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Breast cancer amplified sequence 2, a novel negative regulator of the p53 tumor suppressor

Ping-Chang Kuo1, Yeou-Ping Tsao, Hung-Wei Chang

  • 1Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan.

Cancer Research
|November 12, 2009
PubMed

Insights

Breast cancer amplified sequence 2 (BCAS2) negatively regulates the tumor suppressor p53. BCAS2 depletion induces apoptosis in p53 wild-type cells, offering potential for cancer therapy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Breast cancer amplified sequence 2 (BCAS2) was previously identified as a transcriptional coactivator for the estrogen receptor.
  • The role of BCAS2 in regulating other key cellular proteins, particularly tumor suppressors, remains largely unexplored.

Purpose of the Study:

  • To investigate the interaction between BCAS2 and the tumor suppressor protein p53.
  • To elucidate the functional consequences of BCAS2 modulation on p53 activity and cellular fate.
  • To explore the potential of BCAS2 as a therapeutic target in cancer.

Main Methods:

  • Co-immunoprecipitation assays to confirm direct interaction between BCAS2 and p53.
  • Western blotting and quantitative PCR to assess protein and gene expression levels.
  • Cell viability assays, apoptosis assays (e.g., Annexin V staining), and cell cycle analysis.
  • Analysis of p53 phosphorylation at specific sites (Ser46 and Ser315).

Main Results:

  • BCAS2 directly interacts with p53, reducing its transcriptional activity and protein levels under normal conditions.
  • In the presence of DNA damage, BCAS2 significantly decreases p53 protein levels, conferring resistance to doxorubicin chemotherapy.
  • Silencing BCAS2 induces apoptosis in p53 wild-type cells via increased nuclear p53 retention and enhanced p53 phosphorylation at Ser46, while decreasing degradation via reduced phosphorylation at Ser315.
  • BCAS2 depletion leads to G2-M arrest in p53-null or mutant cells.

Conclusions:

  • BCAS2 functions as a novel negative regulator of p53.
  • BCAS2 influences p53 stability and activity through differential phosphorylation.
  • Targeting BCAS2 may represent a promising therapeutic strategy for p53 wild-type cancers.

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