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Amoni M, Ingelaere S, Moeyersons J, Wets D, Tanushi A, Van Huffel S, Varon C, Sipido K, Claus P, Willems R. Regional beat-to-beat variability of repolarization increases during ischemia and predicts imminent arrhythmias in a pig model of myocardial infarction. Am J Physiol Heart Circ Physiol 2023; 325:H54-H65. [PMID: 37145956 PMCID: PMC10511165 DOI: 10.1152/ajpheart.00732.2022] [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: 12/30/2022] [Revised: 04/07/2023] [Accepted: 04/21/2023] [Indexed: 05/07/2023]
Abstract
Ventricular arrhythmia (VT/VF) can complicate acute myocardial ischemia (AMI). Regional instability of repolarization during AMI contributes to the substrate for VT/VF. Beat-to-beat variability of repolarization (BVR), a measure of repolarization lability increases during AMI. We hypothesized that its surge precedes VT/VF. We studied the spatial and temporal changes in BVR in relation to VT/VF during AMI. In 24 pigs, BVR was quantified on 12-lead electrocardiogram recorded at a sampling rate of 1 kHz. AMI was induced in 16 pigs by percutaneous coronary artery occlusion (MI), whereas 8 underwent sham operation (sham). Changes in BVR were assessed at 5 min after occlusion, 5 and 1 min pre-VF in animals that developed VF, and matched time points in pigs without VF. Serum troponin and ST deviation were measured. After 1 mo, magnetic resonance imaging and VT induction by programmed electrical stimulation were performed. During AMI, BVR increased significantly in inferior-lateral leads correlating with ST deviation and troponin increase. BVR was maximal 1 min pre-VF (3.78 ± 1.36 vs. 5 min pre-VF, 1.67 ± 1.56, P < 0.0001). After 1 mo, BVR was higher in MI than in sham and correlated with the infarct size (1.43 ± 0.50 vs. 0.57 ± 0.30, P = 0.009). VT was inducible in all MI animals and the ease of induction correlated with BVR. BVR increased during AMI and temporal BVR changes predicted imminent VT/VF, supporting a possible role in monitoring and early warning systems. BVR correlated to arrhythmia vulnerability suggesting utility in risk stratification post-AMI.NEW & NOTEWORTHY The key finding of this study is that BVR increases during AMI and surges before ventricular arrhythmia onset. This suggests that monitoring BVR may be useful for monitoring the risk of VF during and after AMI in the coronary care unit settings. Beyond this, monitoring BVR may have value in cardiac implantable devices or wearables.
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Affiliation(s)
- Matthew Amoni
- Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiology, University Hospitals, Leuven, Belgium
| | - Sebastian Ingelaere
- Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiology, University Hospitals, Leuven, Belgium
| | - Jonathan Moeyersons
- Department of Electrical Engineering, STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, KU Leuven, Leuven, Belgium
| | - Dries Wets
- Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Aldo Tanushi
- Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Sabine Van Huffel
- Department of Electrical Engineering, STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, KU Leuven, Leuven, Belgium
| | - Carolina Varon
- Department of Electrical Engineering, STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, KU Leuven, Leuven, Belgium
- Microgravity Research Center, Université Libre de Bruxelles, Brussels, Belgium
| | - Karin Sipido
- Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Piet Claus
- Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Rik Willems
- Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiology, University Hospitals, Leuven, Belgium
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Jin X, Meletiou A, Chung J, Tilunaite A, Demydenko K, Dries E, Puertas RD, Amoni M, Tomar A, Claus P, Soeller C, Rajagopal V, Sipido K, Roderick HL. InsP 3R-RyR channel crosstalk augments sarcoplasmic reticulum Ca 2+ release and arrhythmogenic activity in post-MI pig cardiomyocytes. J Mol Cell Cardiol 2023; 179:47-59. [PMID: 37003353 DOI: 10.1016/j.yjmcc.2023.03.015] [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: 11/17/2022] [Revised: 03/08/2023] [Accepted: 03/28/2023] [Indexed: 04/03/2023]
Abstract
Ca2+ transients (CaT) underlying cardiomyocyte (CM) contraction require efficient Ca2+ coupling between sarcolemmal Ca2+ channels and sarcoplasmic reticulum (SR) ryanodine receptor Ca2+ channels (RyR) for their generation; reduced coupling in disease contributes to diminished CaT and arrhythmogenic Ca2+ events. SR Ca2+ release also occurs via inositol 1,4,5-trisphosphate receptors (InsP3R) in CM. While this pathway contributes negligeably to Ca2+ handling in healthy CM, rodent studies support a role in altered Ca2+ dynamics and arrhythmogenic Ca2+ release involving InsP3R crosstalk with RyRs in disease. Whether this mechanism persists in larger mammals with lower T-tubular density and coupling of RyRs is not fully resolved. We have recently shown an arrhythmogenic action of InsP3-induced Ca2+ release (IICR) in end stage human heart failure, often associated with underlying ischemic heart disease (IHD). How IICR contributes to early stages of disease is however not determined but highly relevant. To access this stage, we chose a porcine model of IHD, which shows substantial remodelling of the area adjacent to the infarct. In cells from this region, IICR preferentially augmented Ca2+ release from non-coupled RyR clusters that otherwise showed delayed activation during the CaT. IICR in turn synchronised Ca2+ release during the CaT but also induced arrhythmogenic delayed afterdepolarizations and action potentials. Nanoscale imaging identified co-clustering of InsP3Rs and RyRs, thereby allowing Ca2+-mediated channel crosstalk. Mathematical modelling supported and further delineated this mechanism of enhanced InsP3R-RyRs coupling in MI. Our findings highlight the role of InsP3R-RyR channel crosstalk in Ca2+ release and arrhythmia during post-MI remodelling.
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Affiliation(s)
- Xin Jin
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - Anna Meletiou
- Department of Physiology, University of Bern, Bern, Switzerland
| | - Joshua Chung
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium; Cell Structure and Mechanobiology Group, Department of Biomedical Engineering, Melbourne School of Engineering, University of Melbourne, Australia
| | - Agne Tilunaite
- Cell Structure and Mechanobiology Group, Department of Biomedical Engineering, Melbourne School of Engineering, University of Melbourne, Australia; Systems Biology Laboratory, School of Mathematics and Statistics, and Department of Biomedical Engineering, University of Melbourne, Australia
| | - Kateryna Demydenko
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - Eef Dries
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - Rosa Doñate Puertas
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - Matthew Amoni
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - Ashutosh Tomar
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - Piet Claus
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | | | - Vijay Rajagopal
- Cell Structure and Mechanobiology Group, Department of Biomedical Engineering, Melbourne School of Engineering, University of Melbourne, Australia
| | - Karin Sipido
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium
| | - H Llewelyn Roderick
- KU Leuven, Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, B-3000 Leuven, Belgium.
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3
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Cools B, Nagaraju CK, Vandendriessche K, van Puyvelde J, Youness M, Roderick HL, Gewillig M, Sipido K, Claus P, Rega F. Reversal of Right Ventricular Remodeling After Correction of Pulmonary Regurgitation in Tetralogy of Fallot. JACC Basic Transl Sci 2022; 8:301-315. [PMID: 37034286 PMCID: PMC10077151 DOI: 10.1016/j.jacbts.2022.09.008] [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] [Received: 02/11/2022] [Revised: 09/09/2022] [Accepted: 09/12/2022] [Indexed: 12/15/2022]
Abstract
In the sheep model with pathophysiologic changes similar to patients with repaired TOF, severe PR leads to fibrotic changes in the RV. Pulmonary valve replacement reverses these fibrotic changes. Early valve replacement led to a quick RV recovery, and in time there was no difference in outcome between early and late valve replacement. These data support the benefit of valve replacement for RV function and suggest that there is a margin in the timing of the surgery. The fibrotic changes correlated well with the circulating biomarker PICP, which can have an added value in the clinical follow-up of patients with repaired TOF.
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Affiliation(s)
- Bjorn Cools
- Department of Pediatric and Congenital Cardiology, University Hospitals Leuven, Leuven, Belgium
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | | | | | - Joeri van Puyvelde
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Mohamad Youness
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | | | - Marc Gewillig
- Department of Pediatric and Congenital Cardiology, University Hospitals Leuven, Leuven, Belgium
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Karin Sipido
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Piet Claus
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Filip Rega
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
- Address for correspondence: Dr Filip Rega, Department of Cardiac Surgery, University Hospitals Leuven, Herestraat 49, B-3000 Leuven, Belgium.
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Ekhteraeitousi S, Amoni M, Vermoortele D, Puertas RD, Youness M, Ingelaere S, Willems R, Claus P, Nagaraju CK, Thienpont B, Sipido K, Roderick HL. Altered multicellular composition and unique myocyte phenotypes characterize the arrhythmogenic infarct border zone. J Mol Cell Cardiol 2022. [DOI: 10.1016/j.yjmcc.2022.08.179] [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: 01/01/2023]
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Jin X, Amoni M, Gilbert G, Dries E, Doñate Puertas R, Tomar A, Nagaraju CK, Pradhan A, Yule DI, Martens T, Menten R, Vanden Berghe P, Rega F, Sipido K, Roderick HL. InsP 3R-RyR Ca 2+ channel crosstalk facilitates arrhythmias in the failing human ventricle. Basic Res Cardiol 2022; 117:60. [PMID: 36378362 DOI: 10.1007/s00395-022-00967-y] [Citation(s) in RCA: 7] [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: 06/27/2022] [Revised: 10/13/2022] [Accepted: 10/31/2022] [Indexed: 11/16/2022]
Abstract
Dysregulated intracellular Ca2+ handling involving altered Ca2+ release from intracellular stores via RyR channels underlies both arrhythmias and reduced function in heart failure (HF). Mechanisms linking RyR dysregulation and disease are not fully established. Studies in animals support a role for InsP3 receptor Ca2+ channels (InsP3R) in pathological alterations in cardiomyocyte Ca2+ handling but whether these findings translate to the divergent physiology of human cardiomyocytes during heart failure is not determined. Using electrophysiological and Ca2+ recordings in human ventricular cardiomyocytes, we uncovered that Ca2+ release via InsP3Rs facilitated Ca2+ release from RyR and induced arrhythmogenic delayed after depolarisations and action potentials. InsP3R-RyR crosstalk was particularly increased in HF at RyR clusters isolated from the T-tubular network. Reduced SERCA activity in HF further facilitated the action of InsP3. Nanoscale imaging revealed co-localisation of InsP3Rs with RyRs in the dyad, which was increased in HF, providing a mechanism for augmented Ca2+ channel crosstalk. Notably, arrhythmogenic activity dependent on InsP3Rs was increased in tissue wedges from failing hearts perfused with AngII to promote InsP3 generation. These data indicate a central role for InsP3R-RyR Ca2+ signalling crosstalk in the pro-arrhythmic action of GPCR agonists elevated in HF and the potential for their therapeutic targeting.
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Affiliation(s)
- Xin Jin
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium.,Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Matthew Amoni
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Guillaume Gilbert
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Eef Dries
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Rosa Doñate Puertas
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Ashutosh Tomar
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Chandan K Nagaraju
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Ankit Pradhan
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - David I Yule
- Department of Pharmacology and Physiology, Medical Center School of Medicine and Dentistry, University of Rochester, 601 Elmwood Avenue, Box 711, Rochester, NY, 14642, USA
| | - Tobie Martens
- Laboratory for Enteric NeuroScience (LENS), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, 3000, Leuven, Belgium.,Cell and Tissue Imaging Cluster (CIC), KU Leuven, 3000, Leuven, Belgium
| | - Roxane Menten
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - Pieter Vanden Berghe
- Laboratory for Enteric NeuroScience (LENS), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, 3000, Leuven, Belgium.,Cell and Tissue Imaging Cluster (CIC), KU Leuven, 3000, Leuven, Belgium
| | - Filip Rega
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium.,Department of Cardiology and Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Karin Sipido
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium
| | - H Llewelyn Roderick
- Department of Cardiovascular Sciences, Laboratory of Experimental Cardiology, KU Leuven, 3000, Leuven, Belgium.
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Amoni M, Ingelaere S, Moeyersons J, Vandenberk B, Claus P, Lemmens R, Van Huffel S, Sipido K, Varon C, Willems R. Temporal Changes in Beat-to-Beat Variability of Repolarization Predict Imminent Nonsustained Ventricular Tachycardia in Patients With Ischemic and Nonischemic Dilated Cardiomyopathy. J Am Heart Assoc 2022; 11:e024294. [PMID: 35730633 PMCID: PMC9333369 DOI: 10.1161/jaha.121.024294] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background An increase in beat‐to‐beat variability of repolarization (BVR) predicts arrhythmia onset in experimental models, but its clinical translation is not well established. We investigated the temporal changes in BVR before nonsustained ventricular tachycardia (nsVT) in patients with implantable cardioverter defibrillator (ICD). Methods and Results Patients with nsVT on 24‐hour Holter before ICD implantation for ischemic cardiomyopathy (ischemic cardiomyopathy+nsVT, n=43) or dilated cardiomyopathy (dilated cardiomyopathy+nsVT, n=37), matched ICD candidates without nsVT (ischemic cardiomyopathy‐nsVT, n=29 and dilated cardiomyopathy‐nsVT, n=26), and patients without ICD without structural heart disease (n=50) were studied. Digital Holter recordings from these patients were analyzed using a modified fiducial segment averaging technique to detect the QT interval. The nsVT episodes were semi‐automatically identified and QT‐BVR was assessed 1‐, 5‐, and 30‐minutes before nsVT, and at rest (at 3:00 am). Resting BVR was higher in ICD patients compared with controls without structural heart disease. In ICD patients with nsVT, BVR increased significantly 1‐minute pre‐nsVT in ischemic cardiomyopathy (2.21±0.59 ms, versus 5 minutes pre‐nsVT: 1.78±0.50 ms, P<0.001) and dilated cardiomyopathy (2.09±0.57 ms, versus 5‐minutes pre‐nsVT: 1.58±0.51 ms, P<0.001), but not in patients without nsVT. In multivariable Cox regression analysis, pre‐nsVT BVR was a significant predictor for appropriate therapy during follow‐up. Conclusions Baseline BVR is elevated and temporal changes in BVR predict imminent nsVT events in patients with ICD independent of underlying cause. Real‐time BVR monitoring could be used to predict impending ventricular arrhythmia and allow preventive therapy to be incorporated into ICDs.
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Affiliation(s)
- Matthew Amoni
- Cardiology University Hospitals Leuven Leuven Belgium.,Experimental Cardiology, Department of Cardiovascular Sciences University of Leuven Belgium
| | - Sebastian Ingelaere
- Cardiology University Hospitals Leuven Leuven Belgium.,Experimental Cardiology, Department of Cardiovascular Sciences University of Leuven Belgium
| | - Jonathan Moeyersons
- STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, Department of Electrical Engineering University of Leuven Belgium
| | | | - Piet Claus
- Imaging and Cardiovascular Dynamics, Department of Cardiovascular Sciences KU Leuven Leuven Belgium
| | - Robin Lemmens
- Neurology University Hospitals Leuven Leuven Belgium.,Laboratory of Neurobiology, Department of Neurosciences University of Leuven Belgium
| | - Sabine Van Huffel
- STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, Department of Electrical Engineering University of Leuven Belgium
| | - Karin Sipido
- Experimental Cardiology, Department of Cardiovascular Sciences University of Leuven Belgium
| | - Carolina Varon
- STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, Department of Electrical Engineering University of Leuven Belgium
| | - Rik Willems
- Cardiology University Hospitals Leuven Leuven Belgium.,Experimental Cardiology, Department of Cardiovascular Sciences University of Leuven Belgium
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Vermoortele D, Amoni M, Ingelaere S, Holemans P, Willems R, Sipido K, Claus P. Repolarization heterogeneity within the myocardial infarction border zone correlates with variability of myocyte remodeling. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0622] [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: 11/14/2022] Open
Abstract
Abstract
Background
Myocardial infarction (MI) results in a regional scar, with a border zone (BZ) of surviving myocytes interspersed with fibrosis providing an anatomical substrate for re-entry. Heterogeneous repolarization within the BZ may add a functional component aggravating re-entrant arrhythmias.
Purpose
We studied BZ heterogeneity and developed novel methodology for high resolution mapping of local in vivo activation-repolarization intervals (ARI) within the BZ and for studying the relation to cellular action potential (AP) profiles of cells isolated from the BZ.
Methods
Anterior-septal myocardial infarction was induced in 5 domestic pigs by 120-minute occlusion of the left anterior descending artery followed by reperfusion (18.9±4.7% of the left ventricle). After 1-month, electro-anatomical mapping was performed. Contact mapping was used to define the BZ (bipolar voltage 0.5–1.5mV). A non-contact recording of a 64-electrode array was translated to 2048 non-contact electrograms distributed over the LV. The non-contact electrograms were processed to determine the ARIs using a custom-made algorithm, validated against monophasic action potential recordings. After 2–4 days recovery, single cardiomyocytes were enzymatically isolated from the anterior-septal BZs and remote regions. Cardiomyocytes were field stimulated at 1Hz at 37°C and cellular AP duration (APD) was optically recorded (fluorescent voltage-sensitive dye Di-8-Annepps).
Results
In vivo, regional ARIs tended to be longer in the BZs than remote. ARI heterogeneity, quantified as the standard deviation of ARIs in a neighborhood of 1cm radius, was increased in the BZ (anterior BZ: 3.4±1.0 ms, P=0.052, septal BZ: 3.6±1.7 ms, P=0.027 vs remote: 2.0±0.5 ms). Cellular APD was measured in large population samples (>100 cells per region in each pig) and was longer in BZ myocytes compared to the remote region. Cellular APD heterogeneity, measured as the standard deviation within cell population samples pooled by region per animal, was increased in the BZ (anterior BZ: 105.9±17.0 ms, P=0.0010; septal BZ: 98.1±20.8 ms, P=0.0127 vs remote: 73.9±8.6 ms). Cell APD correlated to in vivo ARI (R2=0.34, P=0.021) and cellular heterogeneity correlated strongly with in vivo heterogeneity (R2=0.67, P=0.002).
Conclusion
In the BZ of MI, in vivo regional heterogeneity adds a functional substrate for re-entry that may result from heterogeneous cellular remodeling and increased cell-cell APD variability.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): KU Leuven BOF-C1 “Blood pressure induced premature ventricular beats as triggers for ventricular arrhythmia in ischemic cardiomyopathy”
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Affiliation(s)
- D Vermoortele
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
| | - M Amoni
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
| | - S Ingelaere
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
| | - P Holemans
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
| | - R Willems
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
| | - K Sipido
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
| | - P Claus
- KU Leuven, Department of Cardiovascular Sciences, Leuven, Belgium
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8
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Gilbert G, Demydenko K, Dries E, Puertas RD, Jin X, Sipido K, Roderick HL. Calcium Signaling in Cardiomyocyte Function. Cold Spring Harb Perspect Biol 2020; 12:cshperspect.a035428. [PMID: 31308143 DOI: 10.1101/cshperspect.a035428] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Rhythmic increases in intracellular Ca2+ concentration underlie the contractile function of the heart. These heart muscle-wide changes in intracellular Ca2+ are induced and coordinated by electrical depolarization of the cardiomyocyte sarcolemma by the action potential. Originating at the sinoatrial node, conduction of this electrical signal throughout the heart ensures synchronization of individual myocytes into an effective cardiac pump. Ca2+ signaling pathways also regulate gene expression and cardiomyocyte growth during development and in pathology. These fundamental roles of Ca2+ in the heart are illustrated by the prevalence of altered Ca2+ homeostasis in cardiovascular diseases. Indeed, heart failure (an inability of the heart to support hemodynamic needs), rhythmic disturbances, and inappropriate cardiac growth all share an involvement of altered Ca2+ handling. The prevalence of these pathologies, contributing to a third of all deaths in the developed world as well as to substantial morbidity makes understanding the mechanisms of Ca2+ handling and dysregulation in cardiomyocytes of great importance.
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Affiliation(s)
- Guillaume Gilbert
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
| | - Kateryna Demydenko
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
| | - Eef Dries
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
| | - Rosa Doñate Puertas
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
| | - Xin Jin
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
| | - Karin Sipido
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
| | - H Llewelyn Roderick
- Laboratory of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, BE3000 Leuven, Belgium
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9
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Holvoet P, Klocke B, Vanhaverbeke M, Menten R, Sinnaeve P, Raitoharju E, Lehtimäki T, Oksala N, Zinser C, Janssens S, Sipido K, Lyytikainen LP, Cagnin S. RNA-sequencing reveals that STRN, ZNF484 and WNK1 add to the value of mitochondrial MT-COI and COX10 as markers of unstable coronary artery disease. PLoS One 2019; 14:e0225621. [PMID: 31821324 PMCID: PMC6903720 DOI: 10.1371/journal.pone.0225621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 11/09/2019] [Indexed: 12/23/2022] Open
Abstract
Markers in monocytes, precursors of macrophages, which are related to CAD, are largely unknown. Therefore, we aimed to identify genes in monocytes predictive of a new ischemic event in patients with CAD and/or discriminate between stable CAD and acute coronary syndrome. We included 66 patients with stable CAD, of which 24 developed a new ischemic event, and 19 patients with ACS. Circulating CD14+ monocytes were isolated with magnetic beads. RNA sequencing analysis in monocytes of patients with (n = 13) versus without (n = 11) ischemic event at follow-up and in patients with ACS (n = 12) was validated with qPCR (n = 85). MT-COI, STRN and COX10 predicted new ischemic events in CAD patients (power for separation at 1% error rate of 0.97, 0.90 and 0.77 respectively). Low MT-COI and high STRN were also related to shorter time between blood sampling and event. COX10 and ZNF484 together with MT-COI, STRN and WNK1 separated ACS completely from stable CAD patients. RNA expressions in monocytes of MT-COI, COX10, STRN, WNK1 and ZNF484 were independent of cholesterol lowering and antiplatelet treatment. They were independent of troponin T, a marker of myocardial injury. But, COX10 and ZNF484 in human plaques correlated to plaque markers of M1 macrophage polarization, reflecting vascular injury. Expression of MT-COI, COX10, STRN and WNK1, but not that of ZNF484, PBMCs paired with that in monocytes. The prospective study of relation of MT-COI, COX10, STRN, WNK1 and ZNF484 with unstable CAD is warranted.
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Affiliation(s)
- Paul Holvoet
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- * E-mail:
| | | | | | - Roxane Menten
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Peter Sinnaeve
- Department of Clinical Cardiology, UZ Leuven, Leuven, Belgium
| | - Emma Raitoharju
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere, Finland
- Finnish Cardiovascular Research Centre, Faculty of Medicine and Life Sciences University of Tampere, Tampere, Finland
| | - Terho Lehtimäki
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere, Finland
- Finnish Cardiovascular Research Centre, Faculty of Medicine and Life Sciences University of Tampere, Tampere, Finland
| | - Niku Oksala
- Division of Vascular Surgery, Department of Surgery, Tampere University Hospital, Tampere, Finland
| | | | - Stefan Janssens
- Department of Clinical Cardiology, UZ Leuven, Leuven, Belgium
| | - Karin Sipido
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Leo-Pekka Lyytikainen
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere, Finland
- Finnish Cardiovascular Research Centre, Faculty of Medicine and Life Sciences University of Tampere, Tampere, Finland
| | - Stefano Cagnin
- Department of Biology, CRIBI Biotechnology Centre, Padova, Italy
- CIR-Myo Myology Centre, University of Padova, Padova, Italy
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Smyrnias I, Goodwin N, Wachten D, Skogestad J, Aronsen JM, Robinson EL, Demydenko K, Segonds-Pichon A, Oxley D, Sadayappan S, Sipido K, Bootman MD, Roderick HL. Contractile responses to endothelin-1 are regulated by PKC phosphorylation of cardiac myosin binding protein-C in rat ventricular myocytes. J Mol Cell Cardiol 2018; 117:1-18. [DOI: 10.1016/j.yjmcc.2018.02.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 02/02/2018] [Accepted: 02/16/2018] [Indexed: 01/07/2023]
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11
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Verbelen T, Claus P, Burkhoff D, Driesen RB, Kadur Nagaraju C, Verbeken E, Sipido K, Delcroix M, Rega F, Meyns B. Low-flow support of the chronic pressure-overloaded right ventricle induces reversed remodeling. J Heart Lung Transplant 2017; 37:151-160. [PMID: 29056459 DOI: 10.1016/j.healun.2017.09.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 07/25/2017] [Accepted: 09/26/2017] [Indexed: 10/18/2022] Open
Abstract
BACKGROUND Mechanical right ventricular (RV) support in pulmonary arterial hypertension patients has been feared to cause pulmonary hemorrhage and to be detrimental for the after-load-sensitive RV. Continuous low-flow pumps offer promise but remain insufficiently tested. METHODS The pulmonary artery was banded in 20 sheep in this study. Eight weeks later, a Synergy micro-pump (HeartWare International, Framingham MA) was inserted in 10 animals, driving blood from the right atrium to the pulmonary artery. After magnetic resonance imaging, hemodynamics and RV pressure-volume loop data were recorded. Eight weeks later, RV function was assessed in the same way, followed by histologic analysis of the ventricular tissue. RESULTS During the 8 weeks of support, RV volumes and central venous pressure decreased significantly, whereas RV contractility increased. Pulmonary artery pressure increased modestly, particularly its diastolic component. RV contribution to total right-sided cardiac output increased from 12 ± 12% to 41 ± 9% (p < 1 × 10-4). After pump inactivation, and compared with 8 weeks earlier, RV volumes had significantly decreased, tricuspid valve regurgitation had almost disappeared, and RV contractility had significantly increased, resulting in significantly increased RV forward power (0.25 ± 0.05 vs 0.16 ± 0.06 W, p = 0.014). Fulton index and RV myocyte size were significantly smaller, and without changes in fibrosis, when compared with controls. CONCLUSIONS Prolonged continuous low-flow RV mechanical support significantly unloads the chronic pressure-overloaded RV and improves cardiac output. After 8 weeks, RV hemodynamic recovery and reverse remodeling begin to occur, without increased fibrosis.
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Affiliation(s)
- Tom Verbelen
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium; Division of Experimental Cardiac Surgery, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium.
| | - Piet Claus
- Division of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Daniel Burkhoff
- Division of Cardiology, Columbia University College of Physicians and Surgeons, New York, New York, USA
| | - Ronald B Driesen
- Division of Experimental Cardiology, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Chandan Kadur Nagaraju
- Division of Experimental Cardiology, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Erik Verbeken
- Division of Translational Cell & Tissue Research, Department of Imaging & Pathology, University of Leuven, Leuven, Belgium
| | - Karin Sipido
- Division of Experimental Cardiology, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Marion Delcroix
- Respiratory Division, University Hospitals Leuven Leuven, Belgium; Department of Clinical and Experimental Medicine, University of Leuven, Leuven, Belgium
| | - Filip Rega
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium; Division of Experimental Cardiac Surgery, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Bart Meyns
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium; Division of Experimental Cardiac Surgery, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
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12
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Pries AR, Naoum A, Habazettl H, Dunkel M, Preissner R, Coats CJ, Tornada A, Orso F, Van de Werf F, Wood DA, Van de Werf F, Wood DA, O'Kelly S, Craven J, Coats A, Sipido K, De Backer D, Wallentin L, Hasenfuss G, della Sala L, Leggeri I, Wood DA, Van de Werf F, Jaarsma T, Elliott P, Pries AR, Madonna R, Kjeldsen K, Maggioni AP, Franco OH, Hills S, Pugliese F, De Bacquer D. CardioScape mapping the cardiovascular funding landscape in Europe. Eur Heart J 2017; 39:2423-2430. [DOI: 10.1093/eurheartj/ehx106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 03/07/2017] [Indexed: 11/13/2022] Open
Affiliation(s)
- Axel Radlach Pries
- Dean of Charité Universitätsmedizin Berlin, Charitéplatz 1, Berlin, Germany
| | - Anastasia Naoum
- European Society of Cardiology, Brussels Office, 29 Square de Meeûs, Brussels, Belgium
| | - Helmut Habazettl
- Institute of Physiology, Charité Universitätsmedizin Berlin, Virchowweg 6, Berlin, Germany
| | - Mathias Dunkel
- Charité Universitätsmedizin Berlin, Charitéplatz 1, Berlin, Germany
| | - Robert Preissner
- Institute of Physiology, Charité Universitätsmedizin Berlin, Virchowweg 6, Berlin, Germany
| | - Caroline J Coats
- Institute of Cardiovascular Science, University College, Gower Street, London, UK
| | - Ana Tornada
- Department of Medicine, Hospital de Cascais, Brigadeiro Victor Novais Gonçalves, Alcabideche, Cascais, Portugal
| | - Francesco Orso
- ANMCO Research Center, Via La Marmora 36, Florence, Italy
| | - Frans Van de Werf
- Department of Caridovascular Sciences, University of Leuven, O&N I Herestraat, Leuven, Belgium
| | - David A Wood
- National Heart and Lung Institute, Imperial College London, 59-61 North Wharf Road, London, UK
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13
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Sipido K, Degos L, Frackowiak R, Ganten D, Hofstraat H, Horvath I, Luyten F, Manns M, Oertel W, Zima T. Scientific Panel for Health: better research for better health. Lancet 2016; 388:865-6. [PMID: 27597458 DOI: 10.1016/s0140-6736(16)31426-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 07/26/2016] [Indexed: 11/17/2022]
Affiliation(s)
- Karin Sipido
- Department of Cardiovascular Sciences, Division of Experimental Cardiology, KU Leuven, B3000 Leuven, Belgium.
| | - Laurent Degos
- University Institute for Haematology, University of Paris Diderot, Hospital Saint Louis, Paris, France
| | - Richard Frackowiak
- Department of Clinical Neurosciences, CHUV University Hospital, University of Lausanne, Lausanne, Switzerland
| | | | | | - Ildiko Horvath
- National Koranyi Institute for TB and Pulmonology, Budapest, Hungary
| | - Frank Luyten
- Skeletal Biology and Engineering Research Centre, KU Leuven, B3000 Leuven, Belgium; University Hospitals UZ Leuven, Leuven, Belgium
| | - Michael Manns
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany
| | - Wolfgang Oertel
- Department of Neurology, Philipps University, Marburg, Germany
| | - Tomáš Zima
- Charles University in Prague, Prague, Czech Republic
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14
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Unsöld B, Kaul A, Sbroggiò M, Schubert C, Regitz-Zagrosek V, Brancaccio M, Damilano F, Hirsch E, Van Bilsen M, Munts C, Sipido K, Bito V, Detre E, Wagner NM, Schäfer K, Seidler T, Vogt J, Neef S, Bleckmann A, Maier LS, Balligand JL, Bouzin C, Ventura-Clapier R, Garnier A, Eschenhagen T, El-Armouche A, Knöll R, Tarone G, Hasenfuß G. Melusin protects from cardiac rupture and improves functional remodelling after myocardial infarction. Cardiovasc Res 2013; 101:97-107. [DOI: 10.1093/cvr/cvt235] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Abstract
Aims
Melusin is a muscle-specific chaperone protein whose expression is required for a compensatory hypertrophy response to pressure overload. Here, we evaluated the consequences of melusin overexpression in the setting of myocardial infarction (MI) using a comprehensive multicentre approach.
Methods and results
Mice overexpressing melusin in the heart (TG) and wild-type controls (WT) were subjected to permanent LAD ligation and both the acute response (Day 3) and subsequent remodelling (2 weeks) were examined. Mortality in wild-type mice was significant between Days 3 and 7, primarily due to cardiac rupture, but melusin's overexpression strongly reduced mortality (43.2% in wild-type vs. 27.3% in melusin-TG, P = 0.005). At Day 3 after MI, a time point preceding the mortality peak, TG hearts had increased heat shock protein 70 expression, increased ERK1/2 signalling, reduced cardiomyocyte hyper-contractility and inflammatory cell infiltrates, and increased matricellular protein expression in the infarcted area.
At 2 weeks after MI, melusin overexpression conferred a favourable adaptive remodelling characterized by reduced left ventricle dilatation and better preserved contractility in the presence of a comparable degree of hypertrophy. Adaptive remodelling in melusin TG mice was characterized by reduced apoptosis and fibrosis as well as increased cardiomyocyte contractility.
Conclusions
Consistent with its function as a chaperone protein, melusin overexpression exerts a dual protective action following MI reducing an array of maladaptive processes. In the early phase after MI, reduced inflammation and myocyte remodelling protect against cardiac rupture. Chronically, reduced myocyte loss and matrix remodelling, with preserved myocyte contractility, confer adaptive LV remodelling.
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Affiliation(s)
- Bernhard Unsöld
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Axel Kaul
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Mauro Sbroggiò
- Dipartimento di Biotecnologie Molecolari e Scienze per la Salute, Università di Torino, Turin, Italy
| | - Carola Schubert
- Institute of Gender in Medicine, Charité-Universitätsmedizin, Berlin, Germany
| | | | - Mara Brancaccio
- Dipartimento di Biotecnologie Molecolari e Scienze per la Salute, Università di Torino, Turin, Italy
| | - Federico Damilano
- Dipartimento di Biotecnologie Molecolari e Scienze per la Salute, Università di Torino, Turin, Italy
| | - Emilio Hirsch
- Dipartimento di Biotecnologie Molecolari e Scienze per la Salute, Università di Torino, Turin, Italy
| | - Marc Van Bilsen
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - Chantal Munts
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - Karin Sipido
- Division of Experimental Cardiology, Department of Cardiovascular Medicine, University of Leuven, Leuven, Belgium
| | - Virginie Bito
- Division of Experimental Cardiology, Department of Cardiovascular Medicine, University of Leuven, Leuven, Belgium
| | - Elke Detre
- Division of Experimental Cardiology, Department of Cardiovascular Medicine, University of Leuven, Leuven, Belgium
| | - Nana Maria Wagner
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Katrin Schäfer
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Tim Seidler
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Johannes Vogt
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Stefan Neef
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Annalen Bleckmann
- Department of Hematology and Oncology, University of Göttingen, Göttingen, Germany
| | - Lars S. Maier
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Jean Luc Balligand
- Pharmacology and Therapeutics, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
| | - Caroline Bouzin
- Pharmacology and Therapeutics, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
| | | | | | - Thomas Eschenhagen
- Department of Experimental Pharmacology and Toxicology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Ali El-Armouche
- Department of Pharmacology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
| | - Ralph Knöll
- Myocardial Genetics, Imperial College London, London, UK
| | - Guido Tarone
- Dipartimento di Biotecnologie Molecolari e Scienze per la Salute, Università di Torino, Turin, Italy
| | - Gerd Hasenfuß
- Department of Cardiology, University of Göttingen, Heart Research Center Göttingen, Göttingen, Germany
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15
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Hohendanner F, Ljubojević S, MacQuaide N, Sacherer M, Sedej S, Biesmans L, Wakula P, Platzer D, Sokolow S, Herchuelz A, Antoons G, Sipido K, Pieske B, Heinzel FR. Intracellular dyssynchrony of diastolic cytosolic [Ca²⁺] decay in ventricular cardiomyocytes in cardiac remodeling and human heart failure. Circ Res 2013; 113:527-38. [PMID: 23825358 DOI: 10.1161/circresaha.113.300895] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [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] [Indexed: 12/15/2022]
Abstract
RATIONALE Synchronized release of Ca²⁺ into the cytosol during each cardiac cycle determines cardiomyocyte contraction. OBJECTIVE We investigated synchrony of cytosolic [Ca²⁺] decay during diastole and the impact of cardiac remodeling. METHODS AND RESULTS Local cytosolic [Ca²⁺] transients (1-µm intervals) were recorded in murine, porcine, and human ventricular single cardiomyocytes. We identified intracellular regions of slow (slowCaR) and fast (fastCaR) [Ca²⁺] decay based on the local time constants of decay (TAUlocal). The SD of TAUlocal as a measure of dyssynchrony was not related to the amplitude or the timing of local Ca²⁺ release. Stimulation of sarcoplasmic reticulum Ca²⁺ ATPase with forskolin or istaroxime accelerated and its inhibition with cyclopiazonic acid slowed TAUlocal significantly more in slowCaR, thus altering the relationship between SD of TAUlocal and global [Ca²⁺] decay (TAUglobal). Na⁺/Ca²⁺ exchanger inhibitor SEA0400 prolonged TAUlocal similarly in slowCaR and fastCaR. FastCaR were associated with increased mitochondrial density and were more sensitive to the mitochondrial Ca²⁺ uniporter blocker Ru360. Variation in TAUlocal was higher in pig and human cardiomyocytes and higher with increased stimulation frequency (2 Hz). TAUlocal correlated with local sarcomere relengthening. In mice with myocardial hypertrophy after transverse aortic constriction, in pigs with chronic myocardial ischemia, and in end-stage human heart failure, variation in TAUlocal was increased and related to cardiomyocyte hypertrophy and increased mitochondrial density. CONCLUSIONS In cardiomyocytes, cytosolic [Ca²⁺] decay is regulated locally and related to local sarcomere relengthening. Dyssynchronous intracellular [Ca²⁺] decay in cardiac remodeling and end-stage heart failure suggests a novel mechanism of cellular contractile dysfunction.
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Affiliation(s)
- Felix Hohendanner
- Division of Cardiology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
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16
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Bourgonje VJA, Schoenmakers M, Beekman JDM, van der Nagel R, Houtman MJC, Miedema LF, Antoons G, Sipido K, de Windt LJ, van Veen TAB, Vos MA. Relevance of calmodulin/CaMKII activation for arrhythmogenesis in the AV block dog. Heart Rhythm 2012; 9:1875-83. [PMID: 22846339 DOI: 10.1016/j.hrthm.2012.07.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [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] [Received: 03/08/2012] [Indexed: 11/25/2022]
Abstract
BACKGROUND The calcium-dependent signaling molecules calcineurin and calcium/calmodulin-dependent protein kinase II (CaMKII) both have been linked to decompensated hypertrophy and arrhythmias. CaMKII is also believed to be involved in acute modulation of ion channels. OBJECTIVE The purpose of this study was to determine the role of calcineurin and CaMKII in a dog model of compensated hypertrophy and a long QT phenotype. METHODS AV block was created in dogs to induce ventricular remodeling, including enhanced susceptibility to dofetilide-induced torsades de pointes arrhythmias. Dogs were treated with cyclosporin A for 3 weeks, which reduced calcineurin activity, as determined by mRNA expression levels of regulator of calcineurin 1 exon 4, but which was unable to prevent structural, contractile, or electrical remodeling and arrhythmias. Biopsies were taken before and at 2 or 9 weeks after AV block. Western blots were performed against phosphorylated and total CaMKII, phospholamban, Akt, and histone deacetylase 4 (HDAC4). RESULTS Chronic AV block showed an increase in Akt, CaMKII and phospholamban phosphorylation levels, but HDAC4 phosphorylation remained unaltered. Dofetilide induced torsades de pointes in vivo and early afterdepolarizations in cardiomyocytes, and increased [Ca(2+)](i) and CaMKII autophosphorylation. Both W-7 and KN-93 treatment counteracted this. CONCLUSION The calcineurin pathway seems not to be involved in long-term cardiac remodeling of the chronic AV block dog. Although CaMKII is chronically activated, this does not translate to HDAC4 phosphorylation. However, acute CaMKII overactivation is able to initiate arrhythmias based on triggered activity.
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Affiliation(s)
- Vincent J A Bourgonje
- Department of Medical Physiology, Division Heart & Lungs, University Medical Center Utrecht, Utrecht, The Netherlands.
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17
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Livshitz L, Acsai K, Antoons G, Sipido K, Rudy Y. Data-based theoretical identification of subcellular calcium compartments and estimation of calcium dynamics in cardiac myocytes. J Physiol 2012; 590:4423-46. [PMID: 22547631 DOI: 10.1113/jphysiol.2012.228791] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
In cardiac cells, Ca(2+) release flux (J(rel)) via ryanodine receptors (RyRs) from the sarcoplasmic reticulum (SR) has a complex effect on the action potential (AP). Coupling between J(rel) and the AP occurs via L-type Ca(2+) channels (I(Ca)) and the Na(+)/Ca(2+) exchanger (I(NCX)). We used a combined experimental and modelling approach to study interactions between J(rel), I(Ca) and I(NCX) in porcine ventricular myocytes.We tested the hypothesis that during normal uniform J(rel), the interaction between these fluxes can be represented as occurring in two myoplasmic subcompartments for Ca(2+) distribution, one (T-space) associated with RyR and enclosed by the junctional portion of the SR membrane and corresponding T-tubular portion of the sarcolemma, the other (M-space) encompassing the rest of the myoplasm. I(Ca) and I(NCX) were partitioned into subpopulations in the T-space and M-space sarcolemma. We denoted free Ca(2+) concentrations in T-space and M-space Ca(t) and Ca(m), respectively. Experiments were designed to allow separate measurements of I(Ca) and I(NCX) as a function of J(rel). Inclusion of T-space in themodel allowed us to reproduce in silico the following important experimental results: (1) hysteresis of I(NCX) dependence on Ca(m); (2) delay between peak I(NCX) and peak Ca(m) during caffeine application protocol; (3) delay between I(NCX) and Ca(m) during Ca(2+)-induced-Ca(2+)-release; (4) rapid I(Ca) inactivation (within 2 ms) due to J(rel), with magnitude graded as a function of the SR Ca(2+) content; (5) time delay between I(Ca) inactivation due to J(rel) and Ca(m). Partition of 25% NCX in T-space and 75% in M-space provided the best fit to the experimental data. Measured Ca(m) and I(Ca) or I(NCX) were used as input to the model for estimating Ca(t). The actual model-computed Ca(t), obtained by simulating specific experimental protocols, was used as a gold standard for comparison. The model predicted peak Ca(t) in the range of 6–25 μM, with time to equilibrium of Ca(t) with Ca(m) of ~350 ms. These Ca(t) values are in the range of LCC and RyR sensitivity to Ca(2+). An increase of the SR Ca(2+) load increased the time to equilibrium. The I(Ca)-based estimation method was most accurate during the ascending phase of Ca(t). The I(NCX)-based method provided a good estimate for the descending phase of Ca(t). Thus, application of both methods in combination provides the best estimate of the entire Ca(t) time course.
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Affiliation(s)
- Leonid Livshitz
- Cardiac Bioelectricity and Arrhythmia Centre, Washington University in St Louis, St Louis, MO 63130-4899, USA
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18
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Heinzel FR, Hohendanner F, Macquaide N, Sacherer M, Antoon G, Sipido K, Pieske B. Intracellular Dyssynchrony in Calcium Removal in Ventricular Cardiac Myocytes. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.3011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Smith U, Sipido K, Dive C, Nicod L. A new Alliance: biomedical societies in Europe unite to support research. Eur Heart J 2011; 32:2224-4a. [PMID: 22026010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
After years of stagnant finances for research, moves are under way to increase research funds in Europe.
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Smith U, Sipido K, Dive C, Nicod L. Alliance for biomedical research in Europe. EMBO Mol Med 2011; 3:505-6. [PMID: 21826794 PMCID: PMC3377096 DOI: 10.1002/emmm.201100162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- Ulf Smith
- Sahlgrenska University Hospital, Gothenburg, Sweden.
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Tada H, Yamasaki H, Sekiguchi Y, Igarashi M, Kuroki K, Machino T, Yoshida K, Aonuma K, Heinzel FR, Forstner H, Lercher P, Bisping E, Rotman B, Fruhwald FM, Pieske BM, Dabrowski R, Kowalik I, Borowiec A, Smolis-Bak E, Trybuch A, Sosnowski C, Szwed H, Baturova MA, Lindgren A, Shubik YV, Olsson B, Platonov PG, Van Den Broek KC, Denollet J, Widdershoven J, Kupper N, Allam R, Allam RAGAB, Galal WAGDY, El-Damnhoury HAYAM, Mortada AYMAN, Jimenez-Candil J, Martin A, Hernandez J, Martin F, Gallego M, Martin-Luengo C, Quintanilla JG, Moreno Planas J, Molina-Morua R, Archondo T, Garcia-Torrent MJ, Perez-Castellano N, Macaya C, Perez-Villacastin J, Saiz J, Tobon C, Rodriguez JF, Hornero F, Ferrero JM, Ito K, Date T, Kawai M, Hioki M, Narui R, Matsuo S, Yoshimura M, Yamane T, Tabatabaei N, Lin G, Powell BD, Smairat R, Glockner JF, Brady PA, Fichtner S, Czudnochowsky U, Estner H, Reents T, Jilek C, Ammar S, Hessling G, Deisenhofer I, Shah DC, Kautzner J, Saoudi N, Herrera C, Jais P, Hindricks G, Neuzil P, Kuck KH, Wong KCK, Jones M, Qureshi N, Muthumala A, Betts TR, Bashir Y, Rajappan K, Vogtmann T, Wagner M, Schurig J, Hein P, Hamm B, Baumann G, Lembcke A, Saad B, Piwowarska W, Nessler J, Edvardsson N, Rieger G, Garutti C, Linker N, Jorge C, Silva Marques J, Veiga A, Cruz J, Slater C, Correia MJ, Sousa J, Miltenberger-Miltenyi G, Nunes Diogo A, Matic D, Mrdovic I, Stankovic G, Asanin M, Antonijevic N, Matic M, Oliveira LA, Kocev N, Vasiljevic Z, Ramirez-Marrero MA, Perez-Villardon B, Delgado-Prieto JL, Jimenez-Navarro M, De Teresa-Galvan E, De Mora-Martin M, Pietrucha AZ, Bzukala I, Elias R, Sztefko K, Wnuk M, Malek A, Piwowarska W, Nessler J, Szili-Torok T, Bauernfeind T, De Groot N, Shalganov T, Schalij M, Camiletti A, Jordaens L, Rivas N, Casaldaliga J, Roca I, Pijuan A, Perez-Rodon J, Dos L, Garcia-Dorado D, Moya A, Baruteau AE, Moura D, Behaghel A, Chatel S, Mabo P, Schott JJ, Daubert JC, Le Marec H, Probst V, Zorio Grima E, Navarro-Manchon J, Molina P, Maldonado P, 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Doevendans PA, Meine M, Thibault B, Dubuc M, Karst E, Ryu K, Paiement P, Farazi T, Puetz V, Berndt C, Buchholz J, Dorszewski A, Mornos C, Cozma D, Ionac A, Petrescu L, Mornos A, Pescariu S, Puetz V, Berndt C, Buchholz J, Dorszewski A, Benser M, Roscoe G, De Jong S, Roberts G, Boileau P, Rec A, Ryu K, Folman C, Morttada A, Abd El Kader M, Samir R, Roushdy R, Khaled S, Abo El Maaty M, Van Gelder B, Houthuizen P, Bracke FA, Osca Asensi J, Tejada D, Sanchez JM, Munoz B, Cano O, Rodriguez M, Sancho-Tello MJ, Olague J, Hou W, Rosenberg S, Koh S, Poore J, Snell J, Yang M, Nirav D, Bornzin G, Deering T, Dan D, Wickliffe AC, Cazeau S, Karimzadeh K, Mukerji S, Loghin C, Kantharia B, Bogaard MD, Leenders GE, Maskara B, Tuinenburg AE, Loh P, Hauer RN, Doevendans PA, Meine M, Betts TR, Jones MA, Wong KCK, Qureshi N, Rajappan K, Bashir Y, Lamba J, Simpson CS, Redfearn DP, Michael KA, Fitzpatrick M, Baranchuk A, Heinke M, Ismer B, Kuehnert H, Surber R, Haltenberger AM, Prochnau D, Figulla HR, Delarche N, Bizeau O, Couderc P, Chapelet A, Amara W, Lazarus A, Kubus P, Krupickova S, Gebauer RA, Janousek J, Van Deursen CJM, Strik M, Vernooy K, Van Hunnik A, Kuiper M, Crijns HJGM, Prinzen FW, Islam N, Gras D, Abraham W, Calo L, Birgersdotter-Green U, Clyne C, Herre J, Sheppard R, Abraham W, Gras D, Birgersdotter-Green U, Calo L, Clyne C, Klein N, Herre J, Sheppard R, Kowalski O, Lenarczyk R, Pruszkowska P, Sokal A, Kukulski T, Zielinska T, Pluta S, Kalarus Z, Schwab JO, Gasparini M, Anselme F, Clementy J, Santini M, Martinez Ferrer J, Burrone V, Santi E, Nevzorov R, Porter A, Kusniec J, Golovchiner G, Ben-Gal T, Strasberg B, Haim M, Rordorf R, Savastano S, Sanzo A, Vicentini A, Petracci B, De Amici M, Striuli L, Landolina M, Tolosana JM, Martin AM, Hernandez-Madrid A, Macias A, Fernandez-Lozano I, Osca J, Quesada A, Mont L, Igarashi M, Tada H, Yamasaki H, Sekiguchi Y, Kuroki K, Yoshida K, Noguchi Y, Aonuma K, Shahrzad S, Karim Soleiman N, Tavoosi A, Taban S, Emkanjoo Z, Fukunaga M, Goya M, Hiroshima K, Ohe M, Hayashi K, Iwabuchi M, Nosaka H, Nobuyoshi M, Doiny D, Perez-Silva A, Castrejon Castrejon S, Estrada A, Ortega M, Lopez-Sendon JL, Merino JL, Garcia Fernandez FJ, Gallardo R, Pachon M, Almendral J, Gonzalez Torrecilla E, Martin J, Yahya D, Al-Mogheer B, Gouda S, Eweis E, El Ramly M, Abdelwahab A, Kassenberg W, Wittkampf FHM, Hof IE, Heijden JH, Neven KGEJ, Meine M, Hauer RNW, Loh P, Baratto F, Bignami E, Pappalardo F, Maccabelli G, Nicolotti D, Zangrillo A, Della Bella P, Hayashi K, Goya M, Hiroshima K, Nagashima M, An Y, Fukunaga M, Okreglicki A, Russouw C, Tilz R, Yoshiga Y, Mathew S, Fuernkranz A, Rillig A, Wissner E, Kuck KH, Ouyang F, De Sisti A, Tonet J, Gueffaf F, Amara W, Touil F, Aouate P, Hidden-Lucet F, Doiny D, Castrejon Castrejon S, Estrada A, Ortega M, Perez-Silva A, Lopez-Sendon JL, Merino JL, Makimoto H, Satomi K, Yamada Y, Okamura H, Noda T, Shimizu W, Aihara N, Kamakura S, Estrada A, Perez Silva A, Doiny D, Castrejon S, Gonzalez Vasserot M, Merino JL, Tilz R, Senges J, Brachmann J, Andresen D, Hoffmann E, Schumacher B, Willems S, Kuck KH, Reents T, Deisenhofer I, Ammar S, Springer B, Fichtner S, Jilek C, Kolb C, Hessling G, Akca F, Bauernfeind T, De Groot NMS, Schwagten B, Witsenburg M, Jordaens L, Szili-Torok T, Hata Y, Nakagami R, Watanabe T, Sato A, Watanabe H, Kabutoya T, Mituhashi T, Theuns DAMJ, Smith T, Pedersen SS, Dabiri-Abkenari L, Jordaens L, Prull MW, Unverricht S, Bittlinsky A, Wirdemann H, Sasko B, Wirdeier S, Trappe HJ, Zorio Grima E, Rueda J, Medina P, Jaijo T, Sevilla T, Osca J, Arnau MA, Salvador A, Starrenburg AH, Kraaier K, Pedersen SS, Scholten MF, Van Der Palen J, De Haan S, Commandeur J, De Boer K, Beek AM, Van Rossum AC, Allaart CP, Berne P, Porres JM, Fernandez-Lozano I, Arnaiz JA, Mont L, Berruezo A, Brugada R, Brugada J, Man S, Maan AC, Thijssen J, Van Der Wall EE, Schalij MJ, Burattini L, Burattini R, Swenne CA, Bonny A, Hidden-Lucet F, Ditah I, Larrazet F, Frank R, Fontaine G, Van Den Broek KC, Pedersen SS, Theuns DAMJ, Jordaens L, Van Der Voort PH, Alings M, Denollet J, Shimane A, Okajima K, Kanda G, Yokoi K, Yamada S, Taniguchi Y, Hayashi T, Kajiya T, Santos MC, Wright J, Betts J, Denman R, Dominguez-Perez L, Arias Palomares MA, Toquero J, Jimenez-Candil J, Olague J, Diaz-Infante E, Tercedor L, Valverde I, Miracle Blanco AL, Datino Romaniega T, Arenal Maiz A, Atienza Fernandez F, Gonzalez Torrecilla E, Eidelman G, Hernandez Hernandez J, Fernandez Aviles F, Napp A, Joosten S, Stunder D, Zink M, Marx N, Schauerte P, Silny J, Trucco ME, Arce M, Palazzolo J, Femenia F, Glad JM, Szymkiewicz SJ, Glad JM, Szymkiewicz SJ, Fernandez-Armenta J, Camara O, Mont LL, Andreu D, Diaz E, Silva E, Frangi A, Berruezo A, Brembilla-Perrot B, Laporte F, Jimenez-Candil J, Martin A, Gallego M, Morinigo J, Ledesma C, Martin-Luengo C, Hadid C, Almendral J, Ortiz M, Quesada A, Wolpert C, Cobo E, Navarro X, Arribas F, Miki Y, Naitoh S, Kumagai K, Goto K, Kaseno K, Oshima S, Taniguchi K, Rivera S, Scazzuso F, Albina G, Klein A, Laino R, Sammartino V, Giniger A, Fukumoto K, Takatsuki S, Kimura T, Nishiyama N, Aizawa Y, Sato T, Miyoshi S, Fukuda K, Muggenthaler M, Raju H, Papadakis M, Chandra N, Bastiaenen R, Behr ER, Sharma S, Samniah N, Radezishvsky Y, Omari H, Rosenschein U, Perez Riera AR, Ferreira M, Hopman WM, Mcintyre WF, Baranchuk AR, Wongcharoen W, Keanprasit K, Phrommintikul A, Chaiwarith R, Yagishita A, Hachiya H, Nakamura T, Tanaka Y, Higuchi K, Kawabata M, Hirao K, Isobe M, Havranek S, Simek J, Wichterle D, Stoickov V, Ilic S, Deljanin Ilic M, Aagaard P, Sahlen A, Bergfeldt L, Braunschweig F, Sousa A, Lebreiro A, Sousa C, Oliveira S, Correia AS, Rangel I, Freitas J, Maciel MJ, Asensio Lafuente E, Aguilera AAC, Corral MACC, Mendoza KLMC, Nava PEND, Rendon ALRC, Villegas LVC, Castillo LCM, Schaerf R, Develle R, Brembilla-Perrot B, Oliver C, Zinzius PY, Providencia RA, Botelho A, Trigo J, Nascimento J, Quintal N, Mota P, Leitao-Marques AM, Borbola J, Abraham P, Foldesi CS, Kardos A, Miranda R, Almeida S, Santos MB, Cavaco D, Quaresma R, Morgado FB, Adragao P, Fatemi M, Didier R, Le Gal G, Etienne Y, Jobic Y, Gilard M, Boschat J, Mansourati J, Zubaid M, Rashed W, Alsheikh-Ali A, Almahmeed W, Shehab A, Sulaiman K, Asaad N, Amin H, Boersma LVA, Swaans M, Post M, Rensing B, Jarverud K, Broome M, Noren K, Svensson T, Hjelm S, Hollmark M, Bjorling A, Providencia RA, Botelho A, Trigo J, Nascimento J, Quintal N, Mota P, Leitao-Marques AM, Maeda K, Takagi M, Suzuki K, Tatsumi H, Yoshiyama M, Simeonidou E, Michalakeas C, Kastellanos S, Varounis C, Nikolopoulou A, Koniari C, Anastasiou-Nana M, Furukawa T, Maggi R, Bertolone C, Fontana D, Brignole M, Pietrucha AZ, Wnuk M, Bzukala I, Mroczek-Czernecka D, Konduracka E, Kruszelnicka O. Poster Session 4. Europace 2011. [DOI: 10.1093/europace/eur231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Heinzel FR, MacQuaide N, Biesmans L, Sipido K. Dyssynchrony of Ca2+ release from the sarcoplasmic reticulum as subcellular mechanism of cardiac contractile dysfunction. J Mol Cell Cardiol 2010; 50:390-400. [PMID: 21075114 DOI: 10.1016/j.yjmcc.2010.11.008] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2010] [Revised: 09/30/2010] [Accepted: 11/05/2010] [Indexed: 02/05/2023]
Abstract
Cardiac contractile function depends on coordinated electrical activation throughout the heart. Dyssynchronous electrical activation of the ventricles has been shown to contribute to contractile dysfunction in heart failure, and resynchronization therapy has emerged as a therapeutic concept. At the cellular level, coupling of membrane excitation to myofilament contraction is facilitated by highly organized intracellular structures which coordinate Ca(2+) release. The cytosolic [Ca(2+)] transient triggered by depolarization-induced Ca(2+) influx is the result of a gradable and robust high gain process, Ca(2+)-induced Ca(2+) release (CICR), which integrates subcellular localized Ca(2+) release events. Lack of synchronization of these localized release events can contribute to contractile dysfunction in myocardial hypertrophy and heart failure. Different underlying mechanisms relate to functional and structural changes in sarcolemmal Ca(2+) channels, the sarcoplasmic Ca(2+) release channel or ryanodine receptor, RyR, their intracellular arrangement in close proximity in couplons and the loss of t-tubules. Dyssynchrony at the subcellular level translates in a reduction of the overall gain of CICR at the cellular level and forms an important determinant of myocyte contractility in heart failure.
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C, Antoniades C, Antonopoulos A, Tousoulis D, Miliou A, Triantafyllou C, Channon K, Stefanadis C, Masson W, Siniawski D, Sorroche P, Casanas L, Scordo W, Krauss J, Cagide A, Schuchardt M, Toelle M, Huang T, Wiedon A, Van Der Giet M, Chin-Dusting J, Lee S, Walker K, Dart A, O'dea K, Skilton M, Perez Berbel P, Arrarte Esteban V, Garcia Valentin M, Sola Villalpando M, Lopez Vaquero C, Caballero L, Quintanilla Tello M, Sogorb Garri F, Duerr G, Elhafi N, Bostani T, Swieny L, Kolobara E, Welz A, Roell W, Dewald O, Kaludercic N, Takimoto E, Nagayama T, Chen K, Shih J, Kass D, Di Lisa F, Paolocci N, Vinet L, Pezet M, Briec F, Previlon M, Rouet-Benzineb P, Hivonnait A, Charpentier F, Mercadier J, Villar A, Cobo M, Llano M, Montalvo C, Exposito V, Nistal J, Hurle M, Ruifrok W, Meems L. Saturday, 17 July 2010. Cardiovasc Res 2010. [DOI: 10.1093/cvr/cvq174] [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: 11/14/2022] Open
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Rutkovskiy A, Mariero L, Stenslokken K, Valen G, Vaage J, Dizayee S, Kaestner S, Kuck F, Piekorz R, Hein P, Matthes J, Nurnberg B, Herzig S, Hertel F, Switalski A, Bender K, Kienitz MC, Pott L, Fornai L, Angelini A, Erika Amstalden Van Hove E, Fedrigo M, Thiene G, Heeren R, Kruse M, Pongs O, Lehmann H, Martens-Lobenhoffer J, Hammwoehner M, Roehl F, Bukowska A, Bode-Boeger S, Goette A, Radicke S, Cotella C, Sblattero D, Schaefer M, Ravens U, Wettwer E, Santoro C, Seyler C, Kulzer M, Zitron E, Scholz E, Welke F, Thomas D, Karle C, Schmidt K, Radicke S, Dobrev D, Ravens U, Wettwer E, Houshmand N, Menesi D, Ravens U, Wettwer E, Cotella D, Papp J, Varro A, Szuts V, Szuts V, Houshmand N, Puskas L, Jost N, Virag L, Kiss I, Deak F, Varro A, Tereshchenko S, Gladyshev M, Kalachova G, Syshchik N, Gogolashvili N, Dedok E, Evert L, Wenzel J, Brandenburger M, Bogdan R, Richardt D, Reppel M, Hescheler J, Dendorfer A, Terlau H, Wiegerinck R, Galvez-Monton C, Jorge E, Martinez R, Ricart E, Cinca J, Bagavananthem Andavan G, Lemmens Gruber R, Brack K, Coote J, Ng G, Daimi H, Haj Khelil A, Neji A, Ben Hamda K, Maaoui S, Aranega A, Chibani J, Franco Jaime D, Tanko AS, Brack K, Coote J, Ng G, Doisne N, Hivert B, Cosnay P, Findlay I, Maupoil V, Daniel JM, Bielenberg W, Stieger P, Tillmanns H, Sedding D, Fortini C, Toffoletto B, Fucili A, Beltrami A, Fiorelli V, Francolini G, Ferrari R, Beltrami C, Castellani C, Ravara B, Tavano R, Thiene G, Vettor R, De Coppi P, Papini E, Angelini A, Molla F, Soldo A, Biondi A, Staszewsky L, Russo I, Gunetti M, Fagioli F, Latini R, Suffredini S, Sartiani L, Stillitano F, Mugelli A, Cerbai E, Krausgrill B, Halbach M, Soemantri S, Schenk K, Lange N, Hescheler J, Saric T, Muller-Ehmsen J, Kavanagh D, Zhao Y, Yemm A, Kalia N, Wright E, Farrell K, Wallrapp C, Geigle P, Lewis A, Stratford P, Malik N, Holt C, Krausgrill B, Raths M, Halbach M, Schenk K, Hescheler J, Muller-Ehmsen J, Zagallo M, Luni C, Serena E, Cimetta E, Zatti S, Giobbe G, Elvassore N, Serena E, Cimetta E, Zaglia T, Zatti S, Zambon A, Gordon K, Elvassore N, Mioulane M, Foldes G, Ali N, Harding S, Gorbe A, Szunyog A, Varga Z, Pirity M, Rungaruniert S, Dinnyes A, Csont T, Ferdinandy P, Foldes G, Mioulane M, Iqbal A, Schneider MD, Ali N, Harding S, Babes E, Babes V, Khodjaeva E, Ibadov R, Khalikulov K, Mansurov A, Astvatsatryan A, Senan M, Astvatsatryan A, Senan M, Nemeth A, Lenkey Z, Ajtay Z, Cziraki A, Sulyok E, Horvath I, Lobenhoffer J, Bode-Boger S, Li J, He Y, Yang X, Wang F, Xu H, Li X, Zhao X, Lin Y, Juszynski M, Ciszek B, Jablonska A, Stachurska E, Ratajska A, Atkinson A, Inada S, Li J, Sleiman R, Zhang H, Boyett M, Dobrzynski H, Fedorenko O, Hao G, Atkinson A, Yanni J, Buckley D, Anderson R, Boyett M, Dobrzynski H, Ma Y, Ma X, Hu Y, Yang Y, Huang D, Liu F, Huang Y, Liu C, Jedrzejczyk T, Balwicki L, Wierucki L, Zdrojewski T, Makhro A, Agarkova I, Vogel J, Gassmann M, Bogdanova A, Korybalska K, Pyda M, Witowski J, Ibatov A, Sozmen N, Seymen A, Tuncay E, Turan B, Huang Y, Ma Y, Yang Y, Liu F, Chen B, Li X, Houston-Feenstra L, Chiong JR, Jutzy K, Furundzija V, Kaufmann J, Kappert K, Meyborg H, Fleck E, Stawowy P, Ksiezycka-Majczynska E, Lubiszewska B, Kruk M, Kurjata P, Ruzyllo W, Ibatov A, Driesen R, Coenen T, Fagard R, Sipido K, Petrov V, Aksentijevic D, Lygate C, Makinen K, Sebag-Montefiore L, Medway D, Schneider J, Neubauer S, Gasser R, Holzwart E, Rainer P, Von Lewinski D, Maechler H, Gasser S, Roessl U, Pieske B, Krueger J, Kintscher U, Kappert K, Podramagi T, Paju K, Piirsoo A, Roosimaa M, Kadaja L, Orlova E, Ruusalepp A, Seppet E, Auquier J, Ginion A, Hue L, Horman S, Beauloye C, Vanoverschelde J, Bertrand L, Fekete V, Zvara A, Pipis J, Konya C, Csonka C, Puskas L, Csont T, Ferdinandy P, Gasser S, Rainer P, Holzwart E, Roessl U, Kraigher-Krainer E, Von Lewinksi D, Pieske B, Gasser R, Gonzalez-Loyola A, Barba I, Rodriguez-Sinovas A, Fernandez-Sanz C, Agullo E, Ruiz-Meana M, Garcia-Dorado D, Forteza M, Bodi Peris V, Monleon D, Mainar L, Morales J, Moratal D, Trapero I, Chorro F, Leszek P, Sochanowicz B, Szperl M, Kolsut P, Piotrowski W, Rywik T, Danko B, Kruszewski M, Stanley W, Khairallah R, Khanna N, O'shea K, Kristian T, Hecker P, Des Rosiers R, Fiskum G, Fernandez-Alfonso M, Guzman-Ruiz R, Somoza B, Gil-Ortega M, Attane C, Castan-Laurell I, Valet P, Ruiz-Gayo M, Maroz-Vadalazhskaya N, Denissevich T, Shumavetz V, Ostrovskiy Y, Schrepper A, Schwarzer M, Amorim P, Schoepe M, Mohr F, Doenst T, Chiellini G, Ghelardoni S, Saba A, Marchini M, Frascarelli S, Raffaelli A, Scanlan T, Zucchi R, Van Den Akker N, Molin D, Kolk F, Jeukens F, Olde Engberink R, Waltenberger J, Post M, Van Den Akker N, Molin D, Verbruggen S, Schulten H, Post M, Waltenberger J, Rochais F, Kelly R, Aberg M, Johnell M, Wickstrom M, Siegbahn A, Dimitrakis P, Groppalli V, Ott D, Seifriz F, Suter T, Zuppinger C, Kashcheyeu Y, Mueller R, Wiesen M, Saric T, Gruendemann D, Hescheler J, Herzig S, Falcao-Pires I, Fontes-Sousa A, Lopes-Conceicao L, Bras-Silva C, Leite-Moreira A, Bukauskas F, Palacios-Prado N, Norheim F, Raastad T, Thiede B, Drevon C, Haugen F, Lindner D, Westermann D, Zietsch C, Schultheiss HP, Tschoepe C, Horn M, Graham H, Hall M, Richards M, Clarke J, Dibb K, Trafford A, Cheng CF, Lin H, Eigeldiger-Berthou S, Buntschu P, Frobert A, Flueck M, Tevaearai H, Kadner A, Mikhailov A, Torrado M, Centeno A, Lopez E, Lourido L, Castro Beiras A, Popov T, Srdanovic I, Petrovic M, Canji T, Kovacevic M, Jovelic A, Sladojevic M, Panic G, Kararigas G, Fliegner D, Regitz-Zagrosek V, De La Rosa Sanchez A, Dominguez J, Sedmera D, Franco D, Aranega A, Medunjanin S, Burgbacher F, Schmeisser A, Strasser R, Braun-Dullaeus R, Li X, Ma Y, Yang Y, Liu F, Han W, Chen B, Zhang J, Gao X, Bayliss C, Song W, Stuckey D, Dyer E, Leung MC, Monserrat L, Marston S, Sorriento D, Santulli G, Fusco A, Trimarco B, Iaccarino G, Revnic C, Ginghina C, Revnic F, Paillard M, Liang J, Strub G, Gomez L, Hait N, Allegood J, Lesnefsky E, Spiegel S, Zuchi C, Coiro S, Bettini M, Ciliberti G, Mancini I, Tritto I, Becker L, Ambrosio G, Adam T, Sharp S, Opie L, Lecour S, Khaliulin I, Parker J, Halestrap A, Kandasamy A, Schulz R, Schoepe M, Schwarzer M, Schrepper A, Osterholt M, Amorim P, Mohr F, Doenst T, Fernandez-Sanz C, Ruiz-Meana M, Miro-Casas E, Agullo E, Boengler K, Schulz R, Garcia-Dorado D, Menazza S, Canton M, Sheeran F, Di Lisa F, Pepe S, Borchi E, Manni M, Bargelli V, Giordano C, D'amati G, Cerbai E, Nediani C, Raimondi L, Micova P, Balkova P, Kolar F, Neckar J, Novak F, Novakova O, Schuchardt M, Toelle M, Pruefer N, Pruefer J, Jankowski V, Jankowski J, Van Der Giet M, Han W, Su Y, Zervou S, Aksentijevic D, Lygate C, Neubauer S, Seidel B, Korkmaz S, Radovits T, Hirschberg K, Loganathan S, Barnucz E, Karck M, Szabo G, Aggeli I, Kefaloyianni E, Beis I, Gaitanaki C, Lacerda L, Somers S, Opie L, Lecour S, Brack K, Coote J, Ng G, Paur H, Nikolaev V, Lyon A, Harding S, Bras-Silva C. Sunday, 18 July 2010. Cardiovasc Res 2010. [DOI: 10.1093/cvr/cvq176] [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: 11/13/2022] Open
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Biesmans L, Bito V, Vinet L, Rouet-Benzineb P, Mercadier JJ, Sipido K. FKBP12.6 Overexpression Blunts Cardiomyocyte Remodeling After Left-ventricular Pressure-overload. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Pokreisz P, Vandenwijngaert S, Bito V, Van den Bergh A, Lenaerts I, Busch C, Marsboom G, Gheysens O, Vermeersch P, Biesmans L, Liu X, Gillijns H, Pellens M, Van Lommel A, Buys E, Schoonjans L, Vanhaecke J, Verbeken E, Sipido K, Herijgers P, Bloch KD, Janssens SP. Ventricular phosphodiesterase-5 expression is increased in patients with advanced heart failure and contributes to adverse ventricular remodeling after myocardial infarction in mice. Circulation 2009; 119:408-16. [PMID: 19139381 DOI: 10.1161/circulationaha.108.822072] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Ventricular expression of phosphodiesterase-5 (PDE5), an enzyme responsible for cGMP catabolism, is increased in human right ventricular hypertrophy, but its role in left ventricular (LV) failure remains incompletely understood. We therefore measured LV PDE5 expression in patients with advanced systolic heart failure and characterized LV remodeling after myocardial infarction in transgenic mice with cardiomyocyte-specific overexpression of PDE5 (PDE5-TG). METHODS AND RESULTS Immunoblot and immunohistochemistry techniques revealed that PDE5 expression was greater in explanted LVs from patients with dilated and ischemic cardiomyopathy than in control hearts. To evaluate the impact of increased ventricular PDE5 levels on cardiac function, PDE5-TG mice were generated. Confocal and immunoelectron microscopy revealed increased PDE5 expression in cardiomyocytes, predominantly localized to Z-bands. At baseline, myocardial cGMP levels, cell shortening, and calcium handling in isolated cardiomyocytes and LV hemodynamic measurements were similar in PDE5-TG and wild-type littermates. Ten days after myocardial infarction, LV cGMP levels had increased to a greater extent in wild-type mice than in PDE5-TG mice (P<0.05). Ten weeks after myocardial infarction, LV end-systolic and end-diastolic volumes were larger in PDE5-TG than in wild-type mice (57+/-5 versus 39+/-4 and 65+/-6 versus 48+/-4 muL, respectively; P<0.01 for both). LV systolic dysfunction and diastolic dysfunction were more marked in PDE5-TG than in wild-type mice, associated with enhanced hypertrophy and reduced contractile function in isolated cardiomyocytes from remote myocardium. CONCLUSIONS Increased PDE5 expression predisposes mice to adverse LV remodeling after myocardial infarction. Increased myocardial PDE5 expression in patients with advanced cardiomyopathy may contribute to the development of heart failure and represents an important therapeutic target.
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Affiliation(s)
- Peter Pokreisz
- Vesalius Research Center, Flanders Institute for Biotechnology, Leuven, Belgium
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Heinzel FR, Bito V, Biesmans L, Wu M, Detre E, von Wegner F, Claus P, Dymarkowski S, Maes F, Bogaert J, Rademakers F, D'hooge J, Sipido K. Remodeling of T-tubules and reduced synchrony of Ca2+ release in myocytes from chronically ischemic myocardium. Circ Res 2007; 102:338-46. [PMID: 18079411 DOI: 10.1161/circresaha.107.160085] [Citation(s) in RCA: 184] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In ventricular cardiac myocytes, T-tubule density is an important determinant of the synchrony of sarcoplasmic reticulum (SR) Ca2+ release and could be involved in the reduced SR Ca2+ release in ischemic cardiomyopathy. We therefore investigated T-tubule density and properties of SR Ca2+ release in pigs, 6 weeks after inducing severe stenosis of the circumflex coronary artery (91+/-3%, N=13) with myocardial infarction (8.8+/-2.0% of total left ventricular mass). Severe dysfunction in the infarct and adjacent myocardium was documented by magnetic resonance and Doppler myocardial velocity imaging. Myocytes isolated from the adjacent myocardium were compared with myocytes from the same region in weight-matched control pigs. T-tubule density quantified from the di-8-ANEPPS (di-8-butyl-amino-naphthyl-ethylene-pyridinium-propyl-sulfonate) sarcolemmal staining was decreased by 27+/-7% (P<0.05). Synchrony of SR Ca2+ release (confocal line scan images during whole-cell voltage clamp) was reduced in myocardium myocytes. Delayed release (ie, half-maximal [Ca2+]i occurring later than 20 ms) occurred at 35.5+/-6.4% of the scan line in myocardial infarction versus 22.7+/-2.5% in control pigs (P<0.05), prolonging the time to peak of the line-averaged [Ca2+]i transient (121+/-9 versus 102+/-5 ms in control pigs, P<0.05). Delayed release colocalized with regions of T-tubule rarefaction and could not be suppressed by activation of protein kinase A. The whole-cell averaged [Ca2+]i transient amplitude was reduced, whereas L-type Ca2+ current density was unchanged and SR content was increased, indicating a reduction in the gain of Ca2+-induced Ca2+ release. In conclusion, reduced T-tubule density during ischemic remodeling is associated with reduced synchrony of Ca2+ release and reduced efficiency of coupling Ca2+ influx to Ca2+ release.
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Affiliation(s)
- Frank R Heinzel
- Division of Experimental Cardiology, University Hospital Gasthuisberg and University of Leuven, Belgium
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Umans L, Cox L, Tjwa M, Bito V, Vermeire L, Laperre K, Sipido K, Moons L, Huylebroeck D, Zwijsen A. Inactivation of Smad5 in endothelial cells and smooth muscle cells demonstrates that Smad5 is required for cardiac homeostasis. Am J Pathol 2007; 170:1460-72. [PMID: 17456754 PMCID: PMC1854943 DOI: 10.2353/ajpath.2007.060839] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Smads are intracellular signaling proteins that transduce signals elicited by members of the transforming growth factor (TGF)-beta superfamily. Smad5 and Smad1 are highly homologous, and they mediate primarily bone morphogenetic protein (Bmp) signals. We used the Cre-loxP system and Sm22-Cre and Tie-1-Cre mice to study the function of Smad5 in the developing blood vessel wall. Analysis of embryos demonstrated that deletion of Smad5 in endothelial or smooth muscle cells resulted in a normal organization of embryonic and extra-embryonic vasculature. Angiogenic assays performed in adult mice revealed that mutant mice display a comparable angiogenic and vascular remodeling response to control mice. In Sm22-Cre; Smad5(fl/-) mice, Smad5 is also deleted in cardiomyocytes. Echocardiographic analysis on those 9-month-old female mice demonstrated larger left ventricle internal diameters and decreased fractional shortening compared with control littermates without signs of cardiac hypertrophy. The decreased cardiac contractility was associated with a decreased performance in a treadmill experiment. In isolated cardiomyocytes, fractional shortening was significantly reduced compared with control cells. These data demonstrate that restricted deletion of Smad5 in the blood vessel wall results in viable mice. However, loss of Smad5 in cardiomyocytes leads to a mild heart defect.
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Affiliation(s)
- Lieve Umans
- Department for Molecular and Developmental Genetics, VIB, Leuven, Belgium
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Smiseth OA, Steg PG, Sipido K, Battler A. News from the European Society of Cardiology Congress in Vienna, August 30 to September 3, 2003. J Am Coll Cardiol 2004; 43:691-7. [PMID: 14975484 DOI: 10.1016/j.jacc.2003.11.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2003] [Accepted: 11/25/2003] [Indexed: 11/18/2022]
Affiliation(s)
- Otto A Smiseth
- Department of Cardiology, Rikshospitalet University Hospital, Oslo, Norway
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Vangheluwe P, Louch WE, Ver Heyen M, Sipido K, Raeymaekers L, Wuytack F. Ca2+ transport ATPase isoforms SERCA2a and SERCA2b are targeted to the same sites in the murine heart. Cell Calcium 2003; 34:457-64. [PMID: 14572804 DOI: 10.1016/s0143-4160(03)00126-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Adult SERCA2(b/b) mice expressing the non-muscle Ca2+ transport ATPase isoform SERCA2b in the heart instead of the normally predominant sarcomeric SERCA2a isoform, develop mild concentric ventricular hypertrophy with impaired cardiac contractility and relaxation [Circ. Res. 89 (2001) 838]. Results from a separate study on transgenic mice overexpressing SERCA2b in the normal SERCA2a context were interpreted to show that SERCA2b and SERCA2a are differentially targeted within the cardiac sarcoplasmic reticulum (SR) [J. Biol. Chem. 275 (2000) 24722]. Since a different subcellular distribution of SERCA2b could underlie alterations in Ca2+ handling observed in SERCA2(b/b), we wanted to compare SERCA2b distribution in SERCA2(b/b) with that of SERCA2a in wild-type (WT). Using confocal microscopy on immunostained fixed myocytes and BODIPY-thapsigargin-stained living cells, we found that in SERCA2(b/b) mice SERCA2b is correctly targeted to cardiac SR and is present in the same SR regions as SERCA2a and SERCA2b in WT. We conclude that there is no differential targeting of SERCA2a and SERCA2b since both are found in the longitudinal SR and in the SR proximal to the Z-bands. Therefore, alterations in Ca2+ handling and the development of hypertrophy in adult SERCA2(b/b) mice do not result from different SERCA2b targeting.
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Affiliation(s)
- Peter Vangheluwe
- Department of Physiology, Katholieke Universiteit Leuven, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium.
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Claus P, Bijnens B, Weidemann F, Dommke C, Bito V, Heinzel F, Sipido K, De Scheerder I, Rademakers FE, Sutherland GR. Post-Systolic Thickening in Ischaemic Myocardium: A Simple Mathematical Model for Simulating Regional Deformation. ACTA ACUST UNITED AC 2001. [DOI: 10.1007/3-540-45572-8_19] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Ver Heyen M, Heymans S, Antoons G, Reed T, Periasamy M, Awede B, Lebacq J, Vangheluwe P, Dewerchin M, Collen D, Sipido K, Carmeliet P, Wuytack F. Replacement of the muscle-specific sarcoplasmic reticulum Ca(2+)-ATPase isoform SERCA2a by the nonmuscle SERCA2b homologue causes mild concentric hypertrophy and impairs contraction-relaxation of the heart. Circ Res 2001; 89:838-46. [PMID: 11679415 DOI: 10.1161/hh2101.098466] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The cardiac sarco(endo)plasmic reticulum Ca(2+)-ATPase gene (ATP2A2) encodes the following two different protein isoforms: SERCA2a (muscle-specific) and SERCA2b (ubiquitous). We have investigated whether this isoform specificity is required for normal cardiac function. Gene targeting in mice successfully disrupted the splicing mechanism responsible for generating the SERCA2a isoform. Homozygous SERCA2a(-/-) mice displayed a complete loss of SERCA2a mRNA and protein resulting in a switch to the SERCA2b isoform. The expression of SERCA2b mRNA and protein in hearts of SERCA2a(-/-) mice corresponded to only 50% of wild-type SERCA2 levels. Cardiac phospholamban mRNA levels were unaltered in SERCA2a(-/-) mice, but total phospholamban protein levels increased 2-fold. The transgenic phenotype was characterized by a approximately 20% increase in embryonic and neonatal mortality (early phenotype), with histopathologic evidence of major cardiac malformations. Adult SERCA2a(-/-) animals (adult phenotype) showed a reduced spontaneous nocturnal activity and developed a mild compensatory concentric cardiac hypertrophy with impaired cardiac contractility and relaxation, but preserved beta-adrenergic response. Ca(2+) uptake levels in SERCA2a(-/-) cardiac homogenates were reduced by approximately 50%. In isolated cells, relaxation and Ca(2+) removal by the SR were significantly reduced. Comparison of our data with those obtained in mice expressing similar cardiac levels of SERCA2a instead of SERCA2b indicate the importance of the muscle-specific SERCA2a isoform for normal cardiac development and for the cardiac contraction-relaxation cycle.
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Affiliation(s)
- M Ver Heyen
- Laboratories of Physiology, Flanders Interuniversity Institute for Biotechnology, Katholieke Universiteit Leuven, Belgium
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Macianskiene R, Matejovic P, Sipido K, Flameng W, Mubagwa K. Modulation of the extracellular divalent cation-inhibited non-selective conductance in cardiac cells by metabolic inhibition and by oxidants. J Mol Cell Cardiol 2001; 33:1371-85. [PMID: 11437543 DOI: 10.1006/jmcc.2001.1401] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effect of metabolic inhibition and oxidative stress on the monovalent cation-permeable, extracellular divalent cation-inhibited non-selective conductance was investigated in ventricular myocytes at 22 degrees C. Under whole-cell voltage-clamp, with L-type Ca2+ channels blocked by nifedipine, and K+ currents blocked by Cs+ substitution for K+, removal of Ca2+(o)and Mg2+(o) induced a non-selective current (I(NS-(Ca)o)) in mouse, rabbit and rat cells. Removal of glucose increased I(NS-(Ca)o)in the absence of Ca2+(o) and Mg2+(o), but failed to induce this current in the presence of the divalent cations. Further inhibition of glycolysis by 2-deoxyglucose (DOG; 10 mM, in zero glucose) or of mitochondrial function by rotenone (10 microM) or NaCN (5 mM) also failed to induce I(NS-(Ca)o)in the presence of Ca2+(o) and Mg2+(o). Even when given together, DOG and rotenone did not induce I(NS-(Ca)o) in the presence of divalent cations. Preactivated I(NS-(Ca)o) was increased by the oxidants thimerosal (50 microM), diamide (500 microM) and pCMPS (50 microM). However, none of these drugs nor NEM (1 mM) did elicit I(NS-(Ca)o)in the presence of Ca2+(o) and Mg2+(o). Exposure of rat myocytes to Ag+ induced a current resembling I(NS-(Ca)o) (reversing at -5 mV; blocked by 100 microM Gd3+) even in the presence of divalent cations. The data indicate that metabolic inhibition only regulates activated I(NS-(Ca)o)but does not induce the opening of closed channels, and that small oxidants like Ag+ may induce I(NS-(Ca)o) activation by accessing at sites unavailable for larger molecules.
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Affiliation(s)
- R Macianskiene
- Laboratory of Cardiac Cellular Research, Centre for Experimental Surgery and Anaesthesiology, Katholieke Universiteit Leuven, Campus Gasthuisberg, Leuven, B-3000, Belgium
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Mubagwa K, Lin W, Sipido K, Bosteels S, Flameng W. Monensin-induced reversal of positive force-frequency relationship in cardiac muscle: role of intracellular sodium in rest-dependent potentiation of contraction. J Mol Cell Cardiol 1997; 29:977-89. [PMID: 9152859 DOI: 10.1006/jmcc.1996.0342] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We have investigated the role of a rest-dependent inotropic factor in determining species-related differences in cardiac force-frequency relationships (FFR). Isolated rat, rabbit or guinea-pig papillary muscles, as well as guinea-pig ventricular myocytes were superfused with 1.8 mM Ca2+ Tyrode. In rat muscles, isometric force amplitude decreased, while in rabbit or guinea-pig muscles force increased with frequency (0.02-1 Hz). Paired-pulse pacing potentiated contraction markedly at all frequencies in rabbit muscles, but not at low frequencies in rat muscles. We tested the hypothesis that high intracellular Na+ levels (Nai) are responsible for negative FFR. The ionophore monensin increased Nai, reversed the FFR of rabbit and guinea-pig muscles from positive to negative, by increasing force mostly at low frequencies, and decreased the paired-pulse potentiation of contraction at low frequencies. Monensin added during rest also reversed rest-induced decay. In isolated myocytes, monensin had qualitatively similar effects on cell shortening as well as on Cai transients. Monensin also decreased the action potential duration (APD) but did not change the pattern of its variation with frequency. Cells intracellularly dialyzed with 20 mM Na+ via a patch pipette also showed rest potentiation of the Cai transients, in contrast to cells dialyzed with 10 mM Na+, which showed rest decay of the transients. APD was also shorter in myocytes dialyzed with 20 mM Na+ than in those dialyzed with lower Na+. The results indicate that in the presence of high Nai, sarcoplasmic reticular Ca2+ load is increased during diastole, possibly via reverse-mode Na+/Ca2+ exchange, and therefore that Nai is an important factor determining the FFR. In addition, the data suggest that short APDs in preparations showing negative FFR may be partly a consequence of increased Nai.
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Affiliation(s)
- K Mubagwa
- Centre for Experimental Surgery and Anaesthesiology, Katholieke Universiteit Leuven, Belgium
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