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Evaluation of Cancer Stem Cell Migration Using Compartmentalizing Microfluidic Devices and Live Cell Imaging
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A molecular clock controls periodically driven cell migration in confined spaces.

Sung Hoon Lee1, Jay C Hou2, Archer Hamidzadeh1

  • 1Yale Systems Biology Institute, Yale University, West Haven, CT 06516, USA; Department of Biomedical Engineering, Yale University, New Haven, CT 06520, USA.

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|June 9, 2022
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Summary

Cell migration in dense environments relies on cyclic RhoA activity, controlled by GEF-H1 oscillations triggered by calcium. This molecular clock, driven by microtubule dynamics, accelerates cell movement when its frequency increases.

Keywords:
GEF-H1RhoA guanine exchange factorcell migrationcomputational modelconfining spacesintracellular calciummicrotubule dynamicsmolecular clocknegative feedbackoscillations

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • Cellular migration through dense extracellular matrices is crucial for processes like invasive spread and tissue remodeling.
  • The underlying molecular mechanisms governing cell navigation in confined environments remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular clock and signaling pathways driving cell migration in physically confining environments.
  • To investigate the role of RhoA GTPase, GEF-H1, and intracellular calcium in mediating this process.

Main Methods:

  • Utilized a combination of live-cell imaging, biochemical assays, and mathematical modeling.
  • Investigated the dynamics of RhoA GTPase and GEF-H1 activity.
  • Analyzed the role of microtubule dynamics and intracellular calcium signaling.

Main Results:

  • Identified cyclic changes in RhoA activity, driven by oscillatory GEF-H1, as key mediators of cell migration.
  • Demonstrated that persistent intracellular calcium increase triggers these oscillations.
  • Revealed a molecular clock mechanism based on two coupled negative feedback loops involving microtubule dynamics.
  • Showed that increasing clock frequency enhances cell migration speed in confined spaces.

Conclusions:

  • The study reveals a novel molecular clock mechanism regulating cell migration in confined environments.
  • This mechanism involves RhoA, GEF-H1, calcium signaling, and microtubule dynamics.
  • The findings provide a foundation for understanding cell migration in complex biological settings and potential therapeutic targets.