title: Endothelial Cell Activation Is Regulated by Epidermal Growth Factor-like Domain 7 (Egfl7) during Inflammation.
abstract: Activation of the blood vessel endothelium is a critical step during inflammation. Endothelial cells stimulated by pro-inflammatory cytokines play an essential part in the adhesion and extravasation of circulating leukocytes into inflamed tissues. The endothelial egfl7 gene (VE-statin) represses endothelial cell activation in tumors, and prior observations suggested that it could also participate in the regulation of endothelial cell activation during inflammation. We show here that Egfl7 expression is strongly repressed in mouse lung endothelial cells during LPS- and TNFα-induced inflammation in vivo LPS have a limited effect on Egfl7 expression by endothelial cells in vitro, whereas the pro-inflammatory cytokine TNFα strongly represses Egfl7 expression in endothelial cells. TNFα regulates the egfl7 gene promoter through regions located between -7585 and -5550 bp ahead of the main transcription start site and via an NF-κB-dependent mechanism. Conversely, Egfl7 regulates the response of endothelial cells to TNFα by restraining the induced expression of intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin, resulting in a decreased adhesion of leukocytes onto endothelial cells stimulated by TNFα. Egfl7 regulates the expression of these adhesion molecules through the NF-κB and MEK/Erk pathways, in particular by preventing the proteasome-mediated degradation of IkBα both in non-activated endothelial cells and during activation. Egfl7 is thus an endogenous and constitutive repressor of blood vessel endothelial cell activation in normal and inflammatory conditions and participates in a loop of regulation of activation of these cells by pro-inflammatory cytokines.
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Pinte
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Caetano
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Le Bras
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Chantal
authors.initials: C
authors.lastname: Havet
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Villain
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Racha
authors.initials: R
authors.lastname: Dernayka
authors.affiliation: the Institut Pasteur de Lille, F-59000 Lille, France.|U1019-UMR 8204, Center for Infection and Immunity of Lille, Université de Lille, F-59000 Lille, France.|UMR 8204, CNRS, F-59000 Lille, France.|U1019, INSERM, and.
authors.forename: Catherine
authors.initials: C
authors.lastname: Duez
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Virginie
authors.initials: V
authors.lastname: Mattot
authors.affiliation: UMR 8161-M3T, Mechanisms of Tumorigenesis and Targeted Therapies and fabrice.soncin@ibl.cnrs.fr.|UMR 8161 and.|the Institut Pasteur de Lille, F-59000 Lille, France.
authors.forename: Fabrice
authors.identifier: http://orcid.org/0000-0001-6312-0673
authors.initials: F
authors.lastname: Soncin
mesh_terms: D000818:Animals; D002135:Calcium-Binding Proteins; D066255:EGF Family of Proteins; D016228:Endothelial Growth Factors / Q000096:biosynthesis* / Q000235:genetics; D005786:Gene Expression Regulation; D061307:Human Umbilical Vein Endothelial Cells; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics / Q000378:metabolism; D019169:Jurkat Cells; D020935:MAP Kinase Signaling System; D051379:Mice; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex / Q000235:genetics / Q000378:metabolism; D059748:Proteolysis; D020218:Response Elements; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism; D019010:Vascular Cell Adhesion Molecule-1 / Q000235:genetics / Q000378:metabolism
chemical_list: D002135:Calcium-Binding Proteins; D066255:EGF Family of Proteins; C527877:EGFL7 protein, human; D016228:Endothelial Growth Factors; C573420:ICAM1 protein, human; D016328:NF-kappa B; D014409:Tumor Necrosis Factor-alpha; D019010:Vascular Cell Adhesion Molecule-1; D018799:Intercellular Adhesion Molecule-1; D046988:Proteasome Endopeptidase Complex
keywords: NF-kappa B (NF-KB); adhesion; endothelium; inflammation; leukocyte; vascular biology