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• W2000709663 abstract "Myocardial infarct size is determined by the death of nonischemic border zone cardiomyocytes caused by export of injury signals from the infarct zone. The countermeasures to limit infarct size, therefore, should be aimed at nonselective blockade of most, if not all, injury signals from entering nonischemic cells. To test whether inhibition of endocytosis might limit infarct size, HL-1 cardiomyocytes were subjected to anoxia (6 h) and reoxygenation (1 h). Anoxic and reoxygenated cells showed a multifold increase in mitochondrial ROS production accompanied with upregulation of scavenger receptors lectin-like oxidized low-density lipoprotein receptor-1 and CD36 and stimulation of stress signals, including NADPH oxidase subunit p22 phox , SOD2, and beclin-1. Incubation of healthy cardiomyocytes in media from anoxic and reoxygenated cells (conditioned media) resulted in qualitatively similar responses, including increase in the generation of mitochondrial ROS, p22 phox , SOD2, and beclin-1. Anoxia and reoxygenation caused collapse of clathrin-mediated endocytosis and stimulation of macropinocytosis, whereas in cultures exposed to conditioned media, the activity of endocytosis was uniformly higher. Conditioned media also significantly aggravated cytotoxic effects of TNF-α and angiotensin II, and suppression of endocytosis reversed these trends, resulting in an overall increase of metabolic activity. Moreover, inhibition of endocytosis prevented binding of oxidized cellular fragments with greater efficiency than targeted neutralization of the scavenger receptor lectin-like oxidized low-density lipoprotein receptor-1. Many of the observations in HL-1 cardiomyocytes were confirmed in primary cardiomyocyte cultures. Our data suggest that endocytosis is upregulated in border zone cardiomyocytes, and inhibition of endocytosis may be an effective approach to prevent export of injury signals from the infarct zone." @default.
• W2000709663 created "2016-06-24" @default.
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• W2000709663 date "2014-06-15" @default.
• W2000709663 modified "2023-09-27" @default.
• W2000709663 title "Prevention of export of anoxia/reoxygenation injury from ischemic to nonischemic cardiomyocytes via inhibition of endocytosis" @default.
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• W2000709663 doi "https://doi.org/10.1152/ajpheart.00043.2014" @default.
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