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Alterations in beta-catenin expression and localization in prostate cancer
Hayley C Whitaker1, Joanne Girling, Anne Y Warren
1Uro-Oncology Research Group, Cancer Research UK Cambridge Research Institute, Li Ka Shing Centre, Robinson Way, Cambridge, UK. hayley.whitaker@cancer.org.uk
The Prostate
|May 7, 2008
Summary
Loss of nuclear beta-catenin, not overall expression levels, is a key indicator in prostate cancer progression. Immunohistochemical protocol variations may explain differing research findings on beta-catenin in cancer.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Wnt signaling pathway involvement in prostate cancer is linked to beta-catenin affecting androgen receptor signaling.
- Beta-catenin's role in cell adhesion complex with E-cadherin suggests potential links to metastasis.
- Altered beta-catenin expression or localization is investigated as a prostate cancer biomarker.
Purpose of the Study:
- To investigate beta-catenin expression and distribution in benign prostatic hyperplasia and prostate cancer.
- To assess the impact of hormone manipulation on beta-catenin.
- To evaluate the influence of immunohistochemical protocols on beta-catenin detection.
Main Methods:
- Immunohistochemistry on tissue microarrays of prostate tissues (BPH, low, moderate, high-grade cancer).
- Analysis of tissues before and after hormone manipulation.
- Assessment of fixation and antibody variations on cell pellets and tissue microarrays.
Main Results:
- Increased beta-catenin expression observed only in high Gleason score (>7) prostate cancer.
- Nuclear beta-catenin present in benign prostatic hyperplasia, with gradual loss in higher Gleason grades.
- No significant alteration in beta-catenin expression or distribution with hormone ablation; protocol variations impact staining.
Conclusions:
- Loss of nuclear beta-catenin is a more consistent feature in prostate cancer than absolute expression levels.
- Variations in immunohistochemical protocols may account for discrepancies in published literature regarding beta-catenin.
- Nuclear beta-catenin loss correlates with increasing Gleason grade in prostate cancer.
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