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Intracellular potassium ion (K<jats:sup>+<\/jats:sup>) homeostasis, which is modulated by K<jats:sup>+<\/jats:sup> channels and transporters, is crucial for maintaining normal myocardial function and can be disrupted by HF. This study is aimed at exploring the protective effect of TMZ on K<jats:sup>+<\/jats:sup> homeostasis within myocardial tissue in mice with HF. We observed the pathological changes of myocardial tissue under microscopes and further measured the content of adenosine triphosphate (ATP), the activity of Na<jats:sup>+<\/jats:sup>\u2010K<jats:sup>+<\/jats:sup> ATPase, and the expression of ATP1<jats:italic>\u03b1<\/jats:italic>1 at the mRNA and protein levels. Moreover, we also analyzed the changes in K<jats:sup>+<\/jats:sup> flux across the myocardial tissue in mice. As a result, we found that there was a large amount of myocardial fiber lysis and fracture in HF myocardial tissue. Meanwhile, the potassium flux of mice with HF was reduced, and the expression of ATP1<jats:italic>\u03b1<\/jats:italic>1, the activity of Na<jats:sup>+<\/jats:sup>\u2010K<jats:sup>+<\/jats:sup> ATPase, and the supply and delivery of ATP were also decreased. In contrast, TMZ can effectively treat HF by restoring K<jats:sup>+<\/jats:sup> homeostasis in the local microenvironment of myocardial tissues.<\/jats:p>","DOI":"10.1155\/2022\/2387860","type":"journal-article","created":{"date-parts":[[2022,1,19]],"date-time":"2022-01-19T22:05:06Z","timestamp":1642629906000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Protective Effect of Trimetazidine on Potassium Ion Homeostasis in Myocardial Tissue in Mice with Heart 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