期刊
NATURE MATERIALS
卷 16, 期 12, 页码 1262-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT5023
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资金
- European Research Council [322652]
- Deutsche Forschungsgemeinschaft [SFB865-B3]
- Swiss National Science Foundation [31003A_138063]
- European Research Council (ERC) [322652] Funding Source: European Research Council (ERC)
- Swiss National Science Foundation (SNF) [31003A_138063] Funding Source: Swiss National Science Foundation (SNF)
Integrin-mediated mechanosensing of the extracellular environment allows cells to control adhesion and signalling. Whether cells sense and respond to force immediately upon ligand-binding is unknown. Here, we report that during adhesion initiation, fibroblasts respond to mechanical load by strengthening integrin-mediated adhesion to fibronectin (FN) in a biphasic manner. In the first phase, which depends on talin and kindlin as well as on the actin nucleators Arp2/3 and mDia, FN-engaged alpha 5 beta 1 integrins activate focal adhesion kinase (FAK) and c-Src in less than 0.5 s to steeply strengthen alpha 5 beta 1- and alpha V-class integrin-mediated adhesion. When the mechanical load exceeds a certain threshold, fibroblasts decrease adhesion and initiate the second phase, which is characterized by less steep adhesion strengthening. This unique, biphasic cellular adhesion response is mediated by alpha 5 beta 1 integrins, which form catch bonds with FN and signal to FN-binding integrins to reinforce cell adhesion much before visible adhesion clusters are formed.
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