The Runx2 transcription factor plays a key role in the 1α,25- dihydroxy Vitamin D3-dependent upregulation of the rat osteocalcin (OC) gene expression in osteoblastic cells

Roberto Paredes, Gloria Arriagada, Fernando Cruzat, Juan Olate, Andre Van Wijnen, Jane Lian, Gary Stein, Janet Stein, Martin Montecino

Research output: Contribution to journalArticle

47 Scopus citations


Bone-specific transcription of the osteocalcin (OC) gene is principally regulated by the Runx2 transcription factor and further stimulated in response to 1α,25-dihydroxy Vitamin D3 via its specific receptor (VDR). The rat OC gene promoter contains three recognition sites for Runx2 (sites A-C). Mutation of sites A and B, which flank the 1α,25-dihydroxy Vitamin D3-responsive element (VDRE), abolishes 1α,25-dihydroxy Vitamin D3-dependent enhancement of OC transcription, indicating a tight functional relationship between VDR and Runx2 factors. Additionally, the transcriptional co-activator p300 is recruited to the OC promoter by Runx2 where it up-regulates both basal and 1α,25-dihydroxy Vitamin D3-enhanced OC expression. Here, we present an overview of how in osteoblastic cells expressing OC, Runx2 modulates the 1α,25-dihydroxy Vitamin D3-dependent stimulation of the OC promoter by first recruiting transcriptional co-activators and then by further stabilizing the interaction of the VDR with the VDRE.

Original languageEnglish (US)
Pages (from-to)269-271
Number of pages3
JournalJournal of Steroid Biochemistry and Molecular Biology
StatePublished - May 1 2004



  • Osteocalcin
  • Runx2
  • Transcription
  • Vitamin D

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Endocrinology
  • Clinical Biochemistry
  • Cell Biology

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