PubMed:10228026 JSONTXT

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p65 homodimer binding to downstream NF-kappa B site of the promoter mediates endothelial ICAM-1 expression and neutrophil adhesion.\nWe investigated the mechanisms by which proinflammatory mediator, thrombin, released during intravascular coagulation and tissue injury, induces ICAM-1 (CD54) expression in endothelial cells. Stimulation of HUVEC with thrombin resulted in dose- and time-dependent increases in ICAM-1 mRNA and cell surface expression and in ICAM-1-dependent endothelial adhesivity toward polymorphonuclear leukocytes. Transient transfection of endothelial cells with ICAM-1 promoter luciferase reporter gene (ICAM-1LUC) constructs indicated that deletion of upstream NF-kappa B site (-533 bases from translation start site) had no effect on thrombin responsiveness, whereas mutation/deletion of downstream NF-kappa B site (-223 bases from the translation start site) prevented the activation of ICAM-1 promoter, indicating that the downstream NF-kappa B site is critical for thrombin inducibility. NF-kappa B-directed luciferase activity increased approximately 3-fold when cells transfected with the plasmid pNF-kappa BLUC containing five copies of consensus NF-kappa B site linked to a minimal adenovirus E1B promoter-luciferase gene were exposed to thrombin, indicating that activation of NF-kappa B was essential for thrombin response. Gel supershift assays demonstrated that thrombin induced binding of NF-kappa Bp65 (Rel A) to downstream NF-kappa B site of the ICAM-1 promoter. Thrombin receptor activation peptide, a 14-amino-acid peptide representing the new NH2 terminus of proteolytically activated receptor-1, mimicked thrombin's action in inducing ICAM-1 expression. These data indicate that thrombin activates endothelial ICAM-1 expression and polymorphonuclear leukocyte adhesion by NF-kappa Bp65 binding to the downstream NF-kappa B site of ICAM-1 promoter after proteolytically activated receptor-1 activation."}

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