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• W2003048256 abstract "Myocardial energy and glucose homeostasis are crucial for normal cardiac structure and function. Peroxisome proliferator-activated receptors (PPARs) play an important role in controlling transcriptional expression of key enzymes that are involved in glucose metabolism, and they have been demonstrated to significantly reduce tissue injury in cardiovascular diseases. Adenosine monophosphate (AMP)-activated protein kinase (AMPK) is a sensor that maintains intracellular energy homeostasis and mediates a number of physiological signals. It has been reported that AMPK promotes glucose uptake. We hypothesize that PPARγ and α agonists may play a role in the regulation of glucose metabolism through AMPK. We tested this hypothesis by using isolated papillary muscles of rat hearts treated with PPARγ and α agonists, troglitazone and GW7647, respectively. Our results demonstrated that both troglitazone and GW7647 significantly stimulated 2-deoxyglucose uptake of cardiac muscles. Interestingly, both agonists stimulated phosphorylation of AMPK and its downstream protein target acetyl-CoA carboxylase. Endothelial nitric oxide synthase (eNOS) was also activated by both agonists. In addition, AMPK activator 5-amino-4-imidazole-1-β-D-carboxamide ribofuranoside increased glucose uptake, while AMPK inhibitor compound C and NOS inhibitor, Nω-nitro-l-arginine, significantly blocked troglitazone- and GW7647-stimulated glucose uptake in cardiac muscles. There was also a reduction of glucose uptake with a marked decrease in AMPK and eNOS phosphorylation. In conclusion, both PPARγ and α activation play a role in the regulation of glucose uptake in cardiac muscles and this regulation is mediated by the AMPK and eNOS signaling pathways." @default.
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• W2003048256 date "2010-07-01" @default.
• W2003048256 modified "2023-10-06" @default.
• W2003048256 title "Peroxisome proliferator-activated receptors γ and α agonists stimulate cardiac glucose uptake via activation of AMP-activated protein kinase☆" @default.
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• W2003048256 doi "https://doi.org/10.1016/j.jnutbio.2009.03.011" @default.
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