Rewiring cell adhesion

The adhesion of cells is mediated by the binding of several cell-surface receptors to ligands found in the extracellular matrix. These receptors often have overlapping specificities for the peptide ligands, making it difficult to understand the roles for discrete receptors in cell adhesion, migration, and differentiation as well as to direct the selective adhesion of cell types in tissue-engineering applications. To overcome these limitations, we developed a strategy to rewire the receptor-ligand interactions between a cell and substrate to ensure that adhesion is mediated by a single receptor with unique specificity. The strategy combines a genetic approach to engineer the cell surface with a chimeric integrin receptor having a unique ligand binding domain with a surface chemistry approach to prepare substrates that present ligands that are bound by the new binding domain. We show that Chinese hamster ovary cells that are engineered with a chimeric beta1 integrin adhere, signal, and even migrate on a synthetic matrix.