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Krause J, Nickel A, Madsen A, Aitken-Buck HM, Stoter AMS, Schrapers J, Ojeda F, Geiger K, Kern M, Kohlhaas M, Bertero E, Hofmockel P, Hübner F, Assum I, Heinig M, Müller C, Hansen A, Krause T, Park DD, Just S, Aïssi D, Börnigen D, Lindner D, Friedrich N, Alhussini K, Bening C, Schnabel RB, Karakas M, Iacoviello L, Salomaa V, Linneberg A, Tunstall-Pedoe H, Kuulasmaa K, Kirchhof P, Blankenberg S, Christ T, Eschenhagen T, Lamberts RR, Maack C, Stenzig J, Zeller T. An arrhythmogenic metabolite in atrial fibrillation. J Transl Med 2023; 21:566. [PMID: 37620858 PMCID: PMC10464005 DOI: 10.1186/s12967-023-04420-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 08/07/2023] [Indexed: 08/26/2023] Open
Abstract
BACKGROUND Long-chain acyl-carnitines (ACs) are potential arrhythmogenic metabolites. Their role in atrial fibrillation (AF) remains incompletely understood. Using a systems medicine approach, we assessed the contribution of C18:1AC to AF by analysing its in vitro effects on cardiac electrophysiology and metabolism, and translated our findings into the human setting. METHODS AND RESULTS Human iPSC-derived engineered heart tissue was exposed to C18:1AC. A biphasic effect on contractile force was observed: short exposure enhanced contractile force, but elicited spontaneous contractions and impaired Ca2+ handling. Continuous exposure provoked an impairment of contractile force. In human atrial mitochondria from AF individuals, C18:1AC inhibited respiration. In a population-based cohort as well as a cohort of patients, high C18:1AC serum concentrations were associated with the incidence and prevalence of AF. CONCLUSION Our data provide evidence for an arrhythmogenic potential of the metabolite C18:1AC. The metabolite interferes with mitochondrial metabolism, thereby contributing to contractile dysfunction and shows predictive potential as novel circulating biomarker for risk of AF.
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Affiliation(s)
- Julia Krause
- University Center of Cardiovascular Science, Department of Cardiology, University Heart and Vascular Center Hamburg, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Alexander Nickel
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Alexandra Madsen
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hamish M Aitken-Buck
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - A M Stella Stoter
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jessica Schrapers
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Francisco Ojeda
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
| | - Kira Geiger
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Melanie Kern
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Michael Kohlhaas
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Edoardo Bertero
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Patrick Hofmockel
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Florian Hübner
- Institute of Food Chemistry, University of Münster, Münster, Germany
| | - Ines Assum
- Institute of Computational Biology, Helmholtz Zentrum München, Munich, Germany
- Department of Informatics, Technical University Munich, Munich, Germany
| | - Matthias Heinig
- Institute of Computational Biology, Helmholtz Zentrum München, Munich, Germany
- Department of Informatics, Technical University Munich, Munich, Germany
| | - Christian Müller
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
| | - Arne Hansen
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tobias Krause
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Deung-Dae Park
- Molecular Cardiology, Department of Internal Medicine II, University of Ulm, Ulm, Germany
| | - Steffen Just
- Molecular Cardiology, Department of Internal Medicine II, University of Ulm, Ulm, Germany
| | - Dylan Aïssi
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
| | - Daniela Börnigen
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
| | - Diana Lindner
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
- Department of Cardiology and Angiology, Faculty of Medicine, University Heart Center Freiburg-Bad Krozingen, Medical Center - University of Freiburg, University of Freiburg, 79106, Freiburg, Germany
| | - Nele Friedrich
- Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald, Greifswald, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Khaled Alhussini
- Department of Thoracic and Cardiovascular Surgery, University Clinic Würzburg, Würzburg, Germany
| | - Constanze Bening
- Department of Thoracic and Cardiovascular Surgery, University Clinic Würzburg, Würzburg, Germany
| | - Renate B Schnabel
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
| | - Mahir Karakas
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Licia Iacoviello
- Department of Epidemiology and Prevention, IRCCS Neuromed, Pozzilli, Italy
- Department of Medicine and Surgery, Research Center in Epidemiology and Preventive Medicine (EPIMED), University of Insubria, Varese, Italy
| | - Veikko Salomaa
- Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Allan Linneberg
- Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospital, Capital Region of Denmark, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Hugh Tunstall-Pedoe
- Cardiovascular Epidemiology Unit, Institute of Cardiovascular Research, University of Dundee, Dundee, UK
| | - Kari Kuulasmaa
- Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Paulus Kirchhof
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Stefan Blankenberg
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Department of Cardiology, University Heart and Vascular Center Hamburg, Hamburg, Germany
| | - Torsten Christ
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thomas Eschenhagen
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Regis R Lamberts
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Christoph Maack
- Comprehensive Heart Failure Center, University Clinic Würzburg, Würzburg, Germany
| | - Justus Stenzig
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tanja Zeller
- University Center of Cardiovascular Science, Department of Cardiology, University Heart and Vascular Center Hamburg, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany.
- DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany.
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Shen J, Zhu D, Chen L, Cang J, Zhao Z, Ji Y, Liu S, Miao H, Liu Y, Zhou Q, He Y, Cai J. Relationship between epicardial adipose tissue measured by computed tomography and premature ventricular complexes originating from different sites. Europace 2023; 25:euad102. [PMID: 37083023 PMCID: PMC10228628 DOI: 10.1093/europace/euad102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 03/27/2023] [Indexed: 04/22/2023] Open
Abstract
AIMS This study aims to explore the association between the features of epicardial adipose tissue (EAT) in different zones and premature ventricular complexes (PVCs) originating from different sites by computed tomography (CT). METHODS AND RESULTS A total of 136 patients who underwent radiofrequency ablation for PVCs were incorporated in this study. One hundred and thirty-six matched controls were included in this study using the case-control method (1:1 matching). PVCs were classified into four subgroups: (1) right ventricular outflow tract (RVOT-PVCs), (2) non-RVOT of the right ventricle (RV-PVCs), (3) left ventricular outflow tract (LVOT-PVCs), and (4) non-LVOT of the left ventricle (LV-PVCs). The volume and density of EAT were quantified by CT. Patients with PVCs had a significantly higher volume and lower density of EAT than the controls (P < 0.001). The LVOT-PVCs and LV-PVCs had a higher left ventricle periventricular EAT volume (LV-EATv) proportion (P < 0.05). The right ventricle periventricular EAT volume (RV-EATv) proportion was higher in ROVT-PVCs and LVOT-PVCs (P < 0.05). RVOT-PVC patients had a higher volume ratio and a smaller density differential (P < 0.05). Patients with LVOT-PVCs had a lower volume ratio and the LV-PVCs showed a greater density differential (P < 0.05). CONCLUSION Higher volume and lower density of EAT were significantly associated with frequent PVCs. The RVOT-PVC patients had a higher volume ratio and a smaller density differential. The LVOT-PVCs had a lower volume ratio and the LV-PVCs showed a greater density differential. These suggest a link between EAT structural properties and PVCs and a potential role for regional EAT in the development of PVCs.
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Affiliation(s)
- Junxian Shen
- Department of Cardiology, Zhongda Hospital of Southeast University, Southeast University,Nanjing, China
| | - Didi Zhu
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
| | - Long Chen
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
| | - Jiehui Cang
- Department of Cardiology, Zhongda Hospital of Southeast University, Southeast University,Nanjing, China
| | - Zhen Zhao
- Department of Radiology, Zhongda Hospital of Southeast University, Nanjing, China
| | - Yuqin Ji
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
| | - Shangshang Liu
- Department of Cardiology, Zhongda Hospital of Southeast University, Southeast University,Nanjing, China
| | - Hongyu Miao
- Department of Cardiology, Zhongda Hospital of Southeast University, Southeast University,Nanjing, China
| | - Yaowu Liu
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
| | - Qianxing Zhou
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
| | - Yanru He
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
| | - Junyan Cai
- Department of Cardiology, Zhongda Hospital of Southeast University, Central Gate Street, Gulou District, Nanjing City, Jiangsu Province 210009, China
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Moore M, Moharram M, Poon A, Tse R, Aitken-Buck HM, Lamberts RS, Coffey S. A simple and reproducible measure of adipose depots with non-contrast post-mortem computed tomography. IMAGING 2022. [DOI: 10.1556/1647.2022.00066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
AbstractBackground and aimObesity is associated with an increase in different adipose depots. The anatomic distribution of internal adipose confers different risks. Recently, significant interest has emerged in the expansion of epicardial adipose tissue (EAT) as a mediator of adverse cardiovascular events. Often, post-mortem examination remains the best method of investigating morphological changes in health and disease. This study aimed to develop a simple, reproducible, and non-invasive protocol for the measurement of internal adiposity using post-mortem computed tomography (PMCT).Patients and methods101 consecutive post-mortem subjects underwent non-contrast computed tomography scans. Measurements were performed using the open-source software 3D Slicer by a non-expert researcher. An expert radiologist and cardiologist verified the abdominal and cardiac sites of adiposity, respectively. We aimed to develop a protocol to measure total EAT, sub-depots of EAT, extra-pericardial adipose, visceral and subcutaneous adipose, and suprasternal adipose.ResultsWe found excellent reproducibility for our measures of total EAT, anterior right atrial EAT, extra-pericardial adipose, and visceral adipose tissue, with intraclass correlations between 0.82 and 0.99 for each measure. Due to a lack of suitable anatomical boundaries, other sub-depots of EAT, including in the interventricular groove, were not reproducible.ConclusionsQuantification of total EAT and anterior right atrial EAT are readily reproducible using 3D Slicer on post-mortem CT. They can be reliably measured by non-expert researchers with a small amount of training, and therefore be used to investigate morphological changes in adiposity in health and disease.
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Affiliation(s)
- Matthew Moore
- Department of Medicine, HeartOtago, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Mohammed Moharram
- Department of Medicine, HeartOtago, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Andre Poon
- Department of Radiology, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand
| | - Rexson Tse
- Department of Forensic Pathology, LabPLUS, Auckland City Hospital, Auckland, New Zealand
| | - Hamish M. Aitken-Buck
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Regis S. Lamberts
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Sean Coffey
- Department of Medicine, HeartOtago, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
- Department of Cardiology, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand
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Coffey S, Dixit P, Saw EL, Babakr AA, van Hout I, Galvin IF, Saxena P, Bunton RW, Davis PJ, Lamberts RR, Katare R, Williams MJA. Thiamine increases resident endoglin positive cardiac progenitor cells and atrial contractile force in humans: A randomised controlled trial. Int J Cardiol 2021; 341:70-73. [PMID: 34461161 DOI: 10.1016/j.ijcard.2021.08.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 08/13/2021] [Accepted: 08/24/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND The heart has an intrinsic ability to regenerate, orchestrated by progenitor or stem cells. However, the relative complexity of non-resident cardiac progenitor cell (CPC) therapy makes modulation of resident CPCs a more attractive treatment target. Thiamine analogues improve resident CPC function in pre-clinical models. In this double blinded randomised controlled trial (identifier: ACTRN12614000755639), we examined whether thiamine would improve CPC function in humans. METHODS AND RESULTS High dose oral thiamine (one gram twice daily) or matching placebo was administered 3-5 days prior to coronary artery bypass surgery (CABG). Right atrial appendages were collected at the time of CABG, and CPCs isolated. There was no difference in the primary outcome (proliferation ability of CPCs) between treatment groups. Older age was not associated with decreased proliferation ability. In exploratory analyses, isolated CPCs in the thiamine group showed an increase in the proportion of CD34-/CD105+ (endoglin) cells, but no difference in CD34-/CD90+ or CD34+ cells. Thiamine increased maximum force developed by isolated trabeculae, with no difference in relaxation time or beta-adrenergic responsiveness. CONCLUSION Thiamine does not improve proliferation ability of CPC in patients undergoing CABG, but increases the proportion of CD34-/CD105+ cells. Having not met its primary endpoint, this study provides the impetus to re-examine CPC biology prior to any clinical outcome-based trial examining potential beneficial cardiovascular effects of thiamine.
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Affiliation(s)
- Sean Coffey
- Department of Medicine - HeartOtago, Dunedin School of Medicine, University of Otago, New Zealand; Department of Cardiology, Southern District Health Board, New Zealand.
| | - Parul Dixit
- Department of Physiology - HeartOtago, School of Biomedical Sciences, University of Otago, New Zealand
| | - Eng Leng Saw
- Department of Physiology - HeartOtago, School of Biomedical Sciences, University of Otago, New Zealand
| | - Aram A Babakr
- Department of Physiology - HeartOtago, School of Biomedical Sciences, University of Otago, New Zealand
| | - Isabelle van Hout
- Department of Physiology - HeartOtago, School of Biomedical Sciences, University of Otago, New Zealand
| | - Ivor F Galvin
- Department of Cardiothoracic Surgery, Southern District Health Board, New Zealand
| | - Pankaj Saxena
- Department of Cardiothoracic Surgery, Southern District Health Board, New Zealand
| | - Richard W Bunton
- Department of Cardiothoracic Surgery, Southern District Health Board, New Zealand
| | - Philip J Davis
- Department of Cardiothoracic Surgery, Southern District Health Board, New Zealand
| | - Regis R Lamberts
- Department of Physiology - HeartOtago, School of Biomedical Sciences, University of Otago, New Zealand
| | - Rajesh Katare
- Department of Physiology - HeartOtago, School of Biomedical Sciences, University of Otago, New Zealand
| | - Michael J A Williams
- Department of Medicine - HeartOtago, Dunedin School of Medicine, University of Otago, New Zealand; Department of Cardiology, Southern District Health Board, New Zealand
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Left Ventricular Summit-Concept, Anatomical Structure and Clinical Significance. Diagnostics (Basel) 2021; 11:diagnostics11081423. [PMID: 34441357 PMCID: PMC8393416 DOI: 10.3390/diagnostics11081423] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/02/2021] [Accepted: 08/04/2021] [Indexed: 01/18/2023] Open
Abstract
The left ventricular summit (LVS) is a triangular area located at the most superior portion of the left epicardial ventricular region, surrounded by the two branches of the left coronary artery: the left anterior interventricular artery and the left circumflex artery. The triangle is bounded by the apex, septal and mitral margins and base. This review aims to provide a systematic and comprehensive anatomical description and proper terminology in the LVS region that may facilitate exchanging information among anatomists and electrophysiologists, increasing knowledge of this cardiac region. We postulate that the most dominant septal perforator (not the first septal perforator) should characterize the LVS definition. Abundant epicardial adipose tissue overlying the LVS myocardium may affect arrhythmogenic processes and electrophysiological procedures within the LVS region. The LVS is divided into two clinically significant regions: accessible and inaccessible areas. Rich arterial and venous coronary vasculature and a relatively dense network of cardiac autonomic nerve fibers are present within the LVS boundaries. Although the approach to the LVS may be challenging, it can be executed indirectly using the surrounding structures. Delivery of the proper radiofrequency energy to the arrhythmia source, avoiding coronary artery damage at the same time, may be a challenge. Therefore, coronary angiography or cardiac computed tomography imaging is strongly recommended before any procedure within the LVS region. Further research on LVS morphology and physiology should increase the safety and effectiveness of invasive electrophysiological procedures performed within this region of the human heart.
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Aitken-Buck HM, Krause J, van Hout I, Davis PJ, Bunton RW, Parry DJ, Williams MJA, Coffey S, Zeller T, Jones PP, Lamberts RR. Long-chain acylcarnitine 18:1 acutely increases human atrial myocardial contractility and arrhythmia susceptibility. Am J Physiol Heart Circ Physiol 2021; 321:H162-H174. [PMID: 34085842 DOI: 10.1152/ajpheart.00184.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Long-chain acylcarnitines (LCACs) are known to directly alter cardiac contractility and electrophysiology. However, the acute effect of LCACs on human cardiac function is unknown. We aimed to determine the effect of LCAC 18:1, which has been associated with cardiovascular disease, on the contractility and arrhythmia susceptibility of human atrial myocardium. Additionally, we aimed to assess how LCAC 18:1 alters Ca2+ influx and spontaneous Ca2+ release in vitro. Human right atrial trabeculae (n = 32) stimulated at 1 Hz were treated with LCAC 18:1 at a range of concentrations (1-25 µM) for a 45-min period. Exposure to the LCAC induced a dose-dependent positive inotropic effect on myocardial contractility (maximal 1.5-fold increase vs. control). At the 25 µM dose (n = 8), this was paralleled by an enhanced propensity for spontaneous contractions (50% increase). Furthermore, all LCAC 18:1 effects on myocardial function were reversed following LCAC 18:1 washout. In fluo-4-AM-loaded HEK293 cells, LCAC 18:1 dose dependently increased cytosolic Ca2+ influx relative to vehicle controls and the short-chain acylcarnitine C3. In HEK293 cells expressing ryanodine receptor (RyR2), this increased Ca2+ influx was linked to an increased propensity for RyR2-mediated spontaneous Ca2+ release events. Our study is the first to show that LCAC 18:1 directly and acutely alters human myocardial function and in vitro Ca2+ handling. The metabolite promotes proarrhythmic muscle contractions and increases contractility. The exploratory findings in vitro suggest that LCAC 18:1 increases proarrhythmic RyR2-mediated spontaneous Ca2+ release propensity. The direct effects of metabolites on human myocardial function are essential to understand cardiometabolic dysfunction.NEW & NOTEWORTHY For the first time, the fatty acid metabolite, long-chain acylcarnitine 18:1, is shown to acutely increase the arrhythmia susceptibility and contractility of human atrial myocardium. In vitro, this was linked to an influx of Ca2+ and an enhanced propensity for spontaneous RyR2-mediated Ca2+ release.
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Affiliation(s)
- Hamish M Aitken-Buck
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Julia Krause
- University Heart and Vascular Centre, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Isabelle van Hout
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Philip J Davis
- Department of Cardiothoracic Surgery, Otago Medical School-Dunedin Campus, Dunedin Hospital, Dunedin, New Zealand
| | - Richard W Bunton
- Department of Cardiothoracic Surgery, Otago Medical School-Dunedin Campus, Dunedin Hospital, Dunedin, New Zealand
| | - Dominic J Parry
- Department of Cardiothoracic Surgery, Otago Medical School-Dunedin Campus, Dunedin Hospital, Dunedin, New Zealand
| | - Michael J A Williams
- Department of Medicine, Heart Otago, Otago Medical School-Dunedin Campus, University of Otago, Dunedin, New Zealand
| | - Sean Coffey
- Department of Medicine, Heart Otago, Otago Medical School-Dunedin Campus, University of Otago, Dunedin, New Zealand
| | - Tanja Zeller
- University Heart and Vascular Centre, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Peter P Jones
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Regis R Lamberts
- Department of Physiology, HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
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Michel LYM, Farah C, Balligand JL. The Beta3 Adrenergic Receptor in Healthy and Pathological Cardiovascular Tissues. Cells 2020; 9:cells9122584. [PMID: 33276630 PMCID: PMC7761574 DOI: 10.3390/cells9122584] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 11/27/2020] [Accepted: 11/30/2020] [Indexed: 12/15/2022] Open
Abstract
The third isotype of beta-adrenoreceptors (β3-AR) has recently come (back) into focus after the observation of its expression in white and beige human adipocytes and its implication in metabolic regulation. This coincides with the recent development and marketing of agonists at the human receptor with superior specificity. Twenty years ago, however, we and others described the expression of β3-AR in human myocardium and its regulation of contractility and cardiac remodeling. Subsequent work from many laboratories has since expanded the characterization of β3-AR involvement in many aspects of cardiovascular physio(patho)logy, justifying the present effort to update current paradigms under the light of the most recent evidence.
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Affiliation(s)
- Lauriane Y. M. Michel
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Experimentale et Clinique (IREC), Université Catholique de Louvain, B1.57.04, 57 Avenue Hippocrate, 1200 Brussels, Belgium; (L.Y.M.M.); (C.F.)
| | - Charlotte Farah
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Experimentale et Clinique (IREC), Université Catholique de Louvain, B1.57.04, 57 Avenue Hippocrate, 1200 Brussels, Belgium; (L.Y.M.M.); (C.F.)
| | - Jean-Luc Balligand
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Experimentale et Clinique (IREC), Université Catholique de Louvain, B1.57.04, 57 Avenue Hippocrate, 1200 Brussels, Belgium; (L.Y.M.M.); (C.F.)
- Department of Medicine, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, 10 Avenue Hippocrate, 1200 Brussels, Belgium
- Correspondence: ; Tel.: +32-27645262
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8
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Aitken-Buck HM, Babakr AA, Fomison-Nurse IC, van Hout I, Davis PJ, Bunton RW, Williams MJA, Coffey S, Jones PP, Lamberts RR. Inotropic and lusitropic, but not arrhythmogenic, effects of adipocytokine resistin on human atrial myocardium. Am J Physiol Endocrinol Metab 2020; 319:E540-E547. [PMID: 32715745 DOI: 10.1152/ajpendo.00202.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The adipocytokine resistin is released from epicardial adipose tissue (EAT). Plasma resistin and EAT deposition are independently associated with atrial fibrillation. The EAT secretome enhances arrhythmia susceptibility and inotropy of human myocardium. Therefore, we aimed to determine the effect of resistin on the function of human myocardium and how resistin contributes to the proarrhythmic effect of EAT. EAT biopsies were obtained from 25 cardiac surgery patients. Resistin levels were measured by ELISA in 24-h EAT culture media (n = 8). The secretome resistin concentrations increased over the culture period to a maximal level of 5.9 ± 1.2 ng/mL. Coculture with β-adrenergic agonists isoproterenol (n = 4) and BRL37344 (n = 13) had no effect on EAT resistin release. Addition of resistin (7, 12, 20 ng/mL) did not significantly increase the spontaneous contraction propensity of human atrial trabeculae (n = 10) when given alone or in combination with isoproterenol. Resistin dose-dependently increased trabecula-developed force (maximal 2.9-fold increase, P < 0.0001), as well as the maximal rates of contraction (2.6-fold increase, P = 0.002) and relaxation (1.8-fold increase, P = 0.007). Additionally, the postrest potentiation capacity of human trabeculae was reduced at all resistin doses, suggesting that the inotropic effect induced by resistin might be due to altered sarcoplasmic reticulum Ca2+ handling. EAT resistin release is not modulated by common arrhythmia triggers. Furthermore, exogenous resistin does not promote arrhythmic behavior in human atrial trabeculae. Resistin does, however, induce an acute dose-dependent positive inotropic and lusitropic effect.
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Affiliation(s)
- Hamish M Aitken-Buck
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Aram A Babakr
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Ingrid C Fomison-Nurse
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Isabelle van Hout
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Philip J Davis
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Richard W Bunton
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Michael J A Williams
- Department of Medicine and HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Sean Coffey
- Department of Medicine and HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Peter P Jones
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Regis R Lamberts
- Department of Physiology and HeartOtago, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
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