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Nuclear EGFR shuttling induced by ionizing radiation is regulated by phosphorylation at residue Thr654

Klaus Dittmann1, Claus Mayer, Birgit Fehrenbacher

  • 1Division of Radiobiology and Molecular Environmental Research, Department of Radiation Oncology, University of Tübingen, Tübingen, Germany. Klaus.dittmann@uni-tuebingen.de

FEBS Letters
|August 10, 2010
PubMed

Insights

Blocking nuclear EGFR transport, essential for tumor cell resistance, can be a new strategy. Targeting the Thr654 residue in the nuclear localization signal (NLS) prevents EGFR nuclear shuttling and DNA repair, reducing tumor survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Nuclear localization of Epidermal Growth Factor Receptor (EGFR) is linked to treatment resistance in tumor cells.
  • Understanding the mechanisms of nuclear EGFR transport is crucial for developing novel therapeutic strategies.

Purpose of the Study:

  • To identify molecular targets that can block the nuclear shuttling of EGFR.
  • To investigate the role of the Thr654 residue in EGFR nuclear import.

Main Methods:

  • Site-directed mutagenesis of the Thr654 residue within the putative EGFR Nuclear Localization Signal (NLS).
  • Treatment with a peptide mimicking the phosphorylated NLS to inhibit nuclear transport.
  • Assessment of DNA-PK activation, residual DNA damage, and cellular survival following irradiation.

Main Results:

  • Phosphorylation of Thr654 is essential for EGFR nuclear shuttling post-irradiation.
  • Deletion of Thr654 blocked nuclear transport, while mutation to Glu enhanced it.
  • A peptide targeting the phosphorylated NLS abolished nuclear EGFR transport, reduced DNA-PK activation, increased residual DNA damage, and decreased tumor cell survival after irradiation.

Conclusions:

  • Blockage of nuclear EGFR shuttling, specifically targeting the Thr654 residue, represents a potential strategy to overcome treatment resistance.
  • Inhibiting nuclear EGFR transport sensitizes tumor cells to radiation therapy by impairing DNA repair mechanisms.

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