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• W2034965475 abstract "In endothelial cells, the AMP-activated protein kinase (AMPK) is stimulated by sheer stress or growth factors that stimulate release of nitric oxide (NO). We hypothesized that NO might act as an endogenous activator of AMPK in endothelial cells. Exposure of human umbilical vein endothelial cells (HUVECs) to NO donors caused an increase in phosphorylation of both Thr-172 of AMPK and Ser-1177 of endothelial nitric oxide synthase, a downstream enzyme of AMPK. NO-induced activation of AMPK was not affected by inhibition of LKB1, an AMPK kinase. In contrast, inhibition of calcium calmodulin-dependent protein kinase kinase abolished the effect of NO in HUVECs. NO-induced AMPK activation in HeLa S3 cells was abolished by either 1H-(1,2,4)-oxadiazole[4,3-a]quinoxalon-1-one, a potent inhibitor for guanylyl cyclase, or 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid tetrakis (acetoxymethyl ester) (BAPTA-AM), an intracellular Ca(2+) chelator, indicating that NO-induced AMPK activation is guanylyl cyclase-mediated and calcium-dependent. Exposure of HUVECs or isolated mice aortas to either calcium ionophore A23187 or bradykinin significantly increased AMPK Thr-172 phosphorylation, which was abolished by N-nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthase. Finally, A23187- or bradykinin-enhanced AMPK activation was significantly greater in aortas from wild type mice than those in the aortas of endothelial nitric oxide synthase knock-out mice. Taken together, we conclude that NO might act as an endogenous AMPK activator." @default.
• W2034965475 created "2016-06-24" @default.
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• W2034965475 date "2008-10-01" @default.
• W2034965475 modified "2023-09-28" @default.
• W2034965475 title "Identification of Nitric Oxide as an Endogenous Activator of the AMP-activated Protein Kinase in Vascular Endothelial Cells" @default.
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• W2034965475 doi "https://doi.org/10.1074/jbc.m802578200" @default.
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