Abstract
At sites of inflammation, interactions between monocytes and vascular endothelium play an important role in the margination and extravasation of monocytes. The aim of this study was to investigate the relative contributions of the CD11/CD18 family of leucocyte adhesion molecules on monocytes and ICAM-1 and ELAM-1 molecules on endothelial cells (EC) to the binding of monocytes to EC stimulated with recombinant interleukin-1 alpha (rIL-1 alpha), rIL-6, recombinant tumour necrosis factor-alpha (rTFN-alpha) or recombinant interferon-gamma (rIFN-gamma). The adhesiveness of EC for monocytes increased 1.8-2.3-fold after incubation of monolayers of venous or arterial EC with rIL-1 alpha or rTNF-alpha for 4 hr, and 1.6-2.0-fold after stimulation of both types of EC with rIL-1 alpha, rTNF-alpha or rIFN-gamma for 24 hr. Incubation with rIL-6 was without effect. The monoclonal antibodies (mAb) against CD11a, b, c and CD18 on monocytes did not inhibit the increase in the number of monocytes bound to rIL-1 alpha-, rTNF-alpha-, or rIFN-gamma-stimulated EC. However, mAb against ELAM-1 expressed on the surface of 4 hr rIL-1 alpha-stimulated EC slightly inhibited (15-21%) the enhanced monocyte binding. ICAM-1, which exhibited marked expression on 24 hr rIL-1 alpha-, rTNF-alpha- or rIFN-gamma-stimulated EC, did not contribute to the enhanced monocyte binding. The percentage of EC-bound monocytes which had stretched out over the surface of cytokine-stimulated venous or arterial EC was significantly increased compared to the percentage found for non-stimulated EC. It was observed that mild fixation of EC as well as treatment of EC with cytochalasin B or mAb against ICAM-1 did not affect the number of monocytes that were bound to EC, but considerably reduced the percentage of EC-bound monocytes with a stretched morphology. It is concluded that the binding of monocytes to cytokine-stimulated EC is dependent on the type of cytokine and the duration of cytokine stimulation. The increase in the binding of monocytes to cytokine-stimulated EC occurred as a result of CD11/CD18- and ICAM-1-independent factors. The subsequent morphological changes, i.e. stretching of monocytes over the surface of EC, required viable EC and ICAM-1.
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