Abstract
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. T...Continue Reading
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