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Matrix mechanics and water permeation regulate extracellular vesicle transport
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Matrix mechanics and water permeation regulate extracellular vesicle transport
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Journal Article
Matrix mechanics and water permeation regulate extracellular vesicle transport
2020
Overview
Cells release extracellular vesicles (EVs) to communicate over long distances, which requires EVs to traverse the extracellular matrix (ECM). However, given that the size of EVs is usually larger than the mesh size of the ECM, it is not clear how they can travel through the dense ECM. Here we show that, in contrast to synthetic nanoparticles, EVs readily transport through nanoporous ECM. Using engineered hydrogels, we demonstrate that the mechanical properties of the matrix regulate anomalous EV transport under confinement. Matrix stress relaxation allows EVs to overcome the confinement, and a higher crosslinking density facilitates a fluctuating transport motion through the polymer mesh, which leads to free diffusion and fast transport. Furthermore, water permeation through aquaporin-1 mediates the EV deformability, which further supports EV transport in hydrogels and a decellularized matrix. Our results provide evidence for the nature of EV transport within confined environments and demonstrate an unexpected dependence on matrix mechanics and water permeation.Stress relaxation properties of the matrix as well as water transport through aquaporin-1 enable extracellular vesicles to deform and travel through the dense mesh of the extracellular matrix between cells.
