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Wnt/β-catenin activation promotes prostate tumor progression in a mouse model
1Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA.
Oncogene
|December 15, 2010
Summary
Wnt/β-catenin signaling drives mouse prostatic intraepithelial neoplasia (mPIN) progression to invasive prostate adenocarcinoma. This pathway impacts Foxa2, MMP7, and androgen receptor (AR) signaling, but does not cause neuroendocrine cancer.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Wnt/β-catenin signaling activation is linked to mouse prostatic intraepithelial neoplasia (mPIN).
- SV40-large T-antigen (LPB-Tag) expression in mouse prostate leads to mPIN with rare adenocarcinoma.
- The role of Wnt/β-catenin in mPIN progression to adenocarcinoma requires further investigation.
Purpose of the Study:
- To investigate the role of Wnt/β-catenin signaling in the progression from mPIN to prostate adenocarcinoma.
- To determine the impact of combined Wnt/β-catenin activation and Tag expression on prostate cancer development.
- To analyze the expression of Foxa2, MMP7, and the androgen receptor (AR) pathway in this context.
Main Methods:
- Utilized a mouse model expressing LPB-Tag and dominant active (DA) β-catenin.
- Performed histological analysis of prostate tissues.
- Assessed gene and protein expression, including Foxa2, MMP7, and AR signaling components.
Main Results:
- Co-activation of Tag and Wnt/β-catenin pathway induced invasive prostate adenocarcinoma.
- Active Wnt/β-catenin signaling upregulated Foxa2 and MMP7, with Foxa2 associated with invasiveness.
- Androgen receptor (AR) protein and AR signaling pathway were downregulated in LPB-Tag/DA β-catenin mice.
- Neuroendocrine differentiation (NED) was observed, but neuroendocrine cancer did not develop.
Conclusions:
- Wnt/β-catenin signaling is crucial for the progression of mPIN to prostate adenocarcinoma.
- Foxa2 induction by Wnt/β-catenin signaling correlates with invasive phenotypes.
- Wnt/β-catenin signaling can suppress AR signaling in vivo, despite in vitro co-activation roles.
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