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Variability in the expression of urokinase receptor (CD87) mutants on cells: relevance to cell adhesion
Author(s) -
Kanse Sandip M.,
Chavakis Triantafyllos,
Kuo Alice,
Bdeir Khalil,
Cines Douglas B.,
Preissner Klaus T.
Publication year - 2004
Publication title -
cell biochemistry and function
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.933
H-Index - 61
eISSN - 1099-0844
pISSN - 0263-6484
DOI - 10.1002/cbf.1098
Subject(s) - urokinase receptor , vitronectin , cell adhesion , microbiology and biotechnology , receptor , integrin , transfection , fibronectin , mutant , extracellular matrix , chemistry , biology , cell , cell culture , biochemistry , genetics , gene
The urokinase‐type plasminogen activator receptor (uPAR, CD87) is a glycosylphosphatidylinositol (GPI)‐anchored protein, containing three homologous Ly‐6 domains, that mediates integrin‐independent cell adhesion by directly binding to extracellular matrix protein vitronectin (VN). To elucidate the structural requirements for the uPAR‐dependent cell adhesion on VN, several glycolipid‐anchored variants of uPAR were expressed in BAF3 cells, (mouse pre B‐lymphocytes) followed by functional analysis. The individual domains of uPAR were expressed at very low levels, the two domain mutants were expressed to a higher level and the wild type uPAR was expressed highly. Point mutations in domain 2 of uPAR have been shown to diminish cellular binding of the ligand urokinase and we observed a lack of VN binding to this mutant. Flow cytometry with a number of monoclonal antibodies indicated that the domain‐specific antigenic determinants in these mutants were well preserved. Only the cells expressing the intact uPAR with all three domains adhered strongly to a VN substrate, whereas none of the other transfected cells showed significant cell adhesion. Hence, any alterations in the domain structure of uPAR reduce its expression and only the intact receptor can sustain the direct cell adhesion on VN‐rich matrices found at sites of inflammation and injury. Copyright © 2004 John Wiley & Sons, Ltd.