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Researchers measured cell membrane stiffness using magnetic particles. They found anisotropic stiffness when using immunoglobulin G, suggesting lipid bilayer detachment from the actin cortex, impacting cell functions.

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Area of Science:

  • Cellular mechanics
  • Biophysics
  • Immunology

Background:

  • Cell membrane and actin cortex mechanical properties are crucial for cell division and immunity.
  • The cell membrane's mechanical structure and dynamics are anisotropic, requiring specialized measurement techniques.
  • Existing methods may not fully capture the inherent anisotropy of the cell membrane system.

Purpose of the Study:

  • To develop and apply a technique for measuring the anisotropic mechanical properties of the cell membrane and actin cortex.
  • To investigate the relationship between lipid bilayer attachment to the actin cortex and overall cell stiffness.
  • To provide insights into cell membrane mechanics relevant to processes like phagocytosis and blebbing.

Main Methods:

  • Combined magnetic particle actuation with rotational and translational particle tracking.
  • Simultaneously measured mechanical stiffness in three rotational and two translational directions.
  • Utilized particles functionalized with integrins and immunoglobulin G (IgG) to probe different interactions.

Main Results:

  • Integrin-bound particles showed isotropic stiffness with frequency-dependent shear modulus.
  • IgG-bound particles exhibited anisotropic stiffness, with a 10-fold reduction in one dimension.
  • The reduced stiffness in one dimension is hypothesized to result from lipid bilayer detachment from the actin cortex.

Conclusions:

  • The developed technique can capture the anisotropic mechanical properties of the cell membrane.
  • Local detachment of the lipid bilayer from the actin cortex can significantly reduce cell membrane stiffness.
  • This method offers new avenues for understanding cell membrane mechanics in biological processes.