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Breast Cancer Research
Published in: Breast Cancer Research 5/2010

Open Access 01-10-2010 | Research article

Cancer-related ectopic expression of the bone-related transcription factor RUNX2 in non-osseous metastatic tumor cells is linked to cell proliferation and motility

Authors: David T Leong, Joleen Lim, Xuewei Goh, Jitesh Pratap, Barry P Pereira, Hui Si Kwok, Saminathan Suresh Nathan, Jason R Dobson, Jane B Lian, Yoshiaki Ito, P Mathijs Voorhoeve, Gary S Stein, Manuel Salto-Tellez, Simon M Cool, Andre J van Wijnen

Published in: Breast Cancer Research | Issue 5/2010

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Abstract

Introduction

Metastatic breast cancer cells frequently and ectopically express the transcription factor RUNX2, which normally attenuates proliferation and promotes maturation of osteoblasts. RUNX2 expression is inversely regulated with respect to cell growth in osteoblasts and deregulated in osteosarcoma cells.

Methods

Here, we addressed whether the functional relationship between cell growth and RUNX2 gene expression is maintained in breast cancer cells. We also investigated whether the aberrant expression of RUNX2 is linked to phenotypic parameters that could provide a selective advantage to cells during breast cancer progression.

Results

We find that, similar to its regulation in osteoblasts, RUNX2 expression in MDA-MB-231 breast adenocarcinoma cells is enhanced upon growth factor deprivation, as well as upon deactivation of the mitogen-dependent MEK-Erk pathway or EGFR signaling. Reduction of RUNX2 levels by RNAi has only marginal effects on cell growth and expression of proliferation markers in MDA-MB-231 breast cancer cells. Thus, RUNX2 is not a critical regulator of cell proliferation in this cell type. However, siRNA depletion of RUNX2 in MDA-MB-231 cells reduces cell motility, while forced exogenous expression of RUNX2 in MCF7 cells increases cell motility.

Conclusions

Our results support the emerging concept that the osteogenic transcription factor RUNX2 functions as a metastasis-related oncoprotein in non-osseous cancer cells.
Appendix
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Metadata
Title
Cancer-related ectopic expression of the bone-related transcription factor RUNX2 in non-osseous metastatic tumor cells is linked to cell proliferation and motility
Authors
David T Leong
Joleen Lim
Xuewei Goh
Jitesh Pratap
Barry P Pereira
Hui Si Kwok
Saminathan Suresh Nathan
Jason R Dobson
Jane B Lian
Yoshiaki Ito
P Mathijs Voorhoeve
Gary S Stein
Manuel Salto-Tellez
Simon M Cool
Andre J van Wijnen
Publication date
01-10-2010
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 5/2010
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr2762

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