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Journal of Cell Science, Vol 112, Issue 12 1937-1945, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
G Cepinskas, M Sandig and PR Kvietys
Vascular Biology Program, London Health Sciences Centre, Research Inc., London, Ontario, Canada N6A 4G5.
One of the cardinal signs of acute inflammation is neutrophil (PMN) emigration across the endothelium and into the affected tissue. We have previously shown that human PMN migration across human umbilical vein endothelial cell (HUVEC) monolayers is dependent on PMN-derived elastase. However, whether migrating PMN release elastase into the extracellular milieu or retain it on the cell surface is unclear. In the present study, we show that when PMN are activated by platelet activating factor (PAF), elastase was mobilized to and retained in the cell membrane; no elastase activity was detected in the supernatant. Neutroplasts (enucleated cells devoid of granules) prepared from PAF-activated PMN contained twice as much elastase as did neutroplasts prepared from unstimulated PMN. Neutroplasts from PAF-activated PMN migrated across HUVEC monolayers in response to a chemotactic gradient (PAF), while those prepared from unstimulated PMN did not. The neutroplast transendothelial migration was inhibited (80%) by a monoclonal antibody against elastase. Using confocal microscopy, we noted that the localization of elastase on the cell surface of PMN, which were adherent to HUVEC but not migrating, was largely confined to the apical aspect of the PMN. There was little or no elastase detectable on the basal aspect of the PMN membrane in contact with the endothelium. By contrast, in migrating PMN the membrane-bound elastase was primarily localized to the migrating front, i.e. pseudopodia penetrating the HUVEC monolayers. Taken together, our findings indicate that migrating PMN localize their membrane-bound elastase to the migrating front where it facilitates transendothelial migration.
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