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Pre-clinical Orthotopic Murine Model of Human Prostate Cancer
Published on: August 29, 2016
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Notch promotes tumor metastasis in a prostate-specific Pten-null mouse model
The Journal of Clinical Investigation
|June 14, 2016
Summary
Notch signaling in prostate cancer correlates with metastasis and poor survival. While not essential for cancer initiation, increased Notch activity promotes tumor spread and seminal vesicle changes, suggesting it as a therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Signaling Pathways
Background:
- Notch signaling is frequently deregulated in prostate cancer, but its precise role in disease progression remains unclear.
- Existing research indicates a correlation between elevated Notch signaling and increased metastatic potential and reduced survival rates in prostate cancer patients.
Purpose of the Study:
- To investigate the functional role of Notch signaling in prostate cancer initiation, progression, and metastasis using a preclinical mouse model.
- To determine if Notch signaling influences response to androgen deprivation therapy and affects other prostate tissues.
Main Methods:
- Analysis of two human prostate cancer datasets to correlate Notch signaling levels with clinical outcomes.
- Utilized the Pten-null mouse model of prostate cancer, involving disruption of the RBPJ transcription factor to modulate canonical Notch signaling.
- Assessed the impact of Notch pathway augmentation on tumor proliferation, apoptosis, DNA damage response (p53 activation), epithelial-mesenchymal transition (EMT), metastasis, and seminal vesicle transformation.
Main Results:
- Higher Notch signaling correlated with increased metastatic potential and worse survival in human prostate cancer data.
- Endogenous Notch signaling was not required for prostate cancer initiation or progression in the Pten-null model.
- Augmented Notch activity reduced primary tumor burden by increasing proliferation and apoptosis (linked to p53 activation) but promoted FOXC2-dependent metastasis and seminal vesicle epithelial cell transformation.
- Notch activation did not confer resistance to androgen deprivation therapy.
Conclusions:
- Notch signaling plays a complex, multifaceted role in prostate cancer, promoting metastasis and seminal vesicle changes.
- Despite reducing primary tumor burden, Notch activation enhances metastatic potential, highlighting its dual role.
- Notch signaling represents a potential therapeutic target for managing metastatic prostate cancer.
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