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The Journal of Immunology, Vol 149, Issue 4 1340-1347, Copyright © 1992 by American Association of Immunologists
ARTICLES |
JF Bohnsack and XN Zhou
Department of Pediatrics and Pathology, University of Utah School of Medicine, Salt Lake City 84132.
We investigated the mechanisms by which Mn2+ alters human neutrophil (PMN) adherence to various connective tissue proteins. Substitution of Mn2+ for Ca2+ and Mg2+ significantly increased adhesion of human PMN to plastic well coated with fibronectin, fibrinogen, and laminin but not gelatin. Anti-CD18 mAb almost completely blocked adherence to laminin, partly blocked adherence to fibrinogen, but did not inhibit adhesion to fibronectin at all. In contrast, anti-very late antigen (VLA)-5 mAb antibodies significantly reduced Mn(2+)-mediated PMN adherence to fibronectin, but not to laminin or fibrinogen, demonstrating that VLA-5- mediated PMN adherence to fibronectin, but not to fibrinogen or laminin. This was supported by experiments in which synthetic GRGDSP peptide significantly inhibited Mn(2+)-mediated adherence to fibronectin, but not to laminin or fibrinogen. Activation of PMN with phorbol ester or C5a stimulated VLA-5-mediated adhesion to fibronectin, but the contribution of VLA-5 to the forces mediating adherence could only be detected when CD18 function was either blocked with mAb, or when CD18 was congenitally absent. VLA-5 mediated adhesion was also more transient than CD18-dependent adhesion. These data further confirm the presence of PMN VLA integrins and demonstrate that PMN VLA-5 contributes to stimulated PMN adherence to fibronectin.
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