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Inflammation is a basic pathological mechanism leading to a variety of vascular diseases. The inflammatory reaction involves complex interactions between both circulating and resident leukocytes and the vascular endothelium. In this study, we report evidence for a novel action of TNF-related activation-induced cytokine (TRANCE) as an inflammatory mediator and its underlying signaling mechanism in the vascular wall. TRANCE significantly increased endothelial-leukocyte cell interactions, and this effect was associated with increased expression of the cell adhesion molecules, ICAM-1 and VCAM-1, on the endothelial cells. RT-PCR analysis and promoter assays revealed that expression of these cell adhesion molecules was transcriptionally regulated mainly by activation of the inflammatory transcription factor, NF-kappaB. TRANCE induced IkappaB-alpha phosphorylation and NF-kappaB activation via a cascade of reactions involving the TNFR-associated factors, phospholipase C, PI3K, and protein kinase C (PKC-alpha and PKC-zeta). It also led to the production of reactive oxygen species via PKC- and PI3K-dependent activation of NADPH oxidase in the endothelial cells, and antioxidants suppressed the responses to TRANCE. These results demonstrate that TRANCE has an inflammatory action and may play a role in the pathogenesis of inflammation-related diseases.

the journal of immunology/the journal of immunology

TNF-Related Activation-Induced Cytokine Enhances Leukocyte Adhesiveness: Induction of ICAM-1 and VCAM-1 via TNF Receptor-Associated Factor and Protein Kinase C-Dependent NF-κB Activation in Endothelial Cells