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Mechanochemical Signaling Directs Cell-Shape Change.

Eric S Schiffhauer1, Douglas N Robinson2

  • 1Department of Cell Biology, Johns Hopkins University, Baltimore, Maryland.

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Cells dynamically change shape by integrating mechanical and chemical signals. Force-sensitive proteins respond to stress, enabling robust cell shape changes crucial for development and disease prevention.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Cellular functions like division and migration require dynamic shape changes.
  • Cells integrate chemical and mechanical signals to produce forces for these shape changes.
  • Mechanochemical integration is vital for processes such as cell migration, fusion, and cytokinesis.

Purpose of the Study:

  • To quantitatively understand cell mechanics and protein dynamics in cell shape changes.
  • To investigate how cells sense mechanical forces and tune their force-generating machinery.
  • To elucidate the molecular mechanisms of force-sensitive cytoskeletal protein accumulation.

Main Methods:

  • Quantitative analysis of cell mechanics and protein dynamics.
  • Modeling of cytokinesis and cell shape change processes.
  • Investigating the accumulation of force-sensitive cytoskeletal proteins (myosin II, α-actinin, filamin) under mechanical stress.

Main Results:

  • Developed a quantitative understanding of cell mechanics and protein dynamics.
  • Accounted for furrow ingression during cytokinesis using a model.
  • Identified force-sensitive cytoskeletal proteins that accumulate in response to mechanical stress.
  • Developed a physical theory for mechanosensitive protein accumulation, predicting paralog-specific behaviors and optimal actin-binding affinity.

Conclusions:

  • Cellular shape changes rely on the ability to sense and respond to mechanical forces via force-sensitive cytoskeletal proteins.
  • Mechanisms of mechanosensitive protein accumulation ensure robust cell shape changes.
  • Dysregulation of these mechanisms can lead to diseases like cancer metastasis and loss of tissue integrity.