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06:01
A Genetically Engineered Mouse Model of Sporadic Colorectal Cancer
Published on: July 6, 2017
Mice expressing activated PI3K rapidly develop advanced colon cancer
Alyssa A Leystra1, Dustin A Deming, Christopher D Zahm
1Department of Oncology, University of Wisconsin, Madison 53792, USA.
Cancer Research
|April 25, 2012
Summary
Constitutively active phosphoinositide 3-kinase (PI3K) in mouse intestines caused invasive colon cancer, challenging previous notions of tumor initiation. This study reveals a novel PI3K-mediated pathway for colon tumor development.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Aberrant phosphoinositide 3-kinase (PI3K) signaling is implicated in various cancers.
- PI3K mutations are common in colorectal cancers, but their role in tumor initiation is debated.
- The impact of activated PI3K on intestinal mucosa has not been studied in vivo.
Purpose of the Study:
- To investigate the effects of constitutively active PI3K in the mouse intestinal epithelium.
- To determine if activated PI3K can initiate colon tumor formation.
- To establish a novel animal model for studying PI3K-driven colon cancer.
Main Methods:
- Expression of a constitutively active PI3K in the epithelial cells of mouse distal small bowel and colon.
- Histological analysis of tumor development and characteristics.
- Comparison of tumor histology with human colorectal cancers.
Main Results:
- Constitutively active PI3K expression led to intestinal hyperplasia and advanced neoplasia.
- Mice rapidly developed invasive adenocarcinomas in the colon with metastasis.
- Tumors exhibited histological similarities to human invasive mucinous colon cancers.
- Tumor formation occurred without a benign polypoid stage, independent of WNT signaling.
Conclusions:
- Activated PI3K can initiate colon tumor formation through a noncanonical mechanism.
- This mouse model mimics key features of human invasive colon cancer.
- The model provides a platform for therapeutic development and biomarker discovery in PI3K-driven cancers.
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