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• W2019468623 abstract "Estrogen induces both rapid and delayed effects on the cardiovascular system. The early effects take place within minutes (e.g., changes in vasomotor tone) and are mediated through rapid intracellular signaling pathways; whereas the delayed effects (e.g., remodeling or lipid alterations) require hours to days to occur and require transcriptional effects with subsequent modulation of protein expression. To study the acute effects of 17β-estradiol (E2) treatment on vascular function, we have investigated the rapid (on the order of minutes) effects of E2 treatment on intracellular signaling in human endothelial cells (EC). Our previous data have shown that E2 induces rapid release of NO from and activation of guanylate cyclase in human EC. In this study, we demonstrate that E2 also activates mitogen-activated protein kinase (extracellular signal-related kinase) signaling within minutes in EC. We hypothesized that this effect might be mediated by estrogen receptors (ER) localized to the cell surface. Our data show that membrane-impermeant forms of E2 also activate EC mitogen-activated protein kinase as well as stimulate cGMP production and NO release. The ER antagonist ICI 182,780 blocks this effect. Using confocal microscopy and flow cytometric analysis, we demonstrate that EC contain surface binding sites for E2, detectable by cell-impermeant ligand binding and equally with an anti-ERα antibody. Immunoreactive bands of 66 and 45 kDa are detectable with an anti-ERα mAb in human EC, and their individual presence correlates functionally with E2-stimulated genomic and rapid nongenomic responses, respectively. Membrane ERs may provide key molecular switches in these novel, rapid signaling pathways induced by E2 in EC." @default.
• W2019468623 created "2016-06-24" @default.
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• W2019468623 date "2000-05-23" @default.
• W2019468623 modified "2023-09-23" @default.
• W2019468623 title "Human vascular endothelial cells contain membrane binding sites for estradiol, which mediate rapid intracellular signaling" @default.
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• W2019468623 doi "https://doi.org/10.1073/pnas.97.11.5930" @default.
• W2019468623 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/18536" @default.
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