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Arel E, Rolland L, Thireau J, Torrente AG, Bechard E, Bride J, Jopling C, Demion M, Le Guennec JY. The Effect of Hypothermia and Osmotic Shock on the Electrocardiogram of Adult Zebrafish. BIOLOGY 2022; 11:biology11040603. [PMID: 35453802 PMCID: PMC9025276 DOI: 10.3390/biology11040603] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 04/08/2022] [Accepted: 04/13/2022] [Indexed: 11/16/2022]
Abstract
Simple Summary Assessing cardiac toxicity of new drugs is a requirement for their approval. One of the parameters which is carefully looked at is the QT interval, which is determined using an electrocardiogram (ECG). Before undertaking clinical trials using human patients, it is important to first perform pre-clinical tests using animal models. Zebrafish are widely used to study cardiac physiology and several reports suggest that although ECG measurement can be performed, the recording configuration appears to affect the results. Our research aimed to provide a comprehensive characterization of adult zebrafish ECG to determine the best practice for using this model during cardiac toxicity trials. We tested three recording configurations and determined that exposing the heart provided the most reliable and reproducible ECG recordings. We also determined the most accurate correction to apply to calculate the corrected QT, which makes the QT interval independent of the heart rate, a critical parameter when assessing drug cardiac toxicity. Overall, our study highlights the best conditions to record zebrafish ECG and demonstrates their utility for cardiac toxicity testing. Abstract The use of zebrafish to explore cardiac physiology has been widely adopted within the scientific community. Whether this animal model can be used to determine drug cardiac toxicity via electrocardiogram (ECG) analysis is still an ongoing question. Several reports indicate that the recording configuration severely affects the ECG waveforms and its derived-parameters, emphasizing the need for improved characterization. To address this problem, we recorded ECGs from adult zebrafish hearts in three different configurations (unexposed heart, exposed heart, and extracted heart) to identify the most reliable method to explore ECG recordings at baseline and in response to commonly used clinical therapies. We found that the exposed heart configuration provided the most reliable and reproducible ECG recordings of waveforms and intervals. We were unable to determine T wave morphology in unexposed hearts. In extracted hearts, ECG intervals were lengthened and P waves were unstable. However, in the exposed heart configuration, we were able to reliably record ECGs and subsequently establish the QT-RR relationship (Holzgrefe correction) in response to changes in heart rate.
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Affiliation(s)
- Elodie Arel
- PhyMedExp, Université de Montpellier, Inserm U1046, UMR CNRS 9412, 34090 Montpellier, France; (E.A.); (J.T.); (E.B.); (J.B.); (M.D.); (J.-Y.L.G.)
- Institut de génomique fonctionnelle (IGF), Université de Montpellier, Inserm U1191, UMR CNRS 5203, 34094 Montpellier, France; (L.R.); (A.G.T.)
| | - Laura Rolland
- Institut de génomique fonctionnelle (IGF), Université de Montpellier, Inserm U1191, UMR CNRS 5203, 34094 Montpellier, France; (L.R.); (A.G.T.)
| | - Jérôme Thireau
- PhyMedExp, Université de Montpellier, Inserm U1046, UMR CNRS 9412, 34090 Montpellier, France; (E.A.); (J.T.); (E.B.); (J.B.); (M.D.); (J.-Y.L.G.)
| | - Angelo Giovanni Torrente
- Institut de génomique fonctionnelle (IGF), Université de Montpellier, Inserm U1191, UMR CNRS 5203, 34094 Montpellier, France; (L.R.); (A.G.T.)
| | - Emilie Bechard
- PhyMedExp, Université de Montpellier, Inserm U1046, UMR CNRS 9412, 34090 Montpellier, France; (E.A.); (J.T.); (E.B.); (J.B.); (M.D.); (J.-Y.L.G.)
| | - Jamie Bride
- PhyMedExp, Université de Montpellier, Inserm U1046, UMR CNRS 9412, 34090 Montpellier, France; (E.A.); (J.T.); (E.B.); (J.B.); (M.D.); (J.-Y.L.G.)
- Institut de génomique fonctionnelle (IGF), Université de Montpellier, Inserm U1191, UMR CNRS 5203, 34094 Montpellier, France; (L.R.); (A.G.T.)
| | - Chris Jopling
- Institut de génomique fonctionnelle (IGF), Université de Montpellier, Inserm U1191, UMR CNRS 5203, 34094 Montpellier, France; (L.R.); (A.G.T.)
- Correspondence:
| | - Marie Demion
- PhyMedExp, Université de Montpellier, Inserm U1046, UMR CNRS 9412, 34090 Montpellier, France; (E.A.); (J.T.); (E.B.); (J.B.); (M.D.); (J.-Y.L.G.)
| | - Jean-Yves Le Guennec
- PhyMedExp, Université de Montpellier, Inserm U1046, UMR CNRS 9412, 34090 Montpellier, France; (E.A.); (J.T.); (E.B.); (J.B.); (M.D.); (J.-Y.L.G.)
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Le T, Zhang J, Nguyen AH, Trigo Torres RS, Vo K, Dutt N, Lee J, Ding Y, Xu X, Lau MPH, Cao H. A novel wireless ECG system for prolonged monitoring of multiple zebrafish for heart disease and drug screening studies. Biosens Bioelectron 2022; 197:113808. [PMID: 34801796 DOI: 10.1016/j.bios.2021.113808] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/05/2021] [Accepted: 11/13/2021] [Indexed: 12/19/2022]
Abstract
Zebrafish and their mutant lines have been extensively used in cardiovascular studies. In the current study, the novel system, Zebra II, is presented for prolonged electrocardiogram (ECG) acquisition and analysis for multiple zebrafish within controllable working environments. The Zebra II is composed of a perfusion system, apparatuses, sensors, and an in-house electronic system. First, the Zebra II is validated in comparison with a benchmark system, namely iWORX, through various experiments. The validation displayed comparable results in terms of data quality and ECG changes in response to drug treatment. The effects of anesthetic drugs and temperature variation on zebrafish ECG were subsequently investigated in experiments that need real-time data assessment. The Zebra II's capability of continuous anesthetic administration enabled prolonged ECG acquisition up to 1 h compared to that of 5 min in existing systems. The novel, cloud-based, automated analysis with data obtained from four fish further provided a useful solution for combinatorial experiments and helped save significant time and effort. The system showed robust ECG acquisition and analytics for various applications including arrhythmia in sodium induced sinus arrest, temperature-induced heart rate variation, and drug-induced arrhythmia in Tg(SCN5A-D1275N) mutant and wildtype fish. The multiple channel acquisition also enabled the implementation of randomized controlled trials on zebrafish models. The developed ECG system holds promise and solves current drawbacks in order to greatly accelerate drug screening applications and other cardiovascular studies using zebrafish.
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Affiliation(s)
- Tai Le
- Department of Electrical Engineering and Computer Science, UC Irvine, Irvine, CA, 92697, USA
| | - Jimmy Zhang
- Department of Biomedical Engineering, UC Irvine, Irvine, CA, 92697, USA
| | - Anh H Nguyen
- Department of Electrical Engineering and Computer Science, UC Irvine, Irvine, CA, 92697, USA; Sensoriis., Inc, Edmonds, WA, 98026, USA
| | | | - Khuong Vo
- Donald Bren School of Information and Computer Sciences, UC Irvine, CA 92697, USA
| | - Nikil Dutt
- Donald Bren School of Information and Computer Sciences, UC Irvine, CA 92697, USA
| | - Juhyun Lee
- Department of Bioengineering, University of Texas, Arlington, TX, 76019, USA
| | - Yonghe Ding
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Xiaolei Xu
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55905, USA
| | | | - Hung Cao
- Department of Electrical Engineering and Computer Science, UC Irvine, Irvine, CA, 92697, USA; Department of Biomedical Engineering, UC Irvine, Irvine, CA, 92697, USA; Sensoriis., Inc, Edmonds, WA, 98026, USA.
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Ling D, Chen H, Chan G, Lee SMY. Quantitative measurements of zebrafish heartrate and heart rate variability: A survey between 1990-2020. Comput Biol Med 2021; 142:105045. [PMID: 34995954 DOI: 10.1016/j.compbiomed.2021.105045] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/14/2021] [Accepted: 11/14/2021] [Indexed: 12/19/2022]
Abstract
Zebrafish is an essential model organism for studying cardiovascular diseases, given its advantages of fast proliferation and high gene homology with humans. Zebrafish embryos/larvae are valuable experimental models used in toxicology studies to analyze drug toxicity, including hepatoxicity, nephrotoxicity and cardiotoxicity, as well as for drug discovery and drug safety screening in the preclinical stage. Heart rate (HR) serves as a functional endpoint in studies of cardiotoxicity, while heart rate variability (HRV) serves as an indicator of cardiac arrhythmia. Cardiotoxicity is a major cause of early and late termination of drug trials, so a more comprehensive understanding of zebrafish HR and HRV is important. This review summarized HR and HRV in a specific range of applications and fields, focusing on zebrafish heartbeat detection procedures, signal analysis technology and well-established commercial software, such as LabVIEW, Rvlpulse, and ZebraLab. We also compared HR detection algorithms and electrocardiography (ECG)-based methods of heart signal extraction. The relationship between HR and HRV was also systematically analyzed; HR was shown to have an inverse correlation with HRV. Applications to drug testing are also highlighted in this review. Furthermore, HR and HRV were shown to be regulated by the automatic nervous system; their connections with ECG measurements are also summarized herein.
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Affiliation(s)
- Dongmin Ling
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Science, University of Macau, Macao, China
| | - Huanxian Chen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Science, University of Macau, Macao, China
| | - Ging Chan
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Science, University of Macau, Macao, China; Department of Public Health and Medicinal Administration, Faculty of Health Sciences, University of Macau, Macao, China
| | - Simon Ming-Yuen Lee
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Science, University of Macau, Macao, China; Department of Pharmaceutical Sciences, Faculty of Health Sciences, University of Macau, Macao, China.
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Le T, Zhang J, Xia X, Xu X, Clark I, Schmiess-Heine L, Nguyen AH, Lau MPH, Cao H. Continuous Electrocardiogram Monitoring in Zebrafish with Prolonged Mild Anesthesia. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2020; 2020:2610-2613. [PMID: 33018541 DOI: 10.1109/embc44109.2020.9175576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The zebrafish model has been demonstrated as an ideal vertebrate model system for a diverse range of biological studies. Along with conventional approaches, monitoring and analysis of zebrafish electrocardiogram (ECG) have been utilized for cardio-physiological screening and elucidation. ECG monitoring has been carried out with fish treated with anesthetic drugs, rendering the short period of time in recording the signals (<5 min). In this work, a prolonged sedation system for continuous ECG monitoring of multiple zebrafish was proposed and developed. We built a circulation system to provide prolonged mild anesthesia which allows more consistent and intrinsic ECG measurement. The use of prolonged anesthesia helped reduce the concentration of the anesthetic drug (MS222 or Tricaine) from 200 mg/L to 100 mg/L and even lower; thus, maintaining the integrity of intrinsic ECG. Moreover, heartrate variation during recording was investigated, showing minute changes (±3.2 beats per minute - BPM). The development of this prolonged ECG monitoring system would open the possibility of long-term monitoring for studies such as drug screening and forward genetic screening.
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Dvornikov AV, Wang M, Yang J, Zhu P, Le T, Lin X, Cao H, Xu X. Phenotyping an adult zebrafish lamp2 cardiomyopathy model identifies mTOR inhibition as a candidate therapy. J Mol Cell Cardiol 2019; 133:199-208. [PMID: 31228518 PMCID: PMC6705397 DOI: 10.1016/j.yjmcc.2019.06.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 05/31/2019] [Accepted: 06/18/2019] [Indexed: 12/23/2022]
Abstract
Adult zebrafish is an emerging vertebrate model for studying genetic basis of cardiomyopathies; but whether the simple fish heart can model essential features of hypertrophic cardiomyopathy (HCM) remained unknown. Here, we report a comprehensive phenotyping of a lamp2 knockout (KO) mutant. LAMP2 encodes a lysosomal protein and is a causative gene of Danon disease that is characterized by HCM and massive autophagic vacuoles accumulation in the tissues. There is no effective therapy yet to treat this most lethal cardiomyopathy in the young. First, we did find the autophagic vacuoles accumulation in cardiac tissues from lamp2 KO. Next, through employing a set of emerging phenotyping tools, we revealed heart failure phenotypes in the lamp2 KO mutants, including decreased ventricular ejection fraction, reduced physical exercise capacity, blunted β-adrenergic contractile response, and enlarged atrium. We also noted changes of the following indices suggesting cardiac hypertrophic remodeling in lamp2 KO: a rounded heart shape, increased end-systolic ventricular volume and density of ventricular myocardium, elevated actomyosin activation kinetics together with increased maximal isometric tension at the level of cardiac myofibrils. Lastly, we assessed the function of lysosomal-localized mTOR on the lamp2-associated Danon disease. We found that haploinsufficiency of mtor was able to normalize some characteristics of the lamp2 KO, including ejection fraction, β-adrenergic response, and the actomyosin activation kinetics. In summary, we demonstrate the feasibility of modeling the inherited HCM in the adult zebrafish, which can be used to develop potential therapies.
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Affiliation(s)
- Alexey V Dvornikov
- Department of Biochemistry and Molecular Biology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Mingmin Wang
- Department of Biochemistry and Molecular Biology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA; Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Jingchun Yang
- Department of Biochemistry and Molecular Biology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Ping Zhu
- Department of Biochemistry and Molecular Biology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Tai Le
- Department of Electrical Engineering and Computer Science, University of California Irvine, CA, USA
| | - Xueying Lin
- Department of Biochemistry and Molecular Biology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Hung Cao
- Department of Electrical Engineering and Computer Science, University of California Irvine, CA, USA; Department of Biomedical Engineering, University of California Irvine, CA, USA
| | - Xiaolei Xu
- Department of Biochemistry and Molecular Biology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA.
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