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Journal of Leukocyte Biology, Vol 58, Issue 1 71-79, Copyright © 1995 by Society for Leukocyte Biology


JOURNAL ARTICLE

IL-1 activation of endothelium supports VLA-4 (CD49d/CD29)-mediated monocyte transendothelial migration to C5a, MIP-1 alpha, RANTES, and PAF but inhibits migration to MCP-1: a regulatory role for endothelium-derived MCP-1

HE Chuluyan, TJ Schall, T Yoshimura and AC Issekutz
Department of Pediatrics, Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada.

We investigated the effect of interleukin-1 (IL-1) activation of human umbilical vein endothelium (HUVE) on human monocyte transendothelial migration induced by chemotactic factors. Monocyte migration across unactivated endothelium in response to macrophage inflammatory protein-1 alpha (MIP-1 alpha), RANTES, platelet-activating factor (PAF), or monocyte chemoattractant protein-1 (MCP-1) was completely inhibited (90%) by monoclonal antibodies (mAbs; 60.3) to CD18 of the CD11/CD18 complex on the monocyte and partially inhibited (by 75%) in response to C5a. When the HUVE was stimulated with IL-1 alpha (5 h, 0.1 ng/ml), monocyte migration in response to C5a, MIP-1 alpha, RANTES, or PAF was no longer inhibited by mAb to CD18. However, migration was blocked by the combination of mAb to the alpha 4-integrin (CD49d) chain of very late antigen-4 (CD49d/CD29) with the mAb to CD18. In contrast to the above stimuli, activation of the HUVE with IL-1 alpha inhibited the transendothelial migration of monocytes in response to MCP-1. mAbs to the adhesion molecules up-regulated on HUVE by IL-1, i.e., E-selectin (CD62E), intercellular adhesion molecule-1 (CD54) or vascular cell adhesion molecule-1 (CD106), did not reverse the inhibitory effect. Transendothelial migration in response to MCP-1 but not to C5a was inhibited by the treatment of monocytes with culture supernatant from IL-1 alpha-stimulated (but not from unstimulated) HUVE. Such supernatant contained chemotactic activity for monocytes, and a mAb to MCP-1 blocked the migration inhibitory effect of IL-1 activation of the HUVE monolayer, as well as the chemotactic activity in the supernatant from IL-1-stimulated HUVE. The inhibitory effect on migration of IL-1-stimulated HUVE was specific for monocytes because polymorphonuclear leukocyte transendothelial migration in response to IL-8 (a related chemokine) was not inhibited by IL-1 activation of HUVE.(ABSTRACT TRUNCATED AT 250 WORDS)


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