Breast Cancer Research and Treatment

, Volume 146, Issue 1, pp 41–50

The metastatic potential of triple-negative breast cancer is decreased via caloric restriction-mediated reduction of the miR-17~92 cluster

Authors

  • Lianjin Jin
    • Department of Radiation OncologyThomas Jefferson University
  • Meng Lim
    • Department of Radiation OncologyThomas Jefferson University
  • Shuping Zhao
    • Radiation Oncology Branch, National Cancer InstituteNIH
  • Yuri Sano
    • Department of Radiation OncologyThomas Jefferson University
  • Brittany A. Simone
    • Department of Radiation OncologyThomas Jefferson University
  • Jason E. Savage
    • Radiation Oncology Branch, National Cancer InstituteNIH
  • Eric Wickstrom
    • Department of Biochemistry & Molecular BiologyThomas Jefferson University
  • Kevin Camphausen
    • Radiation Oncology Branch, National Cancer InstituteNIH
  • Richard G. Pestell
    • Department of Cancer BiologyThomas Jefferson University
    • Department of Radiation OncologyThomas Jefferson University
Preclinical study

DOI: 10.1007/s10549-014-2978-7

Cite this article as:
Jin, L., Lim, M., Zhao, S. et al. Breast Cancer Res Treat (2014) 146: 41. doi:10.1007/s10549-014-2978-7

Abstract

Caloric restriction (CR) has been shown to cause tumor regression in models of triple-negative breast cancer (TNBC), and the regression is augmented when coupled with ionizing radiation (IR). In this study, we sought to determine if the molecular interaction between CR and IR could be mediated by microRNA (miR). miR arrays revealed 3 miRs in the miR-17~92 cluster as most significantly down regulated when CR is combined with IR. In vivo, CR and IR down regulated miR-17/20 in 2 TNBC models. To elucidate the mechanism by which this cluster regulates the response to CR, cDNA arrays were performed and the top 5 statistically significant gene ontology terms with high fold changes were all associated with extracellular matrix (ECM) and metastases. In silico analysis revealed 4 potential targets of the miR-17~92 cluster related to ECM: collagen 4 alpha 3, laminin alpha 3, and metallopeptidase inhibitors 2 and 3, which were confirmed by luciferase assays. The overexpression or silencing of miR-17/20a demonstrated that those miRs directly affected the ECM proteins. Furthermore, we found that CR-mediated inhibition of miR-17/20a can regulate the expression of ECM proteins. Functionally, we demonstrate that CR decreases the metastatic potential of cells which further demonstrates the importance of the ECM. In conclusion, CR can be used as a potential treatment for cancer because it may alter many molecular targets concurrently and decrease metastatic potential for TNBC.

Keywords

Caloric restrictionTriple-negative breast cancermicroRNAmiR-17~92 clusterRadiation

Abbreviations

TNBC

Triple-negative breast cancer

CR

Caloric restriction

IR

Radiation

ECM

Extracellular matrix

miR

microRNA

COL4A3

Collagen 4 alpha 3

LAMA3

Laminin alpha 3

TIMP2 and 3

Metallopeptidase inhibitors 2 and 3

Copyright information

© Springer Science+Business Media New York (outside the USA) 2014