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Fibroblast growth factor (FGF) signaling is crucial for tendon-bone development. Loss of FGF receptor 2 (Fgfr2) biases progenitor cells toward chondrocytes, leading to abnormal bone formation at tendon-bone junctions.

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Craniofacial developmentEnthesisFGFMouseNotchPerichondriumTendon

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Area of Science:

  • Developmental biology
  • Connective tissue development
  • Skeletal biology

Background:

  • Tendon and bone are connected by a specialized transitional tissue derived from bipotent progenitors expressing scleraxis (Scx) and Sox9.
  • These Scx+/Sox9+ progenitors can differentiate into tenocytes or chondrocytes.
  • The mechanism controlling their differentiation at the tendon-bone interface during embryogenesis is not understood.

Purpose of the Study:

  • To investigate the role of FGF signaling in regulating the bipotency and differentiation of Scx+/Sox9+ progenitors at the tendon-bone interface.
  • To elucidate the molecular mechanisms underlying zonal patterning and cell fate decisions in this region.

Main Methods:

  • Utilized mouse models with targeted deletion of Fgfr2 at the tendon-bone interface.
  • Analyzed gene expression patterns, including Scx and Sox9.
  • Investigated downstream signaling pathways such as Notch signaling.

Main Results:

  • Loss of Fgfr2 in the tendon-bone interface reduced Scx expression in Scx+/Sox9+ progenitors.
  • This led to biased differentiation of these progenitors into Sox9+ chondrocytes.
  • Decreased Notch2-Dll1 signaling was observed, correlating with chondrocyte expansion and ectopic endochondral bone formation.

Conclusions:

  • FGF signaling, specifically through Fgfr2, is essential for maintaining the bipotency of tendon-bone progenitors.
  • FGF signaling directs zonal patterning by regulating cell fate decisions, involving Notch signaling.
  • Disruption of FGF signaling leads to aberrant chondrogenesis and ectopic bone formation at tendon-bone attachment sites.