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Related Experiment Video

Updated: Jun 14, 2025

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Published on: August 31, 2021

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Confinement controls the directional cell responses to fluid forces.

Farshad Amiri1, Ayuba A Akinpelu1, William C Keith1

  • 1Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA.

Cell Reports
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

In confined spaces, cells reverse direction and move upstream against fluid flow. This response is mediated by actin polymerization, NHE1, and calcium signaling, impacting cell migration.

Keywords:
CP: Cell biologyNHE1actin polymerizationactomyosin contractilitycancer metastasischemotaxisconfined migrationhydraulic resistancemechanosensitive ion channelsnuclear stiffnessupstream migration

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Area of Science:

  • Cell biology
  • Biophysics
  • Microfluidics

Background:

  • Cell migration is crucial for development and disease.
  • Understanding cell responses to physical forces in confined environments is limited.
  • Fluid forces can significantly impact cell behavior.

Purpose of the Study:

  • To investigate how fluid forces influence cell migration in confined spaces.
  • To elucidate the molecular mechanisms underlying fluid force-induced cell migration changes.
  • To explore the role of mechanosensitivity, hydraulic resistance, and chemical gradients in this process.

Main Methods:

  • Integration of microfluidics with live-cell imaging.
  • Mathematical modeling and experimental validation of cell behavior.
  • Analysis of cellular components like actin, NHE1, calcium, and myosin IIA.

Main Results:

  • Cells in tight confinements reverse direction and migrate upstream against fluid flow.
  • This reversal is less frequent with diminished mechanosensitivity, increased hydraulic resistance, or chemical gradients.
  • Actin polymerization, NHE1 activation, and calcium signaling are essential for upstream migration.
  • Myosin IIA activation enhances upstream migration.
  • Reduced lamin A/C promotes downstream migration in metastatic cells.

Conclusions:

  • Fluid forces can induce upstream cell migration in tightly confined environments.
  • A complex interplay of mechanical and biochemical factors regulates this response.
  • This mechanism may enable cancer cells to navigate high-pressure tumor microenvironments.