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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
Summary
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.
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.
