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14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Estrogen receptor-alpha binds p53 tumor suppressor protein directly and represses its function
Wensheng Liu1, Santhi D Konduri, Sanjay Bansal
1Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Elm & Carlton Sts., Buffalo, NY 14263, USA.
The Journal of Biological Chemistry
|February 14, 2006
Summary
Estrogen receptor-alpha (ERalpha) directly binds and represses tumor suppressor p53. This interaction is disrupted by radiation, revealing a novel mechanism in breast cancer cell proliferation.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Estrogen receptor-alpha (ERalpha) drives breast cancer cell proliferation.
- Tumor suppressor p53 inhibits proliferation in cells with genomic damage.
- The direct interaction between ERalpha and p53 pathways was previously unclear.
Purpose of the Study:
- To investigate the direct link between ERalpha and p53 pathways.
- To elucidate the mechanism by which ERalpha influences p53 function.
- To understand the role of this interaction in breast cancer progression.
Main Methods:
- Investigated ERalpha-p53 interaction using biochemical assays.
- Utilized small interfering RNA (siRNA) to knock down p53 and ERalpha.
- Assessed p53-target gene expression and cell cycle progression.
- Examined the effect of ionizing radiation on the ERalpha-p53 interaction.
Main Results:
- ERalpha directly binds to p53, repressing its tumor-suppressive function.
- The interaction involves ERalpha's AF-2 domain and p53's C-terminal domain.
- Knocking down ERalpha or p53 had opposing effects on gene expression and cell cycle.
- Ionizing radiation disrupted the ERalpha-p53 interaction.
- Combined ERalpha knockdown and radiation enhanced p53-target gene p21 transcription.
Conclusions:
- ERalpha directly suppresses p53 activity, contributing to its pro-proliferative role in breast cancer.
- Disruption of the ERalpha-p53 interaction by DNA damage is a key regulatory mechanism.
- Targeting the ERalpha-p53 interaction may offer novel therapeutic strategies for breast cancer.
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