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Atomic Force Microscopy01:08

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AFM-based Mapping of the Elastic Properties of Cell Walls: at Tissue, Cellular, and Subcellular Resolutions
10:26

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Published on: July 24, 2014

Vacuolar structures can be identified by AFM elasticity mapping.

Christoph Riethmüller1, Tilman E Schäffer, Ferry Kienberger

  • 1Institute of Physiology II, University of Muenster, Münster, Germany. chrth@uni-muenster.de

Ultramicroscopy
|July 21, 2007
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Summary

Atomic force microscopy (AFM) now images and mechanically characterizes intracellular organelles in whole cells. This new method reveals vacuolar organelles as protein-poor spots of reduced stiffness in endothelial cells.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Microscopy

Background:

  • Fluid-filled organelles like vesicles, endosomes, and pinosomes are crucial for cellular signaling and transport.
  • Endothelial cells form a barrier and can create vacuolar organelles involved in fluid transport, especially during inflammation.
  • Previously, vacuolar organelles were only visualized using transmission electron microscopy.

Purpose of the Study:

  • To develop and present a novel method for imaging and mechanically characterizing intracellular structures in whole cells.
  • To investigate the nanomechanical properties of vacuolar organelles in endothelial cells.
  • To provide a new dimension for studying intracellular organelles using mechanical properties.

Main Methods:

  • Utilizing atomic force microscopy (AFM) to image and perform nanomechanical analysis on whole cells.
  • Employing glutaraldehyde fixation to crosslink cellular proteins, making plasma membrane structures observable.
  • Corroborating AFM findings with scanning electron microscopy (SEM) and fluorescence microscopy.

Main Results:

  • AFM identified plasma membrane depressions around the cell nucleus as spots of reduced stiffness.
  • SEM confirmed these structures to have a pit-like appearance.
  • Fluorescence microscopy revealed analogous protein-poor spots, linking mechanical rigidity to crosslinked proteins.

Conclusions:

  • Atomic force microscopy offers a new approach to mechanically characterize intracellular organelles in whole cells.
  • The study successfully identified and characterized vacuolar organelles in endothelial cells based on their mechanical properties.
  • This AFM-based method opens new avenues for investigating the mechanical behavior of cellular structures.