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Epithelial cell PPAR[gamma] contributes to normal lung maturation.

Dawn M Simon1, Meltem C Arikan, Sorachai Srisuma

  • 1Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Thorn 908, 75 Francis St., Boston, Massachusetts 02115, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|May 25, 2006
PubMed
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Airway epithelial Peroxisome proliferator-activated receptor (PPAR)-gamma is crucial for lung development. Ablating it causes enlarged airspaces and impaired lung function, highlighting its role in postnatal lung maturation.

Area of Science:

  • Pulmonary biology
  • Molecular genetics
  • Cellular differentiation

Background:

  • Peroxisome proliferator-activated receptor (PPAR)-gamma is a nuclear hormone receptor involved in cellular differentiation and organ development.
  • PPARgamma is expressed in various lung cell types, including airway epithelium.

Purpose of the Study:

  • To investigate the physiological role of PPARgamma in the lung.
  • To define the function of PPARgamma specifically within airway epithelial cells.

Main Methods:

  • Generation of a novel mouse model with targeted ablation of PPARgamma in airway epithelial cells.
  • Analysis of lung structure and physiology in genetically modified mice.
  • Genome-wide expression profiling of whole lung tissue and isolated airway epithelial cells.

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Main Results:

  • Airway epithelial cell-specific PPARgamma ablation resulted in enlarged airspaces due to insufficient postnatal lung maturation.
  • Physiological alterations included increased lung volumes and decreased tissue resistance.
  • Gene expression profiling revealed reduced extracellular matrix (ECM) gene expression and disrupted epithelial-mesenchymal interactions.
  • PPARgamma in airway epithelial cells regulates known targets, lipid metabolism enzymes, and differentiation markers.

Conclusions:

  • Airway epithelial PPARgamma is essential for normal postnatal lung development and maturation.
  • PPARgamma signaling in airway epithelium is critical for maintaining lung structure and function through regulation of ECM and epithelial cell differentiation.
  • These findings identify a key molecular pathway involved in lung development and provide insights into potential therapeutic targets for lung diseases.