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p300 in prostate cancer proliferation and progression
Jose D Debes1, Thomas J Sebo, Christine M Lohse
1Departments of Urology, Mayo Clinic and Foundation, Rochester, MN 55905, USA.
Cancer Research
|November 25, 2003
Summary
p300 protein is crucial for prostate cancer (PCa) cell proliferation and progression. High p300 levels in biopsies predict more aggressive tumors and poorer outcomes after surgery.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Prostate cancer (PCa) is a common male cancer with poorly understood progression mechanisms.
- Androgen receptor coactivators, including p300, are implicated in PCa progression.
- Previous work demonstrated p300's role in androgen receptor transactivation.
Purpose of the Study:
- To investigate the role of p300 in PCa progression and proliferation.
- To correlate p300 expression with clinical and pathological features of PCa.
- To assess the effect of p300 inhibition on PCa cell growth.
Main Methods:
- Analysis of p300 expression in 95 prostatectomy biopsy samples.
- Correlation of p300 levels with MIB-I proliferation index.
- Assessment of p300 association with tumor volume, extraprostatic extension, and seminal vesicle involvement.
- In vitro studies using small interfering RNA to disrupt p300 transcripts in PCa cells.
Main Results:
- p300 expression significantly correlated with in vivo proliferation (P=0.009).
- High p300 levels predicted larger tumor volumes (P<0.001), extraprostatic extension (P=0.003), and seminal vesicle involvement (P=0.002).
- Elevated p300 predicted post-surgical PCa progression (P=0.01).
- p300 inhibition reduced PCa cell proliferation under basal and IL-6 stimulated conditions.
Conclusions:
- p300 is a significant factor in PCa cell proliferation.
- p300 expression levels are indicative of PCa aggressiveness and progression.
- Targeting p300 may offer a therapeutic strategy for managing PCa progression.