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Cbfβ Is a Novel Modulator against Osteoarthritis by Maintaining Articular Cartilage Homeostasis through TGF-β

Xiangguo Che1, Xian Jin1, Na Rae Park1

  • 1Korea Mouse Phenotyping Center (KMPC), Department of Biochemistry and Cell Biology, Cell and Matrix Research Institute, School of Medicine, Kyungpook National University, Daegu 41944, Republic of Korea.

Cells
|April 13, 2023
PubMed

Insights

Core binding factor β (Cbfβ) maintains cartilage health by regulating TGF-β signaling. Loss of Cbfβ accelerates osteoarthritis development and cartilage degeneration, highlighting its protective role.

Area of Science:

  • Molecular and Cellular Biology
  • Rheumatology
  • Biochemistry

Background:

  • Transforming growth factor-beta (TGF-β) signaling is crucial for articular cartilage homeostasis.
  • Runx transcription factors are downstream targets of TGF-β signaling, implicated in osteoarthritis (OA).
  • The role of core binding factor β (Cbfβ) in articular cartilage integrity is largely unknown.

Purpose of the Study:

  • To investigate Cbfβ as a novel anabolic modulator of TGF-β signaling in articular cartilage.
  • To determine the role of Cbfβ in maintaining articular cartilage homeostasis and its association with OA.

Main Methods:

  • Analysis of Cbfβ expression in aged mouse and human OA cartilage.
  • Generation and analysis of articular chondrocyte-specific Cbfb-deficient mice (Cbfb△).
  • Assessment of OA progression in Cbfb△ mice under normal and surgically induced OA conditions.
  • Investigation of molecular mechanisms involving Cbfβ, Runx1, and TGF-β1 signaling in chondrocytes.

Main Results:

  • Cbfβ expression was significantly decreased in aged mouse and human OA cartilage.
  • Cbfb△ mice exhibited early cartilage degeneration and developed OA, with accelerated progression under OA induction.
  • Cbfβ deficiency impaired TGF-β1-mediated Type II collagen (Col2α1) expression and protected Runx1 from proteasomal degradation via Cbfβ/Runx1 complex formation.

Conclusions:

  • Cbfβ acts as a novel anabolic regulator essential for maintaining articular cartilage homeostasis.
  • Cbfβ plays a protective role against OA development by preserving the integrity of the TGF-β signaling pathway in articular cartilage.
Keywords:
Runx1/Cbfβ complexTGF-β signalingarticular cartilageosteoarthritisproteasomal degradation

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