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Notch inhibits expression of the Krüppel-like factor 4 tumor suppressor in the intestinal epithelium

Amr M Ghaleb1, Gaurav Aggarwal, Agnieszka B Bialkowska

  • 1Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, USA.

Molecular Cancer Research : MCR
|December 17, 2008
PubMed

Insights

Inhibition of Notch signaling boosts Krüppel-like factor 4 (KLF4) expression, promoting goblet cell differentiation and reducing intestinal tumor formation in mice. This highlights KLF4 as a mediator for Notch inhibitor efficacy.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Oncology

Background:

  • Krüppel-like factor 4 (KLF4) is a transcription factor that inhibits cell proliferation and is crucial for goblet cell differentiation in the intestine.
  • Notch signaling pathway is implicated in suppressing goblet cell formation and is often upregulated in intestinal tumors.
  • KLF4 haploinsufficiency in Apc(Min/+) mice accelerates intestinal tumorigenesis, suggesting a tumor-suppressive role.

Purpose of the Study:

  • To investigate the interplay between Notch signaling and KLF4 expression in intestinal epithelial cells.
  • To determine the effect of modulating Notch signaling on KLF4 levels, cell proliferation, and goblet cell differentiation.
  • To evaluate the therapeutic potential of inhibiting Notch signaling in a mouse model of intestinal tumorigenesis.

Main Methods:

  • Utilized HT29 human colon cancer cells treated with a gamma-secretase inhibitor (dibenzazepine) or small interfering RNA (siRNA) targeting Notch to assess proliferation and KLF4 levels.
  • Overexpressed Notch in HT29 cells to evaluate its impact on KLF4 expression and promoter activity.
  • Administered dibenzazepine to Apc(Min/+) mice to assess its effects on intestinal adenoma formation, goblet cell differentiation, and expression of KLF4, cyclin D1, and Ki-67.

Main Results:

  • Inhibition of Notch signaling in HT29 cells led to decreased proliferation and increased KLF4 levels.
  • Notch overexpression in HT29 cells reduced KLF4 levels, suppressed KLF4 promoter activity, and increased proliferation.
  • Dibenzazepine treatment in Apc(Min/+) mice significantly reduced intestinal adenoma number by 50% and increased goblet cell numbers and KLF4 staining in both normal mucosa and adenomas.

Conclusions:

  • Notch signaling actively suppresses KLF4 expression in intestinal tumors and colorectal cancer cells.
  • Inhibiting Notch signaling enhances KLF4 expression, promotes goblet cell differentiation, and reduces cell proliferation and tumor development.
  • KLF4 acts as a key mediator for the antitumor effects observed with Notch inhibitors like dibenzazepine.

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