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Related Concept Videos

The Nucleus01:32

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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The nucleus feels the force, LINCed in or not!

Zeinab Jahed1, Mohammad Rk Mofrad2

  • 1Molecular Cell Biomechanics Laboratory, Departments of Bioengineering and Mechanical Engineering, University of California, Berkeley, CA 94720, United States.

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Summary

Mechanical forces impact cell biology, causing nuclear deformation and remodeling. This review examines how the cytoskeleton and nucleoskeleton transmit these physical signals to the nucleus.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Mechanical signals from the extracellular microenvironment influence biological processes.
  • Physical forces are transmitted to the cell nucleus, leading to its deformation and remodeling.
  • Nuclear deformation has significant consequences, including chromatin reorganization, altered gene expression, and nuclear envelope rupture.

Purpose of the Study:

  • To review the processes by which the cell nucleus experiences mechanical stresses.
  • To discuss the evidence for a direct link between the cytoskeleton and nucleoskeleton in nuclear deformation.
  • To explore alternative mechanisms of mechanical signal transmission to the nucleus.

Main Methods:

  • Literature review of recent studies on nuclear mechanics and mechanotransduction.
  • Analysis of evidence supporting direct and indirect coupling mechanisms between cytoskeleton and nucleoskeleton.
  • Synthesis of findings on the consequences of nuclear deformation.

Main Results:

  • The nucleus is subjected to mechanical stresses from its microenvironment.
  • A direct physical link between the cytoskeleton and nucleoskeleton is a widely accepted mechanism for nuclear deformation.
  • Alternative pathways for mechanical signal transmission to the nucleus have been proposed and are under investigation.

Conclusions:

  • Nuclear deformation is a critical response to mechanical forces, impacting cellular functions.
  • The role of direct cytoskeleton-nucleoskeleton coupling in nuclear deformation is supported by substantial evidence.
  • Further research is needed to fully elucidate all mechanisms involved in nuclear mechanotransduction.