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Updated: Apr 19, 2026

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External mechanical force drives axonal cytoskeletal rearrangements.

Grace L Swaim1, Oliver V Glomb2, Yi Xie2

  • 1Department of Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA; Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510, USA.

Current Biology : CB
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

External forces impact axon integrity. A novel mechanism involving Talin, RhoA, and myosin II in C. elegans motor neurons maintains cytoskeletal continuity and prevents axon breakage under mechanical stress.

Keywords:
F-actinRhoAaxoncytoskeletonmechanotransductionmicrotubulemyosinneuronspectrintalin

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biophysics

Background:

  • Axons are subjected to mechanical forces from animal movement.
  • The role of these forces in non-mechanosensory neurons, like motor neurons, is not well understood.
  • Axon integrity is crucial for proper neuronal function.

Purpose of the Study:

  • To investigate the axonal response to external physiological forces.
  • To identify molecular players involved in maintaining axon integrity under mechanical stress.
  • To elucidate the mechanism by which mechanical forces affect cytoskeletal continuity in motor neuron axons.

Main Methods:

  • Utilized cell-specific degradation alleles and chemogenetic silencing in C. elegans.
  • Studied motor neuron axons responding to forces from muscle contraction.
  • Investigated the role of Talin, RhoA, and non-muscle myosin II.
  • Disrupted the spectrin-based membrane-associated skeleton to assess axon integrity.

Main Results:

  • Talin, RhoA, and non-muscle myosin II are essential for cytoskeletal continuity in response to muscle-generated forces.
  • This pathway regulates microtubule polymer oscillations, maintaining cytoskeletal integrity.
  • Disruption of the spectrin skeleton leads to excessive RhoA activity, causing axon breakage.
  • Reduced mechanical force or neuronal RhoA degradation prevents axon breakage in spectrin mutants.

Conclusions:

  • Uncovered an axonal mechanism that senses and responds to external mechanical forces.
  • This mechanism is critical for maintaining cytoskeletal continuity and overall axon integrity.
  • RhoA activity and cytoskeletal dynamics are key regulators of axon stability under physiological mechanical load.