Abstract:
:To measure the adhesion of cells expressing the neural cell adhesion molecule N-CAM, mouse Lmtk- fibroblast cells were transfected by a calcium phosphate precipitation technique with eucaryotic expression vectors encoding N-CAM polypeptides. We obtained cell lines expressing the 140-kDa transmembrane isoform of N-CAM at high levels by several rounds of selection by fluorescence-activated cell sorting and compared the adhesion of these cells to that of untransfected cells using a centrifugal removal assay that measures the centrifugal force required to remove radiolabeled probe cells from a cell monolayer. The adhesion of cells prepared from embryonic chicken neural retinas also was examined. Retinal probe cells remained associated with a retinal cell monolayer with an adhesive force of approximately 5 x 10(-6) dyn/cell, and this force was not reduced by treatment with specific anti-N-CAM antibody fragments. Transfected and untransfected mouse L cells each were dislodged from transfected cell monolayers with a removal force of 5 x 10(-5) dyn/cell and thus did not differ in their adhesion. These results support the hypothesis that N-CAM-mediated homophilic adhesion in retinal cells and transfected fibroblasts is relatively weak and that the major adhesive interaction involved in N-CAM-mediated cell-cell adhesion is heterophilic.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Woo MK,Murray BAdoi
10.1006/excr.1993.1041subject
Has Abstractpub_date
1993-02-01 00:00:00pages
336-45issue
2eissn
0014-4827issn
1090-2422pii
S0014-4827(83)71041-4journal_volume
204pub_type
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