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Herraiz-Martínez A, Llach A, Tarifa C, Gandía J, Jiménez-Sabado V, Lozano-Velasco E, Serra SA, Vallmitjana A, Vázquez Ruiz de Castroviejo E, Benítez R, Aranega A, Muñoz-Guijosa C, Franco D, Cinca J, Hove-Madsen L. The 4q25 variant rs13143308T links risk of atrial fibrillation to defective calcium homoeostasis. Cardiovasc Res 2020; 115:578-589. [PMID: 30219899 PMCID: PMC6383060 DOI: 10.1093/cvr/cvy215] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 05/15/2018] [Accepted: 09/13/2018] [Indexed: 11/13/2022] Open
Abstract
AIMS Single nucleotide polymorphisms on chromosome 4q25 have been associated with risk of atrial fibrillation (AF) but the exiguous knowledge of the mechanistic links between these risk variants and underlying electrophysiological alterations hampers their clinical utility. Here, we tested the hypothesis that 4q25 risk variants cause alterations in the intracellular calcium homoeostasis that predispose to spontaneous electrical activity. METHODS AND RESULTS Western blotting, confocal calcium imaging, and patch-clamp techniques were used to identify mechanisms linking the 4q25 risk variants rs2200733T and rs13143308T to defects in the calcium homoeostasis in human atrial myocytes. Our findings revealed that the rs13143308T variant was more frequent in patients with AF and that myocytes from carriers of this variant had a significantly higher density of calcium sparks (14.1 ± 4.5 vs. 3.1 ± 1.3 events/min, P = 0.02), frequency of transient inward currents (ITI) (1.33 ± 0.24 vs. 0.26 ± 0.09 events/min, P < 0.001) and incidence of spontaneous membrane depolarizations (1.22 ± 0.26 vs. 0.56 ± 0.17 events/min, P = 0.001) than myocytes from patients with the normal rs13143308G variant. These alterations were linked to higher sarcoplasmic reticulum calcium loading (10.2 ± 1.4 vs. 7.3 ± 0.5 amol/pF, P = 0.01), SERCA2 expression (1.37 ± 0.13 fold, P = 0.03), and RyR2 phosphorylation at ser2808 (0.67 ± 0.08 vs. 0.47 ± 0.03, P = 0.01) but not at ser2814 (0.28 ± 0.14 vs. 0.31 ± 0.14, P = 0.61) in patients carrying the rs13143308T risk variant. Furthermore, the presence of a risk variant or AF independently increased the ITI frequency and the increase in the ITI frequency observed in carriers of the risk variants was exacerbated in those with AF. By contrast, the presence of a risk variant did not affect the amplitude or properties of the L-type calcium current in patients with or without AF. CONCLUSIONS Here, we identify the 4q25 variant rs13143308T as a genetic risk marker for AF, specifically associated with excessive calcium release and spontaneous electrical activity linked to increased SERCA2 expression and RyR2 phosphorylation.
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Affiliation(s)
- Adela Herraiz-Martínez
- Biomedical Research Institute Barcelona CSIC-IIBB Antiguo Hospital de la Santa Creu i Sant Pau, Pabellon 11, St Antoni Ma Claret 167, Barcelona, Spain.,IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Anna Llach
- IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Department of Cardiology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Carmen Tarifa
- Biomedical Research Institute Barcelona CSIC-IIBB Antiguo Hospital de la Santa Creu i Sant Pau, Pabellon 11, St Antoni Ma Claret 167, Barcelona, Spain.,IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Jorge Gandía
- Biomedical Research Institute Barcelona CSIC-IIBB Antiguo Hospital de la Santa Creu i Sant Pau, Pabellon 11, St Antoni Ma Claret 167, Barcelona, Spain
| | | | | | - Selma A Serra
- Biomedical Research Institute Barcelona CSIC-IIBB Antiguo Hospital de la Santa Creu i Sant Pau, Pabellon 11, St Antoni Ma Claret 167, Barcelona, Spain.,IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Alexander Vallmitjana
- Department of Automatic Control, Universitat Politècnica de Catalunya, Barcelona, Spain
| | | | - Raúl Benítez
- Department of Automatic Control, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Amelia Aranega
- Department of Experimental Biology, University of Jaén, Spain
| | | | - Diego Franco
- Department of Experimental Biology, University of Jaén, Spain
| | - Juan Cinca
- IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,Department of Cardiology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,CIBERCV, Spain
| | - Leif Hove-Madsen
- Biomedical Research Institute Barcelona CSIC-IIBB Antiguo Hospital de la Santa Creu i Sant Pau, Pabellon 11, St Antoni Ma Claret 167, Barcelona, Spain.,IIB Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.,CIBERCV, Spain
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Terentyev D, Hamilton S. Regulation of sarcoplasmic reticulum Ca 2+ release by serine-threonine phosphatases in the heart. J Mol Cell Cardiol 2016; 101:156-164. [PMID: 27585747 DOI: 10.1016/j.yjmcc.2016.08.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 08/26/2016] [Accepted: 08/27/2016] [Indexed: 12/17/2022]
Abstract
The amount and timing of Ca2+ release from the sarcoplasmic reticulum (SR) during cardiac cycle are the main determinants of cardiac contractility. Reversible phosphorylation of the SR Ca2+ release channel, ryanodine receptor type 2 (RyR2) is the central mechanism of regulation of Ca2+ release in cardiomyocytes. Three major serine-threonine phosphatases including PP1, PP2A and PP2B (calcineurin) have been implicated in modulation of RyR2 function. Changes in expression levels of these phosphatases, their activity and targeting to the RyR2 macromolecular complex were demonstrated in many animal models of cardiac disease and humans and are implicated in cardiac arrhythmia and heart failure. Here we review evidence in support of regulation of RyR2-mediated SR Ca2+ release by serine-threonine phosphatases and the role and mechanisms of dysregulation of phosphatases in various disease states.
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Affiliation(s)
- Dmitry Terentyev
- The Warren Alpert Medical School of Brown University, Rhode Island Hospital, Department of Medicine, Cardiovascular Research Center, United States.
| | - Shanna Hamilton
- Cardiff University, School of Medicine, Wales Heart Research Institute, United Kingdom
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Herraiz-Martínez A, Álvarez-García J, Llach A, Molina CE, Fernandes J, Ferrero-Gregori A, Rodríguez C, Vallmitjana A, Benítez R, Padró JM, Martínez-González J, Cinca J, Hove-Madsen L. Ageing is associated with deterioration of calcium homeostasis in isolated human right atrial myocytes. Cardiovasc Res 2015; 106:76-86. [PMID: 25712961 PMCID: PMC4362404 DOI: 10.1093/cvr/cvv046] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Aims Ageing-related cardiac disorders such as heart failure and atrial fibrillation often present with intracellular calcium homeostasis dysfunction. However, knowledge of the intrinsic effects of ageing on cellular calcium handling in the human heart is sparse. Therefore, this study aimed to analyse how ageing affects key mechanisms that regulate intracellular calcium in human atrial myocytes. Methods and results Whole membrane currents and intracellular calcium transients were measured in isolated human right atrial myocytes from 80 patients with normal left atrial dimensions and no history of atrial fibrillation. Patients were categorized as young (<55 years, n = 21), middle aged (55–74 years, n = 42), and old (≥75 years, n = 17). Protein levels were determined by western blot. Ageing was associated with the following electrophysiological changes: (i) a 3.2-fold decrease in the calcium transient (P < 0.01); (ii) reduction of the L-type calcium current (ICa) amplitude (2.4 ± 0.3 pA/pF vs. 1.4 ± 0.2 pA/pF, P < 0.01); (iii) lower levels of L-type calcium channel alpha-subunit (P < 0.05); (iv) lower rates of both fast (14.5 ± 0.9 ms vs. 20.9 ± 1.9, P < 0.01) and slow (73 ± 3 vs. 120 ± 12 ms, P < 0.001) ICa inactivation; and (v) a decrease in the sarcoplasmic reticulum calcium content (10.1 ± 0.8 vs. 6.4 ± 0.6 amol/pF, P < 0.005) associated with a significant decrease in both SERCA2 (P < 0.05) and calsequestrin-2 (P < 0.05) protein levels. In contrast, ageing did not affect spontaneous sarcoplasmic reticulum calcium release. Conclusion Ageing is associated with depression of SR calcium content, L-type calcium current, and calcium transient amplitude that may favour a progressive decline in right atrial contractile function with age.
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Affiliation(s)
- Adela Herraiz-Martínez
- Cardiovascular Research Centre CSIC-ICCC and IIB-Sant Pau, Hospital de la Santa Creu i Sant Pau, St Antoni Mª Claret 167, Barcelona 08025, Spain
| | - Jesus Álvarez-García
- Department of Cardiology, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Anna Llach
- Department of Cardiology, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Cristina E Molina
- Cardiovascular Research Centre CSIC-ICCC and IIB-Sant Pau, Hospital de la Santa Creu i Sant Pau, St Antoni Mª Claret 167, Barcelona 08025, Spain
| | - Jacqueline Fernandes
- Department of Cardiology, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Andreu Ferrero-Gregori
- Department of Cardiology, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Cristina Rodríguez
- Cardiovascular Research Centre CSIC-ICCC and IIB-Sant Pau, Hospital de la Santa Creu i Sant Pau, St Antoni Mª Claret 167, Barcelona 08025, Spain
| | - Alexander Vallmitjana
- Department of Automatic Control, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Raúl Benítez
- Department of Automatic Control, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Josep M Padró
- Department of Cardiac Surgery, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Barcelona, Spain
| | - José Martínez-González
- Cardiovascular Research Centre CSIC-ICCC and IIB-Sant Pau, Hospital de la Santa Creu i Sant Pau, St Antoni Mª Claret 167, Barcelona 08025, Spain
| | - Juan Cinca
- Department of Cardiology, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Leif Hove-Madsen
- Cardiovascular Research Centre CSIC-ICCC and IIB-Sant Pau, Hospital de la Santa Creu i Sant Pau, St Antoni Mª Claret 167, Barcelona 08025, Spain
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