Rapamycin activation of 4E-BP prevents parkinsonian dopaminergic neuron loss

Nat Neurosci. 2009 Sep;12(9):1129-35. doi: 10.1038/nn.2372. Epub 2009 Aug 16.

Abstract

Mutations in PINK1 and PARK2 cause autosomal recessive parkinsonism, a neurodegenerative disorder that is characterized by the loss of dopaminergic neurons. To discover potential therapeutic pathways, we identified factors that genetically interact with Drosophila park and Pink1. We found that overexpression of the translation inhibitor Thor (4E-BP) can suppress all of the pathologic phenotypes, including degeneration of dopaminergic neurons in Drosophila. 4E-BP is activated in vivo by the TOR inhibitor rapamycin, which could potently suppress pathology in Pink1 and park mutants. Rapamycin also ameliorated mitochondrial defects in cells from individuals with PARK2 mutations. Recently, 4E-BP was shown to be inhibited by the most common cause of parkinsonism, dominant mutations in LRRK2. We also found that loss of the Drosophila LRRK2 homolog activated 4E-BP and was also able to suppress Pink1 and park pathology. Thus, in conjunction with recent findings, our results suggest that pharmacologic stimulation of 4E-BP activity may represent a viable therapeutic approach for multiple forms of parkinsonism.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Genetically Modified
  • Cell Survival / drug effects
  • Cell Survival / physiology
  • Dopamine / metabolism*
  • Drosophila
  • Drosophila Proteins / genetics
  • Drosophila Proteins / metabolism*
  • Fibroblasts / drug effects
  • Fibroblasts / physiology
  • Glutathione Transferase / metabolism
  • Humans
  • Intracellular Signaling Peptides and Proteins / metabolism*
  • Locomotion / drug effects
  • Locomotion / physiology
  • Mitochondria / drug effects
  • Mitochondria / physiology
  • Muscles / drug effects
  • Muscles / ultrastructure
  • Nerve Degeneration / drug therapy
  • Nerve Degeneration / physiopathology
  • Neurons / drug effects
  • Neurons / physiology*
  • Neuroprotective Agents / pharmacology*
  • Peptide Initiation Factors / metabolism*
  • Protein-Serine-Threonine Kinases / genetics
  • Sirolimus / pharmacology*
  • Ubiquitin-Protein Ligases / metabolism

Substances

  • Drosophila Proteins
  • Intracellular Signaling Peptides and Proteins
  • Neuroprotective Agents
  • Peptide Initiation Factors
  • Thor protein, Drosophila
  • Ubiquitin-Protein Ligases
  • parkin protein
  • Glutathione Transferase
  • LRRK protein, Drosophila
  • PINK1 protein, Drosophila
  • Protein-Serine-Threonine Kinases
  • park protein, Drosophila
  • Dopamine
  • Sirolimus