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• W2126120147 abstract "The molecular mechanisms of endothelial nitric oxide synthase (eNOS) regulation of microvascular permeability remain unresolved. Agonist-induced internalization may have a role in this process. We demonstrate here that internalization of eNOS is required to deliver NO to subcellular locations to increase endothelial monolayer permeability to macromolecules. Using dominant-negative mutants of dynamin-2 (dyn2K44A) and caveolin-1 (cav1Y14F), we show that anchoring eNOS-containing caveolae to plasma membrane inhibits hyperpermeability induced by platelet-activating factor (PAF), VEGF in ECV-CD8eNOSGFP (ECV-304 transfected cells) and postcapillary venular endothelial cells (CVEC). We also observed that anchoring caveolar eNOS to the plasma membrane uncouples eNOS phosphorylation at Ser-1177 from NO production. This dissociation occurred in a mutant- and cell-dependent way. PAF induced Ser-1177-eNOS phosphorylation in ECV-CD8eNOSGFP and CVEC transfected with dyn2K44A, but it dephosphorylated eNOS at Ser-1177 in CVEC transfected with cav1Y14F. Interestingly, dyn2K44A eliminated NO production, whereas cav1Y14F caused reduction in NO production in CVEC. NO production by cav1Y14F-transfected CVEC occurred in caveolae bound to the plasma membrane, and was ineffective in causing an increase in permeability. Our study demonstrates that eNOS internalization is required for agonist-induced hyperpermeability, and suggests that a mechanism by which eNOS is activated by phosphorylation at the plasma membrane and its endocytosis is required to deliver NO to subcellular targets to cause hyperpermeability." @default.
• W2126120147 created "2016-06-24" @default.
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• W2126120147 date "2009-04-21" @default.
• W2126120147 modified "2023-10-16" @default.
• W2126120147 title "Internalization of eNOS and NO delivery to subcellular targets determine agonist-induced hyperpermeability" @default.
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• W2126120147 doi "https://doi.org/10.1073/pnas.0812694106" @default.
• W2126120147 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2672508" @default.
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