Link to bioRxiv paper:
http://biorxiv.org/cgi/content/short/2022.11.15.516693v1?rss=1

Authors: Mochizuki, T., Tanigawa, T., Shindo, S., Suematsu, M., Oguchi, Y., Mioka, T., Kato, Y., Fujiyama, M., Hatano, E., Yamaguchi, M., Chibana, H., Abe, F.

Abstract:
The fungal cell wall is the first barrier against diverse external stresses, such as high hydrostatic pressure. This study explores the roles of osmoregulation and the cell wall integrity (CWI) pathway in response to the high pressure in the yeast Saccharomyces cerevisiae. We demonstrate the roles of the transmembrane mechanosensor Wsc1 and aquaglyceroporin Fps1 in an underlying protective mechanism to avoid cellular rupture under high pressure. The promotion of water influx into cells at 25 MPa, as evident by an increase in cell volume and a loss of the plasma membrane eisosome structure, promotes the activation of Wsc1, an activator of the CWI pathway. The downstream mitogen-activated protein kinase Slt2 was hyperphosphorylated at 25 MPa. Glycerol efflux increases via Fps1 phosphorylation, which is initiated by downstream components of the CWI pathway, and contributes to the reduction in intracellular osmolarity under high pressure. Herein, the elucidation of a cellular pathway that is used as a protective mechanism against high pressure could potentially be translated to mammalian cells and could help to understand cellular mechanosensation and adaptation.

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