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Journal Article
Research Support, Non-U.S. Gov't
The roles of eicosanoids in myocardial diseases.
Myocardial disease, the abnormalities of the cardiac muscle, is the leading cause of death in humans. Eicosanoids represent a large spectrum of lipid mediators with critical roles in physiological and pathophysiological conditions. Arachidonic acid (AA) is the major resource of eicosanoids and is metabolized via cyclooxygenases (COXs), lipoxygenases (LOXs), and cytochrome P450 (CYP) enzymes producing a diverse family of lipid mediators called eicosanoids, including prostanoids, leukotrienes (LTs), epoxyeicosatrienoic acids (EETs), dihydroxyeicosatetraenoic acid (diHETEs), eicosatetraenoic acids (ETEs), and lipoxins (LXs). Beyond the well-established roles of eicosanoids in inflammation and vascular biology, a growing body of evidence showed that eicosanoids, especially CYP450 derived eicosanoids EETs, are preventive and therapeutic targets for many of the myocardial diseases. EETs not only ameliorate the cardiac injury and remodeling in different pathological models, but also attenuate subsequent hemodynamic disturbances and cardiac dysfunction. EETs have direct and indirect protective properties in the myocardium, and thus relieve dietetic cardiomyopathy and inflammatory cardiomyopathy. Moreover, EETs are capable to attenuate the ischemic cardiomyopathy, including the myocardial infarction and cardiac ischemic reperfusion injury. Multiple biological events and signaling networks are targeted during the myocardial protection of EETs, these are including mitochondria hemostasis, angiogenesis, oxidative stress, inflammatory response, metabolic regulation, endoplasmic reticulum (ER) stress and cell death. Additionally, eicosanoids from COX and LOX also have important roles in some of the myocardial diseases, such as cardiac hypertrophy and ischemic heart disease. This chapter summarizes the physiological and pathophysiological significance, and the signal mechanisms of the eicosanoids, especially the EETs, in myocardial diseases.
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