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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Skeletal Biology

Background:

  • Skeletal growth involves complex biosynthetic and catabolic processes.
  • The role of catabolic processes, like autophagy, in skeletal growth is not fully understood.
  • Autophagy is vital for maintaining tissue homeostasis.

Purpose of the Study:

  • To investigate the role of autophagy in chondrocytes during bone growth.
  • To elucidate the regulatory mechanisms of autophagy in the growth plate.
  • To determine the relationship between FGF signaling and autophagy in skeletal development.

Main Methods:

  • Investigated autophagy induction in growth plate chondrocytes during post-natal development.
  • Utilized mice lacking autophagy-related gene 7 (Atg7) in chondrocytes.
  • Examined the effects of Fgf18 and Fgfr4 deficiencies on autophagy and collagen levels.
  • Assessed the rescue of phenotypes through pharmacological autophagy activation.

Main Results:

  • Autophagy is induced in growth plate chondrocytes post-natally and regulates type II collagen (Col2) secretion.
  • Chondrocyte-specific Atg7 deficiency leads to endoplasmic reticulum storage of procollagen II (PC2) and defective Col2 matrix formation.
  • FGF18 signaling, via FGFR4 and JNK, mediates post-natal autophagy induction.
  • Fgf18 and Fgfr4 deficiencies suppress autophagy and decrease Col2 levels, with phenotypes rescued by autophagy activation.

Conclusions:

  • Autophagy is a developmentally regulated process essential for bone growth.
  • FGF signaling is a critical regulator of chondrocyte autophagy.
  • Autophagy acts as a novel effector of FGF signaling in bone development.