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Kaiso is a bimodal modulator for Wnt/beta-catenin signaling

Hidekazu Iioka1, Stephanie K Doerner, Keiko Tamai

  • 1BRB 723, Department of Genetics, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA.

FEBS Letters
|January 27, 2009
PubMed

Insights

Kaiso protein acts as a dual regulator of Wnt signaling, impacting embryonic development and cancer. Its loss-of-function disrupts Wnt activity, while gain-of-function shows dose-dependent effects, offering insights into tumor resistance.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cancer Biology

Background:

  • The Wnt signaling pathway is crucial for embryonic development and is frequently dysregulated in cancer.
  • Kaiso is a DNA-binding protein with known roles in gene regulation.

Purpose of the Study:

  • To investigate the role of Kaiso in regulating canonical Wnt signaling.
  • To elucidate the molecular mechanisms by which Kaiso influences Wnt pathway activity.
  • To understand Kaiso's role in Wnt-mediated tumorigenesis and tumor suppression.

Main Methods:

  • Loss-of-function and gain-of-function analyses of Kaiso.
  • Wnt-mediated reporter gene assays.
  • Analysis of axis duplication in developmental models.
  • Investigation of Kaiso's interaction with HDAC1 and beta-catenin complexes.
  • Studies in Kaiso null mice crossed onto an Apc(Min/+) background.

Main Results:

  • Loss of Kaiso function abrogated Wnt-mediated reporter activity and axis duplication.
  • Gain-of-function analysis of Kaiso demonstrated dose-dependent synergistic and suppressive effects on Wnt signaling.
  • Kaiso appears to regulate TCF/LEF1 activity by modulating HDAC1 and beta-catenin complex formation.
  • Kaiso null mice exhibited resistance to intestinal tumors on an Apc(Min/+) background.

Conclusions:

  • Kaiso acts as a bimodal regulator of canonical Wnt signaling.
  • Kaiso's modulation of Wnt signaling involves interactions with HDAC1 and beta-catenin.
  • These findings provide a molecular basis for Kaiso's role in Wnt-dependent processes, including tumor suppression.

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