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An In Vitro Model System to Test Mechano-Microbiological Interactions Between Bacteria and Host Cells.

Luis Carlos Santos1,2, Emilia Laura Munteanu1,3, Nicolas Biais4,5,6

  • 1Department of Biology, Brooklyn College of the City University of New York, Brooklyn, NY, USA.

Methods in Molecular Biology (Clifton, N.J.)
|September 20, 2021
PubMed
Summary
This summary is machine-generated.

Researchers visualized F-actin cytoskeleton changes using magnetic tweezers and live cell microscopy. This technique mimics bacterial forces, revealing rapid F-actin accumulation at force application sites.

Keywords:
CytoskeletonF-ActinMagnetic beadsMagnetic tweezersNeisseriaType 4 pili

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Area of Science:

  • Cell Biology
  • Biophysics
  • Microbiology

Background:

  • The F-actin cytoskeleton is crucial for cellular responses to mechanical stimuli.
  • Understanding how cells respond to forces, particularly those generated by pathogens like Neisseria gonorrhoeae, is vital.
  • Existing methods may not accurately replicate the localized forces bacteria exert on host cells.

Purpose of the Study:

  • To introduce a novel in vitro system for visualizing F-actin cytoskeleton dynamics under localized force.
  • To quantify cellular F-actin accumulation in response to forces mimicking bacterial Type IV pili.
  • To establish a method for studying cellular mechanotransduction relevant to bacterial infections.

Main Methods:

  • Development of an integrated system combining magnetic tweezers for force application and live cell fluorescence microscopy for visualization.
  • Coating magnetic beads with Neisseria gonorrhoeae Type IV pili to apply biologically relevant forces.
  • Applying controlled pulling forces to cells and observing real-time F-actin rearrangements.

Main Results:

  • Demonstrated rapid and robust accumulation of F-actin at the precise sites of applied magnetic bead pulling.
  • Successfully mimicked the magnitude of forces generated by live bacteria using the magnetic tweezers system.
  • Visualized the localized cellular response to force with high spatial and temporal resolution.

Conclusions:

  • The developed magnetic tweezers system provides an effective tool to study cellular responses to localized forces.
  • This technique allows for the investigation of F-actin dynamics in response to forces comparable to those exerted by pathogenic bacteria.
  • The findings offer insights into host-pathogen interactions at the mechanobiological level.