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Ultraviolet irradiation induces BRCA2 protein depletion through a p53-independent and protein synthesis-dependent

S C Wang1, K Makino, L K Su

  • 1Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.

Cancer Research
|April 18, 2001
PubMed

Insights

UV radiation down-regulates BRCA2 protein levels, impacting DNA damage repair. Increased BRCA2 expression enhances cellular resistance to UV-induced damage, highlighting its role in DNA damage signaling pathways.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The BRCA2 protein is implicated in DNA damage repair.
  • BRCA2's role in DNA-damaging signaling pathways is under investigation.

Purpose of the Study:

  • To investigate the alteration of BRCA2 protein levels following UV irradiation.
  • To determine if BRCA2 expression influences cellular resistance to UV damage.

Main Methods:

  • Human cell lines were exposed to varying doses of UV irradiation.
  • BRCA2 protein levels were monitored post-irradiation.
  • Cellular resistance to UV was assessed with ectopic BRCA2 expression.

Main Results:

  • UV irradiation caused a dose-dependent down-regulation of BRCA2 protein levels within 4 hours.
  • BRCA2 down-regulation by UV does not require functional p53.
  • Blocking protein synthesis temporarily inhibited BRCA2 depletion.
  • Ectopic BRCA2 expression increased cellular resistance to high-dose UV irradiation.

Conclusions:

  • BRCA2 is involved in the DNA damage signaling pathway induced by UV radiation.
  • BRCA2 expression confers protection against UV-mediated cell death.

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