Journal
MOLECULAR ONCOLOGY
Volume 9, Issue 2, Pages 355-364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.molonc.2014.09.005
Keywords
3D culture; Gene amplification; Breast cancer; EMT; ERBB2; RARA
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Funding
- Japan Society for the Promotion of Science KAKENHI [23241064]
- New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [23241064] Funding Source: KAKEN
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The early steps of mammary tumorigenesis include loss of epithelial cell polarity, escape from anoikis, and acquisition of proliferative capacity. The genes responsible for these processes are predicted to be early diagnostic markers or new therapeutic targets. Here we tested 51 genes coamplified with ERBB2 in the 17q12-21 amplicon for these tumorigenic activities using an MCF10A 3D culture-based screening system. We found that overexpression of retinoic acid receptor alpha (RARA) disrupted normal acinar structure and induced epithelial-to-mesenchymal transition (EMT). The mRNA levels of known EMT-inducing factors, including SLUG, FOXC2, ZEB1, and ZEB2, were significantly increased upon RARA overexpression. Knockdown of ZEB1 suppressed the RARA-mediated EMT phenotype. These results suggest that overexpression of RARA enhances malignant transformation during mammary tumorigenesis. (C) 2014 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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