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High-Fructose Diet Induces Cardiac Dysfunction via Macrophage Recruitment in Adult Mice.
Cardiovascular diseases are the leading cause of death globally, including cardiac fibrosis, myocardial infarction, cardiac hypertrophy, and heart failure. High fat/ fructose induces metabolic syndrome, hypertension and obesity, which contributes to cardiac hypertrophy and fibrosis. Excessive fructose intake accelerates inflammation in different organs and tissues, and molecular and cellular mechanisms of organ and tissue injury have been demonstrated. However, the mechanisms of cardiac inflammation have not been fully documented in high-fructose diet. This study shows that there are significantly increased in cardiomyocytes size and relative wall thickness of LV in high-fructose fed adult mice. With echocardiographic analysis of cardiac function, the ejection fraction (EF%) and fractional shortening (FS%) are significantly reduced at 12 weeks after 60% high-fructose diet. The mRNA and protein levels of MCP-1 are notably increased in high-fructose treated HL-1 and primary cardiomyocyte respectively. Also, the increased protein level of MCP-1 has been detected in vivo mouse model after 12 weeks feeding, resulting in the production of pro-inflammatory makers, pro-fibrotic genes expression, and macrophage infiltration. These data demonstrate that high-fructose intake induces cardiac inflammation via macrophage recruitment in cardiomyocyte, which contributes to impair cardiac function.
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