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From the Vascular Medicine and Atherosclerosis Unit,*
Cardiovascular Division, Department of Medicine, Brigham and Women's
Hospital, Harvard Medical School, Boston, Massachusetts, and Geneva
Biomedical Research Institute,
Geneva, Switzerland
Neovascularization frequently accompanies chronic immune responses
characterized by T cell infiltration and activation. Angiogenesis
requires endothelial cells (ECs) to penetrate extracellular
matrix, a process that involves matrix metalloproteinases
(MMPs). We report here that activated human T cells mediate
contact-dependent expression of MMPs in ECs through CD40/CD40 ligand
signaling. Ligation of CD40 on ECs induced de novo
expression of gelatinase B (MMP-9), increased interstitial
collagenase (MMP-1) and stromelysin (MMP-3), and activated
gelatinase A (MMP-2). Recombinant human CD40L induced expression of
MMPs by human vascular ECs to a greater extent than did maximally
effective concentrations of interleukin-1ß or tumor necrosis
factor-
. Moreover, activation of human vascular ECs through
CD40 induced tube formation in a three-dimensional fibrin matrix gel
assay, an effect antagonized by a MMP inhibitor. These results
demonstrated that activation of ECs by interaction with T cells induced
synthesis and release of MMPs and promoted an angiogenic function of
ECs via CD40L-CD40 signaling. As vascular cells at the sites of chronic
inflammation, such as atherosclerotic plaques, express
CD40 and its ligand, our findings suggest that ligation of CD40
on ECs can mediate aspects of vascular remodeling and neovessel
formation during atherogenesis and other chronic immune
reactions.
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