The C-ETS2-TFEB Axis Promotes Neuron Survival under Oxidative Stress by Regulating Lysosome Activity

Oxid Med Cell Longev. 2016:2016:4693703. doi: 10.1155/2016/4693703. Epub 2016 Apr 19.

Abstract

Excessive reactive oxygen species/reactive nitrogen species (ROS/RNS) produced as a result of ageing causes damage to macromolecules and organelles or leads to interference of cell signalling pathways, which in turn results in oxidative stress. Oxidative stress occurs in many neurodegenerative diseases (e.g., Parkinson's disease) and contributes to progressive neuronal loss. In this study, we show that cell apoptosis is induced by oxidative stress and that lysosomes play an important role in cell survival under oxidative stress. As a compensatory response to this stress, lysosomal genes were upregulated via induction of transcription factor EB (TFEB). In addition, localization of TFEB to the nucleus was increased by oxidative stress. We also confirmed that TFEB protects cells from oxidative stress both in vitro and in vivo. Finally, we found that C-ETS2 senses oxidative stress, activates TFEB transcription, and mediates the upregulation of lysosomal genes. Our results demonstrate a mechanistic pathway for inducing lysosomal activity during ageing and neurodegeneration.

MeSH terms

  • Active Transport, Cell Nucleus
  • Animals
  • Apoptosis
  • Autophagy
  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / genetics
  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors / metabolism*
  • Cell Line, Tumor
  • Cell Survival
  • Cellular Senescence
  • HEK293 Cells
  • Humans
  • Hydrogen Peroxide / toxicity
  • Lysosomes / drug effects
  • Lysosomes / metabolism*
  • Lysosomes / pathology
  • Mice
  • Nerve Degeneration
  • Neurons / drug effects
  • Neurons / metabolism*
  • Neurons / pathology
  • Oxidative Stress* / drug effects
  • Proto-Oncogene Protein c-ets-2 / genetics
  • Proto-Oncogene Protein c-ets-2 / metabolism*
  • RNA Interference
  • Signal Transduction
  • Transcription, Genetic
  • Transcriptional Activation
  • Transfection

Substances

  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
  • ETS2 protein, human
  • Proto-Oncogene Protein c-ets-2
  • TFEB protein, human
  • Hydrogen Peroxide