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Ferritin binds and activates p53 under oxidative stress
Jong-Hyuk Lee1, Hyonchol Jang, Eun-Jung Cho
1National Research Laboratory for Metabolic Checkpoint, Department of Biomedical Sciences & Biochemistry, Seoul National University College of Medicine, Seoul, Republic of Korea.
Biochemical and Biophysical Research Communications
|September 1, 2009
Summary
Ferritin interacts with the p53 protein during oxidative stress, enhancing p53 activity. This ferritin-p53 cooperation helps cells manage oxidative stress and maintain iron homeostasis.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Ferritin is a key iron storage protein crucial for iron homeostasis and mitigating oxidative stress by controlling cellular iron levels.
- The tumor suppressor p53 is activated by iron depletion and regulates reactive oxygen species, but its direct relationship with ferritin remains unclear.
Purpose of the Study:
- To investigate the direct functional and physical interactions between ferritin and the p53 protein.
- To elucidate the role of ferritin in modulating p53 activity and cellular responses to oxidative stress.
Main Methods:
- Co-immunoprecipitation assays to detect physical interaction between ferritin and p53.
- Western blotting and quantitative PCR to assess p53 protein levels and target gene expression.
- Cellular experiments involving ferritin knockdown under oxidative stress conditions.
Main Results:
- Ferritin physically interacts with p53 in response to oxidative stress.
- Ferritin enhances both p53 protein levels and its transcriptional activity, independently of its ferroxidase function.
- Reduced ferritin levels (knockdown) result in delayed induction of p53 target genes following oxidative stress.
Conclusions:
- Ferritin directly interacts with and functionally cooperates with p53.
- This interaction is critical for an effective cellular response to oxidative stress.
- Ferritin plays a significant role in the p53-mediated antioxidant defense pathway.
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