Cited by 41Cellular Mechanics and InteractionsCell death mechanisms and regulationProtein Kinase Regulation and GTPase Signaling

MRTF transcription and Ezrin-dependent plasma membrane blebbing are required for entotic invasion

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Hinojosa, Laura Soto, Holst, Manuel, Baarlink, Christian, Grosse, Robert·2017·Journal of Cell Biology

Abstract

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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Crossref · 10.1083/jcb.201702010

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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].”

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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
Published
2017-08-03
Volume
216
Issue
10
Pages
3087-3095
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
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
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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