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Modeling stem cell nucleus mechanics using confocal microscopy.

Zeke Kennedy1, Joshua Newberg1, Matthew Goelzer1

  • 1Department of Mechanical and Biomedical Engineering, Boise State University, 1910 University Drive, MSd-2085, Boise, ID, 83725-2085, USA.

Biomechanics and Modeling in Mechanobiology
|August 23, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a computational framework to predict cell nucleus stiffness using confocal and atomic force microscopy (AFM). This method allows for cell-specific mechanical analysis of stem cell nuclei without specialized equipment.

Keywords:
ChromatinConfocal microscopyFinite element analysisLamin A/CMechanobiologyMesenchymal stem cellsNucleus

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Area of Science:

  • Biophysics
  • Cell Biology
  • Computational Biology

Background:

  • Nuclear mechanics is crucial for stem cell function and differentiation.
  • Visualizing nuclear structure changes is possible with confocal microscopy, but mechanical characterization requires specialized equipment.

Purpose of the Study:

  • To develop a computational framework for generating cell-specific mechanical information of cell nuclei.
  • To enable mechanical characterization using confocal and atomic force microscopy (AFM) data.

Main Methods:

  • Developed a computational framework to create finite element models of isolated cell nuclei from confocal microscopy scans.
  • Utilized atomic force microscopy (AFM) to measure experimental stiffness values.
  • Determined conversion factors to map image intensity to element stiffness for chromatin and Lamin A/C.

Main Results:

  • Successfully generated finite element models of mesenchymal stem cell nuclei.
  • Quantified the mechanical contributions of chromatin and Lamin A/C structures.
  • Predicted global nuclear stiffness in multiple nuclei using the developed framework.

Conclusions:

  • The computational framework provides a valuable tool for understanding nuclear mechanics in stem cells.
  • This approach allows for predicting nuclear stiffness based on simple imaging and AFM tests.
  • Identifies the contribution of sub-nuclear structures to overall nuclear mechanics.