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The Journal of Cell Biology, Vol 121, 449-459, Copyright © 1993 by The Rockefeller University Press


ARTICLES

Identification of a glycoprotein ligand for E-selectin on mouse myeloid cells

A Levinovitz, J Muhlhoff, S Isenmann and D Vestweber
Hans Spemann Laboratory, Max-Planck-Institute of Immunology, Freiburg, FRG.

E-selectin is an inducible endothelial cell adhesion molecule for neutrophils which functions as a Ca(2+)-dependent lectin. Using a recombinant, antibody-like form of mouse E-selectin, we have searched for glycoprotein ligands on mouse neutrophils and the neutrophil progenitor cell line 32D cl 3. We have identified a 150-kD glycoprotein as the only protein which could be affinity-isolated with soluble E- selectin from [35S]methionine/[35S]cysteine-labeled 32D cl 3 cells. Binding of this protein was strictly Ca(2+)-dependent, was blocked by a cell adhesion-blocking mAb against mouse E-selectin, and required the presence of sialic acid on the 150-kD ligand. This glycoprotein was also affinity-isolated from mature neutrophils, in addition to a minor component at 250 kD, but could not be isolated from several other non- myeloid cell lines. The 150-kD glycoprotein was the only protein from 32D cl 3 cells, which was detectable by silver-staining after a one- step affinity-isolation.
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