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The Journal of Immunology, Vol 155, Issue 4 2194-2202, Copyright © 1995 by American Association of Immunologists
ARTICLES |
M Nagata, JB Sedgwick, ME Bates, H Kita and WW Busse
Department of Medicine, University of Wisconsin, Madison 53792, USA.
Adhesion to the adhesion protein, VCAM-1, on vascular endothelium is proposed to be an important factor in the selective accumulation of eosinophils at sites of allergic inflammation. To determine whether eosinophil adhesion to VCAM-1 is also associated with an alteration of eosinophil function, human peripheral blood eosinophils were isolated from allergic donors and incubated in VCAM-1-coated wells. Spontaneous adherence of isolated eosinophils to VCAM-1-coated wells was greater than cells incubated in FCS-treated control wells (38.0 +/- 1.6% vs 17.1 +/- 1.9%, n = 16, p < 0.0001). In addition, eosinophils incubated in VCAM-1-coated wells spontaneously generated modest but significant amounts of superoxide anion (O2-; 2.0 +/- 1.3 vs 00.5 +/- 0.5 nmol/5 x 10(5) cells, n = 9, p = 0.029). Moreover, when 100 nM FMLP was added to eosinophils in the presence of VCAM-1, significantly greater O2- generation occurred (7.2 +/- 0.9 vs 5.4 +/- 1.0 (FCS control) nmol/5 x 10(5) cells, n = 9, p = 0.009). Adhesion, as well as the spontaneous and enhanced O2- generation to FMLP activation, was blocked by the monoclonal anti-alpha 4 integrin Ab, HP 1/2, implying involvement of an alpha 4 integrin-VCAM-1 interaction. In contrast, the anti-CD18 mAb, L130, inhibited the spontaneous and enhanced O2- generation to FMLP without affecting adhesion, suggesting an involvement of CD18 molecule(s) only in VCAM-1-enhanced respiratory burst. Finally, 1 microM genistein, a tyrosine kinase inhibitor suppressed the VCAM-1- enhancing effect on eosinophil O2- generation and VCAM-1-induced tyrosine phosphorylation, suggesting a role for tyrosine phosphorylation in this eosinophil functional up-regulation. Our observations suggest that eosinophil adhesion to VCAM-1 may be an important step in determining the eventual functional activity of these cells as they migrate from the circulation to the airways and contribute to the allergic inflammatory process.
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