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This process is well studied in young animals, but little is known about pro-arrhythmic changes in aged animals. Senescent cells accumulate with age and accelerate age-associated diseases. Senescent cells interfere with cardiac function and outcome post-MI with age, but studies have not been performed in larger animals, and the mechanisms are unknown. Specifically, age-associated changes in timecourse of senescence and related changes in inflammation and fibrosis are not well understood. Additionally, the cellular and systemic role of senescence and its inflammatory milieu in influencing arrhythmogenesis with age is not clear, particularly in large animal models with cardiac electrophysiology more similar to humans than previously studied animal models. Here, we investigated the role of senescence in regulating inflammation, fibrosis, and arrhythmogenesis in young and aged infarcted rabbits. Aged rabbits exhibited increased peri-procedural mortality and arrhythmogenic electrophysiological remodeling at the infarct border zone (IBZ) compared to young rabbits. Studies of the aged infarct zone revealed persistent myofibroblast senescence and increased inflammatory signaling over a 12-week timecourse. Senescent IBZ myofibroblasts in aged rabbits appear to be coupled to myocytes, and our computational modeling showed that senescent myofibroblast-cardiomyocyte coupling prolongs action potential duration (APD) and facilitates conduction block permissive of arrhythmias. Aged infarcted human ventricles show levels of senescence consistent with aged rabbits, and senescent myofibroblasts also couple to IBZ myocytes. Our findings suggest that therapeutic interventions targeting senescent cells may mitigate arrhythmias post-MI with age.<\/jats:p>","DOI":"10.7554\/elife.84088","type":"journal-article","created":{"date-parts":[[2023,5,19]],"date-time":"2023-05-19T10:00:34Z","timestamp":1684490434000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.84088","source":"Crossref","is-referenced-by-count":13,"title":["Myofibroblast senescence promotes arrhythmogenic remodeling in the aged infarcted rabbit heart"],"prefix":"10.7554","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2227-0004","authenticated-orcid":true,"given":"Brett C","family":"Baggett","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05gq02987","id-type":"ROR","asserted-by":"publisher"}],"name":"Brown University","place":["Providence, United States"]},{"id":[{"id":"https:\/\/ror.org\/01aw9fv09","id-type":"ROR","asserted-by":"publisher"}],"name":"Cardiovascular Research Center, Rhode Island 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