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Due to an incomplete understanding of the molecular mechanisms, the clinical use of RAAS antagonism in obesity\u2010associated cardiometabolic complications remains uncertain. The present study investigated the effects and associated molecular mechanisms of eplerenone, a selective mineralocorticoid receptor antagonist, in the heart and kidney of obesity.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Male C57BL\/6 mice were fed a high\u2010fat diet (HFD) for 12\u2009weeks before receiving either vehicle or eplerenone treatments for 30\u2009days while maintained on HFD. Cardiac function was measured by pressure\u2013volume (PV) loop analyses. Renal function was assessed by renal morphology and serum creatinine concentrations. Chow\u2010fed mice were used as lean controls.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>HFD feeding impaired cardiac and renal function in mice, evidenced by elevated blood pressures, stroke work, Tau, glomerular hypertrophy and tubular injury. Eplerenone treatment caused weight loss, which was attributed to a loss in fat mass. Moreover, eplerenone treatment ameliorated both HFD\u2010induced cardiac and renal dysfunction, including a decrease in stroke volume, cardiac output and stroke work; an increase in ejection fraction; and a decrease in glomerular hypertrophy, tubular injury, renal fibrosis and serum creatinine concentrations. Mechanistically, eplerenone decreased CD44 but increased RHAMM and TGF\u2010\u03b2 expression in the heart. In contrast, eplerenone caused a decrease in the hyaluronan\u2010CD44\/RHAMM pathway, TGF\u2010\u03b2, IL\u20106 and phosphorylation of Akt and JNK in the kidney.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Eplerenone treatment improved kidney function and cardiac performance in obese male mice. The potential link between the mineralocorticoid receptor and the hyaluronan\u2010CD44\/RHAMM pathway is novel and has not been previously reported.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/dme.70154","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T15:50:11Z","timestamp":1759506611000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Eplerenone improves kidney function and cardiac performance in obese male mice"],"prefix":"10.1111","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-4951-8445","authenticated-orcid":false,"given":"Ayman K.","family":"Banah","sequence":"first","affiliation":[{"name":"Division of Diabetes, Endocrinology, and Reproductive Biology, School of Medicine University of Dundee  Dundee, Scotland UK"},{"name":"Nursing Sciences and Research, College of Nursing Umm Al\u2010Qura University  Makkah Saudi 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