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Notch1 counteracts WNT/β-catenin signaling through chromatin modification in colorectal cancer

Hyun-A Kim1, Bon-Kyoung Koo, Ji-Hoon Cho

  • 1Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea.

The Journal of Clinical Investigation
|August 7, 2012
PubMed

Insights

Notch1 signaling suppresses WNT target genes in colorectal cancer, even when normal feedback is disrupted. This unexpected finding reveals Notch1

Area of Science:

  • Molecular biology
  • Cancer research
  • Signaling pathways

Background:

  • Notch and WNT/β-catenin signaling pathways crosstalk is crucial in development.
  • Negative feedback loops typically regulate these pathways in normal physiology.
  • Colorectal cancer often involves dysregulated WNT/β-catenin signaling.

Purpose of the Study:

  • To investigate the role of Notch1 signaling in colorectal cancer.
  • To determine if Notch1 can suppress WNT target gene expression in cancer.
  • To elucidate the mechanism of Notch1's action in colorectal cancer.

Main Methods:

  • Studied Notch1's effect on WNT target genes in colorectal cancer cells.
  • Utilized an Apcmin mouse colon cancer model to assess Notch1 activation.
  • Investigated epigenetic modifications involving SETDB1 recruitment.
  • Performed microarray analysis of human colorectal cancers.

Main Results:

  • Notch1 suppressed WNT target gene expression in colorectal cancer cells, irrespective of APC complex function.
  • Notch1 activation reduced adenoma grade in a mouse model.
  • Notch1 recruited SETDB1 for epigenetic suppression of WNT target genes.
  • A negative correlation was observed between Notch1 and WNT target genes in human tumors.

Conclusions:

  • Notch1 exhibits an unexpected suppressive role on WNT/β-catenin target genes in colorectal cancer.
  • Notch1 can counteract WNT-driven tumorigenesis through epigenetic mechanisms.
  • Targeting Notch1 may offer a novel therapeutic strategy for colorectal cancer.

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