Cytoskeletal activation of NHE1 regulates mechanosensitive cell volume adaptation and proliferation
Mammalian cells rapidly respond to environmental changes by altering transmembrane water and ion fluxes, changing cell volume. Contractile forces generated by actomyosin have been proposed to mechanically regulate cell volume. However, our findings reveal a different mechanism in adherent cells, where elevated actomyosin activity increases cell volume in normal-like cells (NIH 3T3 and others) through interaction with the sodium-hydrogen exchanger isoform 1 (NHE1). This leads to a slow secondary volume increase (SVI) following the initial regulatory volume decrease during hypotonic shock. The active cell response is further confirmed by intracellular alkalinization during mechanical stretch. Moreover, cytoskeletal activation of NHE1 during SVI deforms the nucleus, causing immediate transcriptomic changes and ERK-dependent growth inhibition. Notably, SVI and its associated changes are absent in many cancer cell lines or cells on compliant substrates with reduced actomyosin activity. Thus, actomyosin acts as a sensory element rather than a force generator during adaptation to environmental challenges.
Authors
- Qin Ni (ORCID: https://orcid.org/0000-0002-0738-1817)
- Dingchang Lin (ORCID: https://orcid.org/0000-0002-9354-5952)
- Sean X. Sun (ORCID: https://orcid.org/0000-0002-9077-7088)
- Kaustav Bera (ORCID: https://orcid.org/0000-0002-0962-4368)
- Κωνσταντίνος Κωνσταντόπουλος (ORCID: https://orcid.org/0000-0003-2623-1459)
- Yizeng Li (ORCID: https://orcid.org/0000-0002-3120-727X)
- Ana Carina Nogueira Vasconcelos (ORCID: https://orcid.org/0000-0002-2544-3698)
- Gabriel Shatkin (ORCID: https://orcid.org/0000-0001-7077-1669)
- Yichen Wang (ORCID: https://orcid.org/0000-0002-0064-3968)
- Andrew P. Feinberg (ORCID: https://orcid.org/0000-0002-8364-1991)
- Yuhan Yang (ORCID: https://orcid.org/0000-0001-7314-5161)
- Zhuoxu Ge
- Yuqing Yan (ORCID: https://orcid.org/0009-0002-4436-0545)
- Yufei Wu (ORCID: https://orcid.org/0000-0002-7724-4359)
- Anindya Sen
- Jinyu Fu
Institutions
- Binghamton University (US)
- Johns Hopkins University (US)
- Johns Hopkins Medicine (US)
- Sidney Kimmel Comprehensive Cancer Center (US)
Publication Details
- Journal
- Cell Reports
- Published
- 2024-11-22
- DOI
- https://doi.org/10.1016/j.celrep.2024.114992
- Citations
- 9
- Primary Topic
- Cellular Mechanics and Interactions
- Type
- article
- Field-Weighted Citation Impact
- 2.93
Funders
- National Science Foundation
- Johns Hopkins University
- Bloomberg Philanthropies
- National Institutes of Health
- National Institute of General Medical Sciences