MRTF transcription and Ezrin-dependent plasma membrane blebbing are required for entotic invasion
Open accessAbstract
Entosis is a nonapoptotic form of cell death initiated by actomyosin-dependent homotypic cell-in-cell invasion that can be observed in malignant exudates during tumor progression. We previously demonstrated formin-mediated actin dynamics at the rear of the invading cell as well as nonapoptotic plasma membrane (PM) blebbing in this cellular motile process. Although the contractile actin cortex involved in bleb-driven motility is well characterized, a role for transcriptional regulation in this process has not been studied. Here, we explore the impact of the actin-controlled MRTF–SRF (myocardin-related transcription factor–serum response factor) pathway for sustained PM blebbing and entotic invasion. We find that cortical blebbing is tightly coupled to MRTF nuclear shuttling to promote the SRF transcriptional activity required for entosis. Furthermore, PM blebbing triggered SRF-mediated up-regulation of the metastasis-associated ERM protein Ezrin. Notably, Ezrin is sufficient and important to sustain bleb dynamics for cell-in-cell invasion when SRF is suppressed. Our results highlight the critical role of the actin-regulated MRTF transcriptional pathway for bleb-associated invasive motility, such as during entosis.
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Actin drives entosis by promoting pro-invasive cortical plasma membrane blebbing upon activation of MRTF and SRF culminating with EZR upregulation.
“Actin drives entosis by promoting pro-invasive (non-apoptotic) cortical plasma membrane blebbing upon activation of a signaling pathway that involves myocardin-related transcription factor (MRTF) and serum response factor (SRF) culminating with ezrin (EZR) upregulation [702].”
From Molecular mechanisms of cell death: recommendations of the nomenclature committee on cell death 2018. (2018) · cites this paper as [702]
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- Authors
- Hinojosa, L. S., Holst, M., Baarlink, C., & Grosse, R.
- Affiliations
- Philipps University of Marburg (DE)
- Corresponding author
- Grosse, Robert
- Venue
- Journal of Cell Biology
- Publisher
- Rockefeller University Press
- Published
- 2017-08-03
- Volume
- 216
- Issue
- 10
- Pages
- 3087-3095
- ISSN
- 0021-9525 (ISSN-L)
- 1540-8140
- PMC
- PMC5626544
- OpenAlex
- W2745157077
- Cited by
- 41
- References
- 33
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 5 · 2023: 2 · 2022: 6 · 2021: 7 · 2020: 4 · 2019: 4 · 2018: 5 · 2017: 1
- FWCI
- 2.04
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion, cc-by-nc-sa)
- PubMed (publishedVersion)
- Funders
- Deutsche Forschungsgemeinschaft (GRK 2213)
- Deutsche Krebshilfe (110405)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Keywords
- entosis, membrane blebbing, ezrin, actomyosin contractility, actin cortex, non-apoptotic cell death, nuclear shuttling, transcriptional regulation, tumor progression
- MeSH terms
- Ezrin, Cytoskeletal Proteins, Humans, Transcription, Genetic, Trans-Activators, Up-Regulation, Cell Membrane Structures, Serum Response Factor, Cell Line, Tumor, Entosis
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