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BID regulation by p53 contributes to chemosensitivity

Joanna K Sax1, Peiwen Fei, Maureen E Murphy

  • 1Laboratory of Molecular Oncology and Cell Cycle Regulation, Howard Hughes Medical Institute, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.

Nature Cell Biology
|October 29, 2002
PubMed

Insights

The p53 protein regulates the transcription of the BID gene, a key player in apoptosis. This discovery reveals BID as a chemosensitivity gene that may improve cancer treatment outcomes.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • The tumor suppressor protein p53 (encoded by TP53) regulates genes involved in cell-cycle arrest and apoptosis.
  • The precise apoptotic pathway mediated by p53 remains incompletely understood.

Purpose of the Study:

  • To investigate the regulation of the BID gene by p53.
  • To elucidate the role of BID in p53-mediated apoptosis and chemosensitivity.

Main Methods:

  • Analysis of BID mRNA expression in p53-dependent contexts.
  • Identification and characterization of p53-binding DNA response elements in the BID genomic loci.
  • Assessment of chemosensitivity in BID-null versus wild-type mouse embryonic fibroblasts.

Main Results:

  • BID mRNA levels increase in a p53-dependent manner both in vitro and in vivo.
  • p53 directly binds to response elements in the BID gene, mediating its transactivation.
  • BID-null cells exhibit resistance to DNA-damaging agents like adriamycin and 5-fluorouracil, which stabilize p53.

Conclusions:

  • BID is a direct transcriptional target of p53.
  • BID acts as a p53-responsive 'chemosensitivity gene'.
  • The p53-BID interaction enhances cellular responses to chemotherapy, potentially improving cancer treatment efficacy.

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