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Membrane composition-dependent patterning of Rho and F-actin in an artificial cell cortex.

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Membrane composition regulates cell cortex patterning. Manipulating lipid levels in artificial cell systems altered F-actin assembly and Rho dynamics, revealing membrane control over cortical excitability.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Cortical excitability involves dynamic F-actin assembly waves in the cell cortex.
  • The plasma membrane's role in regulating this dynamic patterning is not fully understood.
  • Phospholipids and phosphoinositides are known to be involved in other excitable systems.

Purpose of the Study:

  • To investigate if membrane composition regulates dynamic cytokinetic patterning.
  • To explore the role of specific lipids in self-organized cortical patterning.

Main Methods:

  • Utilized an artificial cell cortex model using Xenopus laevis egg extract and supported lipid bilayers (SLBs).
  • Manipulated the levels of key lipids within the SLBs.
  • Observed the dynamics of active Rho and F-actin, and Rho activation kinetics.

Main Results:

  • Demonstrated that membrane composition significantly regulates self-organized cortical patterning.
  • Showed that altering lipid levels (e.g., phosphatidylinositol 4,5-bisphosphate, phosphatidylethanolamine, sphingomyelin, cholesterol) impacts traveling waves and standing oscillations of active Rho and F-actin.
  • Found changes in Rho activation and F-actin assembly kinetics based on membrane lipid composition.

Conclusions:

  • Membrane composition is a key regulator of cortical F-actin assembly.
  • Emergent active Rho and F-actin patterning is controlled by membrane properties.
  • This study highlights the importance of membrane-dependent regulation in cellular excitability.