NRAGE associates with the anti-apoptotic factor Che-1 and regulates its degradation to induce cell death

J Cell Sci. 2007 Jun 1;120(Pt 11):1852-8. doi: 10.1242/jcs.03454. Epub 2007 May 8.

Abstract

Neurotrophin receptor-interacting MAGE homolog (NRAGE) has been recently identified as a cell-death inducer, involved in molecular events driving cells through apoptotic networks during neuronal development. Recently, we have focused on the functional role of Che-1, also known as apoptosis-antagonizing transcription factor (AATF), a protein involved in cell cycle control and gene transcription. Increasing evidence suggests that Che-1 is involved in apoptotic signalling in neural tissues. In cortical neurons Che-1 exhibits an anti-apoptotic activity, protecting cells from neuronal damage induced by amyloid beta-peptide. Here, we report that Che-1 interacts with NRAGE and that an EGFP-NRAGE fusion protein inhibits nuclear localization of Che-1, by sequestering it within the cytoplasmic compartment. Furthermore, NRAGE overexpression downregulates endogenous Che-1 by targeting it for proteasome-dependent degradation. Finally, we propose that Che-1 is a functional antagonist of NRAGE, because its overexpression completely reverts NRAGE-induced cell-death.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antigens, Neoplasm / chemistry
  • Antigens, Neoplasm / metabolism*
  • Apoptosis Regulatory Proteins / chemistry
  • Apoptosis Regulatory Proteins / metabolism*
  • Cell Death
  • Cell Nucleus / metabolism
  • HeLa Cells
  • Humans
  • Mice
  • NIH 3T3 Cells
  • Neoplasm Proteins / chemistry
  • Neoplasm Proteins / metabolism*
  • Protein Binding
  • Protein Processing, Post-Translational*
  • Protein Transport
  • Repressor Proteins / chemistry
  • Repressor Proteins / metabolism*
  • Transcription Factors / chemistry
  • Transcription Factors / metabolism*

Substances

  • AATF protein, human
  • Antigens, Neoplasm
  • Apoptosis Regulatory Proteins
  • MAGED1 protein, human
  • Neoplasm Proteins
  • Repressor Proteins
  • Transcription Factors