Vital roles of β-catenin in trans-differentiation of chondrocytes to bone cells

Yan Jing, Junjun Jing, Ke Wang, Kevin Chan, Stephen E. Harris, Robert J. Hinton, Jian Q. Feng

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A recent breakthrough showing that direct trans-differentiation of chondrocytes into bone cells commonly occurs during endochondral bone formation in the growth plate, articular cartilage, and mandibular condylar cartilage suggests that chondrogenesis and osteogenesis are likely one continuous biological process instead of two separate processes. Yet, gene regulation of this cell transformation is largely unclear. Here, we employed cartilage-specific β-catenin loss-of-function (β-cateninfx/fx) and gain-of-function (β-cateninfx(exon3)/ fx(exon3)) models in the R26RTomato background (for better tracing the cell fate of chondrocytes) to study the role of β-catenin in cell trans-differentiation. Using histological, immunohistochemical, and radiological methods combined with cell lineage tracing techniques, we showed that deletion of β-catenin by either Acan-CreERT2 or Col10a1-Cre resulted in greatly reduced cell trans-differentiation with a significant decrease in subchondral bone volume during mandibular condylar growth. Molecular studies demonstrated severe defects in cell proliferation and differentiation in both chondrocytes and bone cells. The gain of function studies (constitutive activation of β-catenin with Acan-CreERT2 at ages of postnatal day 7, 4-weeks and 6-months) led to more bone cell trans-differentiation of chondrocytes in the mandibular condyle due to increased proliferation and accelerated chondrocyte differentiation with incipient osteogenic changes within the cartilage matrix, resulting in an increased volume of poorly-formed immature subchondral bone. These results support the notion that chondrogenesis and osteogenesis are one continuous process, in which β-catenin signaling plays an essential role in the cell trans-differentiation of chondrocytes into bone cells during mandibular condylar development and growth.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalInternational Journal of Biological Sciences
Volume14
Issue number1
DOIs
StatePublished - Jan 1 2018

Keywords

  • Cartilage
  • Cell signaling
  • Chondrocyte
  • Growth/development
  • Osteoblast

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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  • Cite this

    Jing, Y., Jing, J., Wang, K., Chan, K., Harris, S. E., Hinton, R. J., & Feng, J. Q. (2018). Vital roles of β-catenin in trans-differentiation of chondrocytes to bone cells. International Journal of Biological Sciences, 14(1), 1-9. https://doi.org/10.7150/ijbs.23165