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Regulation of Tcf7 by Runx2 in chondrocyte maturation and proliferation

Masaki Mikasa1, Satoshi Rokutanda, Hisato Komori

  • 1Department of Cell Biology, Unit of Basic Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan.

Journal of Bone and Mineral Metabolism
|October 5, 2010
PubMed

Insights

Runx2 transcription factor regulates chondrocyte maturation and proliferation by inducing Tcf7. This study identifies Tcf7 as a key target molecule in Runx2-mediated skeletal development.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Runx2 is crucial for chondrocyte differentiation and proliferation, but its target genes remain largely unknown.
  • Understanding Runx2 targets is essential for elucidating skeletal development mechanisms.

Purpose of the Study:

  • To identify novel Runx2 target genes involved in chondrogenesis.
  • To investigate the role of Tcf7, a Tcf/Lef family member, as a Runx2 target in skeletal development.

Main Methods:

  • Microarray analysis to identify genes upregulated by Runx2.
  • Reporter assays to confirm Runx2-mediated transcriptional activation of Tcf7.
  • Generation of dominant-negative Tcf7 transgenic mice to assess in vivo function.
  • In situ hybridization and BrdU labeling to analyze chondrocyte maturation and proliferation.

Main Results:

  • Tcf7 and Lef1 were identified as direct targets of Runx2 in chondrocytes.
  • Runx2 directly activated Tcf7 transcription via a 0.3-kb promoter region.
  • Dominant-negative Tcf7 transgenic mice exhibited dwarfism, retarded mineralization, and impaired endochondral ossification.
  • Reduced chondrocyte proliferation and maturation were observed in Tcf7-deficient embryos.

Conclusions:

  • Runx2 regulates chondrocyte maturation and proliferation, at least partly, through the induction of Tcf7.
  • Tcf7 is a novel downstream target of Runx2 critical for skeletal development.
  • These findings provide new insights into the molecular pathways governing bone formation.

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