Protein interactions between surface annexin A2 and S100A10 mediate adhesion of breast cancer cells to microvascular endothelial cells

Abstract

Annexin A2 (AnxA2) and S100A10 are known to form a molecular complex. Using fluorescence-based binding assays, we show that both proteins are localised on the cell surface, in a molecular form that allows mutual interaction. We hypothesized that binding between these proteins could facilitate cell-cell interactions. For cells that express surface S100A10 and surface annexin A2, cell-cell interactions can be blocked by competing with the interaction between these proteins. Thus an annexin A2-S100A10 molecular bridge participates in cell-cell interactions, revealing a hitherto unexplored function of this protein interaction.

Keywords: 2′,7′-bis-(2-carboxyethyl)-5,6-carboxyfluorescein acetoxymethylester; Annexin; AnxA2; BCECF-AM; Cell–cell interaction; EGM-2; HBME cells; HMEC; HUVEC; Protein interaction; S100 protein; annexin A2; endothelial growth medium-2; human bone marrow endothelial cells; human microvascular endothelial cell; human umbilical vein endothelial cell.