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Lookup NU author(s): Dr Rachael Redgrave, Dr Emily Dookun, Laura Booth, Dr Maria Camacho EncinaORCiD, Dr Omowumi Folaranmi, Dr Simon Tual-ChalotORCiD, Dr Jason GillORCiD, Dr Andrew OwensORCiD, Professor Ioakim SpyridopoulosORCiD, Dr Joao Passos, Professor Gavin RichardsonORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Myocardial infarction is a leading cause of morbidity and mortality. While reperfusion is now standard therapy, pathological remodelling leading to heart failure remains a clinical problem. Cellular senescence has been shown to contribute to disease pathophysiology and treatment with the senolytic navitoclax attenuates inflammation, reduces adverse myocardial remodelling and results in improved functional recovery. However, it remains unclear which senescent cell populations contribute to these processes. To identify whether senescent cardiomyocytes contribute to disease pathophysiology post-myocardial infarction, we established a transgenic model in which p16 (CDKN2A) expression was specifically knocked-out in the cardiomyocyte population. Following myocardial infarction, mice lacking cardiomyocyte p16 expression demonstrated no difference in cardiomyocyte hypertrophy but exhibited improved cardiac function and significantly reduced scar size in comparison to control animals. This data demonstrates that senescent cardiomyocytes participate in pathological myocardial remodelling. Importantly, inhibition of cardiomyocyte senescence led to reduced senescence-associated inflammation and decreased senescence-associated markers within other myocardial lineages, consistent with the hypothesis that cardiomyocytes promote pathological remodelling by spreading senescence to other cell-types. Collectively this study presents the demonstration that senescent cardiomyocytes are major contributors to myocardial remodelling and dysfunction following a myocardial infarction. Therefore, to maximise the potential for clinical translation, it is important to further understand the mechanisms underlying cardiomyocyte senescence and how to optimise senolytic strategies to target this cell lineage.
Author(s): Redgrave R, Dookun E, Booth LK, Camacho Encina M, Folaranmi O, Tual-Chalot S, Gill JH, Owens WA, Spyridopoulos I, Passos JF, Richardson GD
Publication type: Article
Publication status: Published
Journal: npj Aging
Year: 2023
Volume: 9
Print publication date: 14/06/2023
Online publication date: 14/06/2023
Acceptance date: 01/06/2023
Date deposited: 20/06/2023
ISSN (electronic): 2731-6068
Publisher: Nature
URL: https://doi.org/10.1038/s41514-023-00113-5
DOI: 10.1038/s41514-023-00113-5
PubMed id: 37316516
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