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BRCA1 loss induces GADD153-mediated doxorubicin resistance in prostate cancer

Paola De Luca1, Elba S Vazquez, Cristian P Moiola

  • 1Laboratory of Cancer and Apoptosis, Department of Biological Chemistry, School of Scences, University of Buenos Aires, CONICET, Buenos Aires, Argentina.

Molecular Cancer Research : MCR
|June 25, 2011
PubMed

Insights

BRCA1 (Breast Carcinoma gene 1) regulates prostate cancer cell fate and viability following DNA damage. Its role in transcriptional response to genotoxic stress impacts apoptosis, cell-cycle arrest, and tumor growth, suggesting new therapeutic strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • BRCA1's role in DNA repair and chemoresistance is established.
  • Its function as a transcriptional coregulator in response to DNA damage is less understood.

Purpose of the Study:

  • To investigate BRCA1's role in the transcriptional response to genotoxic stress in prostate cancer.
  • To identify BRCA1-regulated genes involved in genome stability and cell-cycle control.

Main Methods:

  • Utilized doxorubicin treatment in prostate cancer cell lines and xenograft models.
  • Performed gene expression analysis and promoter assays.
  • Investigated the impact of GADD153 depletion.

Main Results:

  • BRCA1 expression mediates apoptosis, cell-cycle arrest, and decreased viability.
  • BRCA1 depletion increased tumor growth in xenograft studies.
  • Identified BLM, FEN1, BRCA2, and GADD153 as direct BRCA1 transcriptional targets.

Conclusions:

  • BRCA1 orchestrates cell fate decisions via a novel transcriptional pathway in response to DNA damage.
  • BRCA1 status is crucial for considering new chemotherapeutic strategies in prostate cancer.

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