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Hartmann N, Knierim M, Maurer W, Dybkova N, Zeman F, Hasenfuß G, Sossalla S, Streckfuss-Bömeke K. Na V1.8 as Proarrhythmic Target in a Ventricular Cardiac Stem Cell Model. Int J Mol Sci 2024; 25:6144. [PMID: 38892333 PMCID: PMC11172914 DOI: 10.3390/ijms25116144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 05/25/2024] [Accepted: 05/30/2024] [Indexed: 06/21/2024] Open
Abstract
The sodium channel NaV1.8, encoded by the SCN10A gene, has recently emerged as a potential regulator of cardiac electrophysiology. We have previously shown that NaV1.8 contributes to arrhythmogenesis by inducing a persistent Na+ current (late Na+ current, INaL) in human atrial and ventricular cardiomyocytes (CM). We now aim to further investigate the contribution of NaV1.8 to human ventricular arrhythmogenesis at the CM-specific level using pharmacological inhibition as well as a genetic knockout (KO) of SCN10A in induced pluripotent stem cell CM (iPSC-CM). In functional voltage-clamp experiments, we demonstrate that INaL was significantly reduced in ventricular SCN10A-KO iPSC-CM and in control CM after a specific pharmacological inhibition of NaV1.8. In contrast, we did not find any effects on ventricular APD90. The frequency of spontaneous sarcoplasmic reticulum Ca2+ sparks and waves were reduced in SCN10A-KO iPSC-CM and control cells following the pharmacological inhibition of NaV1.8. We further analyzed potential triggers of arrhythmias and found reduced delayed afterdepolarizations (DAD) in SCN10A-KO iPSC-CM and after the specific inhibition of NaV1.8 in control cells. In conclusion, we show that NaV1.8-induced INaL primarily impacts arrhythmogenesis at a subcellular level, with minimal effects on systolic cellular Ca2+ release. The inhibition or knockout of NaV1.8 diminishes proarrhythmic triggers in ventricular CM. In conjunction with our previously published results, this work confirms NaV1.8 as a proarrhythmic target that may be useful in an anti-arrhythmic therapeutic strategy.
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Affiliation(s)
- Nico Hartmann
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Maria Knierim
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
- Clinic for Cardio-Thoracic and Vascular Surgery, University Medical Center, 37075 Göttingen, Germany
| | - Wiebke Maurer
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Nataliya Dybkova
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Florian Zeman
- Center for Clinicial Trials, University of Regensburg, 93042 Regensburg, Germany
| | - Gerd Hasenfuß
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Samuel Sossalla
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
- Medical Clinic I, Cardiology and Angiology, Giessen and Department of Cardiology at Kerckhoff Heart and Lung Center, Justus-Liebig-University, 61231 Bad Nauheim, Germany
| | - Katrin Streckfuss-Bömeke
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
- Institute of Pharmacology and Toxicology, University of Würzburg, 97078 Würzburg, Germany
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Hartmann N, Knierim M, Maurer W, Dybkova N, Hasenfuß G, Sossalla S, Streckfuss-Bömeke K. Molecular and Functional Relevance of Na V1.8-Induced Atrial Arrhythmogenic Triggers in a Human SCN10A Knock-Out Stem Cell Model. Int J Mol Sci 2023; 24:10189. [PMID: 37373335 DOI: 10.3390/ijms241210189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 05/26/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023] Open
Abstract
In heart failure and atrial fibrillation, a persistent Na+ current (INaL) exerts detrimental effects on cellular electrophysiology and can induce arrhythmias. We have recently shown that NaV1.8 contributes to arrhythmogenesis by inducing a INaL. Genome-wide association studies indicate that mutations in the SCN10A gene (NaV1.8) are associated with increased risk for arrhythmias, Brugada syndrome, and sudden cardiac death. However, the mediation of these NaV1.8-related effects, whether through cardiac ganglia or cardiomyocytes, is still a subject of controversial discussion. We used CRISPR/Cas9 technology to generate homozygous atrial SCN10A-KO-iPSC-CMs. Ruptured-patch whole-cell patch-clamp was used to measure the INaL and action potential duration. Ca2+ measurements (Fluo 4-AM) were performed to analyze proarrhythmogenic diastolic SR Ca2+ leak. The INaL was significantly reduced in atrial SCN10A KO CMs as well as after specific pharmacological inhibition of NaV1.8. No effects on atrial APD90 were detected in any groups. Both SCN10A KO and specific blockers of NaV1.8 led to decreased Ca2+ spark frequency and a significant reduction of arrhythmogenic Ca2+ waves. Our experiments demonstrate that NaV1.8 contributes to INaL formation in human atrial CMs and that NaV1.8 inhibition modulates proarrhythmogenic triggers in human atrial CMs and therefore NaV1.8 could be a new target for antiarrhythmic strategies.
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Affiliation(s)
- Nico Hartmann
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Maria Knierim
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
- Clinic for Cardio-Thoracic and Vascular Surgery, University Medical Center, 37075 Göttingen, Germany
| | - Wiebke Maurer
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Nataliya Dybkova
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Gerd Hasenfuß
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
| | - Samuel Sossalla
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
- Departments of Cardiology at Kerckhoff Heart and Lung Center, Bad Nauheim and University of Giessen, 61231 Bad Nauheim, Germany
| | - Katrin Streckfuss-Bömeke
- Clinic for Cardiology and Pneumology, University Medical Center, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen and Rhein Main, 61231 Bad Nauheim, Germany
- Institute of Pharmacology and Toxicology, University of Würzburg, 97078 Würzburg, Germany
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Goktas Sahoglu S, Kazci YE, Tuncay E, Torun T, Akdeniz C, Tuzcu V, Cagavi E. Functional evaluation of the tachycardia patient-derived iPSC cardiomyocytes carrying a novel pathogenic SCN5A variant. J Cell Physiol 2022; 237:3900-3911. [PMID: 35959596 DOI: 10.1002/jcp.30843] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/29/2022] [Accepted: 07/18/2022] [Indexed: 12/11/2022]
Abstract
Tachycardia is characterized by high beating rates that can lead to life-threatening fibrillations. Mutations in several ion-channel genes were implicated with tachycardia; however, the complex genetic contributors and their modes of action are still unclear. Here, we investigated the influence of an SCN5A gene variant on tachycardia phenotype by deriving patient-specific iPSCs and cardiomyocytes (iPSC-CM). Two tachycardia patients were genetically analyzed and revealed to inherit a heterozygous p.F1465L variant in the SCN5A gene. Gene expression and immunocytochemical analysis in iPSC-CMs generated from patients did not show any significant changes in mRNA levels of SCN5A or gross NaV1.5 cellular mislocalization, compared to healthy-derived iPSC-CMs. Electrophysiological and contraction imaging analysis in patient iPSC-CMs revealed intermittent fibrillation-like states, occasional arrhythmic events, and sustained high-paced contractions that could be selectively reduced by flecainide treatment. The patch-clamp analysis demonstrated a negative shift in the voltage-dependent activation at the patient-derived iPSC-CMs compared to the healthy control line, suggestive of a gain-of-function activity associated with the SCN5A+/p.F1465L variant. Our patient-derived iPSC-CM model recapitulated the clinically relevant characteristics of tachycardia associated with a novel pathogenic SCN5A+/p.F1465L variant leading to altered Na+ channel kinetics as the likely mechanism underlying high excitability and tachycardia phenotype.
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Affiliation(s)
- Sevilay Goktas Sahoglu
- Research Institute for Health Sciences and Technologies (SABITA), Istanbul Medipol University, Istanbul, Turkey.,Institute of Health Sciences, Neuroscience Program, Istanbul Medipol University, Istanbul, Turkey.,Department of Medical Biology, School of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Yusuf Enes Kazci
- Research Institute for Health Sciences and Technologies (SABITA), Istanbul Medipol University, Istanbul, Turkey.,Institute of Health Sciences, Neuroscience Program, Istanbul Medipol University, Istanbul, Turkey.,Deparment of Medical Biology, International School of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Erkan Tuncay
- Department of Biophysics, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Tugce Torun
- Research Institute for Health Sciences and Technologies (SABITA), Istanbul Medipol University, Istanbul, Turkey.,Medical Biology and Genetics Program, Institute of Health Sciences, Istanbul Medipol University, Istanbul, Turkey
| | - Celal Akdeniz
- Department of Pediatric Cardiology, School of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Volkan Tuzcu
- Department of Pediatric Cardiology, School of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Esra Cagavi
- Research Institute for Health Sciences and Technologies (SABITA), Istanbul Medipol University, Istanbul, Turkey.,Department of Medical Biology, School of Medicine, Istanbul Medipol University, Istanbul, Turkey.,Deparment of Medical Biology, International School of Medicine, Istanbul Medipol University, Istanbul, Turkey.,Medical Biology and Genetics Program, Institute of Health Sciences, Istanbul Medipol University, Istanbul, Turkey
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Tomsits P, Clauss S, Kääb S. Genetic insight into sick sinus syndrome. Is there a pill for it or how far are we on the translational road to personalized medicine? Eur Heart J 2021; 42:1972-1975. [PMID: 33860310 DOI: 10.1093/eurheartj/ehab209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Affiliation(s)
- Philipp Tomsits
- University Hospital Munich, Ludwig-Maximilians University Munich (LMU), Department of Medicine I, Campus Grosshadern, Marchioninistrasse 15, D-81377 Munich, Germany.,German Center for Cardiovascular Research (DZHK), Partner Site Munich, Munich Heart Alliance, Munich, Germany.,Institute of Surgical Research at the Walter-Brendel-Centre of Experimental Medicine, University Hospital, LMU Munich, Marchioninistrasse 27, D-81377 Munich, Germany
| | - Sebastian Clauss
- University Hospital Munich, Ludwig-Maximilians University Munich (LMU), Department of Medicine I, Campus Grosshadern, Marchioninistrasse 15, D-81377 Munich, Germany.,German Center for Cardiovascular Research (DZHK), Partner Site Munich, Munich Heart Alliance, Munich, Germany.,Institute of Surgical Research at the Walter-Brendel-Centre of Experimental Medicine, University Hospital, LMU Munich, Marchioninistrasse 27, D-81377 Munich, Germany
| | - Stefan Kääb
- University Hospital Munich, Ludwig-Maximilians University Munich (LMU), Department of Medicine I, Campus Grosshadern, Marchioninistrasse 15, D-81377 Munich, Germany.,German Center for Cardiovascular Research (DZHK), Partner Site Munich, Munich Heart Alliance, Munich, Germany
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Man JCK, Bosada FM, Scholman KT, Offerhaus JA, Walsh R, van Duijvenboden K, van Eif VWW, Bezzina CR, Verkerk AO, Boukens BJ, Barnett P, Christoffels VM. Variant Intronic Enhancer Controls SCN10A-short Expression and Heart Conduction. Circulation 2021; 144:229-242. [PMID: 33910361 DOI: 10.1161/circulationaha.121.054083] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Genetic variants in SCN10A, encoding the neuronal voltage-gated sodium channel NaV1.8, are strongly associated with atrial fibrillation, Brugada syndrome, cardiac conduction velocities, and heart rate. The cardiac function of SCN10A has not been resolved, however, and diverging mechanisms have been proposed. Here, we investigated the cardiac expression of SCN10A and the function of a variant-sensitive intronic enhancer previously linked to the regulation of SCN5A, encoding the major essential cardiac sodium channel NaV1.5. METHODS The expression of SCN10A was investigated in mouse and human hearts. With the use of CRISPR/Cas9 genome editing, the mouse intronic enhancer was disrupted, and mutant mice were characterized by transcriptomic and electrophysiological analyses. The association of genetic variants at SCN5A-SCN10A enhancer regions and gene expression were evaluated by genome-wide association studies single-nucleotide polymorphism mapping and expression quantitative trait loci analysis. RESULTS We found that cardiomyocytes of the atria, sinoatrial node, and ventricular conduction system express a short transcript comprising the last 7 exons of the gene (Scn10a-short). Transcription occurs from an intronic enhancer-promoter complex, whereas full-length Scn10a transcript was undetectable in the human and mouse heart. Expression quantitative trait loci analysis revealed that the genetic variants in linkage disequilibrium with genetic variant rs6801957 in the intronic enhancer associate with SCN10A transcript levels in the heart. Genetic modification of the enhancer in the mouse genome led to reduced cardiac Scn10a-short expression in atria and ventricles, reduced cardiac sodium current in atrial cardiomyocytes, atrial conduction slowing and arrhythmia, whereas the expression of Scn5a, the presumed enhancer target gene, remained unaffected. In patch-clamp transfection experiments, expression of Scn10a-short-encoded NaV1.8-short increased NaV1.5-mediated sodium current. We propose that noncoding genetic variation modulates transcriptional regulation of Scn10a-short in cardiomyocytes that impacts NaV1.5-mediated sodium current and heart rhythm. CONCLUSIONS Genetic variants in and around SCN10A modulate enhancer function and expression of a cardiac-specific SCN10A-short transcript. We propose that noncoding genetic variation modulates transcriptional regulation of a functional C-terminal portion of NaV1.8 in cardiomyocytes that impacts on NaV1.5 function, cardiac conduction velocities, and arrhythmia susceptibility.
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Affiliation(s)
- Joyce C K Man
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Fernanda M Bosada
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Koen T Scholman
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Joost A Offerhaus
- Department of Experimental Cardiology (J.A.O., R.W., C.R.B., A.O.V., B.J.B.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Roddy Walsh
- Department of Experimental Cardiology (J.A.O., R.W., C.R.B., A.O.V., B.J.B.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Karel van Duijvenboden
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Vincent W W van Eif
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Connie R Bezzina
- Department of Experimental Cardiology (J.A.O., R.W., C.R.B., A.O.V., B.J.B.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Arie O Verkerk
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Department of Experimental Cardiology (J.A.O., R.W., C.R.B., A.O.V., B.J.B.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Bastiaan J Boukens
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Department of Experimental Cardiology (J.A.O., R.W., C.R.B., A.O.V., B.J.B.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Phil Barnett
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
| | - Vincent M Christoffels
- Department of Medical Biology (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands.,Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development (J.C.K.M., F.M.B., K.T.S., K.v.D., V.W.W.v.E., A.O.V., B.J.B., P.B., V.M.C.), Amsterdam UMC, University of Amsterdam, location AMC, The Netherlands
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