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- W2077808518 abstract "Endothelial nitric oxide synthase (eNOS) is constitutively expressed in endothelial cells lining the blood vessel and the heart. It plays a major role in vascular and tissue protection. Its activity is tightly controlled by an intramolecular autoinhibitory element that hinders calmodulin binding. This molecular hindrance is removed by elevated intracellular calcium levels. The catalytic activity of eNOS is augmented by phosphorylation of a C-terminal serine residue (Ser-1177 of human eNOS) through the phosphatidyl-3 kinase (PI-3K)/Akt pathway. Its activity is also enhanced by binding to heat shock protein-90. These two processes are calcium independent. The two biochemical events appear to facilitate calmodulin access to its binding site. eNOS is upregulated at the transcriptional level. Its upregulation is mediated by an increased Sp1 binding to its cognate site on eNOS promoter/enhancer region via the action of protein phosphatase 2A (PP2A). PP2A is activated by a signaling pathway including PI-3gamma --> Janus activated kinase 2 (Jak2) --> MEK-1 --> ERK1 and 2. The transcriptional and posttranslational enhancement of eNOS activity is two- to threefold above the basal level. A higher magnitude of augmentation of eNOS gene expression can be achieved by gene transfer, which confers protection against vascular diseases and ischemia-induced tissue injury in experimental animals. These findings provide new insight into the protective role of eNOS and the therapeutic potential of eNOS gene therapy." @default.
- W2077808518 created "2016-06-24" @default.
- W2077808518 creator A5035975194 @default.
- W2077808518 date "2002-05-01" @default.
- W2077808518 modified "2023-09-27" @default.
- W2077808518 title "Regulation of Endothelial Nitric Oxide Synthase Activity and Gene Expression" @default.
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- W2077808518 doi "https://doi.org/10.1111/j.1749-6632.2002.tb04062.x" @default.
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