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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Measurement of Liver Stiffness Using Atomic Force Microscopy Coupled with Polarization Microscopy
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Quantitating membrane bleb stiffness using AFM force spectroscopy and an optical sideview setup.

Carina Gonnermann1, Chaolie Huang, Sarah F Becker

  • 1Karlsruhe Institute of Technology (KIT), Center for Functional Nanostructures, Wolfgang-Gaede-Strasse 1a, 76131 Karlsruhe, Germany. clemens.franz@kit.edu.

Integrative Biology : Quantitative Biosciences From Nano to Macro
|February 25, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a side-view system for atomic force microscopy (AFM) to observe cell shape changes during mechanical measurements. This reveals that membrane blebs, which are cell protrusions, are less stiff and can weaken cell-cell adhesion.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Mechanobiology

Background:

  • Atomic force microscopy (AFM) with optical microscopy is vital for single-cell mechanics.
  • Standard AFM setups lack vertical cell visualization, hindering the study of dynamic events like membrane blebbing.

Purpose of the Study:

  • To integrate a mirror-based side-view system into AFM for visualizing vertical cell shape changes.
  • To investigate the mechanical properties of Xenopus cranial neural crest (CNC) cells during membrane blebbing.
  • To correlate cell morphology with AFM force spectroscopy data.

Main Methods:

  • Integration of a mirror-based side-view system with AFM and optical microscopy.
  • Quantitative analysis of cell elasticity and adhesion forces during bleb formation.
  • Comparison of bleb stiffness with non-blebbing membrane regions and blebbistatin-treated cells.

Main Results:

  • Membrane blebs exhibit significantly lower stiffness than non-blebbing membrane regions.
  • Bleb stiffness is comparable to that of cells treated with blebbistatin, indicating a lack of actomyosin network.
  • Blebs within cell-cell contact zones reduce cell-cell adhesion forces, potentially hindering reinforcement or promoting detachment.

Conclusions:

  • The side-view AFM system enables simultaneous monitoring of cell morphology and mechanical properties.
  • Membrane blebs are mechanically distinct, softer structures that can negatively impact cell-cell adhesion.
  • This integrated approach offers new insights into the interplay between cell mechanics, morphology, and adhesion.