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3D particle tracking on a two-photon microscope.

Timothy Ragan1, Hayden Huang, Peter So

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. tragan@mit.edu

Journal of Fluorescence
|March 18, 2006
PubMed
Summary
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A novel 3D single-particle-tracking system visualizes cellular mechanics. This advanced microscopy technique reveals that cell responses to planar stress occur in three dimensions, necessitating 3D modeling for accurate biomechanical analysis.

Area of Science:

  • Biophysics
  • Cell Biology
  • Microscopy

Background:

  • Understanding cellular mechanical properties is crucial for cell biology.
  • Existing methods often lack the resolution or dimensionality to fully capture complex cellular responses.

Purpose of the Study:

  • To develop and validate a 3D single-particle-tracking (SPT) system for precise cellular mechanical measurements.
  • To investigate the three-dimensional viscoelastic mechanical response of kidney cells.

Main Methods:

  • Developed a 3D SPT system using two-photon excitation fluorescence microscopy.
  • Implemented two feedback-controlled tracking techniques: volumetric scanning and aberration-based axial localization.
  • Applied magnetic manipulation to apply force to cells via attached paramagnetic spheres.

Related Experiment Videos

  • Monitored cytoskeleton deformation by tracking fluorescent polystyrene spheres attached to cells.

    • Main Results:

    • The 3D SPT system achieved tracking over 100 µm with a bandwidth up to 30 Hz.
    • Demonstrated that planar stress applied to kidney cells induces strain in all three dimensions.
    • Validated the necessity of 3D motion tracking for accurate modeling of cellular mechanical responses.

    Conclusions:

    • The developed 3D SPT system provides a powerful tool for studying cellular biomechanics.
    • Cellular mechanical responses are inherently three-dimensional, even when subjected to planar forces.
    • Accurate modeling of cell mechanics requires consideration of three-dimensional deformation.