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Microstructure-based nuclear lamina constitutive model.

Nima Mostafazadeh1, Zhangli Peng1

  • 1Department of Biomedical Engineering, University of Illinois Chicago, Chicago, Illinois, USA.

Cytoskeleton (Hoboken, N.J.)
|February 12, 2024
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Summary
This summary is machine-generated.

We developed a new model of the nuclear lamina network, crucial for nuclear mechanical stability. This model accurately predicts nuclear mechanics and the impact of laminopathies.

Keywords:
finite element methodmolecular dynamicsmultiscale modelingnucleoskeletonstatistical mechanics

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Area of Science:

  • Cell Biology
  • Biophysics
  • Materials Science

Background:

  • The nuclear lamina provides essential mechanical stability to the nucleus.
  • Modeling the complex, multilayered protein network of the nuclear lamina presents significant challenges.

Purpose of the Study:

  • To develop a constitutive model of the nuclear lamina network based on its microstructure.
  • To accurately predict the force-extension response of lamin dimers and the mechanical behavior of the entire nuclear lamina.

Main Methods:

  • Molecular simulations were used to predict the force-extension response of lamin dimers.
  • A semiflexible worm-like chain model was developed for lamin dimers.
  • A 2D network continuum model of the nuclear lamina was created using the dimer model.
  • Finite element simulations were performed for the entire nucleus and during nuclear transmigration.

Main Results:

  • The model accurately predicts the force-extension response of lamin dimers, including stretching and uncoiling phases.
  • The nuclear lamina network exhibits sharp initial strain-hardening behavior.
  • Simulations revealed the impact of network density and uncoiling constants on nuclear transmigration forces.

Conclusions:

  • The developed microstructure-based nuclear lamina model accurately captures nuclear mechanics.
  • This model provides insights into how laminopathies and mutations affect nuclear mechanical properties.
  • The model enables detailed simulations of nuclear behavior under various conditions.