Enhanced expression of retinoic acid receptor alpha (RARA) induces epithelial-to-mesenchymal transition and disruption of mammary acinar structures

Ayano Doi, Kosuke Ishikawa, Nao Shibata, Emi Ito, Jiro Fujimoto, Mizuki Yamamoto, Hatsuki Shiga, Hiromi Mochizuki, Yoshifumi Kawamura, Naoki Goshima, Kentaro Semba, Shinya Watanabe

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

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 α (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.

Original languageEnglish
Pages (from-to)355-364
Number of pages10
JournalMolecular Oncology
Volume9
Issue number2
DOIs
Publication statusPublished - 2015 Feb 1

Keywords

  • 3D culture
  • Breast cancer
  • EMT
  • ERBB2
  • Gene amplification
  • RARA

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Oncology
  • Cancer Research

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