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Do early premalignant changes in normal breast epithelial cells predict cancer development?
Robert B Clarke1, Nigel J Bundred
1CR-UK Department of Medical Oncology, University of Manchester, Christie Hospital NHS Trust, Manchester, UK.
Breast Cancer Research : BCR
|January 12, 2005
Summary
Over-expression of cyclo-oxygenase-2 (COX-2) in premalignant breast cells suggests it may be an early event in breast cancer development. COX-2 inhibition could be a potential chemoprevention strategy.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Cyclo-oxygenase-2 (COX-2) over-expression is observed in premalignant breast cells (vHMECs) when the INK4A gene is silenced.
- This suggests COX-2 may play a role in the early stages of breast cancer development, promoting cell survival and proliferation.
Purpose of the Study:
- To investigate the potential role of COX-2 over-expression in early breast cancer aetiology.
- To explore the possibility of COX-2 inhibition as a chemoprevention strategy for breast cancer.
Main Methods:
- In vitro study using a model of premalignant breast cells (vHMECs).
- Analysis of gene silencing (INK4A) and subsequent protein over-expression (COX-2).
Main Results:
- Silencing of the INK4A gene in vHMECs was associated with increased COX-2 expression.
- This preliminary in vitro evidence suggests COX-2 over-expression may facilitate the evasion of apoptosis in early-stage breast cells.
Conclusions:
- COX-2 over-expression appears to be an early event in breast cancer aetiology, potentially enabling premalignant cells to survive and proliferate.
- Targeting COX-2 through inhibition may represent a viable chemoprevention strategy for breast cancer.