Probing cellular mechanobiology in three-dimensional culture with collagen-agarose matrices

Biomaterials
Theresa A UlrichSanjay Kumar

Abstract

The study of how cell behavior is controlled by the biophysical properties of the extracellular matrix (ECM) is limited in part by the lack of three-dimensional (3D) scaffolds that combine the biofunctionality of native ECM proteins with the tunability of synthetic materials. Here, we introduce a biomaterial platform in which the biophysical properties of collagen I are progressively altered by adding agarose. We find that agarose increases the elasticity of 3D collagen ECMs over two orders of magnitude with modest effect on collagen fiber organization. Surprisingly, increasing the agarose content slows and eventually stops invasion of glioma cells in a 3D spheroid model. Electron microscopy reveals that agarose forms a dense meshwork between the collagen fibers, which we postulate slows invasion by structurally coupling and reinforcing the collagen fibers and introducing steric barriers to motility. This is supported by time lapse imaging of individual glioma cells and multicellular spheroids, which shows that addition of agarose promotes amoeboid motility and restricts cell-mediated remodeling of individual collagen fibers. Our results are consistent with a model in which agarose shifts ECM dissipation of cell-induced stresse...Continue Reading

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