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Related Concept Videos

Cell Polarization by Rho Proteins01:21

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Related Experiment Video

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Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos
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ROCK1 and ROCK2 regulate epithelial polarisation and geometric cell shape.

Ruba Kalaji1, Ann P Wheeler, Jennifer C Erasmus

  • 1Faculty of Medicine, Molecular Medicine Section, National Heart and Lung Institute, Imperial College of London, London, UK.

Biology of the Cell
|April 3, 2012
PubMed
Summary
This summary is machine-generated.

ROCK proteins regulate myosin II contraction, influencing epithelial cell shape and polarity during differentiation. This study clarifies their role in cell elongation and geometric shape acquisition.

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Area of Science:

  • Cell Biology
  • Epithelial Biology
  • Biophysics

Background:

  • Cell-cell adhesion and contraction are vital for epithelial cell shape and polarity.
  • Molecular mechanisms regulating contraction during epithelial cell elongation remain unclear.

Purpose of the Study:

  • To investigate the role of ROCK1 and ROCK2 in regulating epithelial cell shape and polarity.
  • To elucidate the molecular mechanisms by which ROCK proteins influence cell shape acquisition.

Main Methods:

  • Induction of cell-cell adhesion in human keratinocytes.
  • Depletion of ROCK proteins using genetic methods.
  • Analysis of cell shape, junction remodeling, and F-actin organization.
  • Biochemical assays to assess myosin II phosphorylation and phosphatase activity.

Main Results:

  • Human keratinocytes adopt hexagonal shapes upon cell adhesion, correlating with increased lateral height and epithelial polarization.
  • ROCK1 and ROCK2 depletion disrupts hexagonal cell shape acquisition and lateral domain elongation.
  • ROCK proteins regulate thin bundle contraction and positioning, crucial for stabilizing elongating lateral domains.
  • E-cadherin clustering triggers ROCK-dependent myosin phosphatase inactivation and myosin light chain phosphorylation, promoting cell elongation.

Conclusions:

  • ROCK proteins are essential for acquiring elongated and geometric cell shapes in epithelial cells.
  • These shape changes are critical events during epithelial differentiation.
  • ROCK-mediated regulation of myosin II contraction is key to epithelial morphogenesis.