction of ICa,L in persistent (chronic) AF (cAF) patients. METHODS AND RESULTS mRNA, protein levels, and localization of PDE8A and PDE8B isoforms were measured by RT-qPCR, western blot, co-immunoprecipitation and immunofluorescence. PDE8 function was assessed by FRET, patch-clamp and sharp-electrode recordings. PDE8A gene and protein levels were higher in paroxysmal AF (pAF) vs. sinus rhythm (SR) patients, whereas PDE8B was upregulated in cAF only. Cytosolic abundance of PDE8A was higher in atrial pAF myocytes, whereas PDE8B tended to be more abundant at the plasmalemma in cAF myocytes. In co-immunoprecipitation, only PDE8B2 showed binding to Cav1.2α1C subunit which was strongly increased in cAF. Accordingly, Cav1.2α1C showed a lower phosphorylation at Ser1928 in association with decreased ICa,L in cAF. Selective PDE8 inhibition increased Ser1928 phosphorylation of Cav1.2α1C, enhanced cAMP at the subsarcolemma and rescued the lower ICa,L in cAF, which was accompanied by a prolongation of action potential duration at 50% of repolarization. CONCLUSION Both PDE8A and PDE8B are expressed in human heart. Upregulation of PDE8B isoforms in cAF reduces ICa,L via direct interaction of PDE8B2 with the Cav1.2α1C subunit. Thus, upregulated PDE8B2 might serve as a novel molecular mechanism of the proarrhythmic reduction of ICa,L in cAF.
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Affiliation(s)
- Nefeli Grammatika Pavlidou
- Institute of Experimental Cardiovascular Research and University Center of Cardiovascular Sciences, University Medical Center Hamburg Eppendorf (UKE), Martinistrasse 52, W23, 20246 Hamburg, Germany.,German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany
| | - Shokoufeh Dobrev
- Institute of Pharmacology, West German Heart and Vascular Center, University Duisburg-Essen, Hufelandstrasse 55, 45147 Essen, Germany
| | - Kira Beneke
- Institute of Experimental Cardiovascular Research and University Center of Cardiovascular Sciences, University Medical Center Hamburg Eppendorf (UKE), Martinistrasse 52, W23, 20246 Hamburg, Germany.,German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany
| | - Franziska Reinhardt
- Institute of Experimental Cardiovascular Research and University Center of Cardiovascular Sciences, University Medical Center Hamburg Eppendorf (UKE), Martinistrasse 52, W23, 20246 Hamburg, Germany.,German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany.,Department of Cardiovascular Surgery, University Heart Center Hamburg, Martinistrasse 52, O70, 20246 Hamburg, Germany
| | - Simon Pecha
- German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany.,Department of Cardiovascular Surgery, University Heart Center Hamburg, Martinistrasse 52, O70, 20246 Hamburg, Germany
| | - Eric Jacquet
- Université Paris-Saclay, CNRS, Institut de Chimie des Substances Naturelles, UPR 2301, 1 avenue de la Terrasse, 91198 Gif-sur-Yvette, France
| | - Issam H Abu-Taha
- Institute of Pharmacology, West German Heart and Vascular Center, University Duisburg-Essen, Hufelandstrasse 55, 45147 Essen, Germany
| | - Constanze Schmidt
- Department of Cardiology, University Medical Center Heidelberg, Im Neuenheimer Feld 672, 69120 Heidelberg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert-Koch-Strasse 40, 37075 Göttingen, Germany.,German Centre for Cardiovascular Research (DZHK), partner Site Göttingen, Potsdamer Strasse 58, 10785 Berlin, Germany.,Cluster of Excellence 'Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells' (MBExC), University of Göttingen, Robert-Koch- Strasse 40, 37075 Göttingen, Germany
| | - Markus Kamler
- Department of Thoracic and Cardiovascular Surgery, West German Heart and Vascular Center, University Duisburg-Essen, Hufelandstrasse 55, 45147 Essen, Germany
| | - Renate B Schnabel
- German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany.,Cardiology Department, University Heart and Vascular Centre Hamburg-Eppendorf, Martinistrasse 52, O70, 20246 Hamburg, Germany
| | - Istvan Baczkó
- Department Pharmacology and Pharmacotherapy, University of Szeged, H-6721, Szeged, Dóm tér 12, Szeged, Hungary
| | - Anne Garnier
- Inserm, UMR-S 1180, Université Paris-Saclay, Faculté de pharmacie, 17 avenue des Sciences, 91400 Orsay, France
| | - Hermann Reichenspurner
- German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany.,Department of Cardiovascular Surgery, University Heart Center Hamburg, Martinistrasse 52, O70, 20246 Hamburg, Germany
| | - Viacheslav O Nikolaev
- Institute of Experimental Cardiovascular Research and University Center of Cardiovascular Sciences, University Medical Center Hamburg Eppendorf (UKE), Martinistrasse 52, W23, 20246 Hamburg, Germany.,German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany
| | - Dobromir Dobrev
- Institute of Pharmacology, West German Heart and Vascular Center, University Duisburg-Essen, Hufelandstrasse 55, 45147 Essen, Germany.,Department of Medicine and Research Center, Montreal Heart Institute and Université de Montréal, 4100 Molson Street, Suite 340, H1Y 3N1 Montréal, Canada.,Department of Molecular Physiology & Biophysics, Baylor College of Medicine, One Baylor Plaza, 77030 Houston, USA
| | - Cristina E Molina
- Institute of Experimental Cardiovascular Research and University Center of Cardiovascular Sciences, University Medical Center Hamburg Eppendorf (UKE), Martinistrasse 52, W23, 20246 Hamburg, Germany.,German Centre for Cardiovascular Research (DZHK), partner site Hamburg/Kiel/Lübeck, Potsdamer Strasse 58, 10785 Berlin, Germany.,Institute of Pharmacology, West German Heart and Vascular Center, University Duisburg-Essen, Hufelandstrasse 55, 45147 Essen, Germany
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14
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Voigt N, Maack C, Pronto JRD. Targeting Mitochondrial Calcium Handling to Treat Atrial Fibrillation. J Am Coll Cardiol 2022; 80:2220-2223. [DOI: 10.1016/j.jacc.2022.09.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 09/26/2022] [Indexed: 11/29/2022]
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15
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Rapedius M, Obergrussberger A, Humphries ESA, Scholz S, Rinke-Weiss I, Goetze TA, Brinkwirth N, Rotordam MG, Strassmaier T, Randolph A, Friis S, Liutkute A, Seibertz F, Voigt N, Fertig N. There is no F in APC: Using physiological fluoride-free solutions for high throughput automated patch clamp experiments. Front Mol Neurosci 2022; 15:982316. [PMID: 36072300 PMCID: PMC9443850 DOI: 10.3389/fnmol.2022.982316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 06/30/2022] [Accepted: 07/26/2022] [Indexed: 11/13/2022] Open
Abstract
Fluoride has been used in the internal recording solution for manual and automated patch clamp experiments for decades because it helps to improve the seal resistance and promotes longer lasting recordings. In manual patch clamp, fluoride has been used to record voltage-gated Na (NaV) channels where seal resistance and access resistance are critical for good voltage control. In automated patch clamp, suction is applied from underneath the patch clamp chip to attract a cell to the hole and obtain a good seal. Since the patch clamp aperture cannot be moved to improve the seal like the patch clamp pipette in manual patch clamp, automated patch clamp manufacturers use internal fluoride to improve the success rate for obtaining GΩ seals. However, internal fluoride can affect voltage-dependence of activation and inactivation, as well as affecting internal second messenger systems and therefore, it is desirable to have the option to perform experiments using physiological, fluoride-free internal solution. We have developed an approach for high throughput fluoride-free recordings on a 384-well based automated patch clamp system with success rates >40% for GΩ seals. We demonstrate this method using hERG expressed in HEK cells, as well as NaV1.5, NaV1.7, and KCa3.1 expressed in CHO cells. We describe the advantages and disadvantages of using fluoride and provide examples of where fluoride can be used, where caution should be exerted and where fluoride-free solutions provide an advantage over fluoride-containing solutions.
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Affiliation(s)
- Markus Rapedius
- Nanion Technologies GmbH, Munich, Germany
- *Correspondence: Markus Rapedius,
| | | | | | | | | | | | | | | | | | | | | | - Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Göttingen, Germany
- German Center for Cardiovascular Research, Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells”, University of Göttingen, Göttingen, Germany
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Göttingen, Germany
- German Center for Cardiovascular Research, Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells”, University of Göttingen, Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Göttingen, Germany
- German Center for Cardiovascular Research, Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells”, University of Göttingen, Göttingen, Germany
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16
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Rosholm KR, Badone B, Karatsiompani S, Nagy D, Seibertz F, Voigt N, Bell DC. Adventures and Advances in Time Travel With Induced Pluripotent Stem Cells and Automated Patch Clamp. Front Mol Neurosci 2022; 15:898717. [PMID: 35813069 PMCID: PMC9258620 DOI: 10.3389/fnmol.2022.898717] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [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: 03/17/2022] [Accepted: 05/13/2022] [Indexed: 01/21/2023] Open
Abstract
In the Hollywood blockbuster “The Curious Case of Benjamin Button” a fantastical fable unfolds of a man’s life that travels through time reversing the aging process; as the tale progresses, the frail old man becomes a vigorous, vivacious young man, then man becomes boy and boy becomes baby. The reality of cellular time travel, however, is far more wondrous: we now have the ability to both reverse and then forward time on mature cells. Four proteins were found to rewind the molecular clock of adult cells back to their embryonic, “blank canvas” pluripotent stem cell state, allowing these pluripotent stem cells to then be differentiated to fast forward their molecular clocks to the desired adult specialist cell types. These four proteins – the “Yamanaka factors” – form critical elements of this cellular time travel, which deservedly won Shinya Yamanaka the Nobel Prize for his lab’s work discovering them. Human induced pluripotent stem cells (hiPSCs) hold much promise in our understanding of physiology and medicine. They encapsulate the signaling pathways of the desired cell types, such as cardiomyocytes or neurons, and thus act as model cells for defining the critical ion channel activity in healthy and disease states. Since hiPSCs can be derived from any patient, highly specific, personalized (or stratified) physiology, and/or pathophysiology can be defined, leading to exciting developments in personalized medicines and interventions. As such, hiPSC married with high throughput automated patch clamp (APC) ion channel recording platforms provide a foundation for significant physiological, medical and drug discovery advances. This review aims to summarize the current state of affairs of hiPSC and APC: the background and recent advances made; and the pros, cons and challenges of these technologies. Whilst the authors have yet to finalize a fully functional time traveling machine, they will endeavor to provide plausible future projections on where hiPSC and APC are likely to carry us. One future projection the authors are confident in making is the increasing necessity and adoption of these technologies in the discovery of the next blockbuster, this time a life-enhancing ion channel drug, not a fantastical movie.
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Affiliation(s)
- Kadla R. Rosholm
- Sophion Bioscience A/S, Ballerup, Denmark
- *Correspondence: Kadla R. Rosholm,
| | | | | | - David Nagy
- Sophion Bioscience Inc., Woburn, MA, United States
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
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17
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Jung P, Seibertz F, Fakuade FE, Mason F, Ebert A, Voigt N. PO-705-05 CALCIUM HANDLING ABNORMALITIES CONTRIBUTE TO ARRHYTHMOGENESIS IN DILATED CARDIOMYOPATHY. Heart Rhythm 2022. [DOI: 10.1016/j.hrthm.2022.03.1076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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18
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Pronto JR, Mason FE, Kohlhaas M, Fakuade FEE, Maack C, Voigt N. BS-526-04 IMPAIRED REDOX RESPONSE TO INCREASED WORKLOAD IN ATRIAL MITOCHONDRIA FROM PATIENTS WITH ATRIAL FIBRILLATION. Heart Rhythm 2022. [DOI: 10.1016/j.hrthm.2022.03.718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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19
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Fakuade FE, Fauconnier J, Voigt N. Background calcium influx in arrhythmia: lead actor or extra? J Physiol 2022; 600:2545-2546. [PMID: 35451079 DOI: 10.1113/jp283032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
| | - Jeremy Fauconnier
- PhyMedExp, INSERM, CNRS, Université de Montpellier, Montpellier, France
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
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20
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Peris-Yagüe V, Rubio T, Fakuade FE, Voigt N, Luther S, Majumder R. A Mathematical Model for Electrical Activity in Pig Atrial Tissue. Front Physiol 2022; 13:812535. [PMID: 35360247 PMCID: PMC8960738 DOI: 10.3389/fphys.2022.812535] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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] [Received: 11/10/2021] [Accepted: 01/28/2022] [Indexed: 11/21/2022] Open
Abstract
State of the art mathematical models are currently used to bridge the gap between basic research conducted in the laboratory and preclinical research conducted on large animals, which ultimately paves the way for clinical translation. In this regard, there is a great need for models that can be used alongside experiments for in-depth investigation and validation. One such experimental model is the porcine atrium, which is commonly used to study the mechanisms of onset and control of atrial fibrillation in the context of its surgical management. However, a mathematical model of pig atria is lacking. In this paper, we present the first ionically detailed mathematical model of porcine atrial electrophysiology, at body temperature. The model includes 12 ionic currents, 4 of which were designed based on experimental patch-clamp data directly obtained from literature. The formulations for the other currents are adopted from the human atrial model, and modified for porcine specificity based on our measured restitution data for different action potential characteristics: resting membrane potential, action potential amplitude, maximum upstroke velocity and action potential duration and different levels of membrane voltage repolarization. The intracellular Ca2+ dynamics follows the Luo-Rudy formulation for guinea pig ventricular cardiomyocytes. The resulting model represents “normal” cells which are formulated as a system of ordinary differential equations. We extend our model to two dimensions to obtain plane wave propagation in tissue with a velocity of 0.58 m/s and a wavelength of 8 cm. The wavelength reduces to 5 cm when the tissue is paced at 200 ms. Using S1-S2 cross-field protocol, we demonstrate in an 11.26 cm square simulation domain, the ability to initiate single spiral waves (rotation period ≃ 180 ms) that remain stable for more than 40 s. The spiral tip exhibits hypermeander. In agreement with previous experimental results using pig atria, our model shows that early repolarization is primarily driven by a calcium-mediated chloride current, IClCa, which is completely inactivated at high pacing frequencies. This is a condition that occurs only in porcine atria. Furthermore, the model shows spatiotemporal chaos with reduced repolarization.
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Affiliation(s)
- Víctor Peris-Yagüe
- Biomedical Physics Group, Max Planck Institute for Dynamics and Self Organisation, Gottingen, Germany
- Centre de Formaćio Interdisciplinària Superior (CFIS), Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Tony Rubio
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Gottingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Gottingen, Germany
| | - Funsho E. Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Gottingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Gottingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells” (MBExC), Georg-August University, Gottingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Gottingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Gottingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells” (MBExC), Georg-August University, Gottingen, Germany
| | - Stefan Luther
- Biomedical Physics Group, Max Planck Institute for Dynamics and Self Organisation, Gottingen, Germany
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Gottingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Gottingen, Germany
| | - Rupamanjari Majumder
- Biomedical Physics Group, Max Planck Institute for Dynamics and Self Organisation, Gottingen, Germany
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Gottingen, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Gottingen, Germany
- *Correspondence: Rupamanjari Majumder
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21
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del Campo CV, Liaw NY, Gunadasa-Rohling M, Matthaei M, Braga L, Kennedy T, Salinas G, Voigt N, Giacca M, Zimmermann WH, Riley PR. Regenerative potential of epicardium-derived extracellular vesicles mediated by conserved miRNA transfer. Cardiovasc Res 2022; 118:597-611. [PMID: 33599250 PMCID: PMC8803084 DOI: 10.1093/cvr/cvab054] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [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: 02/20/2020] [Accepted: 02/12/2021] [Indexed: 12/19/2022] Open
Abstract
AIMS After a myocardial infarction, the adult human heart lacks sufficient regenerative capacity to restore lost tissue, leading to heart failure progression. Finding novel ways to reprogram adult cardiomyocytes into a regenerative state is a major therapeutic goal. The epicardium, the outermost layer of the heart, contributes cardiovascular cell types to the forming heart and is a source of trophic signals to promote heart muscle growth during embryonic development. The epicardium is also essential for heart regeneration in zebrafish and neonatal mice and can be reactivated after injury in adult hearts to improve outcome. A recently identified mechanism of cell-cell communication and signalling is that mediated by extracellular vesicles (EVs). Here, we aimed to investigate epicardial signalling via EV release in response to cardiac injury and as a means to optimize cardiac repair and regeneration. METHODS AND RESULTS We isolated epicardial EVs from mouse and human sources and targeted the cardiomyocyte population. Epicardial EVs enhanced proliferation in H9C2 cells and in primary neonatal murine cardiomyocytes in vitro and promoted cell cycle re-entry when injected into the injured area of infarcted neonatal hearts. These EVs also enhanced regeneration in cryoinjured engineered human myocardium (EHM) as a novel model of human myocardial injury. Deep RNA-sequencing of epicardial EV cargo revealed conserved microRNAs (miRs) between human and mouse epicardial-derived exosomes, and the effects on cell cycle re-entry were recapitulated by administration of cargo miR-30a, miR-100, miR-27a, and miR-30e to human stem cell-derived cardiomyocytes and cryoinjured EHM constructs. CONCLUSION Here, we describe the first characterization of epicardial EV secretion, which can signal to promote proliferation of cardiomyocytes in infarcted mouse hearts and in a human model of myocardial injury, resulting in enhanced contractile function. Analysis of exosome cargo in mouse and human identified conserved pro-regenerative miRs, which in combination recapitulated the therapeutic effects of promoting cardiomyocyte proliferation.
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Affiliation(s)
- Cristina Villa del Campo
- Department of Physiology, Anatomy and Genetics, British Heart Foundation, Oxbridge Centre of Regenerative Medicine, University of Oxford, Sherrington Building, Sherrington Rd, Oxford OX1 3PT, UK
| | - Norman Y Liaw
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Robert-Koch-Straße 42a, 37075 Göttingen, Germany
| | - Mala Gunadasa-Rohling
- Department of Physiology, Anatomy and Genetics, British Heart Foundation, Oxbridge Centre of Regenerative Medicine, University of Oxford, Sherrington Building, Sherrington Rd, Oxford OX1 3PT, UK
| | - Moritz Matthaei
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Luca Braga
- Molecular Medicine Laboratory, International Centre for Genetic Engineering and Biotechnology (ICGEB), Località Padriciano, 99, 34149 Trieste TS, Italy
- School of Cardiovascular Medicine & Sciences, British Heart Foundation Centre, King's College London, Strand, London WC2R 2L, UK
| | - Tahnee Kennedy
- Department of Physiology, Anatomy and Genetics, British Heart Foundation, Oxbridge Centre of Regenerative Medicine, University of Oxford, Sherrington Building, Sherrington Rd, Oxford OX1 3PT, UK
| | - Gabriela Salinas
- NGS- Integrative Genomics Core Unit (NIG), Institute of Human Genetics, University Medical Centre Göttingen (UMG), Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Robert-Koch-Straße 42a, 37075 Göttingen, Germany
| | - Mauro Giacca
- Molecular Medicine Laboratory, International Centre for Genetic Engineering and Biotechnology (ICGEB), Località Padriciano, 99, 34149 Trieste TS, Italy
- School of Cardiovascular Medicine & Sciences, British Heart Foundation Centre, King's College London, Strand, London WC2R 2L, UK
| | - Wolfram-Hubertus Zimmermann
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Robert-Koch-Straße 42a, 37075 Göttingen, Germany
| | - Paul Richard Riley
- Department of Physiology, Anatomy and Genetics, British Heart Foundation, Oxbridge Centre of Regenerative Medicine, University of Oxford, Sherrington Building, Sherrington Rd, Oxford OX1 3PT, UK
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22
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Brandenburg S, Pawlowitz J, Steckmeister V, Subramanian H, Uhlenkamp D, Scardigli M, Mushtaq M, Amlaz SI, Kohl T, Wegener JW, Arvanitis DA, Sanoudou D, Sacconi L, Hasenfuss G, Voigt N, Nikolaev VO, Lehnart SE. A junctional cAMP compartment regulates rapid Ca 2+ signaling in atrial myocytes. J Mol Cell Cardiol 2022; 165:141-157. [PMID: 35033544 DOI: 10.1016/j.yjmcc.2022.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 12/15/2021] [Accepted: 01/08/2022] [Indexed: 10/19/2022]
Abstract
Axial tubule junctions with the sarcoplasmic reticulum control the rapid intracellular Ca2+-induced Ca2+ release that initiates atrial contraction. In atrial myocytes we previously identified a constitutively increased ryanodine receptor (RyR2) phosphorylation at junctional Ca2+ release sites, whereas non-junctional RyR2 clusters were phosphorylated acutely following β-adrenergic stimulation. Here, we hypothesized that the baseline synthesis of 3',5'-cyclic adenosine monophosphate (cAMP) is constitutively augmented in the axial tubule junctional compartments of atrial myocytes. Confocal immunofluorescence imaging of atrial myocytes revealed that junctin, binding to RyR2 in the sarcoplasmic reticulum, was densely clustered at axial tubule junctions. Interestingly, a new transgenic junctin-targeted FRET cAMP biosensor was exclusively co-clustered in the junctional compartment, and hence allowed to monitor cAMP selectively in the vicinity of junctional RyR2 channels. To dissect local cAMP levels at axial tubule junctions versus subsurface Ca2+ release sites, we developed a confocal FRET imaging technique for living atrial myocytes. A constitutively high adenylyl cyclase activity sustained increased local cAMP levels at axial tubule junctions, whereas β-adrenergic stimulation overcame this cAMP compartmentation resulting in additional phosphorylation of non-junctional RyR2 clusters. Adenylyl cyclase inhibition, however, abolished the junctional RyR2 phosphorylation and decreased L-type Ca2+ channel currents, while FRET imaging showed a rapid cAMP decrease. In conclusion, FRET biosensor imaging identified compartmentalized, constitutively augmented cAMP levels in junctional dyads, driving both the locally increased phosphorylation of RyR2 clusters and larger L-type Ca2+ current density in atrial myocytes. This cell-specific cAMP nanodomain is maintained by a constitutively increased adenylyl cyclase activity, contributing to the rapid junctional Ca2+-induced Ca2+ release, whereas β-adrenergic stimulation overcomes the junctional cAMP compartmentation through cell-wide activation of non-junctional RyR2 clusters.
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Affiliation(s)
- Sören Brandenburg
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany; DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany.
| | - Jan Pawlowitz
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Vanessa Steckmeister
- Heart Research Center Göttingen, Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
| | - Hariharan Subramanian
- Institute of Experimental Cardiovascular Research, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Dennis Uhlenkamp
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Marina Scardigli
- Department of Physics and Astronomy, University of Florence, Florence, Italy; European Laboratory for Non-Linear Spectroscopy and National Institute of Optics (INO-CNR), Sesto Fiorentino, Italy
| | - Mufassra Mushtaq
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Saskia I Amlaz
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
| | - Tobias Kohl
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
| | - Jörg W Wegener
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
| | - Demetrios A Arvanitis
- Molecular Biology Division, Biomedical Research Foundation, Academy of Athens, Athens, Greece
| | - Despina Sanoudou
- Molecular Biology Division, Biomedical Research Foundation, Academy of Athens, Athens, Greece
| | - Leonardo Sacconi
- European Laboratory for Non-Linear Spectroscopy and National Institute of Optics (INO-CNR), Sesto Fiorentino, Italy; Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, Germany
| | - Gerd Hasenfuss
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany; DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
| | - Niels Voigt
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany; Heart Research Center Göttingen, Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
| | - Viacheslav O Nikolaev
- Institute of Experimental Cardiovascular Research, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany; DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Germany
| | - Stephan E Lehnart
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany; DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany; BioMET, Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, MD, USA
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23
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Hofhuis J, Bersch K, Wagner S, Molina C, Fakuade FE, Iyer LM, Streckfuss-Bömeke K, Toischer K, Zelarayán LC, Voigt N, Nikolaev VO, Maier LS, Klinge L, Thoms S. Dysferlin links excitation-contraction coupling to structure and maintenance of the cardiac transverse-axial tubule system. Europace 2021; 22:1119-1131. [PMID: 32572487 DOI: 10.1093/europace/euaa093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 10/23/2019] [Revised: 01/27/2020] [Accepted: 04/03/2020] [Indexed: 12/24/2022] Open
Abstract
AIMS The multi-C2 domain protein dysferlin localizes to the T-Tubule system of skeletal and heart muscles. In skeletal muscle, dysferlin is known to play a role in membrane repair and in T-tubule biogenesis and maintenance. Dysferlin deficiency manifests as muscular dystrophy of proximal and distal muscles. Cardiomyopathies have been also reported, and some dysferlinopathy mouse models develop cardiac dysfunction under stress. Generally, the role and functional relevance of dysferlin in the heart is not clear. The aim of this study was to analyse the effect of dysferlin deficiency on the transverse-axial tubule system (TATS) structure and on Ca2+ homeostasis in the heart. METHODS AND RESULTS We studied dysferlin localization in rat and mouse cardiomyocytes by immunofluorescence microscopy. In dysferlin-deficient ventricular mouse cardiomyocytes, we analysed the TATS by live staining and assessed Ca2+ handling by patch-clamp experiments and measurement of Ca2+ transients and Ca2+ sparks. We found increasing co-localization of dysferlin with the L-type Ca2+-channel during TATS development and show that dysferlin deficiency leads to pathological loss of transversal and increase in longitudinal elements (axialization). We detected reduced L-type Ca2+-current (ICa,L) in cardiomyocytes from dysferlin-deficient mice and increased frequency of spontaneous sarcoplasmic reticulum Ca2+ release events resulting in pro-arrhythmic contractions. Moreover, cardiomyocytes from dysferlin-deficient mice showed an impaired response to β-adrenergic receptor stimulation. CONCLUSIONS Dysferlin is required for TATS biogenesis and maintenance in the heart by controlling the ratio of transversal and axial membrane elements. Absence of dysferlin leads to defects in Ca2+ homeostasis which may contribute to contractile heart dysfunction in dysferlinopathy patients.
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Affiliation(s)
- Julia Hofhuis
- Department of Child and Adolescent Health, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany
| | - Kristina Bersch
- Department of Child and Adolescent Health, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Stefan Wagner
- Department of Cardiology, University Hospital Regensburg, Regensburg, Germany
| | - Cristina Molina
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany.,Institute for Experimental Cardiology, University Medical Center Hamburg, Hamburg, Germany
| | - Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
| | - Lavanya M Iyer
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany.,Computational and Systems Biology, Genome Institute of Singapore, Singapore, Singapore
| | - Katrin Streckfuss-Bömeke
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Department of Cardiology and Pneumonology, University Medical Center Göttingen, Göttingen, Germany
| | - Karl Toischer
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Department of Cardiology and Pneumonology, University Medical Center Göttingen, Göttingen, Germany
| | - Laura C Zelarayán
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
| | - Niels Voigt
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
| | - Viacheslav O Nikolaev
- DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany.,Institute for Experimental Cardiology, University Medical Center Hamburg, Hamburg, Germany
| | - Lars S Maier
- Department of Cardiology, University Hospital Regensburg, Regensburg, Germany
| | - Lars Klinge
- Department of Child and Adolescent Health, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,Kinderarztpraxis Göttingen, Göttingen, Germany
| | - Sven Thoms
- Department of Child and Adolescent Health, University Medical Center Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Sites Göttingen and Hamburg, Germany
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24
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Affiliation(s)
- Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center, Robert-Koch-Str. 40, D-37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Philipp Tomsits
- Department of Medicine I, University Hospital Munich, Campus Großhadern, Ludwig-Maximilians University (LMU), Marchioninistraße 15, 81377 Munich, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Munich, Munich Heart Alliance (MHA), Germany.,Walter Brendel Center of Experimental Medicine, Ludwig-Maximilians University (LMU), Marchioninistraße 27, 81377 Munich, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center, Robert-Koch-Str. 40, D-37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany
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25
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Kyryachenko S, Georges A, Yu M, Barrandou T, Guo L, Bruneval P, Rubio T, Gronwald J, Baraki H, Kutschka I, Aras KK, Efimov IR, Norris RA, Voigt N, Bouatia-Naji N. Chromatin Accessibility of Human Mitral Valves and Functional Assessment of MVP Risk Loci. Circ Res 2021; 128:e84-e101. [PMID: 33508947 PMCID: PMC8316483 DOI: 10.1161/circresaha.120.317581] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
RATIONALE Mitral valve prolapse (MVP) is a common valvopathy that leads to mitral insufficiency, heart failure, and sudden death. Functional genomic studies in mitral valves are needed to better characterize MVP-associated variants and target genes. OBJECTIVE To establish the chromatin accessibility profiles and assess functionality of variants and narrow down target genes at MVP loci. METHODS AND RESULTS We mapped the open chromatin regions in nuclei from 11 human pathogenic and 7 nonpathogenic mitral valves by an assay for transposase-accessible chromatin with high-throughput sequencing. Open chromatin peaks were globally similar between pathogenic and nonpathogenic valves. Compared with the heart tissue and cardiac fibroblasts, we found that MV-specific assay for transposase-accessible chromatin with high-throughput sequencing peaks are enriched near genes involved in extracellular matrix organization, chondrocyte differentiation, and connective tissue development. One of the most enriched motifs in MV-specific open chromatin peaks was for the nuclear factor of activated T cells family of TFs (transcription factors) involved in valve endocardial and interstitial cell formation. We also found that MVP-associated variants were significantly enriched (P<0.05) in mitral valve open chromatin peaks. Integration of the assay for transposase-accessible chromatin with high-throughput sequencing data with risk loci, extensive functional annotation, and gene reporter assay suggest plausible causal variants for rs2641440 at the SMG6/SRR locus and rs6723013 at the IGFBP2/IGFBP5/TNS1 locus. CRISPR-Cas9 deletion of the sequence including rs6723013 in human fibroblasts correlated with increased expression only for TNS1. Circular chromatin conformation capture followed by high-throughput sequencing experiments provided evidence for several target genes, including SRR, HIC1, and DPH1 at the SMG6/SRR locus and further supported TNS1 as the most likely target gene on chromosome 2. CONCLUSIONS Here, we describe unprecedented genome-wide open chromatin profiles from human pathogenic and nonpathogenic MVs and report specific gene regulation profiles, compared with the heart. We also report in vitro functional evidence for potential causal variants and target genes at MVP risk loci involving established and new biological mechanisms. Graphic Abstract: A graphic abstract is available for this article.
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Affiliation(s)
| | | | - Mengyao Yu
- Université de Paris, PARCC, Inserm, Paris,
France
| | | | - Lilong Guo
- Department of Regenerative Medicine and Cell Biology,
Medical University of South Carolina, Charleston, SC, USA
- Department of Medicine, Medical University of South
Carolina, Charleston, SC, USA
| | | | - Tony Rubio
- Institute of Pharmacology and Toxicology, University
Medical Center Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner
Site Göttingen, Germany
| | - Judith Gronwald
- Institute of Pharmacology and Toxicology, University
Medical Center Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner
Site Göttingen, Germany
| | - Hassina Baraki
- DZHK (German Center for Cardiovascular Research), Partner
Site Göttingen, Germany
- Department of Thoracic and Cardiovascular Surgery,
University Medical Center, Göttingen, Germany
| | - Ingo Kutschka
- DZHK (German Center for Cardiovascular Research), Partner
Site Göttingen, Germany
- Department of Thoracic and Cardiovascular Surgery,
University Medical Center, Göttingen, Germany
| | - Kedar K. Aras
- Department of Biomedical Engineering, George Washington
University, Washington, DC, USA
| | - Igor R. Efimov
- Department of Biomedical Engineering, George Washington
University, Washington, DC, USA
| | - Russel A. Norris
- Department of Regenerative Medicine and Cell Biology,
Medical University of South Carolina, Charleston, SC, USA
- Department of Medicine, Medical University of South
Carolina, Charleston, SC, USA
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University
Medical Center Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner
Site Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from
Molecular Machines to Networks of Excitable Cells (MBExC), University of
Göttingen, Germany
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26
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Peper J, Kownatzki-Danger D, Weninger G, Seibertz F, Pronto JRD, Sutanto H, Pacheu-Grau D, Hindmarsh R, Brandenburg S, Kohl T, Hasenfuss G, Gotthardt M, Rog-Zielinska EA, Wollnik B, Rehling P, Urlaub H, Wegener J, Heijman J, Voigt N, Cyganek L, Lenz C, Lehnart SE. Caveolin3 Stabilizes McT1-Mediated Lactate/Proton Transport in Cardiomyocytes. Circ Res 2021; 128:e102-e120. [PMID: 33486968 DOI: 10.1161/circresaha.119.316547] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Jonas Peper
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Daniel Kownatzki-Danger
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Gunnar Weninger
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology (F.S., J.R.D.P., N.V.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology (F.S., J.R.D.P., N.V.), University Medical Center Göttingen
| | - Henry Sutanto
- Cardiology, Cardiovascular Research Institute Maastricht, Maastricht University (H.S., J.H.)
| | - David Pacheu-Grau
- Cellular Biochemistry, University Medical Center, Georg-August-University (D.P.G., P.R.)
| | - Robin Hindmarsh
- Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Sören Brandenburg
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Tobias Kohl
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Gerd Hasenfuss
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Michael Gotthardt
- Neuromuscular and Cardiovascular Cell Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin (M.G.).,Cardiology, Virchow Klinikum, Charité-University Medicine, Berlin (M.G.).,DZHK (German Center for Cardiovascular Research), partner site Berlin (M.G.)
| | - Eva A Rog-Zielinska
- University Heart Center, Faculty of Medicine, University of Freiburg (E.A.R.-Z.)
| | - Bernd Wollnik
- Institute of Human Genetics (B.W.), University Medical Center Göttingen.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Peter Rehling
- Cellular Biochemistry, University Medical Center, Georg-August-University (D.P.G., P.R.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Henning Urlaub
- Bioanalytics, Institute of Clinical Chemistry (H.U., C.L.), University Medical Center Göttingen.,Bioanalytical Mass Spectrometry, Max Planck Institute for Biophysical Chemistry, Göttingen (H.U., C.L.)
| | - Jörg Wegener
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Jordi Heijman
- Cardiology, Cardiovascular Research Institute Maastricht, Maastricht University (H.S., J.H.)
| | - Niels Voigt
- Institute of Pharmacology and Toxicology (F.S., J.R.D.P., N.V.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Lukas Cyganek
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Christof Lenz
- Bioanalytics, Institute of Clinical Chemistry (H.U., C.L.), University Medical Center Göttingen.,Bioanalytical Mass Spectrometry, Max Planck Institute for Biophysical Chemistry, Göttingen (H.U., C.L.)
| | - Stephan E Lehnart
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.).,BioMET, Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore (S.E.L.)
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Kleemann K, Haghighi F, Pietras J, Habich L, Dahlmann J, Rubio T, Seibertz F, Skvorc D, Nourmohammadi S, Volleth M, Voigt N, Zenker M, Kutschka I, Kensah G. Noonan Syndrome-Associated Hypertrophic Cardiomyopathy Caused by a Mutation in RIT1 Can Be Partially Rescued by Inhibition of RAS/MAPK Signaling Pathway In Vitro. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725644] [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: 10/21/2022]
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28
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Pietras J, Skvorc D, Haghighi F, Seibertz F, Waldmann-Beushausen R, Habich L, Nourmohammadi S, Fietz R, Bähr R, Voigt N, Kutschka I, Kensah G. Generation and Maturation of Human IPSC-Derived Myocardium in a Closed and Automated Bioreactor System. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725703] [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: 10/21/2022]
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29
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Trosclair K, Si M, Watts M, Gautier NM, Voigt N, Traylor J, Bitay M, Baczko I, Dobrev D, Hamilton KA, Bhuiyan MS, Dominic P, Glasscock E. Kv1.1 potassium channel subunit deficiency alters ventricular arrhythmia susceptibility, contractility, and repolarization. Physiol Rep 2021; 9:e14702. [PMID: 33427415 PMCID: PMC7798052 DOI: 10.14814/phy2.14702] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 12/11/2022] Open
Abstract
Epilepsy-associated Kv1.1 voltage-gated potassium channel subunits encoded by the Kcna1 gene have traditionally been considered absent in heart, but recent studies reveal they are expressed in cardiomyocytes where they could regulate intrinsic cardiac electrophysiology. Although Kv1.1 now has a demonstrated functional role in atria, its role in the ventricles has never been investigated. In this work, electrophysiological, histological, and gene expression approaches were used to explore the consequences of Kv1.1 deficiency in the ventricles of Kcna1 knockout (KO) mice at the organ, cellular, and molecular levels to determine whether the absence of Kv1.1 leads to ventricular dysfunction that increases the risk of premature or sudden death. When subjected to intracardiac pacing, KO mice showed normal baseline susceptibility to inducible ventricular arrhythmias (VA) but resistance to VA under conditions of sympathetic challenge with isoproterenol. Echocardiography revealed cardiac contractile dysfunction manifesting as decreased ejection fraction and fractional shortening. In whole-cell patch-clamp recordings, KO ventricular cardiomyocytes exhibited action potential prolongation indicative of impaired repolarization. Imaging, histological, and transcript analyses showed no evidence of structural or channel gene expression remodeling, suggesting that the observed deficits are likely electrogenic due to Kv1.1 deficiency. Immunoblots of patient heart samples detected the presence of Kv1.1 at relatively high levels, implying that Kv1.1 contributes to human cardiac electrophysiology. Taken together, this work describes an important functional role for Kv1.1 in ventricles where its absence causes repolarization and contractility deficits but reduced susceptibility to arrhythmia under conditions of sympathetic drive.
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Affiliation(s)
- Krystle Trosclair
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Man Si
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Megan Watts
- Department of Internal MedicineSection of CardiologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Nicole M. Gautier
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Niels Voigt
- Institute of Pharmacology and ToxicologyUniversity Medical Center GoettingenGoettingenGermany
- DZHK (German Center for Cardiovascular Research)GöttingenGermany
| | - James Traylor
- Department of PathologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Miklós Bitay
- Department of Cardiac Surgery2nd Department of Medicine and Cardiology CenterUniversity of SzegedSzegedHungary
| | - Istvan Baczko
- Department of Pharmacology and PharmacotherapyInterdisciplinary Excellence CentreUniversity of SzegedSzegedHungary
| | - Dobromir Dobrev
- Institute of PharmacologyWest German Heart and Vascular CenterUniversity Duisburg‐EssenEssenGermany
| | - Kathryn A. Hamilton
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Md. Shenuarin Bhuiyan
- Department of PathologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Paari Dominic
- Department of Internal MedicineSection of CardiologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Edward Glasscock
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
- Department of Biological SciencesSouthern Methodist UniversityDallasTXUSA
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30
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Haghighi F, Liutkute A, Kleemann K, Habich L, Pietras J, Skvorc D, Nourmohammadi S, Dahlmann J, Seibertz F, Rubio T, Voigt N, Lebert J, Christoph J, Cyganek L, Kutschka I, Zenker M, Kensah G. Cardiac Electrophysiological Anomalies Associated with A Noonan Syndrome Mutation in RAF1 Can Be Rescued Partially In Vitro by Inhibition of RAS/MAPK Signaling Pathway. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725806] [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: 10/21/2022]
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31
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Seibertz F, Reynolds M, Voigt N. Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes. J Vis Exp 2020. [PMID: 33427238 DOI: 10.3791/61890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Conventional intracellular microelectrode techniques to quantify cardiomyocyte electrophysiology are extremely complex, labor intensive, and typically carried out in low throughput. Rapid and ongoing expansion of induced pluripotent stem cell (iPSC) technology presents a new standard in cardiovascular research and alternate methods are now necessary to increase throughput of electrophysiological data at a single cell level. VF2.1Cl is a recently derived voltage sensitive dye which provides a rapid single channel, high magnitude response to fluctuations in membrane potential. It possesses kinetics superior to those of other existing voltage indicators and makes available functional data equivalent to that of traditional microelectrode techniques. Here, we demonstrate simplified, non-invasive action potential characterization in externally paced human iPSC derived cardiomyocytes using a modular and highly affordable photometry system.
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Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, Goettingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Goettingen, Germany
| | | | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, Goettingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Goettingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Goettingen, Germany;
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32
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Abstract
The molecular mechanisms underlying atrial fibrillation (AF), the most common form of arrhythmia, are poorly understood and therefore target-specific treatment options remain an unmet clinical need. Excitation–contraction coupling in cardiac myocytes requires high amounts of adenosine triphosphate (ATP), which is replenished by oxidative phosphorylation in mitochondria. Calcium (Ca2+) is a key regulator of mitochondrial function by stimulating the Krebs cycle, which produces nicotinamide adenine dinucleotide for ATP production at the electron transport chain and nicotinamide adenine dinucleotide phosphate for the elimination of reactive oxygen species (ROS). While it is now well established that mitochondrial dysfunction plays an important role in the pathophysiology of heart failure, this has been less investigated in atrial myocytes in AF. Considering the high prevalence of AF, investigating the role of mitochondria in this disease may guide the path towards new therapeutic targets. In this review, we discuss the importance of mitochondrial Ca2+ handling in regulating ATP production and mitochondrial ROS emission and how alterations, particularly in these aspects of mitochondrial activity, may play a role in AF. In addition to describing research advances, we highlight areas in which further studies are required to elucidate the role of mitochondria in AF.
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Affiliation(s)
- Fleur E Mason
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Khaled Alhussini
- Department of Thoracic and Cardiovascular Surgery, University Clinic Würzburg, Würzburg, Germany
| | - Christoph Maack
- Department of Translational Research, Comprehensive Heart Failure Center Würzburg, University Clinic Würzburg, Am Schwarzenberg 15, 97078, Würzburg, Germany. .,Department of Internal Medicine I, University Clinic Würzburg, Am Schwarzenberg 15, 97078, Würzburg, Germany.
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany. .,DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany. .,Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany.
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33
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Tomsits P, Schüttler D, Kääb S, Clauss S, Voigt N. Isolation of High Quality Murine Atrial and Ventricular Myocytes for Simultaneous Measurements of Ca2+ Transients and L-Type Calcium Current. J Vis Exp 2020. [PMID: 33226029 DOI: 10.3791/61964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Mouse models play a crucial role in arrhythmia research and allow studying key mechanisms of arrhythmogenesis including altered ion channel function and calcium handling. For this purpose, atrial or ventricular cardiomyocytes of high quality are necessary to perform patch-clamp measurements or to explore calcium handling abnormalities. However, the limited yield of high-quality cardiomyocytes obtained by current isolation protocols does not allow both measurements in the same mouse. This article describes a method to isolate high-quality murine atrial and ventricular myocytes via retrograde enzyme-based Langendorff perfusion, for subsequent simultaneous measurements of calcium transients and L-type calcium current from one animal. Mouse hearts are obtained, and the aorta is rapidly cannulated to remove blood. Hearts are then initially perfused with a calcium-free solution (37 °C) to dissociate the tissue at the level of intercalated discs and afterwards with an enzyme solution containing little calcium to disrupt extracellular matrix (37 °C). The digested heart is subsequently dissected into atria and ventricles. Tissue samples are chopped into small pieces and dissolved by carefully pipetting up and down. The enzymatic digestion is stopped, and cells are stepwise reintroduced to physiologic calcium concentrations. After loading with a fluorescent Ca2+-indicator, isolated cardiomyocytes are prepared for simultaneous measurement of calcium currents and transients. Additionally, isolation pitfalls are discussed and patch-clamp protocols and representative traces of L-type calcium currents with simultaneous calcium transient measurements in atrial and ventricular murine myocytes isolated as described above are provided.
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Affiliation(s)
- Philipp Tomsits
- Department of Medicine I, University Hospital Munich, Campus Großhadern, Ludwig-Maximilians University Munich (LMU); Partner Site Munich, Munich Heart Alliance (MHA), DZHK (German Centre for Cardiovascular Research); Walter Brendel Center of Experimental Medicine, Ludwig-Maximilians University Munich (LMU);
| | - Dominik Schüttler
- Department of Medicine I, University Hospital Munich, Campus Großhadern, Ludwig-Maximilians University Munich (LMU); Partner Site Munich, Munich Heart Alliance (MHA), DZHK (German Centre for Cardiovascular Research); Walter Brendel Center of Experimental Medicine, Ludwig-Maximilians University Munich (LMU)
| | - Stefan Kääb
- Department of Medicine I, University Hospital Munich, Campus Großhadern, Ludwig-Maximilians University Munich (LMU); Partner Site Munich, Munich Heart Alliance (MHA), DZHK (German Centre for Cardiovascular Research)
| | - Sebastian Clauss
- Department of Medicine I, University Hospital Munich, Campus Großhadern, Ludwig-Maximilians University Munich (LMU); Partner Site Munich, Munich Heart Alliance (MHA), DZHK (German Centre for Cardiovascular Research); Walter Brendel Center of Experimental Medicine, Ludwig-Maximilians University Munich (LMU)
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen; Partner Site Göttingen, DZHK (German Centre for Cardiovascular Research); Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen
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34
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Treu F, Dybkova N, Jung P, Li Y, Huebscher D, Maurer W, Hasenfuss G, Voigt N, Sossalla S, Wollnik B, Streckfuss-Boemeke K. Genetic variants in calcium regulatory cardiac genes and their contribution to Takotsubo syndrome. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 11/14/2022] Open
Abstract
Abstract
Background and purpose
Takotsubo syndrome (TTS) is characterized by an acute left ventricular dysfunction similar to a myocardial infarction (MI) in the absence of coronary artery stenosis. Patients show symptoms similar to the acute MI with increased biomarkers and blood serum catecholamines. Recently, we developed a patient-specific TTS stem cell model and identified a higher sensitivity to catecholamine-induced stress. Furthermore, familial TTS cases and genetic studies point to a genetic predisposition. The purpose of this study was to analyze a genetic predisposition by characterizing genetic variants in genes associated with cardiac pathologies and their impact on calcium homoeostasis in TTS.
Methods and results
Whole exome sequencing analysis of a TTS patient discovered 2 missense AHNAK variants in its C-terminal domain and in addition the missense variant F189L in the calcium buffering calsequestrin 2 gene (CASQ2). AHNAK is a 700kDa big nucleoprotein and is involved in the β-adrenergic regulation of the cardiac calcium channel Cav1.2. 3-month old TTS-iPSC-derived cardiomyocytes (CM) were generated and the variants were confirmed by sequencing. We found AHNAK higher expressed in TTS-iPSC-CMs compared to control, whereas no expression alteration was observed for Cav1.2. Since AHNAK is described to act as a repressor towards Cav1.2, which is relieved under β-adrenergic stimulation, we analyzed the effect of AHNAK variants on a potential co-localization and interaction between both proteins. AHNAK and Cav1.2 were shown to co-localize in the cytoplasm as well as the membranes and co-immunoprecipitation experiments confirmed an interaction of AHNAK and Cav1.2 in all tested control- and TTS-iPSC-CMs. On a functional level, we were able to show by patch clamp analysis that Cav1.2 calcium currents are significantly increased in TTS-iPSC-CMs compared to control. The influence of CASQ2-F189L on sarcomeric reticulum (SR) calcium load was analyzed by epifluorescence microscopy using FURA4 and caffeine-applications. We found significantly decreased SR calcium content with an increased fractional release during systole in TTS-iPSC-CMs. To test, whether these variants are the main reason for altered interaction of AHNAK and Cav1.2, calcium currents or SR calcium load in TTS need to be proven in the future by using CRISPR/Cas9-rescued AHNAK/CASQ2 lines.
Conclusion
Here we show the cardiac functional consequences of AHNAK and CASQ2 missense mutations in TTS-iPSC-CMs with regard to calcium currents and SR calcium load. These results show that AHNAK and CASQ2 variants may predispose to TTS and enable a new therapeutic option for TTS.
Funding Acknowledgement
Type of funding source: Foundation. Main funding source(s): Else Kröner-Fresenius Foundation
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Affiliation(s)
- F Treu
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - N Dybkova
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - P Jung
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - Y Li
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - D Huebscher
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - W Maurer
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - G Hasenfuss
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - N Voigt
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - S Sossalla
- University hospital Regensburg, Regensburg, Germany
| | - B Wollnik
- University Medical Center of Gottingen (UMG), Goettingen, Germany
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Schmidt C, Voigt N. Insights into cardiovascular research in Göttingen and Heidelberg: a report by the ESC Scientists of Tomorrow. Cardiovasc Res 2020; 116:e162-e164. [PMID: 32754726 DOI: 10.1093/cvr/cvaa165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Constanze Schmidt
- Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, Heidelberg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert-Koch-Str. 40, D-37075 Georg-August University Göttingen, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
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36
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Reil JC, Reil GH, Kovács Á, Sequeira V, Waddingham MT, Lodi M, Herwig M, Ghaderi S, Kreusser MM, Papp Z, Voigt N, Dobrev D, Meyhöfer S, Langer HF, Maier LS, Linz D, Mügge A, Hohl M, Steendijk P, Hamdani N. CaMKII activity contributes to homeometric autoregulation of the heart: A novel mechanism for the Anrep effect. J Physiol 2020; 598:3129-3153. [PMID: 32394454 DOI: 10.1113/jp279607] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 05/04/2020] [Indexed: 01/14/2023] Open
Abstract
KEY POINTS The Anrep effect represents the alteration of left ventricular (LV) contractility to acutely enhanced afterload in a few seconds, thereby preserving stroke volume (SV) at constant preload. As a result of the missing preload stretch in our model, the Anrep effect differs from the slow force response and has a different mechanism. The Anrep effect demonstrated two different phases. First, the sudden increased afterload was momentary equilibrated by the enhanced LV contractility as a result of higher power strokes of strongly-bound myosin cross-bridges. Second, the slightly delayed recovery of SV is perhaps dependent on Ca2+ /calmodulin-dependent protein kinase II activation caused by oxidation and myofilament phosphorylation (cardiac myosin-binding protein-C, myosin light chain 2), maximizing the recruitment of available strongly-bound myosin cross-bridges. Short-lived oxidative stress might present a new facet of subcellular signalling with respect to cardiovascular regulation. Relevance for human physiology was demonstrated by echocardiography disclosing the Anrep effect in humans during handgrip exercise. ABSTRACT The present study investigated whether oxidative stress and Ca2+ /calmodulin-dependent protein kinase II (CaMKII) activity are involved in triggering the Anrep effect. LV pressure-volume (PV) analyses of isolated, preload controlled working hearts were performed at two afterload levels (60 and 100 mmHg) in C57BL/6N wild-type (WT) and CaMKII-double knockout mice (DKOCaMKII ). In snap-frozen WT hearts, force-pCa relationship, H2 O2 generation, CaMKII oxidation and phosphorylation of myofilament and Ca2+ handling proteins were assessed. Acutely raised afterload showed significantly increased wall stress, H2 O2 generation and LV contractility in the PV diagram with an initial decrease and recovery of stroke volume, whereas end-diastolic pressure and volume, as well as heart rate, remained constant. Afterload induced increase in LV contractility was blunted in DKOCaMKII -hearts. Force development of single WT cardiomyocytes was greater with elevated afterload at submaximal Ca2+ concentration and associated with increases in CaMKII oxidation and phosphorylation of cardiac-myosin binding protein-C, myosin light chain and Ca2+ handling proteins. CaMKII activity is involved in the regulation of the Anrep effect and associates with stimulation of oxidative stress, presumably starting a cascade of CaMKII oxidation with downstream phosphorylation of myofilament and Ca2+ handling proteins. These mechanisms improve LV inotropy and preserve stroke volume within few seconds.
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Affiliation(s)
- Jan-Christian Reil
- Klinik für Innere Medizin II, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitäres Herzzentrum Lübeck, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Gert-Hinrich Reil
- Klinik für Kardiologie, Klinikum Oldenburg, Innere Medizin I, Oldenburg, Germany
| | - Árpád Kovács
- Institute of Physiology, Ruhr University Bochum, Bochum, Germany.,Department of Cardiology, St. Josef-Hospital, Ruhr University of Bochum, Bochum, Germany.,Molecular and Experimental Cardiology, Ruhr Universität Bochum, Bochum, Germany
| | - Vasco Sequeira
- Comprehensive Heart Failure Center (CHFC), University Clinic Würzburg, Germany
| | - Mark T Waddingham
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands
| | - Maria Lodi
- Institute of Physiology, Ruhr University Bochum, Bochum, Germany.,Department of Cardiology, St. Josef-Hospital, Ruhr University of Bochum, Bochum, Germany.,Molecular and Experimental Cardiology, Ruhr Universität Bochum, Bochum, Germany
| | - Melissa Herwig
- Institute of Physiology, Ruhr University Bochum, Bochum, Germany.,Department of Cardiology, St. Josef-Hospital, Ruhr University of Bochum, Bochum, Germany.,Molecular and Experimental Cardiology, Ruhr Universität Bochum, Bochum, Germany
| | - Shahrooz Ghaderi
- Institute of Physiology, Ruhr University Bochum, Bochum, Germany
| | - Michael M Kreusser
- Departments of Cardiology, University of Heidelberg, Heidelberg, Germany
| | - Zoltán Papp
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Niels Voigt
- Institute of Pharmacology, West German Heart and Vascular Center, Faculty of Medicine, University Duisburg-Essen, Essen, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Dobromir Dobrev
- Institute of Pharmacology, West German Heart and Vascular Center, Faculty of Medicine, University Duisburg-Essen, Essen, Germany
| | - Svenja Meyhöfer
- Institute for Endocrinology & Diabetes, University of Lübeck, Lübeck, Germany and German Center for Diabetes Research, Neuherberg, Germany
| | - Harald F Langer
- Klinik für Innere Medizin II, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitäres Herzzentrum Lübeck, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Lars S Maier
- Klinik und Poliklinik für innere Medizin II, Universitätsklinikum Regensburg, Regensburg, Germany
| | - Dominik Linz
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Andreas Mügge
- Department of Cardiology, St. Josef-Hospital, Ruhr University of Bochum, Bochum, Germany.,Molecular and Experimental Cardiology, Ruhr Universität Bochum, Bochum, Germany
| | - Mathias Hohl
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Paul Steendijk
- Departments of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Nazha Hamdani
- Institute of Physiology, Ruhr University Bochum, Bochum, Germany.,Department of Cardiology, St. Josef-Hospital, Ruhr University of Bochum, Bochum, Germany.,Molecular and Experimental Cardiology, Ruhr Universität Bochum, Bochum, Germany.,Department Clinical Pharmacology, Ruhr University of Bochum, Bochum, Germany
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Fakuade FE, Steckmeister V, Seibertz F, Gronwald J, Kestel S, Menzel J, Pronto JRD, Taha K, Haghighi F, Kensah G, Pearman CM, Wiedmann F, Teske AJ, Schmidt C, Dibb KM, El-Essawi A, Danner BC, Baraki H, Schwappach B, Kutschka I, Mason FE, Voigt N. Altered atrial cytosolic calcium handling contributes to the development of postoperative atrial fibrillation. Cardiovasc Res 2020; 117:1790-1801. [PMID: 32520995 PMCID: PMC8208741 DOI: 10.1093/cvr/cvaa162] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [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: 01/30/2020] [Revised: 05/04/2020] [Accepted: 06/04/2020] [Indexed: 01/14/2023] Open
Abstract
Aims Atrial fibrillation (AF) is a commonly occurring arrhythmia after cardiac surgery (postoperative AF, poAF) and is associated with poorer outcomes. Considering that reduced atrial contractile function is a predictor of poAF and that Ca2+ plays an important role in both excitation–contraction coupling and atrial arrhythmogenesis, this study aims to test whether alterations of intracellular Ca2+ handling contribute to impaired atrial contractility and to the arrhythmogenic substrate predisposing patients to poAF. Methods and results Right atrial appendages were obtained from patients in sinus rhythm undergoing open-heart surgery. Cardiomyocytes were investigated by simultaneous measurement of [Ca2+]i and action potentials (APs, patch-clamp). Patients were followed-up for 6 days to identify those with and without poAF. Speckle-tracking analysis of preoperative echocardiography revealed reduced left atrial contraction strain in poAF patients. At the time of surgery, cellular Ca2+ transients (CaTs) and the sarcoplasmic reticulum (SR) Ca2+ content were smaller in the poAF group. CaT decay was slower in poAF, but the decay of caffeine-induced Ca2+ transients was unaltered, suggesting preserved sodium-calcium exchanger function. In agreement, western blots revealed reduced SERCA2a expression in poAF patients but unaltered phospholamban expression/phosphorylation. Computational modelling indicated that reduced SERCA activity promotes occurrence of CaT and AP alternans. Indeed, alternans of CaT and AP occurred more often and at lower stimulation frequencies in atrial myocytes from poAF patients. Resting membrane potential and AP duration were comparable between both groups at various pacing frequencies (0.25–8 Hz). Conclusions Biochemical, functional, and modelling data implicate reduced SERCA-mediated Ca2+ reuptake into the SR as a major contributor to impaired preoperative atrial contractile function and to the pre-existing arrhythmogenic substrate in patients developing poAF.
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Affiliation(s)
- Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Vanessa Steckmeister
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Judith Gronwald
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Stefanie Kestel
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Julia Menzel
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Molecular Biology, University Medical Centre, Humboldtallee 23, 37075 Göttingen, Germany
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Karim Taha
- Department of Cardiology, University Medical Centre, Heidelberglaan 100, 3508 GA Utrecht, The Netherlands.,Netherlands Heart Institute, Holland Heart House, Moreelsepark 1, 3511 EP Utrecht, The Netherlands
| | - Fereshteh Haghighi
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - George Kensah
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Charles M Pearman
- Unit of Cardiac Physiology, Division of Cardiovascular Sciences, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Felix Wiedmann
- Department of Cardiology, University Medical Center Heidelberg, Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Germany
| | - Arco J Teske
- Department of Cardiology, University Medical Centre, Heidelberglaan 100, 3508 GA Utrecht, The Netherlands
| | - Constanze Schmidt
- Department of Cardiology, University Medical Center Heidelberg, Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Germany
| | - Katharine M Dibb
- Unit of Cardiac Physiology, Division of Cardiovascular Sciences, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Aschraf El-Essawi
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, Klinikum Braunschweig, Braunschweig, Germany
| | - Bernhard C Danner
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Hassina Baraki
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Blanche Schwappach
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Molecular Biology, University Medical Centre, Humboldtallee 23, 37075 Göttingen, Germany
| | - Ingo Kutschka
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Fleur E Mason
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
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Hildebrandt L, Voigt N, Zimmermann T, Reese A, Proefrock D. Evaluation of continuous flow centrifugation as an alternative technique to sample microplastic from water bodies. Mar Environ Res 2019; 151:104768. [PMID: 31519451 DOI: 10.1016/j.marenvres.2019.104768] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/25/2019] [Accepted: 08/04/2019] [Indexed: 06/10/2023]
Abstract
The scientific and public interest regarding environmental pollution with microplastic has considerably increased within the last 15 years. Nevertheless, up to now there is no widely applied standard operation procedure for microplastic sampling, resulting in a lack of inter-study comparability. In addition, many studies on microplastic occurrences do not indicate a sound methodological validation of the applied methods and procedures. This study presents an alternative volume-reduced sampling technique to sample the entire load of suspended particulate matter including microplastic particles in natural waters, based on continuous flow centrifugation. For the lab-scale validation of the proposed instrumental setup, six different microplastic types (PE, PET, PS, PVDC, EPS and PP) were used. The particles covered a size range from 1 μm to 1 mm and a density range from 0.94 g mL-1 to 1.63 g mL-1. Recoveries ranged from 95.0% ± 2.3% - 99.1% ± 0.3% for virgin powders and from 96.1% ± 0.6% - 99.4% ± 0.2% (1 SD, n = 2 - 3) for microplastic suspended in river water for 40 days. Gravimetric and microscopic analysis of the effluent indicates efficient removal of microplastic from the suspensions. Static light scattering analysis of the microplastic suspensions prior to and after centrifugation confirmed that no change of the particle size distribution has occurred - neither through aggregation nor through size-discrimination during centrifugation. Moreover, the system was tested in the field and used twice to sample suspended particulate matter from the Elbe estuary directly on site. Based on these first lab-scale experiments, continuous flow centrifugation proves a promising technique bearing potential to alleviate drawbacks such as contamination, filter clogging and particle size-discrimination of commonly used volume-reduced microplastic sampling approaches.
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Affiliation(s)
- L Hildebrandt
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Marine Bioanalytical Chemistry, Max-Planck-Str. 1, 21502, Geesthacht, Germany; Universität Hamburg, Department of Chemistry, Inorganic and Applied Chemistry, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
| | - N Voigt
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Marine Bioanalytical Chemistry, Max-Planck-Str. 1, 21502, Geesthacht, Germany
| | - T Zimmermann
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Marine Bioanalytical Chemistry, Max-Planck-Str. 1, 21502, Geesthacht, Germany; Universität Hamburg, Department of Chemistry, Inorganic and Applied Chemistry, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
| | - A Reese
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Marine Bioanalytical Chemistry, Max-Planck-Str. 1, 21502, Geesthacht, Germany; Universität Hamburg, Department of Chemistry, Inorganic and Applied Chemistry, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
| | - D Proefrock
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Marine Bioanalytical Chemistry, Max-Planck-Str. 1, 21502, Geesthacht, Germany.
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Springer R, Seibertz F, Solano RA, Rubio T, Cyganek L, Zimmermann WH, Voigt N. P1235Acetylcholine-activated inward-rectifier potassium currents in atrial cardiomyocytes derived from induced pluripotent stem cells and atrial engineered heart muscle preparations. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/13/2022] Open
Abstract
Abstract
Background
Abnormal activity of muscarinic receptor (M-receptor) activated potassium current (IK,ACh) has been suggested as a potential atrial-specific drug target for antiarrhythmic therapy in patients with atrial fibrillation (AF). Recent work suggests that atrial myocytes derived from human induced pluripotent stem cells (iPSC-CM) hold great potential for in vitro disease modeling and patient-specific drug testing. Here we aim to investigate functional expression of IK,ACh channels in these cells.
Methods
Atrial differentiation was initiated by temporal WNT and retinoic acid signaling modulation. Action potentials (APs) were recorded using sharp electrode technique in engineered heart muscle preparations (EHM). Currents were measured with voltage-clamp technique in atrial and ventricular iPSC-CM. IK,ACh was activated with a saturating concentration of the non-selective M-receptor agonist carbachol (CCh, 2 μM).
Results
APs measured in atrial EHMs were shorter compared to their ventricular counterparts (AP duration at 90% repolarization [APD90]: 163.2±3.7 ms, n=6 [EHMs] vs. 210.2±3.1 ms, n=3, p<0.001). In addition, application of CCh resulted in APD90 reduction by ∼18% and hyperpolarisation of the resting membrane potential in atrial but not in ventricular EHMs, pointing to functional IK,ACh expression in atrial preparations.
Basal inward-rectifier current, (at −100 mV) in the absence of muscarinic receptor agonists was larger in ventricular iPSC-CM compared to atrial differentiation (−26.1±3.8 pA/pF, n=82/5 [n = cells/line] vs. −15.6±1.6 pA/pF, n=71/5, p<0.02.).
CCh-induced current increase, attributed to IK,ACh, was detectable in all myocytes from atrial preparations (−25.2±3.6 pA/pF, n=71/5). The time course of activation with a slow decrease in current amplitude during the continuous presence of CCh resembled measurements in freshly isolated human atrial myocytes. In ventricular iPSC-CM preparations only 13 out of 73 myocytes showed an increase in inward-rectifier current in response to CCh, suggesting that ventricular preparations may contain a minor fraction of atrial myocytes.
Of note, in the presence of the selective IK,ACh blocker tertiapin (100 nM), CCh had no effect on basal inward-rectifier current, providing further evidence for the molecular identity of the CCh-induced current increase as IK,ACh. Interestingly, TTP reduced basal current amplitude in CM isolated from atrial EHMs by ∼54% suggesting that agonist-independent, constitutively active IK,ACh contributes to the basal inward-rectifier current amplitude in these myocytes.
Conclusion
Our data demonstrate that atrial iPSC-CMs express functional IK,ACh-channels, which can be activated by M-receptor agonists. These findings further outline the potential of atrial iPSC-CMs and EHMs as a promising tool for the investigation of channel-associated pathologies such as AF.
Acknowledgement/Funding
grants from the DFG (VO 1568/3-1, IRTG1816, and SFB1002 project A13), the Else-Kröner-Fresenius Foundation (EKFS 2016_A20) and the DZHK (DZHK GOE MD3)
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Affiliation(s)
- R Springer
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - F Seibertz
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - R A Solano
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - T Rubio
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - L Cyganek
- University Medical Center Gottingen (UMG), Stem Cell Unit, Clinic for Cardiology and Pneumology, Gottingen, Germany
| | - W.-H Zimmermann
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - N Voigt
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
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40
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Affiliation(s)
- Niels Voigt
- German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Göttingen, Germany
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
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Abstract
Drug-drug interactions (DDI) represent a significant problem in modern medicine. The number of patients with multi-morbidity, who take multiple drugs, is constantly increasing (polypharmacy). The related exponential increase in potential DDI is almost incomprehensible. In this article, we review pharmacodynamic DDI and provide clinically relevant examples. In addition, we extensively review pharmakokinetic DDI (e. g. through the cytochrome P450-system or p-glycoproteins) that can modify the plasma concentration of many compounds, thereby also increasing the likelihood of unwanted side effects. Finally we provide tools, which may help clinicians in their daily practice to identify and avoid potential DDI. In the context of an ageing society receiving polypharmacy, a better awareness of DDI and of strategies to prevent them is expected to reduce mortality and morbidity.
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42
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Voigt N, Ort K, Sossalla S. Arzneimittelinteraktionen, die man kennen muss! Pneumologie 2019; 73:306-318. [DOI: 10.1055/a-0863-6242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Two pore-domain potassium (K2P) channels mediate potassium background currents that stabilize the resting membrane potential and facilitate action potential repolarization. In the human heart, hK2P17.1 channels are predominantly expressed in the atria and Purkinje cells. Reduced atrial hK2P17.1 protein levels were described in patients with atrial fibrillation or heart failure. Genetic alterations in hK2P17.1 were associated with cardiac conduction disorders. Little is known about posttranslational modifications of hK2P17.1. Here, we characterized glycosylation of hK2P17.1 and investigated how glycosylation alters its surface expression and activity. Wild-type hK2P17.1 channels and channels lacking specific glycosylation sites were expressed in Xenopus laevis oocytes, HEK-293T cells, and HeLa cells. N-glycosylation was disrupted using N-glycosidase F and tunicamycin. hK2P17.1 expression and activity were assessed using immunoblot analysis and a two-electrode voltage clamp technique. Channel subunits of hK2P17.1 harbor two functional N-glycosylation sites at positions N65 and N94. In hemi-glycosylated hK2P17.1 channels, functionality and membrane trafficking remain preserved. Disruption of both N-glycosylation sites results in loss of hK2P17.1 currents, presumably caused by impaired surface expression. This study confirms diglycosylation of hK2P17.1 channel subunits and its pivotal role in cell-surface targeting. Our findings underline the functional relevance of N-glycosylation in biogenesis and membrane trafficking of ion channels.
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Affiliation(s)
- Felix Wiedmann
- Department of Cardiology, University of Heidelberg, 69120 Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, 69120 Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, 69120 Heidelberg, Germany
| | - Daniel Schlund
- Department of Cardiology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University of Göttingen, 37073 Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, University of Göttingen, 37073 Göttingen, Germany
| | - Antonius Ratte
- Department of Cardiology, University of Heidelberg, 69120 Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, 69120 Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, 69120 Heidelberg, Germany
| | - Manuel Kraft
- Department of Cardiology, University of Heidelberg, 69120 Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, 69120 Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, 69120 Heidelberg, Germany
| | - Hugo A Katus
- Department of Cardiology, University of Heidelberg, 69120 Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, 69120 Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, 69120 Heidelberg, Germany
| | - Constanze Schmidt
- Department of Cardiology, University of Heidelberg, 69120 Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, 69120 Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, 69120 Heidelberg, Germany
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44
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Voigt N, Ort K, Sossalla S. Arzneimittelinteraktionen, die man kennen muss! Akt Dermatol 2019. [DOI: 10.1055/a-0872-5993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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45
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Abstract
Drug-drug interactions (DDI) represent a significant problem in modern medicine. The number of patients with multi-morbidity, who take multiple drugs, is constantly increasing (polypharmacy). The related exponential increase in potential DDI is almost incomprehensible. In this article, we review pharmacodynamic DDI and provide clinically relevant examples. In addition, we extensively review pharmakokinetic DDI (e. g. through the cytochrome P450-system or p-glycoproteins) that can modify the plasma concentration of many compounds, thereby also increasing the likelihood of unwanted side effects. Finally we provide tools, which may help clinicians in their daily practice to identify and avoid potential DDI. In the context of an ageing society receiving polypharmacy, a better awareness of DDI and of strategies to prevent them is expected to reduce mortality and morbidity.
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46
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Affiliation(s)
- Thomas Meyer
- Department of Psychosomatic Medicine and Psychotherapy, University Medical Center Göttingen, Georg-August University Göttingen, Von-Siebold-Str. 5, 37075 Göttingen, Germany.,German Center for Cardiovascular Research (DZHK), partner site Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Niels Voigt
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
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47
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Voigt N, Lehnart SE. Ryanodine receptor dysfunction and the resolution revolution: how Nobel Prize-winning techniques transform cardiovascular research. Cardiovasc Res 2018; 114:e106-e109. [PMID: 30476015 DOI: 10.1093/cvr/cvy235] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Niels Voigt
- Heart Research Center Göttingen, Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research) site Göttingen, Germany
| | - Stephan E Lehnart
- Heart Research Center Göttingen, Department of Cardiology & Pneumology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research) site Göttingen, Germany.,BioMET, Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, MD, USA
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48
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Affiliation(s)
- Constanze Schmidt
- Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, Heidelberg, Germany.,HCR, Heidelberg Center for Heart Rhythm Disorders, University of Heidelberg, Heidelberg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
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Thomas D, Christ T, Fabritz L, Goette A, Hammwöhner M, Heijman J, Kockskämper J, Linz D, Odening KE, Schweizer PA, Wakili R, Voigt N. German Cardiac Society Working Group on Cellular Electrophysiology state-of-the-art paper: impact of molecular mechanisms on clinical arrhythmia management. Clin Res Cardiol 2018; 108:577-599. [PMID: 30306295 DOI: 10.1007/s00392-018-1377-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 09/24/2018] [Indexed: 12/19/2022]
Abstract
Cardiac arrhythmias remain a common challenge and are associated with significant morbidity and mortality. Effective and safe rhythm control strategies are a primary, yet unmet need in everyday clinical practice. Despite significant pharmacological and technological advances, including catheter ablation and device-based therapies, the development of more effective alternatives is of significant interest to increase quality of life and to reduce symptom burden, hospitalizations and mortality. The mechanistic understanding of pathophysiological pathways underlying cardiac arrhythmias has advanced profoundly, opening up novel avenues for mechanism-based therapeutic approaches. Current management of arrhythmias, however, is primarily guided by clinical and demographic characteristics of patient groups as opposed to individual, patient-specific mechanisms and pheno-/genotyping. With this state-of-the-art paper, the Working Group on Cellular Electrophysiology of the German Cardiac Society aims to close the gap between advanced molecular understanding and clinical decision-making in cardiac electrophysiology. The significance of cellular electrophysiological findings for clinical arrhythmia management constitutes the main focus of this document. Clinically relevant knowledge of pathophysiological pathways of arrhythmias and cellular mechanisms of antiarrhythmic interventions are summarized. Furthermore, the specific molecular background for the initiation and perpetuation of atrial and ventricular arrhythmias and mechanism-based strategies for therapeutic interventions are highlighted. Current "hot topics" in atrial fibrillation are critically appraised. Finally, the establishment and support of cellular and translational electrophysiology programs in clinical rhythmology departments is called for to improve basic-science-guided patient management.
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Affiliation(s)
- Dierk Thomas
- Department of Cardiology, Medical University Hospital, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany. .,HCR (Heidelberg Center for Heart Rhythm Disorders), Heidelberg, Germany. .,DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, Heidelberg, Germany.
| | - Torsten Christ
- Department of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Center for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Larissa Fabritz
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK.,Department of Cardiology, UHB NHS Trust, Birmingham, UK.,Department of Cardiovascular Medicine, Division of Rhythmology, University Hospital Münster, Münster, Germany
| | - Andreas Goette
- St. Vincenz-Hospital, Paderborn, Germany.,Working Group: Molecular Electrophysiology, University Hospital Magdeburg, Magdeburg, Germany
| | - Matthias Hammwöhner
- St. Vincenz-Hospital, Paderborn, Germany.,Working Group: Molecular Electrophysiology, University Hospital Magdeburg, Magdeburg, Germany
| | - Jordi Heijman
- Institute of Pharmacology, West German Heart and Vascular Center, University Duisburg-Essen, Essen, Germany.,Cardiovascular Research Institute Maastricht, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Jens Kockskämper
- Biochemical and Pharmacological Center (BPC) Marburg, Institute of Pharmacology and Clinical Pharmacy, University of Marburg, Marburg, Germany
| | - Dominik Linz
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute, University of Adelaide and Royal Adelaide Hospital, Adelaide, SA, Australia.,Experimental Electrophysiology, University Hospital of Saarland, Homburg, Saar, Germany
| | - Katja E Odening
- Department of Cardiology and Angiology I, Heart Center University of Freiburg, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Institute for Experimental Cardiovascular Medicine, Heart Center University of Freiburg, Freiburg, Germany
| | - Patrick A Schweizer
- Department of Cardiology, Medical University Hospital, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.,HCR (Heidelberg Center for Heart Rhythm Disorders), Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), partner site Heidelberg/Mannheim, Heidelberg, Germany.,Heidelberg Research Center for Molecular Medicine (HRCMM), Heidelberg, Germany
| | - Reza Wakili
- Department of Cardiology and Vascular Medicine, Medical Faculty, West German Heart Center, University Hospital Essen, Essen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany. .,DZHK (German Center for Cardiovascular Research), partner site Göttingen, Göttingen, Germany.
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Brandenburg S, Pawlowitz J, Fakuade FE, Kownatzki-Danger D, Kohl T, Mitronova GY, Scardigli M, Neef J, Schmidt C, Wiedmann F, Pavone FS, Sacconi L, Kutschka I, Sossalla S, Moser T, Voigt N, Lehnart SE. Axial Tubule Junctions Activate Atrial Ca 2+ Release Across Species. Front Physiol 2018; 9:1227. [PMID: 30349482 PMCID: PMC6187065 DOI: 10.3389/fphys.2018.01227] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [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] [Received: 05/02/2018] [Accepted: 08/14/2018] [Indexed: 01/10/2023] Open
Abstract
Rationale: Recently, abundant axial tubule (AT) membrane structures were identified deep inside atrial myocytes (AMs). Upon excitation, ATs rapidly activate intracellular Ca2+ release and sarcomeric contraction through extensive AT junctions, a cell-specific atrial mechanism. While AT junctions with the sarcoplasmic reticulum contain unusually large clusters of ryanodine receptor 2 (RyR2) Ca2+ release channels in mouse AMs, it remains unclear if similar protein networks and membrane structures exist across species, particularly those relevant for atrial disease modeling. Objective: To examine and quantitatively analyze the architecture of AT membrane structures and associated Ca2+ signaling proteins across species from mouse to human. Methods and Results: We developed superresolution microscopy (nanoscopy) strategies for intact live AMs based on a new custom-made photostable cholesterol dye and immunofluorescence imaging of membraneous structures and membrane proteins in fixed tissue sections from human, porcine, and rodent atria. Consistently, in mouse, rat, and rabbit AMs, intact cell-wide tubule networks continuous with the surface membrane were observed, mainly composed of ATs. Moreover, co-immunofluorescence nanoscopy showed L-type Ca2+ channel clusters adjacent to extensive junctional RyR2 clusters at ATs. However, only junctional RyR2 clusters were highly phosphorylated and may thus prime Ca2+ release at ATs, locally for rapid signal amplification. While the density of the integrated L-type Ca2+ current was similar in human and mouse AMs, the intracellular Ca2+ transient showed quantitative differences. Importantly, local intracellular Ca2+ release from AT junctions occurred through instantaneous action potential propagation via transverse tubules (TTs) from the surface membrane. Hence, sparse TTs were sufficient as electrical conduits for rapid activation of Ca2+ release through ATs. Nanoscopy of atrial tissue sections confirmed abundant ATs as the major network component of AMs, particularly in human atrial tissue sections. Conclusion: AT junctions represent a conserved, cell-specific membrane structure for rapid excitation-contraction coupling throughout a representative spectrum of species including human. Since ATs provide the major excitable membrane network component in AMs, a new model of atrial “super-hub” Ca2+ signaling may apply across biomedically relevant species, opening avenues for future investigations about atrial disease mechanisms and therapeutic targeting.
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Affiliation(s)
- Sören Brandenburg
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Jan Pawlowitz
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Funsho E Fakuade
- Heart Research Center Göttingen, Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
| | - Daniel Kownatzki-Danger
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Tobias Kohl
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Gyuzel Y Mitronova
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Marina Scardigli
- European Laboratory for Non-Linear Spectroscopy and National Institute of Optics (INO-CNR), Sesto Fiorentino, Italy
| | - Jakob Neef
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany
| | - Constanze Schmidt
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, University of Heidelberg, Heidelberg, Germany.,Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Heidelberg, Germany
| | - Felix Wiedmann
- Department of Cardiology, University Hospital Heidelberg, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research) partner site Heidelberg/Mannheim, University of Heidelberg, Heidelberg, Germany.,Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Heidelberg, Germany
| | - Francesco S Pavone
- European Laboratory for Non-Linear Spectroscopy and National Institute of Optics (INO-CNR), Sesto Fiorentino, Italy.,Department of Physics, University of Florence, Florence, Italy
| | - Leonardo Sacconi
- European Laboratory for Non-Linear Spectroscopy and National Institute of Optics (INO-CNR), Sesto Fiorentino, Italy
| | - Ingo Kutschka
- Department of Cardiothoracic and Vascular Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Samuel Sossalla
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
| | - Tobias Moser
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany
| | - Niels Voigt
- Heart Research Center Göttingen, Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research) partner site Göttingen, Göttingen, Germany
| | - Stephan E Lehnart
- Heart Research Center Göttingen, Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research) partner site Göttingen, Göttingen, Germany.,BioMET, The Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, MD, United States
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