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Abulfadl YS, El Ela YA, Al Khaiyat AM, Elkhodary KI, Badran M. Cyclophosphamide enfeebles myocardial isometric contraction force via RIP1/RIP3/MLKL/TRPM7-mediated necroptosis. Biomed Pharmacother 2023; 163:114819. [PMID: 37146416 DOI: 10.1016/j.biopha.2023.114819] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/23/2023] [Accepted: 04/30/2023] [Indexed: 05/07/2023] Open
Abstract
This study explores the negative impact of cyclophosphamide (CP) on cardiac contractility by specifically examining its effect on the active and passive tension of the cardiac muscle in-vitro and revealing the mechanism through which CP induces myocardial insult in-vivo. In young male Sprague-Dawley rats, cardiac toxicity was induced by a single intraperitoneal injection of CP (150 mg/kg body weight). Axial heart tissue slices were electrically stimulated, and the total isometric contraction force was measured at varying pretension levels. Blood and tissue biochemical assays, and histological/ immuno-histological assessments were conducted to evaluate the underlying molecular mechanisms. Statistical analysis shows that there is a significant difference between the drugged and the control groups in terms of the active tension values. Moreover, the pre-tension stress significantly affects both the active and passive tension values. CP altered heart, body, and heart-to-body weight, desolated cardiac muscle architecture, surged cardiac enzymes (CK-MB, LDH, and cTn l), augmented myocardial oxidative stressors (MDA), and weakened myocardial antioxidant status (SOD and GSH). Mechanistically, cyclophosphamide prompted the necroptotic trajectory evidenced by the activation of RIPK1, RIPK3, MLKL and TRPM7, the inhibition of caspase 8 and BCL2 and the upregulation of the protein/mRNA expression of TNF-α and TNFR1. This study identifies necroptosis as a key factor in cyclophosphamide-evoked myocardial contractility impairment, highlighting its potential as a target for alleviating antitumor-related myocardial damage. This innovative approach to investigating the underlying mechanisms of CP-induced cardiac toxicity offers valuable insights into the potential of developing new therapies to mitigate cyclophosphamide's negative impact.
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Affiliation(s)
- Yasmin S Abulfadl
- Department of Pharmacology, Toxicology, and Biochemistry, Faculty of Pharmacy, Future University in Egypt, New Cairo 11835, Egypt
| | - Yousef Abo El Ela
- Department of Mechanical Engineering, School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt
| | - Abdallah M Al Khaiyat
- Department of Mechanical Engineering, School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt
| | - Khalil I Elkhodary
- Department of Mechanical Engineering, School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt
| | - Mohamed Badran
- Department of Mechanical Engineering, School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt.
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2
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Maselli D, Matos RS, Johnson RD, Martella D, Caprettini V, Chiappini C, Camelliti P, Campagnolo P. Porcine Organotypic Epicardial Slice Protocol: A Tool for the Study of Epicardium in Cardiovascular Research. Front Cardiovasc Med 2022; 9:920013. [PMID: 35924218 PMCID: PMC9339655 DOI: 10.3389/fcvm.2022.920013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 05/30/2022] [Indexed: 11/13/2022] Open
Abstract
The epicardium has recently gained interest in the cardiovascular field due to its capacity to support heart regeneration after ischemic injury. Models to study the epicardium of large animals in vitro are limited and mainly based on epicardial cell isolation/differentiation from stem cells, followed by 2D cells culture. In this method paper, we describe the procedure to obtain and culture 3D organotypic heart slices presenting an intact epicardium, as a novel model to study the epicardial physiology and activation. Epicardial slices are obtained from porcine hearts using a high-precision vibratome and retain a healthy epicardial layer embedded in its native extracellular environment and connected with other cardiac cells (cardiomyocytes, fibroblasts, vascular cells etc.). Epicardial slices can be cultured for 72 h, providing an ideal model for studying the epicardium physiology or perform pharmacological interventions/gene therapy approaches. We also report on methods to assesses the viability and composition of the epicardial slices, and evaluate their architecture in 3D through tissue decoloration. Finally, we present a potential application for a nanomaterial-based gene transfer method for tracking of epicardial cells within the slice. Crucially, given the similarity in morphology and physiology of porcine heart with its human counterpart, our system provides a platform for translational research while providing a clinically relevant and ethical alternative to the use of small animals in this type of research.
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Affiliation(s)
- Davide Maselli
- Cardiovascular Section, Department of Biochemical Sciences, University of Surrey, Guildford, United Kingdom
| | - Rolando S. Matos
- Cardiovascular Section, Department of Biochemical Sciences, University of Surrey, Guildford, United Kingdom
| | - Robert D. Johnson
- Cardiovascular Section, Department of Biochemical Sciences, University of Surrey, Guildford, United Kingdom
| | - Davide Martella
- London Centre for Nanotechnology, King's College London, London, United Kingdom
- Centre for Craniofacial and Regenerative Biology, King's College London, London, United Kingdom
| | - Valeria Caprettini
- London Centre for Nanotechnology, King's College London, London, United Kingdom
- Centre for Craniofacial and Regenerative Biology, King's College London, London, United Kingdom
| | - Ciro Chiappini
- London Centre for Nanotechnology, King's College London, London, United Kingdom
- Centre for Craniofacial and Regenerative Biology, King's College London, London, United Kingdom
| | - Patrizia Camelliti
- Cardiovascular Section, Department of Biochemical Sciences, University of Surrey, Guildford, United Kingdom
| | - Paola Campagnolo
- Cardiovascular Section, Department of Biochemical Sciences, University of Surrey, Guildford, United Kingdom
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3
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Fusco-Allison G, Li DK, Hunter B, Jackson D, Bannon PG, Lal S, O'Sullivan JF. Optimizing the discovery and assessment of therapeutic targets in heart failure with preserved ejection fraction. ESC Heart Fail 2021; 8:3643-3655. [PMID: 34342166 PMCID: PMC8497375 DOI: 10.1002/ehf2.13504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 06/02/2021] [Accepted: 06/21/2021] [Indexed: 01/09/2023] Open
Abstract
There is an urgent need for models that faithfully replicate heart failure with preserved ejection fraction (HFpEF), now recognized as the most common form of heart failure in the world. In vitro approaches have several shortcomings, most notably the immature nature of stem cell‐derived human cardiomyocytes [induced pluripotent stem cells (iPSC)] and the relatively short lifespan of primary cardiomyocytes. Three‐dimensional ‘organoids’ incorporating mature iPSCs with other cell types such as endothelial cells and fibroblasts are a significant advance, but lack the complexity of true myocardium. Animal models can replicate many features of human HFpEF, and rodent models are the most common, and recent attempts to incorporate haemodynamic, metabolic, and ageing contributions are encouraging. Differences relating to species, physiology, heart rate, and heart size are major limitations for rodent models. Porcine models mitigate many of these shortcomings and approximate human physiology more closely, but cost and time considerations limit their potential for widespread use. Ex vivo analysis of failing hearts from animal models offer intriguing possibilities regarding cardiac substrate utilisation, but are ultimately subject to the same constrains as the animal models from which the hearts are obtained. Ex vivo approaches using human myocardial biopsies can uncover new insights into pathobiology leveraging myocardial energetics, substrate turnover, molecular changes, and systolic/diastolic function. In collaboration with a skilled cardiothoracic surgeon, left ventricular endomyocardial biopsies can be obtained at the time of valvular surgery in HFpEF patients. Critically, these tissues maintain their disease phenotype, preserving inter‐relationship of myocardial cells and extracellular matrix. This review highlights a novel approach, where ultra‐thin myocardial tissue slices from human HFpEF hearts can be used to assess changes in myocardial structure and function. We discuss current approaches to modelling HFpEF, describe in detail the novel tissue slice model, expand on exciting opportunities this model provides, and outline ways to improve this model further.
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Affiliation(s)
- Gabrielle Fusco-Allison
- Precision Cardiovascular Laboratory, The University of Sydney, Sydney, New South Wales, Australia.,Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,Heart Research Institute, Newtown, Sydney, New South Wales, Australia.,Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Desmond K Li
- Precision Cardiovascular Laboratory, The University of Sydney, Sydney, New South Wales, Australia.,Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,Heart Research Institute, Newtown, Sydney, New South Wales, Australia.,Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Benjamin Hunter
- Precision Cardiovascular Laboratory, The University of Sydney, Sydney, New South Wales, Australia.,Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia.,Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Dan Jackson
- Precision Cardiovascular Laboratory, The University of Sydney, Sydney, New South Wales, Australia.,Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia.,Discipline of Surgery, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Paul G Bannon
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,Discipline of Surgery, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Sean Lal
- Precision Cardiovascular Laboratory, The University of Sydney, Sydney, New South Wales, Australia.,Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia.,Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia.,Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - John F O'Sullivan
- Precision Cardiovascular Laboratory, The University of Sydney, Sydney, New South Wales, Australia.,Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia.,Heart Research Institute, Newtown, Sydney, New South Wales, Australia.,Central Clinical School, Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia.,Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia.,Faculty of Medicine, TU Dresden, Dresden, Germany
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4
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Peinkofer G, Maass M, Pfannkuche K, Sachinidis A, Baldus S, Hescheler J, Saric T, Halbach M. Persistence of intramyocardially transplanted murine induced pluripotent stem cell-derived cardiomyocytes from different developmental stages. Stem Cell Res Ther 2021; 12:46. [PMID: 33419458 PMCID: PMC7792075 DOI: 10.1186/s13287-020-02089-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 12/09/2020] [Indexed: 01/16/2023] Open
Abstract
Background Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CM) are regarded as promising cell type for cardiac cell replacement therapy, but it is not known whether the developmental stage influences their persistence and functional integration in the host tissue, which are crucial for a long-term therapeutic benefit. To investigate this, we first tested the cell adhesion capability of murine iPSC-CM in vitro at three different time points during the differentiation process and then examined cell persistence and quality of electrical integration in the infarcted myocardium in vivo. Methods To test cell adhesion capabilities in vitro, iPSC-CM were seeded on fibronectin-coated cell culture dishes and decellularized ventricular extracellular matrix (ECM) scaffolds. After fixed periods of time, stably attached cells were quantified. For in vivo experiments, murine iPSC-CM expressing enhanced green fluorescent protein was injected into infarcted hearts of adult mice. After 6–7 days, viable ventricular tissue slices were prepared to enable action potential (AP) recordings in transplanted iPSC-CM and surrounding host cardiomyocytes. Afterwards, slices were lysed, and genomic DNA was prepared, which was then used for quantitative real-time PCR to evaluate grafted iPSC-CM count. Results The in vitro results indicated differences in cell adhesion capabilities between day 14, day 16, and day 18 iPSC-CM with day 14 iPSC-CM showing the largest number of attached cells on ECM scaffolds. After intramyocardial injection, day 14 iPSC-CM showed a significant higher cell count compared to day 16 iPSC-CM. AP measurements revealed no significant difference in the quality of electrical integration and only minor differences in AP properties between d14 and d16 iPSC-CM. Conclusion The results of the present study demonstrate that the developmental stage at the time of transplantation is crucial for the persistence of transplanted iPSC-CM. iPSC-CM at day 14 of differentiation showed the highest persistence after transplantation in vivo, which may be explained by a higher capability to adhere to the extracellular matrix. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-020-02089-5.
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Affiliation(s)
- Gabriel Peinkofer
- Department of Internal Medicine III, University Hospital of Cologne, Cologne, Germany. .,Center for Physiology and Pathophysiology, Institute of Neurophysiology, Medical Faculty, University of Cologne, Robert-Koch Str. 37, Cologne, 50931, Germany. .,Marga-and-Walter-Boll Laboratory for Cardiac Tissue Engineering, University of Cologne, Cologne, Germany.
| | - Martina Maass
- Department of Internal Medicine III, University Hospital of Cologne, Cologne, Germany.,Department of Ophthalmology and Ocular GvHD Competence Center (P.S.), Medical Faculty, University of Cologne, Cologne, Germany
| | - Kurt Pfannkuche
- Center for Physiology and Pathophysiology, Institute of Neurophysiology, Medical Faculty, University of Cologne, Robert-Koch Str. 37, Cologne, 50931, Germany.,Marga-and-Walter-Boll Laboratory for Cardiac Tissue Engineering, University of Cologne, Cologne, Germany.,Department of Pediatric Cardiology, University Hospital of Cologne, Cologne, Germany.,Center for Molecular Medicine, University of Cologne, Cologne, Germany
| | - Agapios Sachinidis
- Center for Physiology and Pathophysiology, Institute of Neurophysiology, Medical Faculty, University of Cologne, Robert-Koch Str. 37, Cologne, 50931, Germany.,Center for Molecular Medicine, University of Cologne, Cologne, Germany
| | - Stephan Baldus
- Department of Internal Medicine III, University Hospital of Cologne, Cologne, Germany
| | - Jürgen Hescheler
- Center for Physiology and Pathophysiology, Institute of Neurophysiology, Medical Faculty, University of Cologne, Robert-Koch Str. 37, Cologne, 50931, Germany
| | - Tomo Saric
- Center for Physiology and Pathophysiology, Institute of Neurophysiology, Medical Faculty, University of Cologne, Robert-Koch Str. 37, Cologne, 50931, Germany
| | - Marcel Halbach
- Department of Internal Medicine III, University Hospital of Cologne, Cologne, Germany
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5
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Mahutga RR, Schoephoerster CT, Barocas VH. The Ring-Pull Assay for Mechanical Properties of Fibrous Soft Tissues - An Analysis of the Uniaxial Approximation and a Correction for Nonlinear Thick-Walled Tissues. EXPERIMENTAL MECHANICS 2021; 61:53-66. [PMID: 33583946 PMCID: PMC7880234 DOI: 10.1007/s11340-020-00623-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 06/15/2020] [Indexed: 05/05/2023]
Abstract
BACKGROUND The ring-pull test, where a ring of tissue is hooked via two pins and stretched, is a popular biomechanical test, especially for small arteries. Although convenient and reliable, the ring test produces inhomogeneous strain, making determination of material parameters non-trivial. OBJECTIVE To determine correction factors between ring-pull-estimated and true tissue properties. METHODS A finite-element model of ring pulling was constructed for a sample with nonlinear, anisotropic mechanical behavior typical of arteries. The pin force and sample cross-section were used to compute an apparent modulus at small and large strain, which were compared to the specified properties. The resulting corrections were validated with experiments on porcine and ovine arteries. The correction was further applied to experiments on mouse aortic rings to determine material and failure properties. RESULTS Calculating strain based on centerline stretch rather than inner-wall or outer-wall stretch afforded better estimation of tissue properties. Additional correction factors were developed based on ring wall thickness H, centerline ring radius R c , and pin radius a. The corrected estimates for tissue properties were in good agreement with uniaxial stretch experiments. CONCLUSIONS The computed corrections improved estimation of tissue material properties for both the small-strain (toe) modulus and the large-strain (lockout) modulus. When measuring tensile strength, one should minimize H/a to ensure that peak stress occurs at the sample midplane rather than near the pin. In this scenario, tensile strength can be estimated accurately by using inner-wall stretch at the midplane and the corrected properties.
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Affiliation(s)
- R. R. Mahutga
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
| | - C. T. Schoephoerster
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
| | - V. H. Barocas
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA
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6
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Different Responses to Drug Safety Screening Targets between Human Neonatal and Infantile Heart Tissue and Cardiac Bodies Derived from Human-Induced Pluripotent Stem Cells. Stem Cells Int 2019; 2019:6096294. [PMID: 30956672 PMCID: PMC6431377 DOI: 10.1155/2019/6096294] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 12/03/2018] [Indexed: 02/03/2023] Open
Abstract
Aims Induced pluripotent stem cell-derived cardiomyocytes (iPS-CMs) have become a promising tool in cardiovascular safety pharmacology. Immaturity of iPS-CMs remains an ongoing concern. We compared electrophysiological and contractile features of cardiac bodies (hiPS-CBs) derived from human-induced pluripotent stem cells and human neonatal and infantile myocardial slices relevant for drug screening. Methods and Results Myocardial tissue slices were prepared from biopsies obtained from patients undergoing surgery for hypoplastic left heart syndrome (HLHS) and tetralogy of Fallot (TOF). Electrophysiological features and response to Ik,r blockade as well as contractile properties were investigated using microelectrodes and isometric force measurements and were compared to hiPS-CBs. Both native myocardial tissue slices as well as hiPS-CBs showed action potential prolongation after Ik,r blockade, but early afterdepolarisations could be observed in native myocardial tissue slices only. The force-frequency relationship (FFR) varied at lower frequencies and was negative throughout at higher frequencies in hiPS-CBs. In contrast, native myocardial tissue slices exhibited positive, negative, and biphasic FFRs. In contrast to native myocardial tissue slices, hiPS-CBs failed to show an inotropic response to ß-adrenergic stimulation. Although all groups showed ß-adrenergic induced positive lusitropy, the effect was more pronounced in myocardial tissue slices. Conclusion hiPS-CBs were able to reproduce AP prolongation after Ik,r blockade, but to a lesser extent compared to human neonatal and infantile myocardial tissue slices. Early afterdepolarisations could not be induced in hiPS-CBs. Contractile force was differently regulated by β-adrenergic stimulation in hiPS-CBs and the native myocardium. If used for cardiotoxicity screening, caution is warranted as hiPS-CBs might be less sensitive to pharmacologic targets compared to the native myocardium of neonates and infants.
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7
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Schneider-Warme F, Johnston CM, Kohl P. Organotypic myocardial slices as model system to study heterocellular interactions. Cardiovasc Res 2018; 114:3-6. [PMID: 29121179 DOI: 10.1093/cvr/cvx215] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- Franziska Schneider-Warme
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Bad Krozingen, and Medical Faculty of the University of Freiburg, Elsässer Str. 2Q, 79110 Freiburg, Germany
| | - Callum M Johnston
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Bad Krozingen, and Medical Faculty of the University of Freiburg, Elsässer Str. 2Q, 79110 Freiburg, Germany
| | - Peter Kohl
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Bad Krozingen, and Medical Faculty of the University of Freiburg, Elsässer Str. 2Q, 79110 Freiburg, Germany
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8
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Watson SA, Scigliano M, Bardi I, Ascione R, Terracciano CM, Perbellini F. Preparation of viable adult ventricular myocardial slices from large and small mammals. Nat Protoc 2017; 12:2623-2639. [PMID: 29189769 DOI: 10.1038/nprot.2017.139] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This protocol describes the preparation of highly viable adult ventricular myocardial slices from the hearts of small and large mammals, including rodents, pigs, dogs and humans. Adult ventricular myocardial slices are 100- to 400-μm-thick slices of living myocardium that retain the native multicellularity, architecture and physiology of the heart. This protocol provides a list of the equipment and reagents required alongside a detailed description of the methodology for heart explantation, tissue preparation, slicing with a vibratome and handling of myocardial slices. Supplementary videos are included to visually demonstrate these steps. A number of critical steps are addressed that must be followed in order to prepare highly viable myocardial slices. These include identification of myocardial fiber direction and fiber alignment within the tissue block, careful temperature control, use of an excitation-contraction uncoupler, optimal vibratome settings and correct handling of myocardial slices. Many aspects of cardiac structure and function can be studied using myocardial slices in vitro. Typical results obtained with hearts from a small mammal (rat) and a large mammal (human) with heart failure are shown, demonstrating myocardial slice viability, maximum contractility, Ca2+ handling and structure. This protocol can be completed in ∼4 h.
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Affiliation(s)
- Samuel A Watson
- Division of Cardiovascular Sciences, Myocardial Function, National Heart and Lung Institute, Imperial College London, London, UK
| | - Martina Scigliano
- Division of Cardiovascular Sciences, Myocardial Function, National Heart and Lung Institute, Imperial College London, London, UK
| | - Ifigeneia Bardi
- Division of Cardiovascular Sciences, Myocardial Function, National Heart and Lung Institute, Imperial College London, London, UK
| | - Raimondo Ascione
- Translational Biomedical Research Centre, University of Bristol, Bristol, UK
| | - Cesare M Terracciano
- Division of Cardiovascular Sciences, Myocardial Function, National Heart and Lung Institute, Imperial College London, London, UK
| | - Filippo Perbellini
- Division of Cardiovascular Sciences, Myocardial Function, National Heart and Lung Institute, Imperial College London, London, UK
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9
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Peinkofer G, Hescheler J, Halbach M. Murine Short Axis Ventricular Heart Slices for Electrophysiological Studies. J Vis Exp 2017. [PMID: 28605368 DOI: 10.3791/55725] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Murine cardiomyocytes have been extensively used for in vitro studies of cardiac physiology and new therapeutic strategies. However, multicellular preparations of dissociated cardiomyocytes are not representative of the complex in vivo structure of cardiomyocytes, non-myocytes and extracellular matrix, which influences both mechanical and electrophysiological properties of the heart. Here we describe a technique to prepare viable ventricular slices of adult mouse hearts with a preserved in vivo like tissue structure, and demonstrate their suitability for electrophysiological recordings. After excision of the heart, ventricles are separated from the atria, perfused with Ca2+-free solution containing 2,3-butanedione monoxime and embedded in a 4% low-melt agarose block. The block is placed on a microtome with a vibrating blade, and tissue slices with a thickness of 150-400 µm are prepared keeping the vibration frequency of the blade at 60-70 Hz and moving the blade forward as slowly as possible. Thickness of the slices depends on the further application. Slices are stored in ice cold Tyrode's solution with 0.9 mM Ca2+ and 2,3-butanedione monoxime (BDM) for 30 min. Afterwards, slices are transferred to 37 °C DMEM for 30 min to wash out the BDM. Slices can be used for electrophysiological studies with sharp electrodes or micro electrode arrays, for force measurements to analyze contractile function or to investigate the interaction of transplanted stem cell-derived cardiomyocytes and host tissue. For sharp electrode recordings, a slice is placed into a 3 cm cell culture dish on the heating plate of an inverted microscope. The slice is stimulated with a unipolar electrode, and intracellular action potentials of cardiomyocytes within the slice are recorded with a sharp glass electrode.
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Affiliation(s)
- Gabriel Peinkofer
- Department of Internal Medicine III, University of Cologne; Institute for Neurophysiology, University of Cologne
| | | | - Marcel Halbach
- Department of Internal Medicine III, University of Cologne;
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10
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Peinkofer G, Burkert K, Urban K, Krausgrill B, Hescheler J, Saric T, Halbach M. From Early Embryonic to Adult Stage: Comparative Study of Action Potentials of Native and Pluripotent Stem Cell-Derived Cardiomyocytes. Stem Cells Dev 2016; 25:1397-406. [DOI: 10.1089/scd.2016.0073] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Gabriel Peinkofer
- Department of Internal Medicine III, University of Cologne, Cologne, Germany
- Institute of Neurophysiology, University of Cologne, Cologne, Germany
| | - Karsten Burkert
- Institute of Neurophysiology, University of Cologne, Cologne, Germany
| | - Katja Urban
- Department of Internal Medicine III, University of Cologne, Cologne, Germany
| | - Benjamin Krausgrill
- Department of Internal Medicine III, University of Cologne, Cologne, Germany
| | - Jürgen Hescheler
- Institute of Neurophysiology, University of Cologne, Cologne, Germany
| | - Tomo Saric
- Institute of Neurophysiology, University of Cologne, Cologne, Germany
| | - Marcel Halbach
- Department of Internal Medicine III, University of Cologne, Cologne, Germany
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11
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Haustein M, Hannes T, Trieschmann J, Verhaegh R, Köster A, Hescheler J, Brockmeier K, Adelmann R, Khalil M. Excitation-contraction coupling in zebrafish ventricular myocardium is regulated by trans-sarcolemmal Ca2+ influx and sarcoplasmic reticulum Ca2+ release. PLoS One 2015; 10:e0125654. [PMID: 25938412 PMCID: PMC4418605 DOI: 10.1371/journal.pone.0125654] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 03/17/2015] [Indexed: 01/19/2023] Open
Abstract
Zebrafish (Danio rerio) have become a popular model in cardiovascular research mainly due to identification of a large number of mutants with structural defects. In recent years, cardiomyopathies and other diseases influencing contractility of the heart have been studied in zebrafish mutants. However, little is known about the regulation of contractility of the zebrafish heart on a tissue level. The aim of the present study was to elucidate the role of trans-sarcolemmal Ca2+-flux and sarcoplasmic reticulum Ca2+-release in zebrafish myocardium. Using isometric force measurements of fresh heart slices, we characterised the effects of changes of the extracellular Ca2+-concentration, trans-sarcolemmal Ca2+-flux via L-type Ca2+-channels and Na+-Ca2+-exchanger, and Ca2+-release from the sarcoplasmic reticulum as well as beating frequency and β-adrenergic stimulation on contractility of adult zebrafish myocardium. We found an overall negative force-frequency relationship (FFR). Inhibition of L-type Ca2+-channels by verapamil (1 μM) decreased force of contraction to 22±7% compared to baseline (n=4, p<0.05). Ni2+ was the only substance to prolong relaxation (5 mM, time after peak to 50% relaxation: 73±3 ms vs. 101±8 ms, n=5, p<0.05). Surprisingly though, inhibition of the sarcoplasmic Ca2+-release decreased force development to 54±3% in ventricular (n=13, p<0.05) and to 52±8% in atrial myocardium (n=5, p<0.05) suggesting a substantial role of SR Ca2+-release in force generation. In line with this finding, we observed significant post pause potentiation after pauses of 5 s (169±7% force compared to baseline, n=8, p<0.05) and 10 s (198±9% force compared to baseline, n=5, p<0.05) and mildly positive lusitropy after β-adrenergic stimulation. In conclusion, force development in adult zebrafish ventricular myocardium requires not only trans-sarcolemmal Ca2+-flux, but also intact sarcoplasmic reticulum Ca2+-cycling. In contrast to mammals, FFR is strongly negative in the zebrafish heart. These aspects need to be considered when using zebrafish to model human diseases of myocardial contractility.
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Affiliation(s)
- Moritz Haustein
- Department of Paediatric Cardiology, Cologne Heart Centre, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
| | - Tobias Hannes
- Department of Paediatric Cardiology, Cologne Heart Centre, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
- Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
- * E-mail:
| | - Jan Trieschmann
- Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
| | - Rabea Verhaegh
- Institute of Physiological Chemistry, University Hospital Essen, Essen, North Rhine-Westphalia, Germany
| | - Annette Köster
- Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
| | - Jürgen Hescheler
- Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
| | - Konrad Brockmeier
- Department of Paediatric Cardiology, Cologne Heart Centre, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
| | - Roland Adelmann
- Department of Paediatric Cardiology, Cologne Heart Centre, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany
| | - Markus Khalil
- Department of Paediatric Cardiology, University Hospital of Giessen and Marburg, University of Giessen and Marburg, Giessen, Hessen, Germany
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12
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Wang K, Lee P, Mirams GR, Sarathchandra P, Borg TK, Gavaghan DJ, Kohl P, Bollensdorff C. Cardiac tissue slices: preparation, handling, and successful optical mapping. Am J Physiol Heart Circ Physiol 2015; 308:H1112-25. [PMID: 25595366 PMCID: PMC4551126 DOI: 10.1152/ajpheart.00556.2014] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 01/14/2015] [Indexed: 01/28/2023]
Abstract
Cardiac tissue slices are becoming increasingly popular as a model system for cardiac electrophysiology and pharmacology research and development. Here, we describe in detail the preparation, handling, and optical mapping of transmembrane potential and intracellular free calcium concentration transients (CaT) in ventricular tissue slices from guinea pigs and rabbits. Slices cut in the epicardium-tangential plane contained well-aligned in-slice myocardial cell strands (“fibers”) in subepicardial and midmyocardial sections. Cut with a high-precision slow-advancing microtome at a thickness of 350 to 400 μm, tissue slices preserved essential action potential (AP) properties of the precutting Langendorff-perfused heart. We identified the need for a postcutting recovery period of 36 min (guinea pig) and 63 min (rabbit) to reach 97.5% of final steady-state values for AP duration (APD) (identified by exponential fitting). There was no significant difference between the postcutting recovery dynamics in slices obtained using 2,3-butanedione 2-monoxime or blebistatin as electromechanical uncouplers during the cutting process. A rapid increase in APD, seen after cutting, was caused by exposure to ice-cold solution during the slicing procedure, not by tissue injury, differences in uncouplers, or pH-buffers (bicarbonate; HEPES). To characterize intrinsic patterns of CaT, AP, and conduction, a combination of multipoint and field stimulation should be used to avoid misinterpretation based on source-sink effects. In summary, we describe in detail the preparation, mapping, and data analysis approaches for reproducible cardiac tissue slice-based investigations into AP and CaT dynamics.
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Affiliation(s)
- Ken Wang
- Department of Computer Science, University of Oxford, Oxford, United Kingdom
| | - Peter Lee
- Department of Physics, University of Oxford, Clarendon Laboratory, Oxford, United Kingdom
| | - Gary R Mirams
- Department of Computer Science, University of Oxford, Oxford, United Kingdom
| | - Padmini Sarathchandra
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, Middlesex, United Kingdom
| | - Thomas K Borg
- Department of Regenerative Medicine and Cell Biology, University of South Carolina School of Medicine, Charleston, South Carolina; and
| | - David J Gavaghan
- Department of Computer Science, University of Oxford, Oxford, United Kingdom
| | - Peter Kohl
- Department of Computer Science, University of Oxford, Oxford, United Kingdom; Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, Middlesex, United Kingdom
| | - Christian Bollensdorff
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, Middlesex, United Kingdom; Qatar Cardiovascular Research Center, Qatar Foundation, Doha, Qatar
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13
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Lupu M, Khalil M, Iordache F, Andrei E, Pfannkuche K, Spitkovsky D, Baumgartner S, Rubach M, Abdelrazik H, Buzila C, Brockmeier K, Simionescu M, Hescheler J, Maniu H. Direct contact of umbilical cord blood endothelial progenitors with living cardiac tissue is a requirement for vascular tube-like structures formation. J Cell Mol Med 2012; 15:1914-26. [PMID: 21029374 PMCID: PMC3918047 DOI: 10.1111/j.1582-4934.2010.01197.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The umbilical cord blood derived endothelial progenitor cells (EPCs) contribute to vascular regeneration in experimental models of ischaemia. However, their ability to participate in cardiovascular tissue restoration has not been elucidated yet. We employed a novel coculture system to investigate whether human EPCs have the capacity to integrate into living and ischaemic cardiac tissue, and participate to neovascularization. EPCs were cocultured with either living or ischaemic murine embryonic ventricular slices, in the presence or absence of a pro-angiogenic growth factor cocktail consisting of VEGF, IGF-1, EGF and bFGF. Tracking of EPCs within the cocultures was performed by cell transfection with green fluorescent protein or by immunostaining performed with anti-human vWF, CD31, nuclei and mitochondria antibodies. EPCs generated vascular tube-like structures in direct contact with the living ventricular slices. Furthermore, the pro-angiogenic growth factor cocktail reduced significantly tubes formation. Coculture of EPCs with the living ventricular slices in a transwell system did not lead to vascular tube-like structures formation, demonstrating that the direct contact is necessary and that the soluble factors secreted by the living slices were not sufficient for their induction. No vascular tubes were formed when EPCs were cocultured with ischaemic ventricular slices, even in the presence of the pro-angiogenic cocktail. In conclusion, EPCs form vascular tube-like structures in contact with living cardiac tissue and the direct cell-to-cell interaction is a prerequisite for their induction. Understanding the cardiac niche and micro-environmental interactions that regulate EPCs integration and neovascularization are essential for applying these cells to cardiovascular regeneration.
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Affiliation(s)
- Marilena Lupu
- Institute of Cellular Biology and Pathology 'Nicolae Simionescu', Bucharest, Romania Institute for Neurophysiology, University of Cologne, Cologne, Germany
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14
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Kraushaar U, Meyer T, Hess D, Gepstein L, L Mummery C, R Braam S, Guenther E. Cardiac safety pharmacology: from human ether-a-gogo related gene channel block towards induced pluripotent stem cell based disease models. Expert Opin Drug Saf 2011; 11:285-98. [DOI: 10.1517/14740338.2012.639358] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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de Lange WJ, Hegge LF, Grimes AC, Tong CW, Brost TM, Moss RL, Ralphe JC. Neonatal mouse-derived engineered cardiac tissue: a novel model system for studying genetic heart disease. Circ Res 2011; 109:8-19. [PMID: 21566213 DOI: 10.1161/circresaha.111.242354] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
RATIONALE Cardiomyocytes cultured in a mechanically active 3-dimensional configuration can be used for studies that correlate contractile performance to cellular physiology. Current engineered cardiac tissue (ECT) models use cells derived from either rat or chick hearts. Development of a murine ECT would provide access to many existing models of cardiac disease and open the possibility of performing targeted genetic manipulation with the ability to directly assess contractile and molecular variables. OBJECTIVE To generate, characterize, and validate mouse ECT with a physiologically relevant model of hypertrophic cardiomyopathy. METHODS AND RESULTS We generated mechanically integrated ECT using isolated neonatal mouse cardiac cells derived from both wild-type and myosin-binding protein C (cMyBP-C)-null mouse hearts. The murine ECTs produced consistent contractile forces that followed the Frank-Starling law and accepted physiological pacing. cMyBP-C-null ECTs showed characteristic acceleration of contraction kinetics. Adenovirus-mediated expression of human cMyBP-C in murine cMyBP-C-null ECT restored contractile properties to levels indistinguishable from those of wild-type ECT. Importantly, the cardiomyocytes used to construct the cMyBP-C(-/-) ECT had yet to undergo the significant hypertrophic remodeling that occurs in vivo. Thus, this murine ECT model reveals a contractile phenotype that is specific to the genetic mutation rather than to secondary remodeling events. CONCLUSIONS Data presented here show mouse ECT to be an efficient and cost-effective platform to study the primary effects of genetic manipulation on cardiac contractile function. This model provides a previously unavailable tool to study specific sarcomeric protein mutations in an intact mammalian muscle system.
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Affiliation(s)
- W J de Lange
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
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16
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Xi J, Khalil M, Spitkovsky D, Hannes T, Pfannkuche K, Bloch W, Sarić T, Brockmeier K, Hescheler J, Pillekamp F. Fibroblasts support functional integration of purified embryonic stem cell-derived cardiomyocytes into avital myocardial tissue. Stem Cells Dev 2011; 20:821-30. [PMID: 21142494 DOI: 10.1089/scd.2010.0398] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Transplantation of purified pluripotent stem cell-derived cardiomyocytes into damaged myocardium might become a therapy to improve contractile function after myocardial infarction. However, engraftment remains problematic. Aim of this study was to investigate whether murine embryonic fibroblasts (MEFs) support the functional integration of purified embryonic stem cell-derived cardiomyocytes (ES-CMs). Neonatal murine ventricular tissue slices were subjected to oxygen and glucose deprivation to simulate irreversible ischemia. Vital tissue slices served as control. Vital and avital tissue slices were cultured with or without MEFs before coculturing with clusters of puromycin-selected ES-CMs. Integration of ES-CM clusters was assessed morphologically, motility by long-term microscopy, and functional integration by isometric force measurements. We observed a good morphological integration into vital but a poor integration into avital slices. Adding MEFs improved morphological integration into irreversibly damaged slices and enabled purified ES-CMs to migrate and to confer force. We conclude that noncardiomyocytes like MEFs support morphological integration and force transmission of purified ES-CMs by enabling adhesion and migration.
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Affiliation(s)
- Jiaoya Xi
- Institute for Neurophysiology, University of Cologne, Cologne, Germany
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17
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Lupu M, Khalil M, Andrei E, Iordache F, Pfannkuche K, Neef K, Georgescu A, Buzila C, Brockmeier K, Maniu H, Hescheler J. Integration Properties of Wharton’s Jelly-derived Novel Mesenchymal Stem Cells into Ventricular Slices of Murine Hearts. Cell Physiol Biochem 2011; 28:63-76. [DOI: 10.1159/000331714] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/18/2011] [Indexed: 02/06/2023] Open
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Meyer T, Stuerz K, Guenther E, Edamura M, Kraushaar U. Cardiac slices as a predictive tool for arrhythmogenic potential of drugs and chemicals. Expert Opin Drug Metab Toxicol 2010; 6:1461-75. [PMID: 21067457 DOI: 10.1517/17425255.2010.526601] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
IMPORTANCE OF THE FIELD cardiac arrhythmia represents one of the primary safety pharmacological concerns in drug development. The most prominent example is drug induced ventricular tachycardia of the Torsade des Pointes type. The mechanism how this type of arrhythmia develops is a complex multi-cellular phenomenon. It can only be insufficiently reflected by cellular or molecular assays. However, organ models - such as Langendorff hearts - or in vivo experiments are expensive and time consuming and not suitable for assays requiring an increased throughput. AREAS COVERED IN THIS REVIEW here, we describe and review an assay bridging the gap between cardiomyocyte based assays and organ based systems - cardiac slices. This assay is reviewed in direct comparison with established safety pharmacological assays. WHAT THE READER WILL GAIN while slices have played an important role in brain research for > 2 decades, cardiac slices are experiencing a renaissance due to the novel challenges in safety pharmacology just in the last few years. Cardiac slices can be cultured and recorded over several days. It is possible to access electrophysiological data with a high number of electrodes - up to 256 electrodes - embedded in the surface of a microelectrode array. TAKE HOME MESSAGE cardiac slices close the gap between cellular and organ based assays in cardiac safety pharmacology. The tissue properties of a functional cardiac syncytium are more accurately reflected by a slice rather than a single cell.
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Affiliation(s)
- Thomas Meyer
- Multi Channel Systems MCS GmbH, Aspenhaustr. 21, 72770 Reutlingen, Germany.
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de Boer TP, Camelliti P, Ravens U, Kohl P. Myocardial tissue slices: organotypic pseudo-2D models for cardiac research & development. Future Cardiol 2010; 5:425-30. [PMID: 19715406 DOI: 10.2217/fca.09.32] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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20
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Xi J, Khalil M, Shishechian N, Hannes T, Pfannkuche K, Liang H, Fatima A, Haustein M, Suhr F, Bloch W, Reppel M, Sarić T, Wernig M, Jänisch R, Brockmeier K, Hescheler J, Pillekamp F. Comparison of contractile behavior of native murine ventricular tissue and cardiomyocytes derived from embryonic or induced pluripotent stem cells. FASEB J 2010; 24:2739-51. [PMID: 20371616 DOI: 10.1096/fj.09-145177] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Cardiomyocytes generated from embryonic stem cells (ESCs) and induced pluripotent stem (iPS) cells are suggested for repopulation of destroyed myocardium. Because contractile properties are crucial for functional regeneration, we compared cardiomyocytes differentiated from ES cells (ESC-CMs) and iPS cells (iPS-CMs). Native myocardium served as control. Murine ESCs or iPS cells were differentiated 11 d in vitro and cocultured 5-7 d with irreversibly injured myocardial tissue slices. Vital embryonic ventricular tissue slices of similar age served for comparison. Force-frequency relationship (FFR), effects of Ca(2+), Ni(2+), nifedipine, ryanodine, beta-adrenergic, and muscarinic modulation were studied during loaded contractions. FFR was negative for ESC-CMs and iPS-CMs. FFR was positive for embryonic tissue and turned negative after treatment with ryanodine. In all groups, force of contraction and relaxation time increased with the concentration of Ca(2+) and decreased with nifedipine. Force was reduced by Ni(2+). Isoproterenol (1 microM) increased the force most pronounced in embryonic tissue (207+/-31%, n=7; ESC-CMs: 123+/-5%, n=4; iPS-CMs: 120+/-4%, n=8). EC(50) values were similar. Contractile properties of iPS-CMs and ESC-CMs were similar, but they were significantly different from ventricular tissue of comparable age. The results indicate immaturity of the sarcoplasmic reticulum and the beta-adrenergic response of iPS-CMs and ESC-CMs.
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Affiliation(s)
- Jiaoya Xi
- Institute for Neurophysiology, University of Cologne, Cologne, Germany
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Report and recommendations of the workshop of the European Centre for the Validation of Alternative Methods for Drug-Induced Cardiotoxicity. Cardiovasc Toxicol 2009; 9:107-25. [PMID: 19572114 DOI: 10.1007/s12012-009-9045-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Accepted: 04/17/2009] [Indexed: 10/20/2022]
Abstract
Cardiotoxicity is among the leading reasons for drug attrition and is therefore a core subject in non-clinical and clinical safety testing of new drugs. European Centre for the Validation of Alternative Methods held in March 2008 a workshop on "Alternative Methods for Drug-Induced Cardiotoxicity" in order to promote acceptance of alternative methods reducing, refining or replacing the use of laboratory animals in this field. This review reports the outcome of the workshop. The participants identified the major clinical manifestations, which are sensitive to conventional drugs, to be arrhythmias, contractility toxicity, ischaemia toxicity, secondary cardiotoxicity and valve toxicity. They gave an overview of the current use of alternative tests in cardiac safety assessments. Moreover, they elaborated on new cardiotoxicological endpoints for which alternative tests can have an impact and provided recommendations on how to cover them.
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