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Journal of Cell Science, Vol 113, Issue 10 1793-1802, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
S Orsulic and R Kemler
Max-Planck-Institut fur Immunbiologie, Stubeweg 51, D-79108 Freiburg, Germany. sorsulic@nhgri.nih.gov
E-cadherin is the main cell adhesion molecule of early embryonic and adult epithelial cells. Downregulation of E-cadherin is associated with epithelial-mesenchymal transition during embryonic mesoderm formation and tumor progression. To identify genes whose expression is affected by the loss of E-cadherin, we compared mRNA expression patterns between wild-type and E-cadherin null mutant embryonic stem (ES) cells. We found that expression of several Eph receptors and ephrins is dependent on E-cadherin. Rescue of E-cadherin null ES cells with E-cadherin cDNA restores the wild-type expression pattern of Eph family members. Rescue of E-cadherin null ES cells with N-cadherin cDNA does not restore the wild-type expression pattern, indicating that the regulation of differential expression of Eph family members is specific to E-cadherin. Constitutive ectopic expression of E-cadherin in non-epithelial NIH3T3 cells results in the production of the EphA2 receptor. In epithelial cells, E-cadherin is required for EphA2 receptor localization at cell-cell contacts; in the absence of functional E-cadherin, EphA2 localizes to the perinuclear region. Our results indicate that E-cadherin may be directly or indirectly required for the membrane localization of Eph receptors and their membrane-bound ligands.
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