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CCN1 Regulates Chondrocyte Maturation and Cartilage Development.

Yongchun Zhang1,2, Tzong-jen Sheu1,3, Donna Hoak1,3

  • 1Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, USA.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|September 13, 2015
PubMed
Summary

WNT/β-CATENIN signaling regulates skeletal development by controlling chondrocyte maturation. This study identifies CCN1 as a key downstream effector, demonstrating its crucial role in chondrocyte maturation and cartilage homeostasis.

Keywords:
CARTILAGECCN1CHONDROCYTEβ-CATENIN

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Area of Science:

  • Skeletal Biology
  • Cellular Signaling
  • Extracellular Matrix Biology

Background:

  • WNT/β-CATENIN signaling is vital for skeletal development, influencing chondrocyte differentiation and maturation.
  • The specific downstream targets of β-CATENIN in chondrocytes remain incompletely understood.

Purpose of the Study:

  • To identify downstream effectors of WNT/β-CATENIN signaling in chondrocytes.
  • To investigate the role of the matricellular protein CCN1 in chondrocyte maturation and cartilage homeostasis.

Main Methods:

  • Investigated CCN1 induction by WNT/β-CATENIN signaling in primary chondrocytes and cartilage.
  • Utilized in vitro overexpression and inhibition of CCN1 in chondrocytes.
  • Generated a conditional transgenic mouse model for cartilage-specific CCN1 overexpression.
  • Analyzed CCN1 expression in mouse models of cartilage injury and human meniscal tears.

Main Results:

  • WNT/β-CATENIN signaling significantly induces CCN1 expression in chondrocytes and cartilage.
  • CCN1 overexpression promotes chondrocyte maturation in vitro, while CCN1 inhibition impairs it.
  • Cartilage-specific CCN1 overexpression in mice caused developmental chondrodysplasia and adult cartilage degeneration.
  • CCN1 expression is upregulated in cartilage following injury.

Conclusions:

  • CCN1 is a critical downstream target of WNT/β-CATENIN signaling in chondrocytes.
  • CCN1 plays a significant role in regulating chondrocyte maturation during skeletal development.
  • CCN1 is implicated in maintaining cartilage homeostasis and its dysregulation contributes to cartilage degeneration and injury response.