KLF2/PPARγ axis contributes to trauma-induced heterotopic ossification by regulating mitochondrial dysfunction.

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.