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Mouse Embryonic Lung Culture, A System to Evaluate the Molecular Mechanisms of Branching
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Tissue geometry may govern lung branching mode selection.

Uduak Z George1, Sharon R Lubkin2

  • 1College of Engineering, University of Georgia, Athens, GA 30602, USA.

Journal of Theoretical Biology
|January 14, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals a simple mechanism controlling lung branching patterns. Tissue geometry dictates whether lung tubules elongate, bend, flatten, or bifurcate, generating diverse branching modes.

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Area of Science:

  • Developmental biology
  • Computational biology
  • Biophysics

Background:

  • Lung branching morphogenesis involves domain, planar, and orthogonal patterns.
  • Molecular factors like fibroblast growth factor 10 are known, but their role in actuating specific branching patterns remains unclear.

Purpose of the Study:

  • To identify mechanisms determining distinct lung branching modes.
  • To investigate how morphogen transport and flux localization influence branching patterns.

Main Methods:

  • Development of a computational model for the epithelial lung bud and surrounding mesenchyme.
  • Simulation of morphogen transport and flux at lobe surfaces and edges.

Main Results:

  • A single, simple mechanism can theoretically direct epithelial tubule elongation, bending, flattening, or bifurcation based on local tissue geometric ratios.
  • This mechanism can generate both orthogonal and planar branching patterns, solely dependent on geometric ratios.

Conclusions:

  • Tissue geometry is a critical determinant of lung branching patterns.
  • A unified, simple mechanism explains diverse lung branching morphogenesis, highlighting the interplay between geometry and signaling.