Targeting EZH2 reactivates a breast cancer subtype-specific anti-metastatic transcriptional program

Nat Commun. 2018 Jun 29;9(1):2547. doi: 10.1038/s41467-018-04864-8.

Abstract

Emerging evidence has illustrated the importance of epigenomic reprogramming in cancer, with altered post-translational modifications of histones contributing to pathogenesis. However, the contributions of histone modifiers to breast cancer progression are unclear, and how these processes vary between molecular subtypes has yet to be adequately addressed. Here we report that genetic or pharmacological targeting of the epigenetic modifier Ezh2 dramatically hinders metastatic behaviour in both a mouse model of breast cancer and patient-derived xenografts reflective of the Luminal B subtype. We further define a subtype-specific molecular mechanism whereby EZH2 maintains H3K27me3-mediated repression of the FOXC1 gene, thereby inactivating a FOXC1-driven, anti-invasive transcriptional program. We demonstrate that higher FOXC1 is predictive of favourable outcome specifically in Luminal B breast cancer patients and establish the use of EZH2 methyltransferase inhibitors as a viable strategy to block metastasis in Luminal B breast cancer, where options for targeted therapy are limited.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antineoplastic Agents / pharmacology
  • Breast Neoplasms / drug therapy*
  • Breast Neoplasms / genetics
  • Breast Neoplasms / mortality
  • Breast Neoplasms / pathology
  • Cell Line, Tumor
  • Doxycycline / pharmacology
  • Enhancer of Zeste Homolog 2 Protein / antagonists & inhibitors
  • Enhancer of Zeste Homolog 2 Protein / deficiency
  • Enhancer of Zeste Homolog 2 Protein / genetics*
  • Enzyme Inhibitors / pharmacology
  • Female
  • Forkhead Transcription Factors / agonists
  • Forkhead Transcription Factors / genetics*
  • Forkhead Transcription Factors / metabolism
  • Gene Expression Regulation, Neoplastic*
  • Histones / genetics*
  • Histones / metabolism
  • Humans
  • Indoles / pharmacology*
  • Lung Neoplasms / drug therapy*
  • Lung Neoplasms / genetics
  • Lung Neoplasms / mortality
  • Lung Neoplasms / secondary
  • Mice
  • Mice, Knockout
  • Molecular Targeted Therapy
  • Protein Processing, Post-Translational
  • Pyridones / pharmacology*
  • Signal Transduction
  • Transcription, Genetic
  • Xenograft Model Antitumor Assays

Substances

  • Antineoplastic Agents
  • Enzyme Inhibitors
  • FOXC1 protein, human
  • Forkhead Transcription Factors
  • GSK-2816126
  • Histones
  • Indoles
  • Pyridones
  • EZH2 protein, human
  • Enhancer of Zeste Homolog 2 Protein
  • Doxycycline