Bennett, M., Cantini, M. , Reboud, J. , Cooper, J. M. , Roca-Cusachs, P. and Salmeron-Sanchez, M. (2018) Molecular clutch drives cell response to surface viscosity. Proceedings of the National Academy of Sciences of the United States of America, 115(6), pp. 1192-1197. (doi: 10.1073/pnas.1710653115) (PMID:29358406)
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Abstract
Cell response to matrix rigidity has been explained by the mechanical properties of the actin-talin-integrin-fibronectin clutch. Here the molecular clutch model is extended to account for cell interactions with purely viscous surfaces (i.e., without an elastic component). Supported lipid bilayers present an idealized and controllable system through which to study this concept. Using lipids of different diffusion coefficients, the mobility (i.e., surface viscosity) of the presented ligands (in this case RGD) was altered by an order of magnitude. Cell size and cytoskeletal organization were proportional to viscosity. Furthermore, there was a higher number of focal adhesions and a higher phosphorylation of FAK on less-mobile (more-viscous) surfaces. Actin retrograde flow, an indicator of the force exerted on surfaces, was also seen to be faster on more mobile surfaces. This has consequential effects on downstream molecules; the mechanosensitive YAP protein localized to the nucleus more on less-mobile (more-viscous) surfaces and differentiation of myoblast cells was enhanced on higher viscosity. This behavior was explained within the framework of the molecular clutch model, with lower viscosity leading to a low force loading rate, preventing the exposure of mechanosensitive proteins, and with a higher viscosity causing a higher force loading rate exposing these sites, activating downstream pathways. Consequently, the understanding of how viscosity (regardless of matrix stiffness) influences cell response adds a further tool to engineer materials that control cell behavior.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Salmeron-Sanchez, Professor Manuel and Bennett, Mark and Cooper, Professor Jonathan and Reboud, Dr Julien and Cantini, Dr Marco |
| Authors: | Bennett, M., Cantini, M., Reboud, J., Cooper, J. M., Roca-Cusachs, P., and Salmeron-Sanchez, M. |
| College/School: | College of Science and Engineering > School of Engineering > Biomedical Engineering |
| Journal Name: | Proceedings of the National Academy of Sciences of the United States of America |
| Publisher: | National Academy of Sciences |
| ISSN: | 0027-8424 |
| ISSN (Online): | 1091-6490 |
| Published Online: | 22 January 2018 |
| Copyright Holders: | Copyright © 2018 National Academy of Sciences |
| First Published: | First published in Proceedings of the National Academy of Sciences of the United States of America 115(6):1192-1197 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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