Caveolae couple mechanical stress to integrin recycling and activation
Abstract
Cells are subjected to multiple mechanical inputs throughout their lives. Their ability to detect these environmental cues is called mechanosensing, a process in which integrins play an important role. During cellular mechanosensing, plasma membrane (PM) tension is adjusted to mechanical stress through the buffering action of caveolae; however, little is known about the role of caveolae in early integrin mechanosensing regulation. Here, we show that Cav1KO fibroblasts increase adhesion to FN-coated beads when pulled with magnetic tweezers, as compared to wild type fibroblasts. This phenotype is Rho-independent and mainly derived from increased active b1-integrin content on the surface of Cav1KO fibroblasts. FRAP analysis and endocytosis/recycling assays revealed that active b1-integrin is mostly endocytosed through the CLIC/GEEC pathway and is more rapidly recycled to the PM in Cav1KO fibroblasts, in a Rab4 and PM tension-dependent manner. Moreover, the threshold for PM tension-driven b1-integrin activation is lower in Cav1KO MEFs than in wild type MEFs, through a mechanism dependent on talin activity. Our findings suggest that caveolae couple mechanical stress to integrin cycling and activation, thereby regulating the early steps of the cellular mechanosensing response.
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Article and author information
Author details
Funding
European Union Horizon 2020 Research and Innovation Programme (Marie Sklodowska-Curie grant 641639)
- Miguel Ángel del Pozo
Spanish Ministry of Economy, Industry and Competitiveness (SAF2011-25047,SAF2014-51876-R,SAF2017-83130-R,MINSEV1512-07-2016,CSD2009-0016)
- Miguel Ángel del Pozo
Worldwide Cancer Research Foundation (#15 -0404)
- Miguel Ángel del Pozo
Asociación Española Contra el Cáncer Foundation (PROYE20089DELP)
- Miguel Ángel del Pozo
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Reviewing Editor
- Suzanne R Pfeffer, Stanford University, United States
Version history
- Preprint posted: April 29, 2022 (view preprint)
- Received: August 2, 2022
- Accepted: October 19, 2022
- Accepted Manuscript published: October 20, 2022 (version 1)
- Accepted Manuscript updated: October 21, 2022 (version 2)
- Version of Record published: December 13, 2022 (version 3)
- Version of Record updated: November 20, 2023 (version 4)
Copyright
© 2022, Lolo et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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