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New target genes for NOV/CCN3 in chondrocytes: TGF-beta2 and type X collagen

Jerome Lafont1, Claire Jacques, Gwenvael Le Dreau

  • 1INSERM U515, Hôpital Saint-Antoine, Paris Cedex 12, France.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|November 19, 2005
PubMed
Abstract

Insights

NOV/CCN3 (Nov) protein promotes chondrocyte differentiation by upregulating TGF-beta2 and type X collagen. This study reveals Nov as a key positive modulator in chondrogenesis, acting downstream of TGF-beta1 signaling.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biochemistry

Background:

  • NOV/CCN3 (Nov) is a matricellular protein implicated in cell differentiation, particularly chondrogenesis.
  • NOV expression is regulated during cartilage development and associated with cartilage differentiation in tumors.
  • The precise role and target genes of NOV in chondrogenesis remain largely unknown.

Purpose of the Study:

  • To investigate the function of NOV/CCN3 in chondrocyte differentiation.
  • To identify downstream targets of NOV during chondrogenesis.
  • To elucidate the relationship between NOV and TGF-beta signaling in cartilage formation.

Main Methods:

  • Quantitative RT-PCR was used to assess gene expression in ATDC5 cells and primary chondrocytes treated with NOV recombinant protein or NOV-specific siRNA.
  • Stable ATDC5 cell lines expressing NOV were generated.
  • The effect of NOV on TGF-beta1 signaling was investigated.

Main Results:

  • NOV/CCN3 expression increased during early chondrogenic differentiation in ATDC5 cells, preceding markers like TGF-beta2 and type X collagen.
  • Exogenous NOV upregulated TGF-beta2 and type X collagen mRNA in ATDC5 cells and primary chondrocytes.
  • NOV downregulation inhibited endogenous TGF-beta2 and type X collagen, and NOV expression was reduced by TGF-beta1 treatment.

Conclusions:

  • NOV/CCN3 positively modulates chondrogenesis.
  • NOV/CCN3 upregulates TGF-beta2 and type X collagen, identifying them as novel targets.
  • NOV acts as a downstream effector of TGF-beta1 in a gene regulatory cascade during chondrogenesis.

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