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Li J, Luo F, Liu X, Ou X, Liu T, Huang Y, Liu W, Yang Y, Tan X, Zhou S, Chen T. Dexmedetomidine inhibited arrhythmia susceptibility to adrenergic stress in RyR2 R2474S mice through regulating the coupling of membrane potential and intracellular calcium. Biochem Biophys Res Commun 2024; 720:150105. [PMID: 38754163 DOI: 10.1016/j.bbrc.2024.150105] [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: 05/05/2024] [Revised: 05/07/2024] [Accepted: 05/11/2024] [Indexed: 05/18/2024]
Abstract
BACKGROUND Dexmedetomidine (DEX), a highly selective α2-adrenoceptor agonist, can decrease the incidence of arrhythmias, such as catecholaminergic polymorphic ventricular tachycardia (CPVT). However, the underlying mechanisms by which DEX affects cardiac electrophysiological function remain unclear. METHODS Ryanodine receptor (RyR2) heterozygous R2474S mice were used as a model for CPVT. WT and RyR2R2474S/+ mice were treated with isoproterenol (ISO) and DEX, and electrocardiograms were continuously monitored during both in vivo and ex vivo experiments. Dual-dye optical mapping was used to explore the anti-arrhythmic mechanism of DEX. RESULTS DEX significantly reduced the occurrence and duration of ISO-induced of VT/VF in RyR2R2474S/+ mice in vivo and ex vivo. DEX remarkably prolonged action potential duration (APD80) and calcium transient duration (CaTD80) in both RyR2R2474S/+ and WT hearts, whereas it reduced APD heterogeneity and CaT alternans in RyR2R2474S/+ hearts. DEX inhibited ectopy and reentry formation, and stabilized voltage-calcium latency. CONCLUSION DEX exhibited an antiarrhythmic effect through stabilizing membrane voltage and intracellular Ca2+. DEX can be used as a beneficial perioperative anesthetic for patients with CPVT or other tachy-arrhythmias.
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Affiliation(s)
- Jianhong Li
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China; Department of Cardiology, The Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan, China
| | - Fangyi Luo
- Department of Cardiology, The Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan, China
| | - Xueru Liu
- Department of Anesthesiology, The Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan, China
| | - Xianhong Ou
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
| | - Ting Liu
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
| | - Yong Huang
- Department of Physiology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, China
| | - Weichao Liu
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
| | - Yan Yang
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
| | - Xiaoqiu Tan
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China; Department of Cardiology, The Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan, China; Department of Physiology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, Sichuan, China.
| | - Shuzhi Zhou
- Department of Anesthesiology, Ya'an People's Hospital, Ya'an, Sichuan, China.
| | - Tangting Chen
- Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China; Department of Cardiology, The Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan, China.
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Delisle BP, Aromolaran AS. New Insights into Cardiac Ion Channel Regulation 2.0. Int J Mol Sci 2023; 24:4999. [PMID: 36902430 PMCID: PMC10002907 DOI: 10.3390/ijms24054999] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Accepted: 02/21/2023] [Indexed: 03/08/2023] Open
Abstract
Sudden cardiac death (SCD) and arrhythmias represent a global public health problem, accounting for 15-20% of all deaths [...].
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Affiliation(s)
- Brian P. Delisle
- Department of Physiology, 741 S Limestone Street BBSRB B353, Lexington, KY 40536, USA
| | - Ademuyiwa S. Aromolaran
- Department of Surgery, Division of Cardiothoracic Surgery, Nora Eccles Harrison Cardiovascular Research and Training Institute, Salt Lake City, UT 84112, USA
- Department of Biomedical Engineering, Nutrition and Integrative Physiology, Biochemistry and Molecular Medicine Program, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
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