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Cellular forces and matrix assembly coordinate fibrous tissue repair
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Journal Article
Cellular forces and matrix assembly coordinate fibrous tissue repair
2016
Overview
Planar
in vitro
models have been invaluable tools to identify the mechanical basis of wound closure. Although these models may recapitulate closure dynamics of epithelial cell sheets, they fail to capture how a wounded fibrous tissue rebuilds its 3D architecture. Here we develop a 3D biomimetic model for soft tissue repair and demonstrate that fibroblasts ensconced in a collagen matrix rapidly close microsurgically induced defects within 24 h. Traction force microscopy and time-lapse imaging reveal that closure of gaps begins with contractility-mediated whole-tissue deformations. Subsequently, tangentially migrating fibroblasts along the wound edge tow and assemble a progressively thickening fibronectin template inside the gap that provide the substrate for cells to complete closure. Unlike previously reported mechanisms based on lamellipodial protrusions and purse-string contraction, our data reveal a mode of stromal closure in which coordination of tissue-scale deformations, matrix assembly and cell migration act together to restore 3D tissue architecture.
Planar
in vitro
models for wound closure stress the role of lamellipodial protrusions and purse-string contraction. Here the authors develop a 3D biomimetic model for tissue repair and show a mode of stromal closure that relies on whole tissue deformations, cell migration and matrix deposition.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
