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Lim WW, Neo M, Thanigaimani S, Kuklik P, Ganesan AN, Lau DH, Tsoutsman T, Kalman JM, Semsarian C, Saint DA, Sanders P. Electrophysiological and Structural Remodeling of the Atria in a Mouse Model of Troponin-I Mutation Linked Hypertrophic Cardiomyopathy: Implications for Atrial Fibrillation. Int J Mol Sci 2021; 22:ijms22136941. [PMID: 34203369 PMCID: PMC8267948 DOI: 10.3390/ijms22136941] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 06/22/2021] [Accepted: 06/22/2021] [Indexed: 01/26/2023] Open
Abstract
Hypertrophic cardiomyopathy (HCM) is an inherited cardiac disorder affecting one in 500 of the general population. Atrial fibrillation (AF) is the most common arrhythmia in patients with HCM. We sought to characterize the atrial electrophysiological and structural substrate in young and aging Gly203Ser cardiac troponin-I transgenic (HCM) mice. At 30 weeks and 50 weeks of age (n = 6 per strain each group), the left atrium was excised and placed on a multi-electrode array (MEA) for electrophysiological study; subsequent histological analyses and plasma samples were analyzed for biomarkers of extracellular matrix remodeling and cell adhesion and inflammation. Wild-type mice of matched ages were included as controls. Young HCM mice demonstrated significantly shortened atrial action potential duration (APD), increased conduction heterogeneity index (CHI), increased myocyte size, and increased interstitial fibrosis without changes in effective refractory periods (ERP), conduction velocity (CV), inflammatory infiltrates, or circulating markers of extracellular matrix remodeling and inflammation. Aging HCM mice demonstrated aggravated changes in atria electrophysiology and structural remodeling as well as increased circulating matrix metalloproteinases (MMP)-2, MMP-3, and VCAM-1 levels. This model of HCM demonstrates an underlying atrial substrate that progresses with age and may in part be responsible for the greater propensity for AF in HCM.
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Affiliation(s)
- Wei-Wen Lim
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
- National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore 169609, Singapore
- Programme in Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Medical School, Singapore 169857, Singapore
| | - Melissa Neo
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
| | - Shivshankar Thanigaimani
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
- The Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry and The Australian Institute of Tropical Health and Medicine, James Cook University, Townsville, QLD 4811, Australia
| | - Pawel Kuklik
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
- Department of Cardiology, Asklepios Klinik St. Georg, 20099 Hamburg, Germany
| | - Anand N. Ganesan
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
- Department of Cardiovascular Medicine, Flinders Medical Centre, Bedford Park, SA 5042, Australia
| | - Dennis H. Lau
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
| | - Tatiana Tsoutsman
- Agnes Ginges Centre for Molecular Cardiology, Centenary Institute and the University of Sydney, Camperdown, NSW 2050, Australia; (T.T.); (C.S.)
| | - Jonathan M. Kalman
- Department of Cardiology, Royal Melbourne Hospital, Faculty of Medicine, Dentistry, and Health Sciences, University of Melbourne, Parkville, VIC 3010, Australia;
| | - Christopher Semsarian
- Agnes Ginges Centre for Molecular Cardiology, Centenary Institute and the University of Sydney, Camperdown, NSW 2050, Australia; (T.T.); (C.S.)
| | - David A. Saint
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
- Correspondence: (D.A.S.); (P.S.); Tel.: +618-8222-2723 (P.S.)
| | - Prashanthan Sanders
- Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute (SAHMRI), University of Adelaide and the Royal Adelaide Hospital, Adelaide, SA 5000, Australia; (W.-W.L.); (M.N.); (S.T.); (P.K.); (A.N.G.); (D.H.L.)
- Correspondence: (D.A.S.); (P.S.); Tel.: +618-8222-2723 (P.S.)
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Fan B, Wang H, Wu T, Li Y, Lin Z, Li M, Li Q, Zhang W, Zheng Q. Electrophysiological Measurement of Rat Atrial Epicardium Using a Novel Stereotaxic Apparatus. Int Heart J 2019; 60:400-410. [DOI: 10.1536/ihj.18-215] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Boyuan Fan
- Department of Cardiology, The Second Affiliate Hospital of Xi'an Jiaotong University
| | - Hongtao Wang
- Department of Cardiology, The Second Affiliate Hospital of Xi'an Jiaotong University
| | - Tao Wu
- China Coal Xi'an Design Engineering Co., Ltd; Xi'an
| | - Yingqi Li
- Department of Cardiology, The Second Affiliate Hospital of Xi'an Jiaotong University
| | - Zehao Lin
- Department of Cardiology, The Second Affiliate Hospital of Xi'an Jiaotong University
| | - Mengying Li
- Department of Endocrinology, Xijing Hospital of the Fourth Military Medicine University
| | - Qing Li
- Department of Cardiology, The Second Affiliate Hospital of Xi'an Jiaotong University
| | - Wei Zhang
- Department of Pharmacy, Xijing Hospital of the Fourth Military Medicine University
| | - Qiangsun Zheng
- Department of Cardiology, The Second Affiliate Hospital of Xi'an Jiaotong University
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