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(American Journal of Pathology. 2001;159:1531-1539.)
© 2001 American Society for Investigative Pathology

Regular Articles

Exclusive Neutrophil Recruitment with Oncostatin M in a Human System

Steven M. Kerfoot^*, Eko Raharjo^*, May Ho^*, Jaswinder Kaur^*, Supattra Serirom^*, Donna-Marie McCafferty^*, Alan R. Burns, Kamala D. Patel^* and Paul Kubes^*

From the Department of Physiology and Biophysics,^*
Immunology Research Group, University of Calgary, Calgary, Alberta, Canada; and the Department of Medicine and Pediatrics,
Sections of Cardiovascular Sciences and Leukocyte Biology, Baylor College of Medicine, Houston, Texas

Oncostatin M (OSM), a member of the IL-6 family has been postulated to be a potent recruiter of leukocytes, however information regarding the molecular mechanism(s) underlying this event is extremely limited. Therefore, the aim of this study was to investigate the role of OSM-mediated leukocyte recruitment in a human system in vitro under flow conditions. A parallel-plate flow chamber assay was used to examine leukocyte recruitment from whole blood by human umbilical vein endothelium treated for 24 hours with OSM. OSM in a dose-response manner revealed very significant leukocyte rolling and adhesion reaching optimal levels at a very low concentration of OSM (10 ng/ml). The OSM-induced leukocyte rolling and adhesion was comparable to levels seen with tumor necrosis factor. OSM was extremely selective for neutrophil recruitment (96%) with <3% lymphocyte recruitment. By contrast, tumor necrosis factor- revealed no such selectivity, recruiting 70% neutrophils and at least 25% lymphocytes and detectable levels of eosinophils at 24 hours. The molecular mechanism underlying the leukocyte recruitment seemed to be entirely dependent on P-selectin as leukocyte recruitment could be completely blocked by the addition of a P-selectin-blocking antibody. An elevation in both P-selectin message and protein was observed with 24 hours of OSM stimulation of endothelium. By contrast, E-selectin and VCAM-1 were not detectable after OSM stimulation. Similar results were seen with passaged dermal microvascular endothelium that does not have a prestored pool of P-selectin. Based on these results, we conclude that OSM may be a very selective potent recruiter of neutrophils in more prolonged inflammatory conditions, an event exclusively dependent on P-selectin.

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