ROS-dependent regulation of Parkin and DJ-1 localization during oxidative stress in neurons

Hum Mol Genet. 2012 Nov 15;21(22):4888-903. doi: 10.1093/hmg/dds325. Epub 2012 Aug 7.

Abstract

Mutations in several genes, including Parkin, PTEN-induced kinase 1 (Pink1) and DJ-1, are associated with rare inherited forms of Parkinson's disease (PD). Despite recent attention on the function of these genes, the interplay between DJ-1, Pink1 and Parkin in PD pathogenesis remains unclear. In particular, whether these genes regulate mitochondrial control pathways in neurons is highly controversial. Here we report that Pink1-dependent Parkin translocation does occur in mouse cortical neurons in response to a variety of mitochondrial damaging agents. This translocation only occurs in the absence of antioxidants in the neuronal culturing medium, implicating a key role of reactive oxygen species (ROS) in this response. Consistent with these observations, ROS blockers also prevent Parkin recruitment in mouse embryonic fibroblasts. Loss of DJ-1, a gene linked to ROS management, results in increased stress-induced Parkin recruitment and increased mitophagy. Expression of wild-type DJ-1, but not a cysteine-106 mutant associated with defective ROS response, rescues this accelerated Parkin recruitment. Interestingly, DJ-1 levels increase at mitochondria following oxidative damage in both fibroblasts and neurons, and this process also depends on Parkin and possibly Pink1. These results not only highlight the presence of a Parkin/Pink1-mediated pathway of mitochondrial quality control (MQC) in neurons, they also delineate a complex reciprocal relationship between DJ-1 and the Pink1/Parkin pathway of MQC.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Carbonyl Cyanide m-Chlorophenyl Hydrazone / pharmacology
  • Cell Line
  • Fibroblasts / metabolism
  • Mice
  • Mice, Knockout
  • Mitochondria / drug effects
  • Mitochondria / metabolism
  • Neurons / drug effects
  • Neurons / metabolism*
  • Oncogene Proteins / metabolism*
  • Oxidative Stress*
  • Peroxiredoxins
  • Protein Deglycase DJ-1
  • Protein Kinases / deficiency
  • Protein Kinases / genetics
  • Protein Transport
  • Reactive Oxygen Species / metabolism*
  • Rotenone / pharmacology
  • Signal Transduction
  • Ubiquitin-Protein Ligases / metabolism*

Substances

  • Oncogene Proteins
  • Reactive Oxygen Species
  • Rotenone
  • Carbonyl Cyanide m-Chlorophenyl Hydrazone
  • Peroxiredoxins
  • Ubiquitin-Protein Ligases
  • parkin protein
  • Protein Kinases
  • PTEN-induced putative kinase
  • PARK7 protein, mouse
  • Protein Deglycase DJ-1