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Updated: May 25, 2026
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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
TRIM8 modulates p53 activity to dictate cell cycle arrest.
Mariano Francesco Caratozzolo1, Lucia Micale, Maria Giuseppina Turturo
1Institute for Biomedical Technologies, National Research Council, Bari, Italy.
Cell Cycle (Georgetown, Tex.)
|January 21, 2012
Summary
The tumor suppressor p53 controls cell proliferation. We found that TRIM8 stabilizes p53 under stress, enhancing cell cycle arrest and DNA repair, suggesting TRIM8 as a therapeutic target.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- p53 is a critical tumor suppressor regulating cell proliferation and genome integrity.
- Cellular stress triggers p53 activity through post-translational modifications and protein interactions.
- The precise mechanisms governing cell fate decisions under stress are not fully understood.
Purpose of the Study:
- To identify novel regulators of the p53-mediated tumor suppression pathway.
- To investigate the role of human TRIM8 protein in p53 stability and activity.
- To explore TRIM8 as a potential therapeutic target for cancer treatment.
Main Methods:
- UV-induced stress models in human cells.
- Western blotting and quantitative PCR to assess protein and gene expression.
- Co-immunoprecipitation assays to study protein-protein interactions.
- Silencing and overexpression of TRIM8 to evaluate its functional impact.
Main Results:
- p53 induces TRIM8 expression under stress conditions.
- TRIM8 stabilizes p53, enhancing cell cycle arrest via CDKN1A (p21) and GADD45.
- TRIM8 physically interacts with p53, disrupting the p53-MDM2 interaction.
- TRIM8 overexpression leads to MDM2 degradation, a key regulator of p53 stability.
Conclusions:
- TRIM8 is a novel positive modulator of p53 tumor suppressor activity.
- TRIM8 enhances p53-mediated cell cycle arrest and DNA repair gene expression.
- TRIM8 represents a potential therapeutic target to restore or enhance p53 function in cancer.
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