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Area of Science:

  • Cellular mechanics
  • Biophysics
  • Cancer biology

Background:

  • The actin cortex regulates cell mechanics and migration.
  • Cancer cells exhibit altered actin cytoskeleton and mechanical properties linked to malignancy.
  • Epithelial-mesenchymal transition (EMT) is crucial in cancer progression.

Purpose of the Study:

  • To investigate the frequency-dependent viscoelastic mechanics of the actin cortex.
  • To determine the effects of EMT on actin cortex rheology in human epithelial cells.

Main Methods:

  • Utilized atomic force microscopy-based cell confinement.
  • Quantified actin cortex rheology across a frequency range (0.02-2 Hz).
  • Studied human breast, lung, and prostate epithelial cells before and after EMT.

Main Results:

  • Observed opposite EMT-induced changes in interphase and mitosis.
  • Actin cortex softens upon EMT in interphase.
  • Actin cortex stiffens upon EMT in mitosis.

Conclusions:

  • EMT induces consistent rheological trends in human cells.
  • These changes reflect significant structural alterations in the actin cytoskeleton.
  • Findings provide insights into cancer cell mechanical property modulation during EMT.