RUNX2 correlates with subtype-specific breast cancer in a human tissue microarray, and ectopic expression of Runx2 perturbs differentiation in the mouse mammary gland

McDonald, L. et al. (2014) RUNX2 correlates with subtype-specific breast cancer in a human tissue microarray, and ectopic expression of Runx2 perturbs differentiation in the mouse mammary gland. Disease Models and Mechanisms, 7(5), pp. 525-534. (doi:10.1242/dmm.015040)

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Abstract

RUNX2, a master regulator of osteogenesis, is oncogenic in the lymphoid lineage; however, little is known about its role in epithelial cancers. Upregulation of RUNX2 in cell lines correlates with increased invasiveness and the capacity to form osteolytic disease in models of breast and prostate cancer. However, most studies have analysed the effects of this gene in a limited number of cell lines and its role in primary breast cancer has not been resolved. Using a human tumour tissue microarray, we show that high RUNX2 expression is significantly associated with oestrogen receptor (ER)/progesterone receptor (PR)/HER2-negative breast cancers and that patients with high RUNX2 expression have a poorer survival rate than those with negative or low expression. We confirm RUNX2 as a gene that has a potentially important functional role in triple-negative breast cancer. To investigate the role of this gene in breast cancer, we made a transgenic model in which Runx2 is specifically expressed in murine mammary epithelium under the control of the mouse mammary tumour virus (MMTV) promoter. We show that ectopic Runx2 perturbs normal development in pubertal and lactating animals, delaying ductal elongation and inhibiting lobular alveolar differentiation. We also show that the Runx2 transgene elicits age-related, pre-neoplastic changes in the mammary epithelium of older transgenic animals, suggesting that elevated RUNX2 expression renders such tissue more susceptible to oncogenic changes and providing further evidence that this gene might have an important, context-dependent role in breast cancer.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Orange, Miss Clare and Gusterson, Professor Barry and Bell, Mrs Margaret and Blyth, Professor Karen and Cameron, Professor Ewan and Mohammed, Dr Zahra and McDonald, Dr Laura and Edwards, Professor Joanne and Ferrari, Mr Nicola and Neil, Professor James and Morris, Professor Joanna and Terry, Mrs Anne
Authors: McDonald, L., Ferrari, N., Terry, A., Bell, M., Mohammed, Z. M., Orange, C., Jenkins, A., Muller, W. J., Gusterson, B. A., Neil, J. C., Edwards, J., Morris, J. S., Cameron, E. R., and Blyth, K.
Subjects:Q Science > Q Science (General)
R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
College/School:College of Medical Veterinary and Life Sciences > Institute of Cancer Sciences
Journal Name:Disease Models and Mechanisms
Publisher:The Company of Biologists Ltd.
ISSN:1754-8411
ISSN (Online):1754-8403
Copyright Holders:Copyright © 2014 The Authors
First Published:First published in Disease Models and Mechanisms 7(5):525-534
Publisher Policy:Reproduced under a Creative Commons License
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