Abstract
Recent evidence suggests that adhesion molecules play important roles in eosinophil functions such as degranulation and superoxide anion production. CD11b/CD18 (Mac-1) and CD49d/CD29 (VLA-4) are involved in eosinophil-endothelial adhesion through their counterligands, intercellular adhesion molecule-1 (ICAM-1; CD54) and vascular cell adhesion molecule-1 (VCAM-1), respectively. CD54 is also induced on eosinophils by cytokine stimulation. We hypothesized that CD54 on human eosinophils may participate in eosinophil degranulation. CD54 was induced on eosinophils by a combination of human recombinant granulocyte-macrophage colony-stimulating factor (rGM-CSF) and human recombinant tumour necrosis factor-alpha (rTNF-alpha) within 2 hr of incubation, as determined by flow cytometric analysis. Recombinant GM-CSF alone induced a slight but significant CD54 expression on eosinophils. Release of eosinophil protein X, an indicator of eosinophil degranulation, was induced by rGM-CSF and this effect was synergistically enhanced by adding rTNF-alpha. To determine the role of newly expressed CD54 in eosinophil degranulation, a blocking assay was performed using monoclonal antibody (mAb) against CD54 and CD18. Anti-CD18 mAb and anti-CD54 mAb markedly inhibited eosinophil degranulation induced by rGM-CSF or a combination of rGM-CSF and rTNF-alpha. On the other hand, anti-CD54 mAb had little effect on rGM-CSF- or rGM-CSF/rTNF-alpha-induced adhesion of eosinophils, whereas anti-CD18 mAb significantly inhibited eosinophil adhesion. These results indicate that CD54 on eosinophils plays an important role in the eosinophil degranulation and that eosinophils are capable of interacting with other beta 2 integrin-positive cells.
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