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• W2149441416 abstract "Objective— Tumor necrosis factor α (TNF-α), a key proinflammatory cytokine acting on the endothelium, activates endothelial nitric oxide synthase (eNOS). We have examined the signaling pathway leading to this activation and its biological role in endothelium, which are still unknown. Methods and Results— In human endothelial cells, we found that eNOS activation by TNF-α is time dependent and requires activation of Akt, a known eNOS activator. eNOS activation was preceded by sequential activation of neutral-sphingomyelinase-2 (N-SMase2) and sphingosine-kinase-1 (SK1) and generation of sphingosine-1-phosphate (Sph1P). Inhibition of N-SMase2 inhibited Sph1P formation, whereas inhibition of SK1 did not affect N-SMase2 activation by TNF-α. Blockade of N-SMase2, SK1, or the Sph1P receptors S1P 1 and S1P 3 , either by silencing or pharmacological inhibitors, prevented eNOS activation. Thus, eNOS is activated by TNF-α via S1P receptors, activated by Sph1P generated through N-SMase2 and SK1 activation. We found that nitric oxide generated through this pathway has a biological role, because it inhibits the expression of E-selectin and the adhesion of dendritic cells to the endothelium stimulated by TNF-α. Conclusions— This study establishes a previously undescribed link among TNF-α, Sph1P, and eNOS in a same signaling pathway of biological relevance in the process of endothelial cell activation by TNF-α." @default.
• W2149441416 created "2016-06-24" @default.
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• W2149441416 date "2006-01-01" @default.
• W2149441416 modified "2023-10-12" @default.
• W2149441416 title "Endothelial Nitric Oxide Synthase Activation by Tumor Necrosis Factor α Through Neutral Sphingomyelinase 2, Sphingosine Kinase 1, and Sphingosine 1 Phosphate Receptors" @default.
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• W2149441416 doi "https://doi.org/10.1161/01.atv.0000194074.59584.42" @default.
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• W2149441416 hasPublicationYear "2006" @default.
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