Abstract
Adiponectin is an abundant plasma protein secreted from adipocytes that elicits protective effects in the vasculature and myocardium. In obesity and insulin-resistant states, adiponectin levels are reduced and loss of its protective effects might contribute to the excess cardiovascular risk observed in these conditions. Adiponectin ameliorates the progression of macrovascular disease in rodent models, consistent with its correlation with improved vascular outcomes in epidemiological studies. The mechanisms of adiponectin signaling are multiple and vary among its cellular sites of action. In endothelial cells, adiponectin enhances production of nitric oxide, suppresses production of reactive oxygen species, and protects cells from inflammation that results from exposure to high glucose levels or tumor necrosis factor, through activation of AMP-activated protein kinase and cyclic AMP-dependent protein kinase (also known as protein kinase A) signaling cascades. In the myocardium, adiponectin-mediated protection from ischemia–reperfusion injury is linked to cyclo-oxygenase-2-mediated suppression of tumor necrosis factor signaling, inhibition of apoptosis by AMP-activated protein kinase, and inhibition of excess peroxynitrite-induced oxidative and nitrative stress. In this Review, we provide an update of studies of the signaling effects of adiponectin in endothelial cells and cardiomyocytes.
Key Points
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Adiponectin is an abundant plasma protein secreted from adipocytes that elicits salutary effects in the vasculature and myocardium
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The mechanisms of adiponectin signaling are multiple and vary among its cellular sites of action
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In endothelial cells, adiponectin enhances nitric oxide, suppresses oxidative stress and suppresses the inflammatory signaling cascades via AMP-activated protein kinases and the cyclic AMP–protein kinase A-linked pathway
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In the myocardium, adiponectin reduces ischemia–reperfusion injury via COX-2-mediated suppression of tumor necrosis factor signaling, AMP-activated protein kinases, and inhibition of excess peroxynitrite-induced oxidative and nitrative stress
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Further work is necessary to elucidate the role of oligomeric forms of adiponectin in the heart and vasculature and their potential therapeutic value
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Goldstein, B., Scalia, R. & Ma, X. Protective vascular and myocardial effects of adiponectin. Nat Rev Cardiol 6, 27–35 (2009). https://doi.org/10.1038/ncpcardio1398
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DOI: https://doi.org/10.1038/ncpcardio1398
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