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Mechanical factors activate beta-catenin-dependent oncogene expression in APC mouse colon
HFSP Journal
|May 1, 2009
Summary
Mechanical stress can trigger colon cancer initiation in preneoplastic tissues by activating beta-catenin signaling. This mechanical activation of oncogenes like Myc and Twist1 is preventable with Src kinase inhibitors.
Area of Science:
- Gastrointestinal oncology
- Mechanobiology
- Molecular biology
Background:
- Beta-catenin is crucial for gastrointestinal homeostasis and Wnt signaling, a pathway often dysregulated in colon cancer.
- Beta-catenin also mediates mechanotransduction, influencing gene expression in development and tissue maintenance.
- Genetic lesions activating Wnt signaling are hallmarks of colon cancer.
Purpose of the Study:
- To investigate the role of mechanical stimulation in initiating colon cancer.
- To understand how mechanical forces impact beta-catenin signaling in preneoplastic colon tissue.
Main Methods:
- Utilizing APC-deficient (APC(1638N+)) and wild-type colon tissue explants.
- Applying transient compression to tissue explants.
- Analyzing the expression of oncogenes Myc and Twist1.
- Investigating beta-catenin phosphorylation at tyrosine 654 and its nuclear localization.
- Using Src kinase inhibitors to block beta-catenin phosphorylation.
Main Results:
- Mechanical stimulation induced Myc and Twist1 expression in APC-deficient colon explants, but not in wild-type.
- Compression led to beta-catenin phosphorylation at Tyr654 and increased nuclear localization in APC-deficient tissue.
- Src kinase inhibitors prevented the mechanical activation of Myc and Twist1 expression.
- Mechanical strain acts as a signal for beta-catenin-dependent transcription in preneoplastic colon tissue with limited APC.
Conclusions:
- Mechanical forces, particularly in the context of limited APC, can initiate a cancer-promoting transcriptional program via beta-catenin.
- Intestinal mechanical strain may contribute to colon cancer initiation by activating oncogenic pathways.
- Targeting beta-catenin phosphorylation could be a strategy to prevent mechanically induced colon cancer.
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