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UBE2C orchestrates bone formation through stabilization of SMAD1/5

Hui Zhang1, Yangge Du1, Dazhuang Lu1

  • 1Department of Prosthodontics, Peking University School and Hospital of Stomatology, 22 Zhongguancun South Avenue, Haidian District, 100081 Beijing, China; National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & National Health Commission Key Laboratory of Digital Technology of Stomatology, 22 Zhongguancun South Avenue, Haidian District, 100081 Beijing, China.

Bone
|June 25, 2024
PubMed

Insights

Ubiquitin-conjugating enzyme 2C (UBE2C) is crucial for bone marrow mesenchymal stem cell (BMSC) growth and osteogenic differentiation. UBE2C stabilizes SMAD1/5, promoting bone formation and repair, making it a target for bone regeneration therapies.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Orthopedics

Background:

  • Ubiquitin-conjugating enzyme 2C (UBE2C) is known to influence cell proliferation and cancer progression.
  • The specific role of UBE2C in bone marrow mesenchymal stem/stromal cells (BMSCs) and bone metabolism is not well understood.

Purpose of the Study:

  • To investigate the function and mechanism of UBE2C in BMSC growth, differentiation, and bone formation.
  • To explore UBE2C's potential as a therapeutic target for bone regeneration.

Main Methods:

  • Conditional Ube2c knockout mice models in BMSCs and osteoblasts.
  • Assessment of skeletal bone mass and bone repair capacity.
  • In vitro studies using human BMSCs with UBE2C knockdown.
  • Analysis of BMSC proliferation, apoptosis, osteogenic, and osteoclastic differentiation.
  • Mechanistic studies involving SMAD1/5 protein expression and signaling pathways.

Main Results:

  • Conditional Ube2c deletion in mice led to reduced skeletal bone mass and impaired bone repair.
  • Ube2c knockout BMSCs showed reduced proliferation but no change in apoptosis.
  • Osteoclastic activity was enhanced, and osteogenic differentiation was reduced in knockout mice.
  • Human BMSCs with UBE2C knockdown exhibited diminished osteogenic differentiation capacity.
  • UBE2C stabilizes SMAD1/5 protein levels, regulating osteogenic differentiation independently of its enzymatic activity.

Conclusions:

  • UBE2C plays a critical role in bone formation by promoting osteogenic differentiation.
  • UBE2C enhances osteogenic differentiation via stabilization of SMAD1/5 signaling.
  • UBE2C is a potential therapeutic target for BMSC-based bone regeneration strategies.
Keywords:
BMSCsBone formationSMAD1SMAD5UBE2C

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