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Related Experiment Video

Updated: Jan 5, 2026

Mouse Embryonic Lung Culture, A System to Evaluate the Molecular Mechanisms of Branching
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Smooth muscle differentiation shapes domain branches during mouse lung development.

Katharine Goodwin1, Sheng Mao2, Tristan Guyomar2,3

  • 1Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ 08544, USA.

Development (Cambridge, England)
|October 25, 2019
PubMed
Summary

Smooth muscle is crucial for proper lung branching morphogenesis. Its differentiation shapes airway branches, and disruptions lead to abnormal lung development and reduced branch stereotypy.

Keywords:
Mechanical stressSymmetry breakingTissue morphodynamics

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Area of Science:

  • Developmental biology
  • Cell biology
  • Biophysics

Background:

  • Branching morphogenesis generates complex arborized networks, like the mouse lung, essential for fluid transport.
  • Lung airway development involves epithelial and smooth muscle layers, with smooth muscle originating from embryonic mesenchyme.

Purpose of the Study:

  • To investigate the role of smooth muscle differentiation in shaping domain branches during mouse lung development.
  • To understand the physical mechanisms underlying airway branching morphogenesis.

Main Methods:

  • Genetic and pharmacological perturbations of smooth muscle differentiation.
  • Analysis of domain branch position, morphology, and smooth muscle patterns.
  • Computational modeling of epithelial proliferation and smooth muscle influence.

Main Results:

  • Domain branch formation and associated smooth muscle patterns are highly stereotyped.
  • Altering smooth muscle differentiation (loss or increase) causes abnormal branching, including ectopic branches and reduced stereotypy.
  • Computational models show smooth muscle wrapping is essential for shaping epithelial branches, not just epithelial proliferation.

Conclusions:

  • Smooth muscle plays a critical, instructive role in regulating the stereotyped branching of the mouse lung.
  • The physical interaction between smooth muscle and epithelium is a key determinant of airway morphogenesis.
  • This study elucidates the biophysical forces driving lung branching.