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Involvement of splicing factor-1 in beta-catenin/T-cell factor-4-mediated gene transactivation and pre-mRNA splicing

Miki Shitashige1, Yasuyoshi Naishiro, Masashi Idogawa

  • 1Chemotherapy Division and Cancer Proteomics Project, National Cancer Center Research Institute, Tokyo, Japan.

Gastroenterology
|March 27, 2007
PubMed
Abstract

Insights

Splicing Factor 1 (SF1) regulates beta-catenin/T-cell factor-4 (TCF4) complex activity in colorectal cancer. SF1 expression impacts cell differentiation and tumorigenesis, revealing a novel Wnt signaling pathway mechanism.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Beta-catenin is a key effector in Wnt signaling, implicated in colorectal carcinogenesis.
  • The precise mechanism of beta-catenin's oncogenic function, particularly its role in gene activation and splicing, is not fully understood.
  • Previous work identified the beta-catenin/T-cell factor-4 (TCF4) complex's involvement in pre-messenger RNA splicing.

Purpose of the Study:

  • To identify effector molecules regulated by the beta-catenin/TCF4 complex in colorectal cancer.
  • To elucidate the role of Splicing Factor 1 (SF1) in beta-catenin-mediated gene regulation and colorectal tumorigenesis.

Main Methods:

  • Isotope-coded affinity tagging and mass spectrometry were used to identify proteins regulated by the beta-catenin/TCF4 complex in colorectal cancer cells.
  • Immunoprecipitation and immunofluorescence microscopy were employed to study SF1 protein interactions and localization.
  • Complementary DNA transfection was used to assess the functional impact of SF1 on gene transactivation and cell proliferation.

Main Results:

  • Splicing Factor 1 (SF1) expression was identified as being regulated by the beta-catenin/TCF4 complex.
  • SF1 expression correlated with intestinal epithelial cell differentiation and inversely with tumorigenesis.
  • SF1 negatively regulated beta-catenin-mediated gene transactivation and cell proliferation, and was essential for beta-catenin/TCF4-induced alternative splicing, including cancer-related splice variants.

Conclusions:

  • The beta-catenin/TCF4 complex regulates SF1 protein levels.
  • SF1 interacts with the beta-catenin/TCF4 complex and modulates its gene transactivation and pre-messenger RNA splicing activities.
  • This interaction provides novel insights into the Wnt signaling pathway's role in colorectal cancer.

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