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Increased PDGFRalpha activation disrupts connective tissue development and drives systemic fibrosis

Lorin E Olson1, Philippe Soriano

  • 1Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.

Developmental Cell
|February 17, 2009
PubMed

Insights

Increased platelet-derived growth factor receptor alpha (PDGFRalpha) signaling drives connective tissue growth, leading to fibrosis in multiple organs. Tumor suppressors may attenuate this fibrotic disease progression.

Area of Science:

  • Developmental biology
  • Cell signaling
  • Fibrosis research

Background:

  • Platelet-derived growth factor receptor alpha (PDGFRalpha) signaling is crucial for mesenchymal cell development.
  • The role of PDGFRalpha receptor activation in maintaining tissue homeostasis remains largely uninvestigated.

Purpose of the Study:

  • To investigate the role of increased PDGFRalpha signaling in tissue homeostasis and fibrotic diseases.
  • To generate and analyze conditional knockin mice with hyperactive PDGFRalpha mutations.

Main Methods:

  • Generation of conditional knockin mice with PDGFRalpha mutations that enhance kinase activity.
  • Analysis of embryonic and adult mouse models to assess tissue development and homeostasis.
  • Investigation of PDGFRalpha signaling in an Ink4a/Arf-deficient genetic background.

Main Results:

  • Embryonic overexpression of PDGFRalpha signaling caused stromal fibroblast hyperplasia and disrupted smooth muscle development in organs.
  • Adult mice with elevated PDGFRalpha signaling exhibited increased connective tissue growth and progressive fibrosis across multiple organs.
  • Accelerated fibrosis was observed in PDGFRalpha hyperactive mice with a deficient Ink4a/Arf background, implicating tumor suppressors.

Conclusions:

  • PDGFRalpha signaling is essential for normal connective tissue development and homeostasis.
  • Aberrant PDGFRalpha signaling plays a pivotal role in the pathogenesis of systemic fibrosis.
  • Tumor suppressors may have a role in mitigating fibrotic disease progression.

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