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Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice
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Published on: October 19, 2013

Gpr177 regulates pulmonary vasculature development.

Ming Jiang1, Wei-yao Ku, Jiang Fu

  • 1Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY 14642, USA.

Development (Cambridge, England)
|July 26, 2013
PubMed
Summary

Epithelial Wnt secretion is crucial for lung vasculature development. Disrupting this process impairs blood vessel formation and maintenance, offering insights into congenital lung diseases like alveolar capillary dysplasia.

Keywords:
HemorrhageKlf2Lung morphogenesisMouseWlsWntWntless

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Area of Science:

  • Pulmonary vascular biology
  • Developmental biology
  • Molecular genetics

Background:

  • Pulmonary vasculature development relies on epithelial-mesenchymal interactions.
  • Previous studies on epithelial Wnt contributions yielded conflicting results, potentially due to Wnt functional redundancy.

Purpose of the Study:

  • To investigate the role of epithelial Wnt secretion in pulmonary vasculature development using a conditional knockout model.
  • To elucidate the specific mechanisms by which epithelial Wnts regulate vascular and mesenchymal cell function.

Main Methods:

  • Conditional deletion of Gpr177 (Wntless) in epithelial cells using Shh-Cre mice.
  • Analysis of pulmonary vasculature structure, Wnt signaling activity, and gene expression.
  • Utilized multiple mouse models to study Wnt/β-catenin signaling pathways.

Main Results:

  • Epithelial Gpr177 deletion severely disrupted pulmonary vasculature, causing hemorrhage and abnormal development.
  • Reduced Wnt signaling affected both epithelial and mesenchymal compartments, leading to branching defects and impaired epithelial differentiation.
  • Wnt/β-catenin signaling was essential for mesenchymal proliferation, differentiation, and smooth muscle cell maintenance via Klf2 regulation.

Conclusions:

  • Epithelial Wnt secretion, mediated by Gpr177, is a novel and critical regulator of pulmonary vasculature development and maintenance.
  • These findings illuminate the pathobiology of congenital lung diseases characterized by vascular abnormalities, such as alveolar capillary dysplasia.