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Passive coupling of membrane tension and cell volume during active response of cells to osmosis

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Kim,  Kyoohyun
Guck Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Urbanska,  Marta
Guck Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Guck,  Jochen
Guck Division, Max Planck Institute for the Science of Light, Max Planck Society;
Max-Planck-Zentrum für Physik und Medizin, Max Planck Institute for the Science of Light, Max Planck Society;

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Proc Natl Acad Sci USA 2021 Roffay.pdf
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Citation

Roffay, C., Molinard, G., Kim, K., Urbanska, M., Andrade, V., Barbarasa, V., et al. (2021). Passive coupling of membrane tension and cell volume during active response of cells to osmosis. Proceedings of the National Academy of Sciences of the United States of America, 118(47): e2103228118. doi:10.1073/pnas.2103228118.


Cite as: https://hdl.handle.net/21.11116/0000-0009-84D2-4
Abstract
During osmotic changes of their environment, cells actively regulate their volume and plasma membrane tension that can passively change through osmosis. How tension and volume are coupled during osmotic adaptation remains unknown, as their quantitative characterization is lacking. Here, we performed dynamic membrane tension and cell volume measurements during osmotic shocks. During the first few seconds following the shock, cell volume varied to equilibrate osmotic pressures inside and outside the cell, and membrane tension dynamically followed these changes. A theoretical model based on the passive, reversible unfolding of the membrane as it detaches from the actin cortex during volume increase quantitatively describes our data. After the initial response, tension and volume recovered from hypoosmotic shocks but not from hyperosmotic shocks. Using a fluorescent membrane tension probe (fluorescent lipid tension reporter [Flipper-TR]), we investigated the coupling between tension and volume during these asymmetric recoveries. Caveolae depletion and pharmacological inhibition of ion transporters and channels, mTORCs, and the cytoskeleton all affected tension and volume responses. Treatments targeting mTORC2 and specific downstream effectors caused identical changes to both tension and volume responses, their coupling remaining the same. This supports that the coupling of tension and volume responses to osmotic shocks is primarily regulated by mTORC2.