Abstract
Stem Cell Extracellular Matrix Interactions in Three- Dimensional System via Integrins Cells of all types interact with the extracellular matrix (ECM) through integrin-mediated interactions. Adhesion of embryonic stem (ES) cells is necessary for differentiation. We have characterized integrin expression of undifferentiated mES cells and established a system of evaluating the ECM-integrin interactions in three-dimension (3D) using electrospun scaffolds. We observed a higher proliferation rate at early time points in conventional 2D culture with various ECM proteins (collagen IV, laminin, fibronectin, vitronectin) as compared to 3D conditions. At later time points, we observed higher proliferations in 3D culture conditions compared to 2D culture conditions. We also detected the importance of α5, αV, β1, β5 and αVβ5 integrin subunits for cellular adhesion in 3D conditions using a cellular adhesion assay.
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