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Moore NP, Bogaards JJP, Buscher BAP, Wolterbeek APM, Cnubben NHP. Disposition of glycolic acid into the embryo following oral administration of ethylene glycol during placentation in the rat and rabbit. Toxicol Sci 2024; 198:31-39. [PMID: 38175793 DOI: 10.1093/toxsci/kfad135] [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] [Indexed: 01/06/2024] Open
Abstract
In order to evaluate the role of the placenta in the etiology of ethylene glycol (EG) developmental toxicity, the distribution of EG and its main metabolites, glycolic acid (GA) and oxalic acid (OX), into the conceptus was determined at the beginning and completion of placentation in the rat and rabbit. Two groups (n = 28) of timed-pregnant Wistar rats were administered EG (1000 mg/kg bw/day, oral gavage) from gestation day (GD) 6 to either GD 11 or GD 16; similarly, two groups (n = 28) of timed-pregnant New Zealand White rabbits were administered EG from GD 6 to either GD 10 or GD 19. Four animals from each group were sacrificed at 1, 3, 6, 9, 12, 18, or 24 h after the final administration, and maternal blood, extraembryonic fluid, and embryonic tissue were removed for analysis of EG, GA, and OX. The three analytes were predominantly cleared from all compartments in both species within 24 h. Neither EG nor OX preferentially accumulated into the conceptus compartments, compared with the maternal blood, in either species. Critically, GA was preferentially accumulated from the maternal blood only into the rat embryo at GD 11, but not at GD 16 and not into the rabbit embryo at either GD 10 or GD 19. The accumulation of GA into the rat embryo, and its decline over the course of placentation, is discussed in relation to the expression of monocarboxylate transporter isoforms across the syncytiotrophoblast.
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Danielsson B, Vargesson N, Danielsson C. Teratogenicity and Reactive Oxygen Species after transient embryonic hypoxia: Experimental and clinical evidence with focus on drugs causing failed abortion in humans. Reprod Toxicol 2023; 122:108488. [PMID: 37852333 DOI: 10.1016/j.reprotox.2023.108488] [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: 06/19/2023] [Revised: 10/08/2023] [Accepted: 10/11/2023] [Indexed: 10/20/2023]
Abstract
Teratogenicity and Reactive Oxygen Species after transient embryonic hypoxia: Experimental and clinical evidence with focus on drugs with human abortive potential. Reactive Oxygen Species (ROS) can be harmful to embryonic tissues. The adverse embryonic effects are dependent on the severity and duration of the hypoxic event and when during organongenesis hypoxia occurs. The vascular endothelium of recently formed arteries in the embryo is highly susceptible to ROS damage. Endothelial damage results in vascular disruption, hemorrhage and maldevelopment of organs, which normally should have been supplied by the artery. ROS can also induce irregular heart rhythm in the embryo resulting in alterations in blood flow and pressure from when the tubular heart starts beating. Such alterations in blood flow and pressure during cardiogenesis can result in a variety of cardiovascular defects, for example transpositions and ventricular septal defects. One aim of this article is to review and compare the pattern of malformations produced by transient embryonic hypoxia of various origins in animal studies with malformations associated with transient embryonic hypoxia in human pregnancy due to a failed abortion process. The results show that transient hypoxia and compounds with potential to cause failed abortion in humans, such as misoprostol and hormone pregnancy tests (HPTs) like Primodos, have been associated with a similar spectrum of teratogenicity. The spectrum includes limb reduction-, cardiovascular- and central nervous system defects. The hypoxia-ROS related teratogenicity of misoprostol and HPTs, is likely to be secondary to uterine contractions and compression of uterinoplacental/embryonic vessels during organogenesis.
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Affiliation(s)
- Bengt Danielsson
- BeDa Consulting AB, Upplandsgatan 6, SE-111 23 Stockholm, Sweden.
| | - Neil Vargesson
- Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK
| | - Christian Danielsson
- Department of Patient Safety, Swedish National Board of Health and Welfare, SE-106 30 Stockholm, Sweden
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Ritchie HE, Polson JW, Xia A, Webster W. Effect of vinpocetine on embryonic heart rate in vitro. Curr Res Toxicol 2023; 5:100125. [PMID: 37753450 PMCID: PMC10518341 DOI: 10.1016/j.crtox.2023.100125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 09/11/2023] [Accepted: 09/14/2023] [Indexed: 09/28/2023] Open
Abstract
Vinpocetine is a readily available nutritional supplement claimed to improve memory and weight loss. However, it blocks the Ikr current essential for cardiac action potential repolarisation and Ikr inhibition can cause "torsade de pointes" arrhythmias and sudden death. Moreover, Ikr blockers have exhibited teratogenic effects in reproductive toxicology studies, leading to increased birth defects and embryonic mortality. The FDA advises against vinpocetine use in pregnant and prospective mothers based on animal studies showing dose-dependent fetal mortality in rats and rabbits, and cardiovascular malformations in surviving fetuses. However, the mechanisms responsible for vinpocetine's fetal toxicity remain unclear. The present study used rat embryo culture to evaluate vinpocetine and its major metabolite, apovincaminic acid, on embryonic heart rate, a possible causative factor behind its adverse effects. Both compounds induced embryonic bradycardia in a concentration-dependent manner, with vinpocetine proving more potent. The minimum vinpocentine concentration to induce bradycardia was 100 nM, a level unlikely to be reached in humans following typical doses. Embryonic arrhythmias were also observed at the highest concentrations. These results suggest that the FDA's cautionary statement may generate undue anxiety, although re-evaluation of teratogenicity risk associated with vinpocetine should be revisited if a link to cardiac arrhythmias in adults is established.
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Affiliation(s)
- Helen Elizabeth Ritchie
- School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, NSW, Australia
| | - Jaimie W. Polson
- School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, NSW, Australia
| | - Andrea Xia
- School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, NSW, Australia
| | - William Webster
- School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, NSW, Australia
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Verkerk AO, Wilders R. Human Sinoatrial Node Pacemaker Activity: Role of the Slow Component of the Delayed Rectifier K + Current, I Ks. Int J Mol Sci 2023; 24:7264. [PMID: 37108427 PMCID: PMC10138838 DOI: 10.3390/ijms24087264] [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: 03/22/2023] [Revised: 04/07/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
The pacemaker activity of the sinoatrial node (SAN) has been studied extensively in animal species but is virtually unexplored in humans. Here we assess the role of the slowly activating component of the delayed rectifier K+ current (IKs) in human SAN pacemaker activity and its dependence on heart rate and β-adrenergic stimulation. HEK-293 cells were transiently transfected with wild-type KCNQ1 and KCNE1 cDNA, encoding the α- and β-subunits of the IKs channel, respectively. KCNQ1/KCNE1 currents were recorded both during a traditional voltage clamp and during an action potential (AP) clamp with human SAN-like APs. Forskolin (10 µmol/L) was used to increase the intracellular cAMP level, thus mimicking β-adrenergic stimulation. The experimentally observed effects were evaluated in the Fabbri-Severi computer model of an isolated human SAN cell. Transfected HEK-293 cells displayed large IKs-like outward currents in response to depolarizing voltage clamp steps. Forskolin significantly increased the current density and significantly shifted the half-maximal activation voltage towards more negative potentials. Furthermore, forskolin significantly accelerated activation without affecting the rate of deactivation. During an AP clamp, the KCNQ1/KCNE1 current was substantial during the AP phase, but relatively small during diastolic depolarization. In the presence of forskolin, the KCNQ1/KCNE1 current during both the AP phase and diastolic depolarization increased, resulting in a clearly active KCNQ1/KCNE1 current during diastolic depolarization, particularly at shorter cycle lengths. Computer simulations demonstrated that IKs reduces the intrinsic beating rate through its slowing effect on diastolic depolarization at all levels of autonomic tone and that gain-of-function mutations in KCNQ1 may exert a marked bradycardic effect during vagal tone. In conclusion, IKs is active during human SAN pacemaker activity and has a strong dependence on heart rate and cAMP level, with a prominent role at all levels of autonomic tone.
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Affiliation(s)
- Arie O. Verkerk
- Department of Medical Biology, Amsterdam Cardiovascular Sciences, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands;
- Department of Experimental Cardiology, Heart Center, Amsterdam Cardiovascular Sciences, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Ronald Wilders
- Department of Medical Biology, Amsterdam Cardiovascular Sciences, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands;
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Sun M, Zhang S, Li Y, Chen L, Diao J, Li J, Wei J, Song X, Liu Y, Shu J, Wang T, Huang P, Qin J. Effect of Maternal Antidepressant Use During the Pre-pregnancy/Early Pregnancy Period on Congenital Heart Disease: A Prospective Cohort Study in Central China. Front Cardiovasc Med 2022; 9:916882. [PMID: 35865384 PMCID: PMC9294218 DOI: 10.3389/fcvm.2022.916882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 06/09/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundWith the increase in maternal antidepressant prescribing before/during pregnancy, concerns about the safety of antidepressants have come into focus. The purpose of this study was to explore the association between maternal antidepressant use before pregnancy/in early pregnancy and the risk of congenital heart disease (CHD) in children, and to provide a scientific basis for clinical safety of antidepressant use.MethodsThe prospective cohort study ultimately included 34,104 singleton pregnancies. Modified Poisson regression model with robust error variances was used to evaluate RRs and 95% confidence intervals (CIs) for the risk of CHD in offspring exposed to maternal antidepressant in the 3 months before pregnancy and early pregnancy. In addition, sensitivity analysis was further performed to explore the robustness of the results.ResultsIn this study, the maternal antidepressant exposure rate was 2.83% in the 3 months before pregnancy, 2.42% in early pregnancy, and the incidence of CHD was 8.973 per 1,000 live births. We found that maternal antidepressant use in the 3 months before pregnancy and early pregnancy were all associated with an increased risk of CHD, ~2.54 times and 2.87 times, respectively, of non-use of antidepressants after adjusting for potential confounders. This association was also found in CHD specific phenotypic analysis. Of these, offspring whose mothers were exposed to antidepressants in the 3 months before pregnancy had the highest risk of transposition of the great arteries (aOR = 5.50, 95% CI: 1.91–15.88). The offspring of mothers exposed to antidepressants in early pregnancy had the highest risk of developing ventricular septal defect (aOR = 4.80, 95% CI: 2.50–9.24). Sensitivity analysis verified the stability of the results.ConclusionsMaternal antidepressant use in the 3 months before pregnancy and early pregnancy were all associated with an increased risk of CHD in their offspring. In order to reduce the risk of teratogenesis, we recommend that pregnant women prepare for pregnancy after their condition improves or receive the minimum effective dose of medication.
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Affiliation(s)
- Mengting Sun
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Senmao Zhang
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Yihuan Li
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Letao Chen
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Jingyi Diao
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Jinqi Li
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Jianhui Wei
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Xinli Song
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Yiping Liu
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Jing Shu
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Tingting Wang
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
- NHC Key Laboratory of Birth Defect for Research and Prevention, Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China
- *Correspondence: Tingting Wang ; orcid.org/0000-0003-1689-7257
| | - Peng Huang
- Department of Cardiothoracic Surgery, Hunan Children's Hospital, Changsha, China
- Peng Huang ; orcid.org/0000-0001-6015-6371
| | - Jiabi Qin
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
- NHC Key Laboratory of Birth Defect for Research and Prevention, Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China
- Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- Hunan Provincial Key Laboratory of Clinical Epidemiology, Changsha, China
- Jiabi Qin ; orcid.org/0000-0002-9360-4991
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When Does the Human Embryonic Heart Start Beating? A Review of Contemporary and Historical Sources of Knowledge about the Onset of Blood Circulation in Man. J Cardiovasc Dev Dis 2022; 9:jcdd9060187. [PMID: 35735816 PMCID: PMC9225347 DOI: 10.3390/jcdd9060187] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 11/17/2022] Open
Abstract
The onset of embryonic heart beating may be regarded as the defining feature for the beginning of personal human life. Clarifying the timing of the first human heartbeat, therefore, has religious, philosophical, ethical, and medicolegal implications. This article reviews the historical and contemporary sources of knowledge on the beginning of human heart activity. Special attention is given to the problem of the determination of the true age of human embryos and to the problem of visualization of the human embryonic heart activity. It is shown that historical and current textbook statements about the onset of blood circulation in man do not derive from observations on living human embryos but derive from the extrapolation of observations on animal embryos to the human species. This fact does not preclude the existence of documented observations on human embryonic heart activity: Modern diagnostic (ultrasound) and therapeutic (IVF) procedures facilitate the visualization of early embryonic heart activity in precisely dated pregnancies. Such studies showed that the human heart started its pumping action during the fourth post-fertilization week. A small number of direct observations on the heart activity of aborted human embryos were reported since the 19th century, but did not receive much recognition by embryologists.
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Leke AZ, Dolk H, Loane M, Casson K, Nelen V, Barišić I, Garne E, Rissman A, O'Mahony M, Neville AJ, Pierini A, Bergman JEH, Klungsøyr K, Materna-Kiryluk A, Bielenska AL, Carbonell CC, Addor MC, Tucker D. Macrolide and lincosamide antibiotic exposure in the first trimester of pregnancy and risk of congenital anomaly: A European case-control study. Reprod Toxicol 2021; 100:101-108. [PMID: 33454317 DOI: 10.1016/j.reprotox.2021.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 01/14/2023]
Abstract
This study investigated the risk of congenital heart defects (CHD) and other congenital anomalies (CA) associated with first trimester use of macrolide antibiotics (mainly erythromycin, spiramycin, clarithromycin and azithromycin) and lincosamides (clindamycin) using a case-malformed control design. Data included 145,936 babies with a CA diagnosis (livebirths, stillbirths and terminations of pregnancy for CA) from 15 population-based EUROCAT registries in 13 European countries, covering 9 million births 1995-2012. Cases were babies with CHD, anencephaly, orofacial clefts, genital and limb reduction anomalies associated with antibiotic exposure in the literature. Controls were babies with other CA or genetic conditions. Main outcomes were odds ratios adjusted (AOR) for maternal age and registry, with 95 % Confidence Intervals (95 %CI). Macrolide and lincosamide exposure was recorded for 307 and 28 cases, 72 and 4 non-genetic controls, 57 and 7 genetic controls, respectively. AOR for CHD was not significantly raised (AOR 0.94, 95 %CI: 0.70-1.26 vs non-genetic controls; AOR 1.01, 95 %CI: 0.73-1.41 vs genetic controls), nor significantly raised for any specific macrolide. The risk of atrioventricular septal defect was significantly raised with exposure to any macrolide (AOR 2.98; 95 %CI: 1.48-6.01), erythromycin (AOR 3.68, 95 %CI: 1.28-10.61), and azithromycin (AOR 4.50, 95 %CI: 1.30-15.58). Erythromycin, clarithromycin, azithromycin, and clindamycin were associated with an increased risk of at least one other CA. Further research is needed on the risk of specific CA associated with macrolide and lincosamide use in the first trimester, particularly relevant for the potential use of azithromycin in the treatment of COVID-19.
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Affiliation(s)
- Aminkeng Zawuo Leke
- Centre for Maternal, Fetal and Infant Research, Institute for Nursing and Health Research, Ulster University, United Kingdom.
| | - Helen Dolk
- Centre for Maternal, Fetal and Infant Research, Institute for Nursing and Health Research, Ulster University, United Kingdom
| | - Maria Loane
- Centre for Maternal, Fetal and Infant Research, Institute for Nursing and Health Research, Ulster University, United Kingdom
| | - Karen Casson
- Centre for Maternal, Fetal and Infant Research, Institute for Nursing and Health Research, Ulster University, United Kingdom
| | - Vera Nelen
- Provinciaal Instituut voor Hygiëne, Antwerp, Belgium
| | - Ingeborg Barišić
- Children's Hospital Zagreb, Centre of Excellence for Reproductive and Regenerative Medicine, Medical School University of Zagreb, Croatia, Zagreb, Croatia
| | - Ester Garne
- Paediatric Department Hospital, Lillebaelt Skovvangen, Kolding, Denmark
| | - Anke Rissman
- Malformation Monitoring Centre Saxony-Anhalt, Medical Faculty Otto-von-Guericke University Magdeburg, Germany
| | - Mary O'Mahony
- Medicine Department of Public Health, St Finbarr's Hospital Douglas Road, Cork, Ireland
| | - Amanda J Neville
- IMER Registry (Emila Romagna Registry of Birth Defects), Center for Clinical and Epidemiological Research, University of Ferrara - Azienda Ospedaliero - Universitaria di Ferrara, Corso della Giovecca, Ferrara, Italy
| | - Anna Pierini
- Tuscany Registry of Congenital Defects, CNR Institute of Clinical Physiology/Fondazione Toscana Gabriele Monasterio, Pisa, Italy
| | - Jorieke E H Bergman
- Department of Medical Genetics, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Kari Klungsøyr
- Medical Birth Registry of Norway, Kalfarveien, Bergen, Norway
| | - Anna Materna-Kiryluk
- Polish Registry of Congenital Malformations, Department of Medical Genetics, Poznan University of Medical Sciences, Poznan, Poland
| | - Anna Latos Bielenska
- Poznan University of Medical Sciences, Department of Medical Genetics, 8 Rokietnicka Street, 60-806, Poznan, Poland
| | - Clara Cavero Carbonell
- Rare Diseases Research Unit, Foundation for the Promotion of Health and Biomedical Research in the Valencian Region, Valencia, Spain
| | - Marie-Claude Addor
- Registre Vaudois des Malformations EUROCAT Department of Woman-Mother-Child, Maternité, Lausanne, Switzerland
| | - David Tucker
- Congenital Anomaly Register & Information Service, Level 3 West Wing, Singleton Hospital, Sketty Lane, Swansea, United Kingdom
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8
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Bektik E, Cowan DB, Wang DZ. Long Non-Coding RNAs in Atrial Fibrillation: Pluripotent Stem Cell-Derived Cardiomyocytes as a Model System. Int J Mol Sci 2020; 21:ijms21155424. [PMID: 32751460 PMCID: PMC7432754 DOI: 10.3390/ijms21155424] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/27/2020] [Accepted: 07/28/2020] [Indexed: 12/19/2022] Open
Abstract
Atrial fibrillation (AF) is a type of sustained arrhythmia in humans often characterized by devastating alterations to the cardiac conduction system as well as the structure of the atria. AF can lead to decreased cardiac function, heart failure, and other complications. Long non-coding RNAs (lncRNAs) have been shown to play important roles in the cardiovascular system, including AF; however, a large group of lncRNAs is not conserved between mouse and human. Furthermore, AF has complex networks showing variations in mechanisms in different species, making it challenging to utilize conventional animal models to investigate the functional roles and potential therapeutic benefits of lncRNAs for AF. Fortunately, pluripotent stem cell (PSC)-derived cardiomyocytes (CMs) offer a reliable platform to study lncRNA functions in AF because of certain electrophysiological and molecular similarities with native human CMs. In this review, we first summarize the broad aspects of lncRNAs in various heart disease settings, then focus on their potential roles in AF development and pathophysiology. We also discuss current uses of PSCs in AF research and describe how these studies could be developed into novel therapeutics for AF and other cardiovascular diseases.
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Affiliation(s)
- Emre Bektik
- Department of Cardiology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood, Boston, MA 02115, USA; (E.B.); (D.B.C.)
| | - Douglas B. Cowan
- Department of Cardiology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood, Boston, MA 02115, USA; (E.B.); (D.B.C.)
| | - Da-Zhi Wang
- Department of Cardiology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood, Boston, MA 02115, USA; (E.B.); (D.B.C.)
- Harvard Stem Cell Institute, Harvard University, Cambridge, MA 02138, USA
- Correspondence:
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9
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Şengül Ayan S, Sırcan AK, Abewa M, Kurt A, Dalaman U, Yaraş N. Mathematical model of the ventricular action potential and effects of isoproterenol-induced cardiac hypertrophy in rats. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2020; 49:323-342. [PMID: 32462262 DOI: 10.1007/s00249-020-01439-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 04/21/2020] [Accepted: 05/17/2020] [Indexed: 12/16/2022]
Abstract
Mathematical action potential (AP) modeling is a well-established but still-developing area of research to better understand physiological and pathological processes. In particular, changes in AP mechanisms in the isoproterenol (ISO) -induced hypertrophic heart model are incompletely understood. Here we present a mathematical model of the rat AP based on recordings from rat ventricular myocytes. In our model, for the first time, all channel kinetics are defined with a single type of function that is simple and easy to apply. The model AP and channels dynamics are consistent with the APs recorded from rats for both Control (absence of ISO) and ISO-treated cases. Our mathematical model helps us to understand the reason for the prolongation in AP duration after ISO application while ISO treatment helps us to validate our mathematical model. We reveal that the smaller density and the slower gating kinetics of the transient K+ current help explain the prolonged AP duration after ISO treatment and the increasing amplitude of the rapid and the slow inward rectifier currents also contribute to this prolongation alongside the flux in Ca2+ currents. ISO induced an increase in the density of the Na+ current that can explain the faster upstroke. We believe that AP dynamics from rat ventricular myocytes can be reproduced very well with this mathematical model and that it provides a powerful tool for improved insights into the underlying dynamics of clinically important AP properties such as ISO application.
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Affiliation(s)
- Sevgi Şengül Ayan
- Department of Engineering, Industrial Engineering, Antalya Bilim University, Döşemealtı, Antalya, Turkey.
| | - Ahmet K Sırcan
- Department of Engineering, Electrical and Computer Engineering, Antalya Bilim University, Döşemealtı, Antalya, Turkey
| | - Mohamedou Abewa
- Department of Engineering, Electrical and Computer Engineering, Antalya Bilim University, Döşemealtı, Antalya, Turkey
| | - Ahmet Kurt
- Department of Engineering, Electrical and Computer Engineering, Florida International University, Miami, USA
| | - Uğur Dalaman
- Department of Biophysics, Akdeniz University College of Medicine, Akdeniz University, Antalya, Turkey
| | - Nazmi Yaraş
- Department of Biophysics, Akdeniz University College of Medicine, Akdeniz University, Antalya, Turkey
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10
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Liu G, Yang Z, Chen W, Xu J, Mao L, Yu Q, Guo J, Xu H, Liu F, Sun Y, Huang H, Peng Z, Sun J, Li W, Yang P. Novel missense variant in TTN cosegregating with familial atrioventricular block. Eur J Med Genet 2019; 63:103752. [PMID: 31470098 DOI: 10.1016/j.ejmg.2019.103752] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/21/2019] [Accepted: 08/24/2019] [Indexed: 01/24/2023]
Abstract
BACKGROUND Cardiovascular diseases are the most common cause of death globally. In which atrioventricular block (AVB) is a common disorder with genetic causes, but the responsible genes have not been fully identified yet. To determine the underlying causative genes involved in cardiac AVB, here we report a three-generation Chinese family with severe autosomal dominant cardiac AVB that has been ruled out as being caused by known genes mutations. METHODS Whole-exome sequencing was performed in five affected family members across three generations, and co-segregation analysis was validated on other members of this family. RESULTS Whole-exome sequencing and subsequent co-segregation validation identified a novel germline heterozygous point missense mutation, c.49287C > A (p.N16429K), in the titin (TTN, NM_001267550.2) gene in all 5 affected family members but not in the unaffected family members, neither in the large population according to the Genome Aggregation Database (https://gnomad.broadinstitute.org/). The point mutation is predicted to be functionally deleterious by in-silico software tools. Our finding was further supported by the conservative analysis across species. CONCLUSION Based on this study, TTN was identified as a potential novel candidate gene for autosomal dominant AVB; this study expands the mutational spectrum of TTN gene and is the first to implicate TTN mutations as AVB disease causing in a Chinese pedigree.
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Affiliation(s)
- Guohui Liu
- Department of Cardiology, China-Japan Union Hospital, Jilin University, Changchun, 100029, Jilin Province, China; Jilin Provincial Key Laboratory for Genetic Diagnosis of Cardiovascular Disease, USA
| | - Ziying Yang
- Tianjin Medical Laboratory, BGI-Tianjin, BGI-Shenzhen, Tianjin, 300308, China; Binhai Genomics Institute, BGI-Tianjin, BGI Shenzhen, Tianjin, 300308, China; James D. Watson Institute of Genome Sciences, Hangzhou, 310058, China
| | - Weiwei Chen
- Department of Cardiology, China-Japan Union Hospital, Jilin University, Changchun, 100029, Jilin Province, China; Jilin Provincial Key Laboratory for Genetic Diagnosis of Cardiovascular Disease, USA
| | - Junguang Xu
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Liangwei Mao
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Qinlin Yu
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China; Department of Molecular Cell Biology, UC Berkeley, Berkeley, CA, 94704, USA
| | - Jian Guo
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Hui Xu
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Fengxia Liu
- Tianjin Medical Laboratory, BGI-Tianjin, BGI-Shenzhen, Tianjin, 300308, China; Binhai Genomics Institute, BGI-Tianjin, BGI Shenzhen, Tianjin, 300308, China
| | - Yan Sun
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Hui Huang
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Zhiyu Peng
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Jun Sun
- Tianjin Medical Laboratory, BGI-Tianjin, BGI-Shenzhen, Tianjin, 300308, China; Binhai Genomics Institute, BGI-Tianjin, BGI Shenzhen, Tianjin, 300308, China; James D. Watson Institute of Genome Sciences, Hangzhou, 310058, China
| | - Wei Li
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China.
| | - Ping Yang
- Department of Cardiology, China-Japan Union Hospital, Jilin University, Changchun, 100029, Jilin Province, China; Jilin Provincial Key Laboratory for Genetic Diagnosis of Cardiovascular Disease, USA.
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11
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The effect of anti-emetic drugs on rat embryonic heart activity. Reprod Toxicol 2019; 87:140-145. [PMID: 31199962 DOI: 10.1016/j.reprotox.2019.06.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 06/05/2019] [Accepted: 06/10/2019] [Indexed: 02/07/2023]
Abstract
Nausea and vomiting of pregnancy (NVP) is the most common medical complaint during pregnancy affecting up to 70% of pregnant women worldwide. Some antiemetic medications (AEM) (droperidol, domperidone, granisetron, metoclopramide and trifluoperazine) used to treat NVP have the unwanted side effect of hERG blockade. The hERG potassium channel is essential for normal heart rhythm in both the adult human and the human and rat embryo. Animal studies show hERG blockade in the embryo causes bradycardia and arrhythmia leading to cardiovascular malformations and other birth defects. Whole rat embryo in vitro culture was used to determine the effect of the above listed AEM and meclizine on the heart rate of Gestational day 13 rat embryos. These embryos are similar in size and heart development to 5-6-week human embryo. The results showed that all of the AEMs caused a concentration-dependent bradycardia. Droperidol had the lowest margin of safety.
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Grubb S, Vestergaard ML, Andersen AS, Rasmussen KK, Mamsen LS, Tuckute G, Grunnet-Lauridsen K, Møllgård K, Ernst E, Christensen ST, Calloe K, Andersen CY. Comparison of Cultured Human Cardiomyocyte Clusters Obtained from Embryos/Fetuses or Derived from Human Embryonic Stem Cells. Stem Cells Dev 2019; 28:608-619. [PMID: 30755084 DOI: 10.1089/scd.2018.0231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Cardiomyocytes (CMs) derived from human embryonic stem cells (hESCs) or induced pluripotent stem cells (iPSCs) are used to study cardiogenesis and mechanisms of heart disease, and are being used in methods for toxiological screening of drugs. The phenotype of stem-cell-derived CMs should ideally resemble native CMs. Here, we compare embryonic/fetal CMs with hESC-derived CMs according to function and morphology. CM clusters were obtained from human embryonic/fetal hearts from elective terminated pregnancies before gestational week 12, and separated into atrial and ventricular tissues. Specific markers for embryonic CMs and primary cilia were visualized using immunofluorescence microscopy analysis. Contracting human embryonic cardiomyocyte (hECM) clusters morphologically and phenotypically resemble CMs in the embryonic/fetal heart. In addition, the contracting hECM clusters expressed primary cilia similar to that of cells in the embryonic/fetal heart. The electrophysiological characteristics of atrial and ventricular CMs were established by recording action potentials (APs) using sharp electrodes. In contrast to ventricular APs, atrial APs displayed a marked early repolarization followed by a plateau phase. hESC-CMs displayed a continuum of AP shapes. In all embryonic/fetal clusters, both atrial and ventricular, AP duration was prolonged by exposure to the KV11.1 channel inhibitor dofetilide (50 nM); however, the prolongation was not significant, possibly due to the relatively small number of experiments. This study provides novel information on APs and functional characteristics of atrial and ventricular CMs in first trimester hearts, and demonstrates that Kv11.1 channels play a functional role already at these early stages. These results provide information needed to validate methods being developed on the basis of in vitro-derived CMs from either hESC or iPSC, and although there was a good correlation between the morphology of the two types of CMs, differences in electrophysiological characteristics exist.
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Affiliation(s)
- Søren Grubb
- 1 Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Maj Linea Vestergaard
- 2 Laboratory of Reproductive Biology, University Hospital of Copenhagen, Copenhagen, Denmark
| | - Astrid Sten Andersen
- 2 Laboratory of Reproductive Biology, University Hospital of Copenhagen, Copenhagen, Denmark
| | - Karen Koefoed Rasmussen
- 3 Section of Cell and Developmental Biology, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Linn Salto Mamsen
- 2 Laboratory of Reproductive Biology, University Hospital of Copenhagen, Copenhagen, Denmark
| | - Greta Tuckute
- 2 Laboratory of Reproductive Biology, University Hospital of Copenhagen, Copenhagen, Denmark
| | | | - Kjeld Møllgård
- 4 Institute for Cellular and Molecular Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Erik Ernst
- 5 The Department of Gynecology and Obstetrics, University Hospital of Aarhus, Aarhus, Denmark
| | - Søren Tvorup Christensen
- 3 Section of Cell and Developmental Biology, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Kirstine Calloe
- 1 Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Claus Yding Andersen
- 2 Laboratory of Reproductive Biology, University Hospital of Copenhagen, Copenhagen, Denmark
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13
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Associations between use of macrolide antibiotics during pregnancy and adverse child outcomes: A systematic review and meta-analysis. PLoS One 2019; 14:e0212212. [PMID: 30779772 PMCID: PMC6380581 DOI: 10.1371/journal.pone.0212212] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 01/29/2019] [Indexed: 12/03/2022] Open
Abstract
Background Evidence on adverse effects of maternal macrolide use during pregnancy is inconsistent. We conducted a systematic review and meta-analysis to investigate the association between macrolide use during pregnancy and adverse fetal and child outcomes. Methods and findings We included observational studies and randomised controlled trials (RCTs) that recorded macrolide use during pregnancy and child outcomes. We prioritized comparisons of macrolides with alternative antibiotics (mainly penicillins or cephalosporins) for comparability of indication and effect. Random effects meta-analysis was used to derive pooled odds ratios (OR) for each outcome. Subgroup analyses were performed according to specific types (generic forms) of macrolide. Of 11,186 citations identified, 19 (10 observational, 9 RCTs) studies were included (21 articles including 228,556 participants). Macrolide prescribing during pregnancy was associated with an increased risk of miscarriage (pooled ORobs 1·82, 95% CI 1·57–2·11, three studies, I2 = 0%), cerebral palsy and/or epilepsy (ORobs 1·78, 1·18–2·69; one study), epilepsy alone (ORobs 2·02, 1·30–3·14, one study; ORRCT 1.03, 0.79–1.35, two studies), and gastrointestinal malformations (ORobs 1·56, 1·05–2·32, two studies) compared with alternative antibiotics. We found no evidence of an adverse effect on 12 other malformations, stillbirth, or neonatal death. Results were robust to excluding studies with high risk of bias. Conclusions Consistent evidence of an increased risk of miscarriage in observational studies and uncertain risks of cerebral palsy and epilepsy warrant cautious use of macrolide in pregnancy with warnings in drug safety leaflets and use of alternative antibiotics where appropriate. As macrolides are the third most commonly used class of antibiotics, it is important to confirm these results with high quality studies.
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14
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Danielsson B, Webster WS, Ritchie HE. Ondansetron and teratogenicity in rats: Evidence for a mechanism mediated via embryonic hERG blockade. Reprod Toxicol 2018; 81:237-245. [PMID: 30149139 DOI: 10.1016/j.reprotox.2018.08.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Revised: 08/23/2018] [Accepted: 08/23/2018] [Indexed: 01/02/2023]
Abstract
The potent hERG channel blocking drug ondansetron is used off-label for treatment of nausea and vomiting in early pregnancy. Some human epidemiological studies have associated ondansetron with fetal cardiovascular defects and orofacial clefts. This study investigated the effects of ondanestron on embryonic heart rhythm of gestational day (GD) 13 rat embryos in vitro and then integrated the results with published animal teratology, and animal and human pharmacokinetic studies to perform a risk evaluation. Ondansetron caused concentration dependent bradycardia and arrhythmia. Cardiovascular malformations in rats occurred at exposures slightly higher than those in early human pregnancy. Together the results suggest that ondansetron can have teratogenic potential in rats and humans mediated via hERG block and severe heart rhythm disturbances in the embryo. The risk may be increased in human pregnancy if additional risk factors are present such as hypokalemia.
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Affiliation(s)
- B Danielsson
- Swedish National Board of Health and Welfare, Stockholm, Sweden.
| | - William S Webster
- Discipline of Anatomy and Histology, Sydney Medical School, The University of Sydney, Sydney, NSW 2006, Australia.
| | - Helen E Ritchie
- Discipline of Biomedical Sciences, Sydney Medical School, The Unvieristy of Sydney, Sydney, NSW 2006, Australia.
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15
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Fabbri A, Fantini M, Wilders R, Severi S. Computational analysis of the human sinus node action potential: model development and effects of mutations. J Physiol 2017; 595:2365-2396. [PMID: 28185290 PMCID: PMC5374121 DOI: 10.1113/jp273259] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 02/02/2017] [Indexed: 12/12/2022] Open
Abstract
KEY POINTS We constructed a comprehensive mathematical model of the spontaneous electrical activity of a human sinoatrial node (SAN) pacemaker cell, starting from the recent Severi-DiFrancesco model of rabbit SAN cells. Our model is based on electrophysiological data from isolated human SAN pacemaker cells and closely matches the action potentials and calcium transient that were recorded experimentally. Simulated ion channelopathies explain the clinically observed changes in heart rate in corresponding mutation carriers, providing an independent qualitative validation of the model. The model shows that the modulatory role of the 'funny current' (If ) in the pacing rate of human SAN pacemaker cells is highly similar to that of rabbit SAN cells, despite its considerably lower amplitude. The model may prove useful in the design of experiments and the development of heart-rate modulating drugs. ABSTRACT The sinoatrial node (SAN) is the normal pacemaker of the mammalian heart. Over several decades, a large amount of data on the ionic mechanisms underlying the spontaneous electrical activity of SAN pacemaker cells has been obtained, mostly in experiments on single cells isolated from rabbit SAN. This wealth of data has allowed the development of mathematical models of the electrical activity of rabbit SAN pacemaker cells. The present study aimed to construct a comprehensive model of the electrical activity of a human SAN pacemaker cell using recently obtained electrophysiological data from human SAN pacemaker cells. We based our model on the recent Severi-DiFrancesco model of a rabbit SAN pacemaker cell. The action potential and calcium transient of the resulting model are close to the experimentally recorded values. The model has a much smaller 'funny current' (If ) than do rabbit cells, although its modulatory role is highly similar. Changes in pacing rate upon the implementation of mutations associated with sinus node dysfunction agree with the clinical observations. This agreement holds for both loss-of-function and gain-of-function mutations in the HCN4, SCN5A and KCNQ1 genes, underlying ion channelopathies in If , fast sodium current and slow delayed rectifier potassium current, respectively. We conclude that our human SAN cell model can be a useful tool in the design of experiments and the development of drugs that aim to modulate heart rate.
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Affiliation(s)
- Alan Fabbri
- Computational Physiopathology Unit, Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”University of BolognaCesenaItaly
| | - Matteo Fantini
- Computational Physiopathology Unit, Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”University of BolognaCesenaItaly
| | - Ronald Wilders
- Department of Anatomy, Embryology and Physiology, Academic Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands
| | - Stefano Severi
- Computational Physiopathology Unit, Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”University of BolognaCesenaItaly
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16
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Fermini B, Ramirez DS, Sun S, Bassyouni A, Hemkens M, Wisialowski T, Jenkinson S. L-type calcium channel antagonism – Translation from in vitro to in vivo. J Pharmacol Toxicol Methods 2017; 84:86-92. [DOI: 10.1016/j.vascn.2016.11.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 11/10/2016] [Accepted: 11/13/2016] [Indexed: 01/09/2023]
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17
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Liu J, Laksman Z, Backx PH. The electrophysiological development of cardiomyocytes. Adv Drug Deliv Rev 2016; 96:253-73. [PMID: 26788696 DOI: 10.1016/j.addr.2015.12.023] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 12/23/2015] [Accepted: 12/31/2015] [Indexed: 02/07/2023]
Abstract
The generation of human cardiomyocytes (CMs) from human pluripotent stem cells (hPSCs) has become an important resource for modeling human cardiac disease and for drug screening, and also holds significant potential for cardiac regeneration. Many challenges remain to be overcome however, before innovation in this field can translate into a change in the morbidity and mortality associated with heart disease. Of particular importance for the future application of this technology is an improved understanding of the electrophysiologic characteristics of CMs, so that better protocols can be developed and optimized for generating hPSC-CMs. Many different cell culture protocols are currently utilized to generate CMs from hPSCs and all appear to yield relatively “developmentally” immature CMs with highly heterogeneous electrical properties. These hPSC-CMs are characterized by spontaneous beating at highly variable rates with a broad range of depolarization-repolarization patterns, suggestive of mixed populations containing atrial, ventricular and nodal cells. Many recent studies have attempted to introduce approaches to promote maturation and to create cells with specific functional properties. In this review, we summarize the studies in which the electrical properties of CMs derived from stem cells have been examined. In order to place this information in a useful context, we also review the electrical properties of CMs as they transition from the developing embryo to the adult human heart. The signal pathways involved in the regulation of ion channel expression during development are also briefly considered.
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18
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Maturing human pluripotent stem cell-derived cardiomyocytes in human engineered cardiac tissues. Adv Drug Deliv Rev 2016; 96:110-34. [PMID: 25956564 DOI: 10.1016/j.addr.2015.04.019] [Citation(s) in RCA: 158] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 04/24/2015] [Accepted: 04/25/2015] [Indexed: 12/19/2022]
Abstract
Engineering functional human cardiac tissue that mimics the native adult morphological and functional phenotype has been a long held objective. In the last 5 years, the field of cardiac tissue engineering has transitioned from cardiac tissues derived from various animal species to the production of the first generation of human engineered cardiac tissues (hECTs), due to recent advances in human stem cell biology. Despite this progress, the hECTs generated to date remain immature relative to the native adult myocardium. In this review, we focus on the maturation challenge in the context of hECTs, the present state of the art, and future perspectives in terms of regenerative medicine, drug discovery, preclinical safety testing and pathophysiological studies.
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19
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Abstract
The risk of arrhythmia development or recurrence is increased during pregnancy. For those arrhythmias that are unresponsive to conservative therapy, such as vagal maneuvers or life style interventions, or that present a higher risk to the mother or fetus, medical therapy may be necessary. In each case, the patient and provider must carefully consider the risks and benefits of a particular therapy. This requires an understanding of the data regarding the safety and efficacy of any particular drug, which in some cases may be extensive and in others quite limited. Fortunately, options exist for the treatment of arrhythmias during pregnancy.
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Affiliation(s)
- Jennifer M Wright
- a Cardiovascular Division, Department of Medicine , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
| | - Richard L Page
- a Cardiovascular Division, Department of Medicine , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
| | - Michael E Field
- a Cardiovascular Division, Department of Medicine , University of Wisconsin School of Medicine and Public Health , Madison , WI , USA
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20
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21
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Ritchie H, Oakes D, Hung TT, Hegedus E, Sood S, Webster W. The Effect of Dofetilide on the Heart Rate of GD11 and GD13 Rat Embryos, in vivo, Using Ultrasound. ACTA ACUST UNITED AC 2015; 104:196-203. [DOI: 10.1002/bdrb.21162] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 08/28/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Helen Ritchie
- Discipline of Biomedical Science; University of Sydney; New South Wales Australia
| | - Diana Oakes
- Discipline of Biomedical Science; University of Sydney; New South Wales Australia
| | - Tzong-tyng Hung
- Biological Resources Imaging Laboratory; University of New South Wales; New South Wales Australia
| | - Elizabeth Hegedus
- Discipline of Biomedical Science; University of Sydney; New South Wales Australia
| | - Shreya Sood
- Discipline of Biomedical Science; University of Sydney; New South Wales Australia
| | - William Webster
- Department of Anatomy and Histology; The University of Sydney; New South Wales Australia
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22
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Polyunsaturated fatty acid analogs act antiarrhythmically on the cardiac IKs channel. Proc Natl Acad Sci U S A 2015; 112:5714-9. [PMID: 25901329 DOI: 10.1073/pnas.1503488112] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Polyunsaturated fatty acids (PUFAs) affect cardiac excitability. Kv7.1 and the β-subunit KCNE1 form the cardiac IKs channel that is central for cardiac repolarization. In this study, we explore the prospects of PUFAs as IKs channel modulators. We report that PUFAs open Kv7.1 via an electrostatic mechanism. Both the polyunsaturated acyl tail and the negatively charged carboxyl head group are required for PUFAs to open Kv7.1. We further show that KCNE1 coexpression abolishes the PUFA effect on Kv7.1 by promoting PUFA protonation. PUFA analogs with a decreased pKa value, to preserve their negative charge at neutral pH, restore the sensitivity to open IKs channels. PUFA analogs with a positively charged head group inhibit IKs channels. These different PUFA analogs could be developed into drugs to treat cardiac arrhythmias. In support of this possibility, we show that PUFA analogs act antiarrhythmically in embryonic rat cardiomyocytes and in isolated perfused hearts from guinea pig.
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23
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Danielsson B, Wikner BN, Källén B. Use of ondansetron during pregnancy and congenital malformations in the infant. Reprod Toxicol 2014; 50:134-7. [DOI: 10.1016/j.reprotox.2014.10.017] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 10/17/2014] [Accepted: 10/20/2014] [Indexed: 10/24/2022]
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24
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Antiobesity drugs in early pregnancy and congenital malformations in the offspring. Obes Res Clin Pract 2014; 8:e571-6. [DOI: 10.1016/j.orcp.2013.11.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 11/30/2013] [Indexed: 11/21/2022]
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25
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Ritchie HE, Svensson CH, Nilsson MF, Webster WS. A comparison of drug-induced cardiotoxicity in rat embryos cultured in human serum or protein free media. J Pharmacol Toxicol Methods 2014; 70:276-82. [DOI: 10.1016/j.vascn.2014.07.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 07/07/2014] [Accepted: 07/23/2014] [Indexed: 10/25/2022]
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26
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Fetal safety of erythromycin. An update of Swedish data. Eur J Clin Pharmacol 2013; 70:355-60. [DOI: 10.1007/s00228-013-1624-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 12/02/2013] [Indexed: 11/25/2022]
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27
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Nilsson MF, Ritchie H, Webster WS. The effect on rat embryonic heart rate of Na+, K+, and Ca2+ channel blockers, and the human teratogen phenytoin, changes with gestational age. ACTA ACUST UNITED AC 2013; 98:416-27. [PMID: 24323366 DOI: 10.1002/bdrb.21084] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 10/28/2013] [Accepted: 10/28/2013] [Indexed: 11/09/2022]
Abstract
In this study, we compared the effects of four ion channel blockers on rat embryonic heart function during the organogenic period from gestational day (GD) 10 to 15, to determine the changes in dependence on ion channels during rat cardiac development. Rat embryos in culture were exposed to either the human ether-á-go-go-related gene potassium channel blocker, dofetilide (400 nM); the sodium channel blocker, lidocaine (250 μM); the L-type calcium channel blocker, nifedipine (1.8 μM); or the multichannel blocker, phenytoin (200 μM). Lidocaine slowed the heart rate (HR) with the effect becoming more severe with increasing GD. Dofetilide slowed the embryonic HR and caused arrhythmias with the most severe effect on GD 11 to 13. Nifedipine primarily caused a negative inotropic effect except on GD 10 when it stopped the heart in most embryos. Phenytoin stopped the heart of most GD 10 to 12 embryos while on GD 13 to 15 phenytoin slowed the heart. The results demonstrate that as the rat heart develops during the organogenic period its functional dependence on ion channels changes markedly. These changes are important for understanding drug effects on the embryo during pregnancy and the methodology used provides a simple procedure for assessing drug effects on the developing heart.
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Affiliation(s)
- Mats F Nilsson
- Drug Safety and Toxicology, Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
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28
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Ritchie HE, Ababneh DH, Oakes DJ, Power CA, Webster WS. The teratogenic effect of dofetilide during rat limb development and association with drug-induced bradycardia and hypoxia in the embryo. ACTA ACUST UNITED AC 2013; 98:144-53. [PMID: 23504928 DOI: 10.1002/bdrb.21050] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Accepted: 12/19/2012] [Indexed: 12/16/2022]
Abstract
BACKGROUND Dofetilide is an antiarrhythmic drug that blocks the cardiac repolarizing current IKr ((IKr, rapid component of the delayed rectifying potassium current). Previous studies have shown that (a) IKr is essential for normal cardiac function of the embryonic heart and (b) dofetilide is teratogenic in rodents. This study was undertaken to examine the mechanism by which dofetilide causes limb defects on gestational day 13 (GD 13) in the rat. METHODS Rats were treated with dofetilide (single oral dose, 5 mg/kg) on GD 13 and embryonic heart rates assessed by ultrasound (Vevo770, VisualSonics, Toronto, Ontario, Canada) 2 hr later. Fetuses were examined for malformations on GD 20. In a separate experiment, dofetilide treatment of GD 13 rats was followed 2, 4, 12, or 24 hr with iv dosing with the hypoxia marker, pimonidazole (60 mg/kg). Embryos were collected and heart rates were assessed in vitro and hypoxia in embryo limbs analyzed. RESULTS A teratogenic dose of dofetilide at a susceptible stage of development (GD 13) resulted in a period of bradycardia and arrhythmia of the embryonic heart and hypoxia in the developing limbs (GD 13) resulting in limb malformations (GD 20). CONCLUSIONS Drugs that induce periods of bradycardia and/or arrhythmia of the embryonic heart and cause the embryo to become hypoxic are potential human teratogens.
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Affiliation(s)
- Helen E Ritchie
- Discipline of Biomedical Science, Sydney Medical School, University of Sydney, Sydney, Australia
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29
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Franco D. Wiring the developing heart: a serious matter for adulthood. Cardiovasc Res 2013; 97:4-5. [PMID: 23175775 DOI: 10.1093/cvr/cvs341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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