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Article

Degree of Fibrosis in Human Atrial Tissue Is Not the Hallmark Driving AF

1
Department of Physiology, Amsterdam Cardiovascular Sciences, Amsterdam University Medical Centers, 1081 HV Amsterdam, The Netherlands
2
Department Cardiology, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands
3
Department of Cardiothoracic Surgery, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands
4
Department of Physiology, University Maastricht, 6211 LK Maastricht, The Netherlands
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Raj Kishore and Partha Dutta
Cells 2022, 11(3), 427; https://doi.org/10.3390/cells11030427
Received: 15 December 2021 / Revised: 11 January 2022 / Accepted: 20 January 2022 / Published: 26 January 2022
Background: The current paradigm is that fibrosis promotes electrophysiological disorders and drives atrial fibrillation (AF). In this current study, we investigated the relation between the degree of fibrosis in human atrial tissue samples of controls and patients in various stages of AF and the degree of electrophysiological abnormalities. Methods: The degree of fibrosis was measured in the atrial tissue and serum of patients in various stages of AF and the controls. Hereto, picrosirius and H&E staining were performed to quantify degree of total, endo-perimysial fibrosis, and cardiomyocyte diameter. Western blot quantified fibrosis markers: neural cell adhesion molecule, tissue inhibitor of metalloproteinase, lysyl oxidase, and α-smooth muscle actin. In serum, the ratio carboxyl-terminal telopeptide of collagen/matrix-metalloproteinase1 was determined. High-resolution epicardial mapping evaluated low-voltage areas and conduction abnormalities. Results: No significant differences were observed in the degree of fibrosis between the groups. Finally, no significant correlation—absolute nor spatial—was observed between all electrophysiological parameters and histological fibrosis markers. Conclusions: No differences in the degree of fibrosis were observed in patients from various stages of AF compared to the controls. Moreover, electrophysiological abnormalities did not correlate with any of the fibrosis markers. The findings indicate that fibrosis is not the hallmark of structural remodeling in AF. View Full-Text
Keywords: atrial fibrillation; fibrosis; (bio)markers; cardiac mapping; structural remodeling; electrical remodeling atrial fibrillation; fibrosis; (bio)markers; cardiac mapping; structural remodeling; electrical remodeling
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MDPI and ACS Style

S. Ramos, K.; Pool, L.; van Schie, M.S.; Wijdeveld, L.F.J.M.; van der Does, W.F.B.; Baks, L.; Sultan, H.M.D.; van Wijk, S.W.; Bogers, A.J.J.C.; Verheule, S.; de Groot, N.M.S.; Brundel, B.J.J.M. Degree of Fibrosis in Human Atrial Tissue Is Not the Hallmark Driving AF. Cells 2022, 11, 427. https://doi.org/10.3390/cells11030427

AMA Style

S. Ramos K, Pool L, van Schie MS, Wijdeveld LFJM, van der Does WFB, Baks L, Sultan HMD, van Wijk SW, Bogers AJJC, Verheule S, de Groot NMS, Brundel BJJM. Degree of Fibrosis in Human Atrial Tissue Is Not the Hallmark Driving AF. Cells. 2022; 11(3):427. https://doi.org/10.3390/cells11030427

Chicago/Turabian Style

S. Ramos, Kennedy, Lisa Pool, Mathijs S. van Schie, Leonoor F.J.M. Wijdeveld, Willemijn F.B. van der Does, Luciënne Baks, H. M.D. Sultan, Stan W. van Wijk, Ad J.J.C. Bogers, Sander Verheule, Natasja M.S. de Groot, and Bianca J.J.M. Brundel. 2022. "Degree of Fibrosis in Human Atrial Tissue Is Not the Hallmark Driving AF" Cells 11, no. 3: 427. https://doi.org/10.3390/cells11030427

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