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Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
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Published on: September 28, 2012

Foxp3 expression in p53-dependent DNA damage responses.

Da-Jung Jung1, Dong-Hoon Jin, Seung-Woo Hong

  • 1Department of Anatomy and Tumor Immunity Medical Research Center, Seoul National University College of Medicine, Seoul 110-744, USA.

The Journal of Biological Chemistry
|January 16, 2010
PubMed
Summary
This summary is machine-generated.

The tumor suppressor protein p53 directly regulates the transcription factor Foxp3, particularly after DNA damage. This p53-Foxp3 interaction is crucial for controlling cell growth and tumor suppression in cancer cells.

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • The transcription factor Foxp3 is implicated in suppressing breast cancer oncogenes SKP2 and HER-2/ErbB2.
  • Mechanisms governing Foxp3 expression and its role in tumor development are not well understood.

Purpose of the Study:

  • To investigate the regulation of Foxp3 expression, particularly in response to DNA damage.
  • To elucidate the role of the p53 pathway in controlling Foxp3 levels and function.

Main Methods:

  • Utilized human breast and colon carcinoma cell lines with varying p53 statuses.
  • Administered genotoxic agents (doxorubicin, etoposide) to induce DNA damage.
  • Employed RNA interference to knock down p53 and Foxp3 expression.
  • Assessed Foxp3 induction and p53-mediated growth inhibition.

Main Results:

  • Foxp3 up-regulation upon DNA damage is dependent on functional p53.
  • p53 directly regulates Foxp3 expression in response to genotoxic stress.
  • Knockdown of p53 abolished Foxp3 induction, while p53 re-expression restored it.
  • Foxp3 knockdown diminished the p53-mediated growth inhibitory effects.

Conclusions:

  • Foxp3 induction during tumor suppression is controlled by p53 in a DNA damage-dependent manner.
  • Foxp3 is a critical factor in determining cell fate within p53-mediated DNA damage responses.
  • This highlights a novel regulatory axis in cancer cell response to DNA damage.