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Norup Hertel J, Linz B, Isaksen J, Jerltorp K, Leonhardt C, Gottlieb L, Saljic A, Jespersen T, Linz D. Inhibition of the acetylcholine-regulated potassium current prevents transient apnea-related atrial arrhythmogenic changes in a porcine model. Heart Rhythm 2024; 21:622-629. [PMID: 38280622 DOI: 10.1016/j.hrthm.2024.01.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 01/17/2024] [Accepted: 01/19/2024] [Indexed: 01/29/2024]
Abstract
BACKGROUND More than 50% of patients with atrial fibrillation (AF) suffer from sleep disordered breathing (SDB). Obstructive respiratory events contribute to a transient, vagally mediated atrial arrhythmogenic substrate, which is resistant to most available antiarrhythmic drugs. OBJECTIVE The purpose of this study was to investigate the effect of pharmacologic inhibition of the G-protein-gated acetylcholine-regulated potassium current (IK,ACh) with and without acute autonomic nervous system activation by nicotine in a pig model for obstructive respiratory events. METHODS In 21 pigs, SDB was simulated by applying an intermittent negative upper airway pressure (INAP). AF inducibility and atrial effective refractory periods (aERPs) were determined before and during INAP by an S1S2 atrial pacing-protocol. Pigs were randomized into 3 groups-group 1: vehicle (n = 4); group 2: XAF-1407 (IK,ACh inhibitor) (n = 7); and group 3: nicotine followed by XAF-1407 (n = 10). RESULTS In group 1, INAP shortened aERP (ΔaERP -42.6 ms; P = .004) and transiently increased AF inducibility from 0% to 31%. In group 2, XAF-1407 prolonged aERP by 25.2 ms (P = .005) during normal breathing and prevented INAP-induced aERP shortening (ΔaERP -3.6 ms; P = .3) and AF inducibility. In group 3, INAP transiently shortened aERP during nicotine perfusion (ΔaERP -33.6 ms; P = .004) and increased AF inducibility up to 61%, which both were prevented by XAF-1407. CONCLUSION Simulated obstructive respiratory events transiently shorten aERP and increase AF inducibility, which can be prevented by the IK,ACh-inhibitor XAF-1407. XAF-1407 also prevents these arrhythmogenic changes induced by obstructive respiratory events during nicotine perfusion. Whether IK,ACh channels represent a target for SDB-related AF in humans warrants further study.
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Affiliation(s)
- Julie Norup Hertel
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Benedikt Linz
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jonas Isaksen
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Kezia Jerltorp
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Caroline Leonhardt
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lisa Gottlieb
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Arnela Saljic
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Jespersen
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Dominik Linz
- Faculty of Health and Medical Sciences, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark; Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute, Royal Adelaide Hospital, University of Adelaide, Australia; Department of Cardiology, Maastricht University Medical Centre and Cardiovascular Research Institute Maastricht, Maastricht, The Netherlands.
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Ohlrogge AH, Frost L, Schnabel RB. Harmful Impact of Tobacco Smoking and Alcohol Consumption on the Atrial Myocardium. Cells 2022; 11:2576. [PMID: 36010652 PMCID: PMC9406618 DOI: 10.3390/cells11162576] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/05/2022] [Accepted: 08/11/2022] [Indexed: 11/23/2022] Open
Abstract
Tobacco smoking and alcohol consumption are widespread exposures that are legal and socially accepted in many societies. Both have been widely recognized as important risk factors for diseases in all vital organ systems including cardiovascular diseases, and with clinical manifestations that are associated with atrial dysfunction, so-called atrial cardiomyopathy, especially atrial fibrillation and stroke. The pathogenesis of atrial cardiomyopathy, atrial fibrillation, and stroke in context with smoking and alcohol consumption is complex and multifactorial, involving pathophysiological mechanisms, environmental, and societal aspects. This narrative review summarizes the current literature regarding alterations in the atrial myocardium that is associated with smoking and alcohol.
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Affiliation(s)
- Amelie H. Ohlrogge
- Department of Cardiology, University Heart and Vascular Centre Hamburg, 20246 Hamburg, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, 20246 Hamburg, Germany
| | - Lars Frost
- Diagnostic Centre, University Clinic for Development of Innovative Patient Pathways, Silkeborg Regional Hospital, 8600 Silkeborg, Denmark
- Department of Clinical Medicine, Aarhus University, 8200 Aarhus, Denmark
| | - Renate B. Schnabel
- Department of Cardiology, University Heart and Vascular Centre Hamburg, 20246 Hamburg, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, 20246 Hamburg, Germany
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Klimovic S, Scurek M, Pesl M, Beckerova D, Jelinkova S, Urban T, Kabanov D, Starek Z, Bebarova M, Pribyl J, Rotrekl V, Brat K. Aminophylline Induces Two Types of Arrhythmic Events in Human Pluripotent Stem Cell-Derived Cardiomyocytes. Front Pharmacol 2022; 12:789730. [PMID: 35111056 PMCID: PMC8802108 DOI: 10.3389/fphar.2021.789730] [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: 10/05/2021] [Accepted: 11/17/2021] [Indexed: 11/13/2022] Open
Abstract
Cardiac side effects of some pulmonary drugs are observed in clinical practice. Aminophylline, a methylxanthine bronchodilator with documented proarrhythmic action, may serve as an example. Data on the action of aminophylline on cardiac cell electrophysiology and contractility are not available. Hence, this study was focused on the analysis of changes in the beat rate and contraction force of human pluripotent stem cell-derived cardiomyocytes (hPSC-CMs) and HL-1 cardiomyocytes in the presence of increasing concentrations of aminophylline (10 µM-10 mM in hPSC-CM and 8-512 µM in HL-1 cardiomyocytes). Basic biomedical parameters, namely, the beat rate (BR) and contraction force, were assessed in hPSC-CMs using an atomic force microscope (AFM). The beat rate changes under aminophylline were also examined on the HL-1 cardiac muscle cell line via a multielectrode array (MEA). Additionally, calcium imaging was used to evaluate the effect of aminophylline on intracellular Ca2+ dynamics in HL-1 cardiomyocytes. The BR was significantly increased after the application of aminophylline both in hPSC-CMs (with 10 mM aminophylline) and in HL-1 cardiomyocytes (with 256 and 512 µM aminophylline) in comparison with controls. A significant increase in the contraction force was also observed in hPSC-CMs with 10 µM aminophylline (a similar trend was visible at higher concentrations as well). We demonstrated that all aminophylline concentrations significantly increased the frequency of rhythm irregularities (extreme interbeat intervals) both in hPSC-CMs and HL-1 cells. The occurrence of the calcium sparks in HL-1 cardiomyocytes was significantly increased with the presence of 512 µM aminophylline. We conclude that the observed aberrant cardiomyocyte response to aminophylline suggests an arrhythmogenic potential of the drug. The acquired data represent a missing link between the arrhythmic events related to the aminophylline/theophylline treatment in clinical practice and describe cellular mechanisms of methylxanthine arrhythmogenesis. An AFM combined with hPSC-CMs may serve as a robust platform for direct drug effect screening.
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Affiliation(s)
- Simon Klimovic
- CEITEC, Masaryk University, Brno, Czechia
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
- Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czechia
| | - Martin Scurek
- Department of Respiratory Diseases, University Hospital Brno, Brno, Czechia
- Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Martin Pesl
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
- International Clinical Research Center, St. Anne’s University Hospital, Brno, Czechia
- First Department of Internal Medicine—Cardioangiology, Faculty of Medicine, St. Anne’s University Hospital, Masaryk University, Brno, Czechia
| | - Deborah Beckerova
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
- International Clinical Research Center, St. Anne’s University Hospital, Brno, Czechia
| | - Sarka Jelinkova
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Tomas Urban
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
- First Department of Internal Medicine—Cardioangiology, Faculty of Medicine, St. Anne’s University Hospital, Masaryk University, Brno, Czechia
| | - Daniil Kabanov
- CEITEC, Masaryk University, Brno, Czechia
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
- Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czechia
| | - Zdenek Starek
- International Clinical Research Center, St. Anne’s University Hospital, Brno, Czechia
- First Department of Internal Medicine—Cardioangiology, Faculty of Medicine, St. Anne’s University Hospital, Masaryk University, Brno, Czechia
| | - Marketa Bebarova
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Jan Pribyl
- CEITEC, Masaryk University, Brno, Czechia
| | - Vladimir Rotrekl
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia
- International Clinical Research Center, St. Anne’s University Hospital, Brno, Czechia
| | - Kristian Brat
- Department of Respiratory Diseases, University Hospital Brno, Brno, Czechia
- Faculty of Medicine, Masaryk University, Brno, Czechia
- International Clinical Research Center, St. Anne’s University Hospital, Brno, Czechia
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Kula R, Bébarová M, Matejovič P, Šimurda J, Pásek M. Current density as routine parameter for description of ionic membrane current: is it always the best option? PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 157:24-32. [DOI: 10.1016/j.pbiomolbio.2019.11.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 09/20/2019] [Accepted: 11/26/2019] [Indexed: 12/17/2022]
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Eun Y, Han KD, Kim DH, Kim IY, Park EJ, Lee S, Cha HS, Koh EM, Lee J, Kim H. Increased Overall Heart Rate Irregularity Risk by Hyperuricemia in the General Population: Results from the Korean National Health and Nutrition Examination Survey. ACTA ACUST UNITED AC 2020; 56:medicina56100501. [PMID: 32987834 PMCID: PMC7600340 DOI: 10.3390/medicina56100501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/17/2020] [Accepted: 09/21/2020] [Indexed: 12/28/2022]
Abstract
Background and objectives: Hyperuricemia is one of the well-known cardiovascular risk factors. There is a growing interest in the association between hyperuricemia and arrhythmia. We used the representative sample data of Korean population to study the association between hyperuricemia and heart rate irregularity (HRI) that reflects total arrhythmia. Materials and Methods: We performed weighted multivariate logistic regression analysis to assess the association between hyperuricemia and HRI. Results: Of the 10,827 subjects, 1308 (13.2%) had hyperuricemia and 130 (1%) had HRI. In the presence of hyperuricemia, HRI was three times higher than that in the absence of hyperuricemia (OR 2.98, 95% CI 1.71–5.18). The risk of HRI was highest in subjects with both hypertension and hyperuricemia. In the subgroup analysis, the association of hyperuricemia with HRI was most pronounced in the smoker group. Conclusions: Hyperuricemia was highly correlated with HRI in adult Korean representative sample data. Hyperuricemia was associated with a nearly tripled risk for HRI. Hypertension has a synergistic effect with hyperuricemia on HRI. Further research is warranted to clarify the relationship between hyperuricemia and arrhythmia and its mechanism.
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Affiliation(s)
- Yeonghee Eun
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea; (Y.E.); (S.L.); (H.-S.C.); (E.-M.K.)
| | - Kyung-Do Han
- Department of Statistics and Actuarial Science, Soongsil University, Seoul 06978, Korea; (K.-D.H.); (D.H.K.)
| | - Da Hye Kim
- Department of Statistics and Actuarial Science, Soongsil University, Seoul 06978, Korea; (K.-D.H.); (D.H.K.)
| | - In Young Kim
- Department of Medicine, National Police Hospital, Seoul 05715, Korea;
| | - Eun-Jung Park
- Department of Medicine, National Medical Center, Seoul 04564, Korea;
| | - Seulkee Lee
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea; (Y.E.); (S.L.); (H.-S.C.); (E.-M.K.)
| | - Hoon-Suk Cha
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea; (Y.E.); (S.L.); (H.-S.C.); (E.-M.K.)
| | - Eun-Mi Koh
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea; (Y.E.); (S.L.); (H.-S.C.); (E.-M.K.)
| | - Jaejoon Lee
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea; (Y.E.); (S.L.); (H.-S.C.); (E.-M.K.)
- Correspondence: (J.L.); (H.K.)
| | - Hyungjin Kim
- Department of Medical Humanities, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea
- Correspondence: (J.L.); (H.K.)
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Kula R, Bébarová M, Matejovič P, Šimurda J, Pásek M. Distribution of data in cellular electrophysiology: Is it always normal? PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 157:11-17. [PMID: 32621819 DOI: 10.1016/j.pbiomolbio.2020.05.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 05/11/2020] [Accepted: 05/14/2020] [Indexed: 12/16/2022]
Abstract
The distribution of data presented in many electrophysiological studies is presumed to be normal without any convincing evidence. To test this presumption, the cell membrane capacitance and magnitude of inward rectifier potassium currents were recorded by the whole-cell patch clamp technique in rat atrial myocytes. Statistical analysis of the data showed that these variables were not distributed normally. Instead, a positively skewed distribution appeared to be a better approximation of the real data distribution. Consequently, the arithmetic mean, used inappropriately in such data, may substantially overestimate the true mean value characterizing the central tendency of the data. Moreover, a large standard deviation describing the variance of positively skewed data allowed 95% confidence interval to include unrealistic negative values. We therefore conclude that the normality of the electrophysiological data should be tested in every experiment and, if rejected, the positively skewed data should be more accurately characterized by the median and interpercentile range or, if justified (namely in the case of log-normal and gamma data distribution), by the geometric mean and the geometric standard deviation.
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Affiliation(s)
- Roman Kula
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Markéta Bébarová
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Peter Matejovič
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Jiří Šimurda
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Michal Pásek
- Department of Physiology, Faculty of Medicine, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic; Institute of Thermomechanics, Czech Academy of Sciences, Dolejškova 5, 182 00, Prague, Czech Republic.
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Šimurda J, Šimurdová M, Švecová O. A new simple approach to estimation of membrane capacitance from current responses to voltage clamp steps. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 157:18-23. [PMID: 32428518 DOI: 10.1016/j.pbiomolbio.2020.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 03/13/2020] [Accepted: 04/25/2020] [Indexed: 11/28/2022]
Abstract
A variety of techniques of cell capacitance measurement have been proposed and applied in cellular electrophysiology. They are mostly based on the evaluation of membrane current responses to small changes in the membrane voltage. One of the currently used approaches applies the least-squares fit of an exponential current decay in response to voltage clamped rectangular pulses. In this study, we propose an alternative simpler approach to evaluation of the exponential parts in the current responses to square wave stimulation and present preliminary results of membrane capacitance evaluation. It is based on the property of the exponential function that has not yet been used to measure membrane capacitance. The time constant and the asymptote of the exponential waveform are unambiguously determined by the values read at three points separated by a constant time interval. In order to minimize the effect of noise and deviations from the exponential waveform, the triplet of points is designed to slide along the time axis. The results of the proposed approach and those previously evaluated by the least squares method are comparable. The method described may be advantageous for continuously recording changes in membrane capacitance.
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Affiliation(s)
- Jiří Šimurda
- Department of Physiology, Medical Faculty, Masaryk University Brno, Czech Republic.
| | - Milena Šimurdová
- Department of Physiology, Medical Faculty, Masaryk University Brno, Czech Republic
| | - Olga Švecová
- Department of Physiology, Medical Faculty, Masaryk University Brno, Czech Republic
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The intriguing effect of ethanol and nicotine on acetylcholine-sensitive potassium current IKAch: Insight from a quantitative model. PLoS One 2019; 14:e0223448. [PMID: 31600261 PMCID: PMC6786802 DOI: 10.1371/journal.pone.0223448] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 09/20/2019] [Indexed: 02/01/2023] Open
Abstract
Recent experimental work has revealed unusual features of the effect of certain drugs on cardiac inwardly rectifying potassium currents, including the constitutively active and acetylcholine-induced components of acetylcholine-sensitive current (IKAch). These unusual features have included alternating susceptibility of the current components to activation and inhibition induced by ethanol or nicotine applied at various concentrations, and significant correlation between the drug effect and the current magnitude measured under drug-free conditions. To explain these complex drug effects, we have developed a new type of quantitative model to offer a possible interpretation of the effect of ethanol and nicotine on the IKAch channels. The model is based on a description of IKAch as a sum of particular currents related to the populations of channels formed by identical assemblies of different α-subunits. Assuming two different channel populations in agreement with the two reported functional IKAch-channels (GIRK1/4 and GIRK4), the model was able to simulate all the above-mentioned characteristic features of drug-channel interactions and also the dispersion of the current measured in different cells. The formulation of our model equations allows the model to be incorporated easily into the existing integrative models of electrical activity of cardiac cells involving quantitative description of IKAch. We suppose that the model could also help make sense of certain observations related to the channels that do not show inward rectification. This new ionic channel model, based on a concept we call population type, may allow for the interpretation of complex interactions of drugs with ionic channels of various types, which cannot be done using the ionic channel models available so far.
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