Cancer and Metastasis Reviews

, Volume 25, Issue 4, pp 589–600 | Cite as

Regulatory roles of Runx2 in metastatic tumor and cancer cell interactions with bone

  • J. Pratap
  • J. B. Lian
  • A. Javed
  • G. L. Barnes
  • A. J. van Wijnen
  • J. L. Stein
  • G. S. Stein
Article

Abstract

The three mammalian Runt homology domain transcription factors (Runx1, Runx2, Runx3) support biological control by functioning as master regulatory genes for the differentiation of distinct tissues. Runx proteins also function as cell context-dependent tumor suppressors or oncogenes. Abnormalities in Runx mediated gene expression are linked to cell transformation and tumor progression. Runx2 is expressed in mesenchymal linage cells committed to the osteoblast phenotype and is essential for bone formation. This skeletal transcription factor is aberrantly expressed at high levels in breast and prostate tumors and cells that aggressively metastasize to the bone environment. In cancer cells, Runx2 activates expression of bone matrix and adhesion proteins, matrix metalloproteinases and angiogenic factors that have long been associated with metastasis. In addition, Runx2 mediates the responses of cells to signaling pathways hyperactive in tumors, including BMP/TGFβ and other growth factor signals. Runx2 forms co-regulatory complexes with Smads and other co-activator and co-repressor proteins that are organized in subnuclear domains to regulate gene transcription. These activities of Runx2 contribute to tumor growth in bone and the accompanying osteolytic disease, established by interfering with Runx2 functions in metastatic breast cancer cells. Inhibition of Runx2 in MDA-MB-231 cells transplanted to bone decreased tumorigenesis and prevented osteolysis. This review evaluates evidence that Runx2 regulates early metastatic events in breast and prostate cancers, tumor growth, and osteolytic bone disease. Consideration is given to the potential for inhibition of this transcription factor as a therapeutic strategy upstream of the regulatory events contributing to the complexity of metastasis to bone.

Keywords

Bone metastasis Osteolytic disease Osteolysis Breast cancer Prostate cancer Smads 

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • J. Pratap
    • 1
  • J. B. Lian
    • 1
  • A. Javed
    • 2
  • G. L. Barnes
    • 3
  • A. J. van Wijnen
    • 1
  • J. L. Stein
    • 1
  • G. S. Stein
    • 1
  1. 1.Department of Cell BiologyUniversity of Massachusetts Medical SchoolWorcesterUSA
  2. 2.Institute of Oral health research, School of DentistryUniversity of Alabama at BirminghamBirminghamUSA
  3. 3.Department of Orthopaedic SurgeryBoston University Medical CenterBostonUSA

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