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Updated: Aug 14, 2025

Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions
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Protrusion Force Microscopy: A Method to Quantify Forces Developed by Cell Protrusions

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Protrusion growth driven by myosin-generated force.

Gillian N Fitz1, Meredith L Weck1, Caroline Bodnya1

  • 1Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.

Developmental Cell
|January 10, 2023
PubMed
Summary
This summary is machine-generated.

Myosin motors can directly drive cell protrusion growth by applying force to the cell membrane, independent of traditional actin assembly mechanisms. This discovery reveals a new pathway for cell shape regulation and movement.

Keywords:
actincytoskeletonfilopodiamicrovillimotorplasma membranestereocilia

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Motors

Background:

  • Actin-based protrusions are crucial for eukaryotic cell functions.
  • Current models emphasize actin assembly for protrusion growth.
  • The role of myosin motors in protrusion elongation is largely unexplored.

Purpose of the Study:

  • To investigate if myosin-generated force can drive cell protrusion growth.
  • To explore the mechanism by which myosin motors contribute to protrusion dynamics.

Main Methods:

  • Utilized an inducible system to control myosin motor domain docking to membrane-binding modules.
  • Applied temporal control to activate myosin-generated force in cell culture models (human, mouse, pig).
  • Analyzed protrusion elongation in response to controlled force application.

Main Results:

  • Myosin-generated force alone is sufficient to drive robust cell protrusion elongation.
  • Protrusion growth correlated with myosin motor accumulation at the membrane.
  • Force application required barbed-end-directed force and was independent of canonical elongation factors.

Conclusions:

  • Myosin motors can actively drive cell protrusion growth by exerting force on the plasma membrane.
  • This myosin-driven mechanism offers a novel perspective on cell motility and shape regulation.
  • The findings suggest this mechanism is biologically relevant across various cell types and contexts.