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The cadherin family of calcium-dependent cell adhesion molecules plays an important part in the organization of cell adhesion and tissue segregation during development. The expression pattern and the binding specificity of each cadherin are of principal importance for its role in morphogenesis. B-Cadherin and LCAM, two chicken cadherins, have similar, but not identical, spatial and temporal patterns of expression. To examine the possibility that they might bind to one another in a heterophilic manner, we generated, by cDNA transfection, L-cell lines that express LCAM or B-cadherin. We then examined the abilities of these cells to coaggregate with each other and with other cadherin-expressing cells in short-term aggregation assays. The B-cadherin- and the LCAM-expressing cell lines segregate from P-, N-, or R-cadherin-expressing cells. B-cadherin- and LCAM-expressing cell lines, however, appear to be completely miscible, forming large mixed aggregates. Chick B-cadherin and murine E-cadherin also form mixed aggregates, indistinguishable from homophilic aggregates. Murine E-cadherin and chick LCAM coaggregate less completely, suggesting that the heterophilic interactions of these two cell lines are weak relative to homophilic interactions. These data suggest that heterophilic interactions between B-cadherin and LCAM are important during avian morphogenesis and help identify the amino acids in the binding domain that determine cadherin specificity.

The cadherin-binding specificities of B-cadherin and LCAM.