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Constitutive Platelet-Derived Growth Factor Receptor Beta (PDGFRB) signaling causes autoinflammation and tissue wasting. STAT1 (signal transducer and activator of transcription 1) pathway modulation rescues this, revealing its role in PDGFRB-driven phenotypes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Immunology

Background:

  • Platelet-derived growth factor (PDGF) signals via PDGFRα and PDGFRβ receptors.
  • Gain-of-function mutations in PDGFRB are linked to human genetic disorders like Penttinen and Kosaki overgrowth syndromes.
  • Constitutive PDGFRβ signaling in mice leads to lethal autoinflammation.

Purpose of the Study:

  • Investigate the mechanism of autoinflammation in mice with constitutive PDGFRβ signaling.
  • Test the hypothesis that signal transducer and activator of transcription 1 (STAT1) mediates this autoinflammatory phenotype.
  • Determine the role of STAT1 in modulating PDGFRβ-driven tissue wasting and overgrowth.

Main Methods:

  • Generated and analyzed mice with a kinase domain mutation in Pdfrb (D849V) and varying Stat1 gene status (wild-type, heterozygous, knockout).
  • Assessed autoinflammation, lifespan, and specific tissue phenotypes in Pdfrb mutant mice with different Stat1 backgrounds.
  • Investigated PDGFRβ signaling levels in fibroblasts and the role of interferon receptors in the autoinflammatory phenotype.

Main Results:

  • Mice with Pdfrb mutation and Stat1 knockout were rescued from autoinflammation and showed improved lifespan.
  • STAT1 knockout in Pdfrb mutant mice led to increased PDGFRβ signaling and progressive overgrowth, distinct from wasting.
  • Interferon receptor deletion did not rescue the wasting phenotype, indicating interferons are not required for autoinflammation.

Conclusions:

  • Elevated PDGFRβ signaling can cause tissue wasting or overgrowth, mimicking human genetic syndromes.
  • The STAT1 pathway is a critical regulator of the phenotypic spectrum driven by PDGFRβ signaling.
  • STAT1 acts as a suppressor of PDGFRβ signaling, influencing disease outcomes.