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NRP/B mutations impair Nrf2-dependent NQO1 induction in human primary brain tumors

S Seng1, H K Avraham, G Birrane

  • 1Division of Experimental Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA.

Oncogene
|November 5, 2008
PubMed

Insights

Nuclear restricted protein in brain (NRP/B) interacts with Nrf2 to regulate antioxidant gene expression. Mutations in NRP/B disrupt this interaction, leading to its cytoplasmic localization and impaired cellular protection in brain tumors.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Neuro-oncology

Background:

  • Brain tumors involve genetic alterations and oxidative stress from reactive oxygen species (ROS).
  • Nuclear restricted protein in brain (NRP/B) is a nuclear matrix protein implicated in cellular processes.
  • NF-E2-related factor 2 (Nrf2) is a key transcription factor regulating antioxidant responses.

Purpose of the Study:

  • To investigate the role of NRP/B in the cellular response to oxidative stress in brain tumors.
  • To elucidate the interaction between NRP/B and Nrf2 in regulating antioxidant gene expression.
  • To determine the impact of NRP/B mutations and localization on brain tumor development.

Main Methods:

  • Co-localization and interaction studies of NRP/B and Nrf2 in SH-SY5Y cells under oxidative stress.
  • Analysis of NAD(P)H:quinone oxidoreductase 1 (NQO1) expression.
  • Examination of NRP/B localization in normal brain cells versus primary brain tumors.
  • Functional analysis of NRP/B mutants from brain tumors.

Main Results:

  • NRP/B expression and its interaction with Nrf2 are upregulated during oxidative stress.
  • NRP/B-Nrf2 association is critical for the induction of NQO1.
  • NRP/B is predominantly nuclear in normal brain cells but cytoplasmic in brain tumors.
  • Mutant NRP/B from brain tumors exhibits cytoplasmic localization and fails to induce Nrf2-dependent NQO1 transcription.

Conclusions:

  • NRP/B mutations and altered cytoplasmic localization disrupt Nrf2-dependent NQO1 activation in brain tumors.
  • Dysregulation of NRP/B function contributes to impaired cellular protection against ROS in brain tumorigenesis.
  • This study reveals a novel mechanism involving NRP/B in modulating Nrf2-mediated antioxidant defense in the brain.

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