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Abstract
Myocardial ischemia–reperfusion (MI/R) injury is characterized by iron deposition and reactive oxygen species production, which can induce ferroptosis. Ferroptosis has also been proposed to promote cardiomyocyte death. The current study sought to define the mechanism governing cardiomyocyte death in MI/R injury. An animal model of MI/R was established by ligation and perfusion of the left anterior descending coronary artery, and a cellular model of IR was constructed in cardiomyocytes. ChIP assay was then conducted to determine the interaction among USP22, SIRT1, p53, and SLC7A11. Loss- and gain-of-function assays were also conducted to determine the in vivo and in vitro roles of USP22, SIRT1, and SLC7A11. The infarct size and pathological changes of myocardial tissue were observed using TCC and hematoxylin–eosin staining, and the levels of cardiac function– and myocardial injury–related factors of rats were determined. Cardiomyocyte viability and apoptosis were evaluated in vitro, followed by detection of ferroptosis-related indicators (glutathione (GSH), reactive oxygen species, lipid peroxidation, and iron accumulation). USP22, SIRT1, and SLC7A11 expressions were found to be down-regulated, whereas p53 was highly expressed during MI/R injury. USP22, SIRT1, or SLC7A11 overexpression reduced the infarct size and ameliorated pathological conditions, cardiac function, as evidenced by reduced maximum pressure, ejection fraction, maximum pressure rate, and myocardial injury characterized by lower creatine phosphokinase and lactate dehydrogenase levels in vivo. Moreover, USP22, SIRT1, or SLC7A11 elevation contributed to enhanced cardiomyocyte viability and attenuated ferroptosis-induced cell death in vitro, accompanied by increased GSH levels, as well as decreased reactive oxygen species production, lipid peroxidation, and iron accumulation. Together, these results demonstrate that USP22 overexpression could inhibit ferroptosis-induced cardiomyocyte death to protect against MI/R injury via the SIRT1/p53/SLC7A11 association.
Highlights
Acute myocardial infarction (AMI) contributes to a large proportion of mortality across the globe
Reperfusion-caused death of cardiomyocytes, a feature of ischemic period, is characterized as the last form of injury, leading us to figure out the potential role of cell death mechanism underlying myocardial ischemia– reperfusion (MI/R) injury processes
Our findings demonstrated that USP22 overexpression inhibited ferroptosisinduced cardiomyocyte death to protect against MI/R injury via the SIRT1/p53/SLC7A11 pathway using in vivo and in vitro experimentation
Summary
Acute myocardial infarction (AMI) contributes to a large proportion of mortality across the globe. Myocardial reperfusion is usually implemented either with the application of thrombolytic treatment or primary percutaneous coronary intervention (Yellon and Hausenloy, 2007). These advanced measures possess the ability to swiftly recover blood circulation to the ischemic myocardium to salvage the living myocardium, minimize myocardial infarct size, maintain left ventricular systolic functions, and most importantly, avoid the happen of myocardial failure. The recovery of blood flow can bring about additional cardiac damage and complications, in particular, the death of cardiomyocytes, which is regarded as myocardial ischemia– reperfusion (MI/R) injury (Hausenloy and Yellon, 2013). Understanding the specific mechanism of ferroptosis-induced cardiomyocyte death could prove pivotal to achieve effective attenuation of MI/R injury
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