Notch4 Signaling Induces a Mesenchymal-Epithelial-like Transition in Melanoma Cells to Suppress Malignant Behaviors

Ehsan Bonyadi Rad, Heinz Hammerlindl, Christian Wels, Ulrich Popper, Dinoop Ravindran Menon, Heimo Breiteneder, Melitta Kitzwoegerer, Christine Hafner, Meenhard Herlyn, Helmut Bergler, Helmut Schaider

Research output: Journal article (peer-reviewed)Journal article

37 Citations (Scopus)

Abstract

The effects of Notch signaling are context-dependent and both oncogenic and tumor-suppressive functions have been described. Notch signaling in melanoma is considered oncogenic, but clinical trials testing Notch inhibition in this malignancy have not proved successful. Here, we report that expression of the constitutively active intracellular domain of Notch4 (N4ICD) in melanoma cells triggered a switch from a mesenchymal-like parental phenotype to an epithelial-like phenotype. The epithelial-like morphology was accompanied by strongly reduced invasive, migratory, and proliferative properties concomitant with the downregulation of epithelial-mesenchymal transition markers Snail2 (SNAI2), Twist1, vimentin (VIM), and MMP2 and the reexpression of E-cadherin (CDH1). The N4ICD-induced phenotypic switch also resulted in significantly reduced tumor growth in vivo Immunohistochemical analysis of primary human melanomas and cutaneous metastases revealed a significant correlation between Notch4 and E-cadherin expression. Mechanistically, we demonstrate that N4ICD induced the expression of the transcription factors Hey1 and Hey2, which bound directly to the promoter regions of Snail2 and Twist1 and repressed gene transcription, as determined by EMSA and luciferase assays. Taken together, our findings indicate a role for Notch4 as a tumor suppressor in melanoma, uncovering a potential explanation for the poor clinical efficacy of Notch inhibitors observed in this setting. Cancer Res; 76(7); 1690-7. ©2016 AACR.

Original languageEnglish
Pages (from-to)1690-1697
Number of pages8
JournalCancer Research
Volume76
Issue number7
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • Epithelial-Mesenchymal Transition/physiology
  • Humans
  • Melanoma/genetics
  • Proto-Oncogene Proteins/genetics
  • Receptor, Notch4
  • Receptors, Notch/genetics
  • Signal Transduction
  • Skin Neoplasms/genetics

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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