Heterotypic cell adhesion assay for the study of cell adhesion inhibition.

CD2 is a cell adhesion molecule that mediates T-cell activation by binding to its ligand CD58 on antigen-presenting cells. Interaction between CD2 and CD58 or leukocyte function-associated antigen-3 (LFA-3) helps to optimize immune recognition facilitating contact between T lymphocytes and antigen-presenting cells. Modulation or inhibition of this interaction has been shown to be therapeutically useful in the treatment of autoimmune diseases. Antibodies and small molecules including peptides have been designed to modulate or disrupt the cell adhesion interactions due to CD2 and CD58. E-rosetting assay is a widely used method applied in the study of the modulation of CD2-CD58 interaction, which is either labor-intensive or radio-hazardous. In this chapter, we describe two methods that are used to study cell adhesion inhibition: (a) E-rosetting Assay and (b) Lymphocyte-epithelial assay. The second method, lymphocyte-epithelial assay, is a rapid and sensitive heterotypic cell adhesion assay for studying cell adhesion inhibition. The method relies on the CD2 expression on the surface of Jurkat cells and the CD58 expression on the surface of Caco-2 cells, which were confirmed by flow cytometry and ELISA studies respectively. This heterotypic cell adhesion assay described typically takes less than 4 h to perform, allows the evaluation of inhibitory activity of peptides/small molecules to modulate CD2-CD58 interaction in real cell system.