Related Experiment Video

Updated: Sep 30, 2025

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

9.7K

Smad4 and p53 synergize in suppressing autochthonous intestinal cancer

Jun Won Park1,2, Min-Jung Seo1, Kye Soo Cho1,3

  • 1National Cancer Center, Goyang, Republic of Korea.

Cancer Medicine
|March 11, 2022
PubMed
Abstract

Insights

Smad4 and p53 mutations synergistically drive intestinal cancer by downregulating p21 and activating the Wnt pathway. Targeting Wnt signaling with inhibitors like CWP232291 suppressed tumor growth and cancer stem cells.

Area of Science:

  • Oncology
  • Gastroenterology
  • Molecular Biology

Background:

  • Colorectal cancers (CRCs) frequently harbor mutations in Smad4 and p53.
  • The synergistic role of these common mutations in intestinal carcinogenesis remains incompletely understood.

Purpose of the Study:

  • To investigate the synergistic effects of Smad4 and p53 loss in intestinal carcinogenesis.
  • To elucidate the molecular mechanisms underlying this synergy.

Main Methods:

  • Generation of novel autochthonous mouse models (Villin-Cre;Smad4F/F;Trp53F/F) to recapitulate human CRCs.
  • Comparative analysis of intestinal phenotypes and molecular markers between different genetically modified mouse groups.
  • Treatment with a small-molecule Wnt inhibitor (CWP232291) and a Bcl-XL antagonist (BH3I-1) to assess therapeutic efficacy.

Main Results:

  • Villin-Cre;Smad4F/F;Trp53F/F mice developed spontaneous, highly proliferative intestinal tumors and adenocarcinomas.
  • Loss of Smad4 and p53 led to p21 downregulation and Wnt/β-catenin pathway activation.
  • Wnt inhibition suppressed tumor progression, reduced cancer stem cell (CSC) markers (CD133, Lgr-5, Sca-1), and decreased CSC frequency.
  • Bcl-XL antagonism further inhibited intestinal CSCs.

Conclusions:

  • Smad4 and p53 loss act synergistically in driving intestinal carcinogenesis.
  • The synergistic effect involves p21 downregulation and Wnt/β-catenin pathway activation.
  • Targeting the Wnt pathway and Bcl-XL shows therapeutic potential against Smad4/p53-mutated colorectal cancers.

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