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Direct Mouse Trauma/Burn Model of Heterotopic Ossification
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KLF2/PPARγ axis contributes to trauma-induced heterotopic ossification by regulating mitochondrial dysfunction.

Ziyang Sun1,2, Hang Liu1,2, Yuehao Hu3

  • 1Department of Orthopedics, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Cell Proliferation
|June 21, 2023
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Summary

Trauma-induced heterotopic ossification (HO) involves abnormal bone growth. Targeting the KLF2/PPARγ axis and mitochondrial dysfunction in tendon stem cells may offer new therapies for this condition.

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Area of Science:

  • Orthopedics
  • Cell Biology
  • Biochemistry

Background:

  • Trauma-induced heterotopic ossification (HO) is characterized by abnormal bone formation after musculoskeletal injury.
  • Dysregulated osteogenic differentiation is implicated in HO pathogenesis.
  • The roles of Krüppel-like factor 2 (KLF2) and peroxisome proliferator-activated receptor gamma (PPARγ) in HO are not well understood.

Purpose of the Study:

  • To investigate the roles and interrelationships of KLF2 and PPARγ in trauma-induced HO.
  • To explore the involvement of mitochondrial dysfunction and reactive oxygen species (ROS) in HO development.
  • To determine the therapeutic potential of targeting the KLF2/PPARγ axis and mitochondrial function.

Main Methods:

  • A murine burn/tenotomy model was used to study HO in vivo.
  • Tendon stem/progenitor cells (TSPCs) were analyzed for KLF2 and PPARγ expression.
  • In vitro studies involved osteogenic induction of TSPCs.
  • Mitochondrial function and ROS production were assessed.

Main Results:

  • Elevated KLF2 and reduced PPARγ were observed in TSPCs during HO formation.
  • KLF2 inhibition and PPARγ promotion attenuated HO, with PPARγ effects dependent on KLF2 levels.
  • Mitochondrial dysfunction and increased ROS contributed to HO, but were modulated by KLF2/PPARγ.
  • Targeting KLF2/PPARγ axis improved mitochondrial function and redox balance, reducing osteogenesis.

Conclusions:

  • The KLF2/PPARγ axis regulates trauma-induced HO by modulating mitochondrial dysfunction and ROS production in TSPCs.
  • This axis impacts HO through effects on cellular redox balance.
  • Targeting KLF2/PPARγ and mitochondrial dysfunction presents promising therapeutic strategies for HO.