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Kennedy Institute of Rheumatology Division, Faculty of Medicine, Imperial College of Science, Technology & Medicine, London, United Kingdom
Correspondence: Dr. Claudia Monaco, Kennedy Institute of Rheumatology Division, Faculty of Medicine, Imperial College of Science, Technology and Medicine, 1 Aspenlea Road, London W6 8LH, UK. E-mail: c.monaco{at}ic.ac.uk
Adhesion of leukocytes to the vascular endothelium is an early event in inflammation. Since cell-cell signaling may be an important stimulus for endothelial activation, we focused in this study on the role of contact-mediated activation by T lymphocytes of endothelial cells (EC). T lymphocytes were cultured with anti-CD3 monoclonal antibody or in the presence of a combination of TNF-
, interleukin (IL)-6, and IL-2, prior to fixation and coculture with human umbilical vein EC. Fixed, activated (anti-CD3- or cytokine-stimulated), but not unstimulated T cells, induced release of monocyte chemotactic protein-1, IL-8, and IL-6 by EC in a contact-dependent manner. Moreover, expression of tissue-factor antigen and activity was also significantly increased. Addition of anti-CD40 ligand antibody abolished T cell-induced activation of EC. Our data suggest that contact-mediated activation of EC by T cells, involving ligand:counter ligand interactions such as CD40:CD40 ligand, may represent a novel pathogenic mechanism of progression in inflammatory diseases such as atherosclerosis or rheumatoid arthritis.
Key Words: lymphocytes • endothelial cells • cell-cell interactions • CD40L
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