Dose-dependent induction of distinct phenotypic responses to Notch pathway activation in mammary epithelial cells

Marco Mazzone, Laura M. Selfors, John Albeck, Michael Overholtzer, Sanja Sale, Danielle L. Carroll, Darshan Pandya, Yiling Lu, Gordon B. Mills, Jon C. Aster, Spyros Artavanis-Tsakonas, Joan S. Brugge

Research output: Contribution to journalArticlepeer-review

131 Scopus citations


Aberrant activation of Notch receptors has been implicated in breast cancer; however, the mechanisms contributing to Notch-dependent transformation remain elusive because Notch displays dichotomous functional activities, promoting both proliferation and growth arrest. We investigated the cellular basis for the heterogeneous responses to Notch pathway activation in 3D cultures of MCF-10A mammary epithelial cells. Expression of a constitutively active Notch-1 intracellular domain (NICD) was found to induce two distinct types of 3D structures: large, hyperproliferative structures and small, growth-arrested structures with reduced cell-to-matrix adhesion. Interestingly, we found that these heterogeneous phenotypes reflect differences in Notch pathway activation levels; high Notch activity caused down-regulation of multiple matrix-adhesion genes and inhibition of proliferation, whereas low Notch activity maintained matrix adhesion and provoked a strong hyperproliferative response. Moreover, microarray analyses implicated NICD-induced p63 down-regulation in loss of matrix adhesion. In addition, a reverse-phase protein array-based analysis and subsequent loss-of-function studies identified STAT3 as a dominant downstream mediator of the NICD-induced outgrowth. These results indicate that the phenotypic responses to Notch are determined by the dose of pathway activation; and this dose affects the balance between growth-stimulative and growth-suppressive effects. This unique feature of Notch signaling provides insights into mechanisms that contribute to the dichotomous effects of Notch during development and tumorigenesis.

Original languageEnglish (US)
Pages (from-to)5012-5017
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number11
StatePublished - Mar 16 2010
Externally publishedYes


  • Adhesion
  • Breast
  • Matrix
  • Morphogenesis
  • Transformation

ASJC Scopus subject areas

  • General


Dive into the research topics of 'Dose-dependent induction of distinct phenotypic responses to Notch pathway activation in mammary epithelial cells'. Together they form a unique fingerprint.

Cite this