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Micro-Mechanical Characterization of Lung Tissue Using Atomic Force Microscopy
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Elastosis during airway wall remodeling explains multiple co-existing instability patterns.

Mona Eskandari1, Ali Javili2, Ellen Kuhl3

  • 1Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.

Journal of Theoretical Biology
|May 24, 2016
PubMed
Summary
This summary is machine-generated.

Airway remodeling in chronic lung disease involves stiffening, leading to complex folding patterns. This study reveals how evolving material properties, not just growth, cause multiple wavelengths in airway obstruction.

Keywords:
AirwayElastosisFinite element analysisFoldingGrowth and remodelingInstability

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Area of Science:

  • Biomechanics
  • Computational Biology
  • Medical Engineering

Background:

  • Chronic lung diseases feature airway wall inflammation and elastosis, leading to mechanical instabilities and obstruction.
  • Previous models of airway folding assumed constant material properties, neglecting progressive stiffening observed clinically.

Purpose of the Study:

  • To investigate the impact of temporally evolving material properties on the post-bifurcation behavior of the airway wall.
  • To understand the mechanical basis for multiple wavelengths observed in diseased airways.

Main Methods:

  • Computational modeling of airway wall mechanics.
  • Analysis of post-buckling behavior with evolving material stiffnesses.

Main Results:

  • A growing and stiffening inner airway layer triggers a secondary bifurcation after initial instability.
  • Evolving material stiffness leads to failure modes with multiple co-existing wavelengths, distinct from period doubling.
  • This phenomenon explains clinically observed multiple wavelengths in diseased airways.

Conclusions:

  • Gradual airway wall stiffening, a hallmark of airway elastosis, is a key factor in generating complex folding patterns and multiple wavelengths.
  • The findings offer insights into airway obstruction mechanisms and are applicable to other remodeling processes like aneurysm formation and brain folding.