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GOTO A, KAMBAYASHI R, SAITO H, AKIE Y, IZUMI-NAKASEKO H, TAKEI Y, SUGIYAMA A. Characterization of the electrocardiogram of microminipig in comparison with that of Clawn miniature swine: impacts of miniaturization of body size on electrocardiographic indices. J Vet Med Sci 2023; 85:828-831. [PMID: 37302820 PMCID: PMC10466054 DOI: 10.1292/jvms.23-0049] [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: 01/29/2023] [Accepted: 05/31/2023] [Indexed: 06/13/2023] Open
Abstract
Effects of body size reduction on electrocardiographic indices were examined using microminipigs in comparison with Clawn miniature swine (Clawn). Electrocardiogram was recorded using Holter electrocardiograph in conscious state for 24 hr for microminipigs (male: 11.6 ± 0.1 kg, 12-17 months, n=5; and female: 9.9 ± 0.4 kg, 6 months, n=5) and Clawn (female: 20.3 ± 0.4 kg, 8-9 months, n=8). Microminipig had shorter PR interval and QRS width than Clawn, whereas no significant difference was detected in JTcF/QTcF between them. Ratios of PR interval, QRS width, and body weight cubic root for microminipigs to Clawn ranged between 0.713 and 0.830. These findings indicate that PR interval and QRS width will depend on distance for excitatory current propagation, whereas JTcF/QTcF may be governed by local electrical activities.
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Affiliation(s)
- Ai GOTO
- Department of Pharmacology, Faculty of Medicine, Toho
University, Tokyo, Japan
| | - Ryuichi KAMBAYASHI
- Department of Pharmacology, Faculty of Medicine, Toho
University, Tokyo, Japan
| | - Hiroyuki SAITO
- Department of Pharmacology, Faculty of Medicine, Toho
University, Tokyo, Japan
- CMIC Bioresearch Center, CMIC Pharma Science Co., Ltd.,
Yamanashi, Japan
| | - Yasuki AKIE
- Department of Pharmacology, Faculty of Medicine, Toho
University, Tokyo, Japan
- CMIC Bioresearch Center, CMIC Pharma Science Co., Ltd.,
Yamanashi, Japan
| | | | - Yoshinori TAKEI
- Department of Pharmacology, Faculty of Medicine, Toho
University, Tokyo, Japan
| | - Atsushi SUGIYAMA
- Department of Pharmacology, Faculty of Medicine, Toho
University, Tokyo, Japan
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Izumi-Nakaseko H, Sakamoto K, Goto A, Kambayashi R, Matsumoto A, Takei Y, Takahara A, Sugiyama A. Characterization of pathological remodeling in the chronic atrioventricular block cynomolgus monkey heart. Front Pharmacol 2023; 14:1055031. [PMID: 36744259 PMCID: PMC9892184 DOI: 10.3389/fphar.2023.1055031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 01/02/2023] [Indexed: 01/20/2023] Open
Abstract
We studied time course of pathological remodeling occurring in the cynomolgus monkey hearts against persistent atrioventricular block condition (n = 10). The atrioventricular block induced the ventricular and atrial dilation followed by the ventricular hypertrophy. Interstitial fibrosis in the ventricle was also observed along with gradual increases in the plasma angiotensin II and aldosterone concentrations. These adaptations were associated with the changes in gene expression profiling reflecting fibrosis and hypertrophy. Atrioventricular block reduced the ventricular rate and cardiac output, but the ejection fraction and stroke volume increased, whereas the cardiac output was gradually restored to its basal level. Systolic/diastolic blood pressure after the atrioventricular block was kept equal to or lower than that before the block, according with lack of increase in the plasma catecholamine levels. Chronic atrioventricular block gradually prolonged the QRS width and JT interval, leading to the QT interval prolongation in conscious state. 10 mg/kg of dl-sotalol hydrochloride induced torsade de pointes (TdP) in 6 out of 10 animals by 15 months. Animals showing longer QTcF under anesthesia after the atrioventricular block developed dl-sotalol-induced TdP earlier. No marked difference was observed in pharmacokinetics of dl-sotalol between 1 and 7 months after the atrioventricular block. Each TdP spontaneously terminated, reflecting a monkey's relatively small "effective size of the heart (=∛(left ventricular weight)/wavelength of reentry)". These fundamental knowledge will help better utilize the chronic atrioventricular block monkeys as an in vivo proarrhythmia model for detecting drug-induced TdP.
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Affiliation(s)
| | | | - Ai Goto
- Department of Pharmacology, Faculty of Medicine, Toho University, Tokyo, Japan
| | - Ryuichi Kambayashi
- Department of Pharmacology, Faculty of Medicine, Toho University, Tokyo, Japan
| | - Akio Matsumoto
- Department of Aging Pharmacology, Faculty of Medicine, Toho University, Tokyo, Japan
| | - Yoshinori Takei
- Department of Pharmacology, Faculty of Medicine, Toho University, Tokyo, Japan
| | - Akira Takahara
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Atsushi Sugiyama
- Department of Pharmacology, Faculty of Medicine, Toho University, Tokyo, Japan,Department of Aging Pharmacology, Faculty of Medicine, Toho University, Tokyo, Japan,*Correspondence: Atsushi Sugiyama,
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Loen V, Vos MA, van der Heyden MAG. The canine chronic atrioventricular block model in cardiovascular preclinical drug research. Br J Pharmacol 2021; 179:859-881. [PMID: 33684961 PMCID: PMC9291585 DOI: 10.1111/bph.15436] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 02/23/2021] [Accepted: 02/28/2021] [Indexed: 12/29/2022] Open
Abstract
Ventricular cardiac arrhythmia is a life threating condition arising from abnormal functioning of many factors in concert. Animal models mirroring human electrophysiology are essential to predict and understand the rare pro- and anti-arrhythmic effects of drugs. This is very well accomplished by the canine chronic atrioventricular block (CAVB) model. Here we summarize canine models for cardiovascular research, and describe the development of the CAVB model from its beginning. Understanding of the structural, contractile and electrical remodelling processes following atrioventricular (AV) block provides insight in the many factors contributing to drug-induced arrhythmia. We also review all safety pharmacology studies, efficacy and mechanistic studies on anti-arrhythmic drugs in CAVB dogs. Finally, we compare pros and cons with other in vivo preclinical animal models. In view of the tremendous amount of data obtained over the last 100 years from the CAVB dog model, it can be considered as man's best friend in preclinical drug research.
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Affiliation(s)
- Vera Loen
- Department of Medical Physiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Marc A Vos
- Department of Medical Physiology, University Medical Center Utrecht, Utrecht, The Netherlands
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Deng Y, Chen F, Li Y, Qian K, Wang R, Zhou XH. A powerful test for the maximum treatment effect in thorough QT/QTc studies. Stat Med 2021; 40:1947-1959. [PMID: 33463746 DOI: 10.1002/sim.8881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 10/21/2020] [Accepted: 01/01/2021] [Indexed: 11/08/2022]
Abstract
Parallel-group thorough QT/QTc studies focus on the change of QT/QTc values at several time-matched points from a pretreatment day (baseline) to a posttreatment day for different groups of treatment. The International Council for Harmonisation E14 stresses that QTc prolongation beyond a threshold represents high cardiac risk and calls for a test on the largest time-matched treatment effect (QTc prolongation). QT/QTc analysis usually assumes a jointly multivariate normal (MVN) distribution of pretreatment and posttreatment QT/QTc values, with a blocked compound symmetry covariance matrix. Existing methods use an analysis of covariance (ANCOVA) model including day-averaged baseline as a covariate to deal with the MVN model. However, the ANCOVA model tends to underestimate the variation of the estimator for treatment effects, resulting in the inflation of empirical type I error rate when testing whether the largest QTc prolongation is beyond a threshold. In this article, we propose two new methods to estimate the time-matched treatment effects under the MVN model, including maximum likelihood estimation and ordinary-least-square-based two-stage estimation. These two methods take advantage of the covariance structure and are asymptotically efficient. Based on these estimators, powerful tests for QT/QTc prolongation are constructed. Simulation shows that the proposed estimators have smaller mean square error, and the tests can control the type I error rate with high power. The proposed methods are applied on testing the carryover effect of diltiazem to inhibit dofetilide in a randomized phase 1 trial.
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Affiliation(s)
- Yuhao Deng
- School of Mathematical Sciences, Peking University, Beijing, China
| | - Fangyi Chen
- Department of Statistics, Columbia University, New York City, USA
| | - Yang Li
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Kaihuan Qian
- Department of Biostatistics, School of Public Health, Peking University, Beijing, China
| | - Rui Wang
- Department of Biostatistics, School of Public Health, Peking University, Beijing, China
| | - Xiao-Hua Zhou
- Department of Biostatistics, School of Public Health, Peking University, Beijing, China.,Beijing International Center for Mathematical Research, Peking University, Beijing, China
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Zhan XS, El-Ashram S, Luo DZ, Luo HN, Wang BY, Chen SF, Bai YS, Chen ZS, Liu CY, Ji HQ. A Comparative Study of Biological Characteristics and Transcriptome Profiles of Mesenchymal Stem Cells from Different Canine Tissues. Int J Mol Sci 2019; 20:ijms20061485. [PMID: 30934541 PMCID: PMC6471769 DOI: 10.3390/ijms20061485] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 03/18/2019] [Accepted: 03/21/2019] [Indexed: 12/11/2022] Open
Abstract
Mesenchymal stem cells (MSCs) are the most promising seed cells for cell therapy. Comparing the biological and transcriptome gene characteristics of MSCs from different sources provides an important basis for the screening of clinically used cells. The main purpose of this experiment was to establish methods for the isolation and culture of MSCs from five different canine sources, including adipose tissue, bone marrow, umbilical cord, amniotic membrane, and placenta, and compare biological and transcriptome characteristics of MSCs, in order to provide a basis for the clinical application of canine MSCs. MSCs were isolated from Chinese pastoral dogs, and the following experiments were performed: (1) the third, sixth, and ninth generations of cells were counted, respectively, and a growth curve was plotted to calculate the MSC population doubling time; (2) the expression of CD34 and CD44 surface markers was studied by immunofluorescence; (3) the third generation of cells were used for osteogenetic and adipogenic differentiation experiments; and (4) MSC transcriptome profiles were performed using RNA sequencing. All of the five types of MSCs showed fibroblast-like adherent growth. The cell surface expressed CD44 instead of CD34; the third-generation MSCs had the highest proliferative activity. The average population doubling time of adipose mesenchymal stem cells (AD-MSCs), placenta mesenchymal stem cells (P-MSCs), bone marrow mesenchymal stem cells (BM-MSCs), umbilical cord mesenchymal stem cells (UC-MSCs), and amniotic mesenchymal stem cells (AM-MSCs) were 15.8 h, 21.2 h, 26.2 h, 35 h, and 41.9 h, respectively. All five types of MSCs could be induced to differentiate into adipocytes and osteoblasts in vitro, with lipid droplets appearing after 8 days and bone formation occurring 5 days after AD-MSC induction. However, the multilineage differentiation for the remaining of MSCs was longer compared to that of the AD-MSCs. The MSC transcriptome profiles showed that AD-MSC and BM-MSCs had the highest homology, while P-MSCs were significantly different compared to the other four types of MSCs. All the isolated MSCs had the main biological characteristics of MSCs. AD-MSCs had the shortest time for proliferation, adipogenesis, and osteogenic differentiation.
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Affiliation(s)
- Xiao-Shu Zhan
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Saeed El-Ashram
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
- Faculty of Science, Kafrelsheikh University, Kafr el-Sheikh 33516, Egypt.
| | - Dong-Zhang Luo
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Hui-Na Luo
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Bing-Yun Wang
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Sheng-Feng Chen
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Yin-Shan Bai
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Zhi-Sheng Chen
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Can-Ying Liu
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
| | - Hui-Qin Ji
- School of Life Science and Engineering, Foshan University, Foshan 528231, China.
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