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Related Experiment Videos

Intermediate filament-membrane attachments function synergistically with actin-dependent contacts to regulate

Arthur C Huen1, Jung K Park, Lisa M Godsel

  • 1Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.

The Journal of Cell Biology
|December 25, 2002
PubMed
Summary

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Intermediate filament (IF) attachments to desmosomes strengthen cell adhesion. Disrupting these connections weakens tissue integrity, highlighting their crucial role in mechanical strength and cell-cell adhesion.

Area of Science:

  • Cell Biology
  • Biophysics
  • Tissue Engineering

Background:

  • Desmosomes link intermediate filaments (IFs) to cell membranes, forming a tissue scaffold.
  • The specific contribution of IF-membrane attachments to adhesion strength remains unclear.

Purpose of the Study:

  • To investigate the role of IF-membrane attachments in regulating cell-cell adhesion strength.
  • To determine if IFs synergize with actin filaments in maintaining tissue integrity.

Main Methods:

  • Generated A431 cells expressing a desmoplakin (DP) mutant (DPNTP) to disrupt IF-membrane links.
  • Assessed cell aggregate dissociation under mechanical stress.
  • Analyzed protein distribution and detergent insolubility.
  • Studied patient-derived JD-1 cells and combined DPNTP with latrunculin A treatment.

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Main Results:

  • DPNTP expression dissociated IFs from desmosomes, reducing the insoluble desmoglein pool.
  • DPNTP-expressing cell aggregates showed increased dissociation under stress.
  • Patient-derived cells with DP mutations also exhibited weaker adhesion.
  • Combined DPNTP and latrunculin A treatment caused synergistic dissociation.

Conclusions:

  • IF-membrane attachments are critical for maintaining robust cell-cell adhesion.
  • IFs and actin filaments act synergistically to enhance tissue mechanical strength.
  • Disruption of IF-membrane linkages compromises tissue integrity through reduced adhesion.