Abstract
Cell-cell interactions mediated by selectins and their ligand glycans play pivotal roles in a variety of biological processes represented by leukocyte recruitment to inflammatory sites, lymphocyte homing, and extravasation of cancer cells. The interactions are enhanced at least partly through the upregulation of the selectin-ligand glycan expression, which is observed, for instance, during the activation of leukocytes or epithelial-mesenchymal transition of cancer cells. Selectin-binding assays such as cell adhesion assay or rolling assay have long been used to directly evaluate the activity of these cells in the selectin-mediated processes. In this chapter, we introduce a highly quantitative assay by flow cytometry using recombinant selectin-Ig(Fc) chimera proteins, showing our procedure and tips for E-selectin-binding assay of colon cancer cells undergoing epithelial-mesenchymal transition.
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