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Actin cortex architecture regulates cell surface tension.

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Summary
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Animal cell shape depends on the actin cortex. This study reveals actin network architecture, not just myosin motors, is crucial for regulating cell tension and shape, especially during cell division.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Animal cell shape is governed by the cortical actin network and myosin-driven tension.
  • Tension gradients within the cortex drive cell deformations.
  • Prior research primarily focused on myosin motors for cortical tension regulation.

Purpose of the Study:

  • To investigate the role of actin network architecture in regulating cortical tension.
  • To determine how actin filament length regulators impact mitotic cortex thickness and tension.
  • To elucidate the physical mechanisms underlying cortical tension regulation.

Main Methods:

  • Observation of actin cortex thickness and tension correlation during cell-cycle progression.
  • Analysis of actin filament length regulators (CFL1, CAPZB, DIAPH1) in mitotic cells.
  • Computational modeling to identify mechanisms of tension regulation.

Main Results:

  • Actin cortex thickness and tension are inversely correlated during cell-cycle progression.
  • CFL1, CAPZB, and DIAPH1 regulate mitotic cortex thickness.
  • Both increased and decreased cortex thickness reduce tension in mitosis, suggesting a tension maximum at intermediate lengths.
  • A computational model identified a physical mechanism for maximum tension at intermediate actin filament lengths.

Conclusions:

  • Actin network architecture is as critical as myosin activity in regulating cell surface tension.
  • The mitotic cortex is optimized near a tension maximum, influenced by actin filament length.
  • Understanding actin architecture provides new insights into cell shape determination and mechanics.