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Live-cell delamination counterbalances epithelial growth to limit tissue overcrowding

Eliana Marinari1, Aida Mehonic, Scott Curran

  • 1Medical Research Council Laboratory of Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK.

Nature
|April 17, 2012
PubMed

Insights

Epithelial tissue growth is balanced by a novel crowding-induced cell delamination process. This mechanism, distinct from cell death, helps maintain tissue order and may impact early cancer development.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biophysics

Background:

  • Epithelial development requires balanced growth and cell death.
  • Mechanisms controlling tissue growth and preventing deregulation (e.g., tumorigenesis) are not fully understood.
  • Proper feedback control of epithelial tissue growth is crucial for homeostasis.

Purpose of the Study:

  • To identify novel mechanisms of feedback control in epithelial tissue growth.
  • To investigate crowding-induced cell delamination as a growth-balancing process.
  • To understand the implications of cell delamination in tissue development and disease.

Main Methods:

  • Utilized the Drosophila notum as a model system.
  • Observed and analyzed crowding-induced cell delamination.
  • Employed computational modeling of epithelial mechanics.
  • Differentiated delamination from apoptosis-mediated cell extrusion.

Main Results:

  • Identified a novel process of crowding-induced cell delamination in epithelial tissues.
  • Demonstrated that delamination involves loss of cell junctions and apical area, leading to cell extrusion.
  • Showed this process is mechanistically distinct from apoptosis and precedes cell death.
  • Computational models recapitulated stochastic cell loss relieving overcrowding.

Conclusions:

  • Crowding-induced cell delamination is a key mechanism for buffering epithelia against growth variations.
  • This process ensures well-ordered cell packing during tissue development.
  • Live-cell delamination links epithelial hyperplasia to cell invasion, with implications for early cancer stages.

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