Activity of translation regulator eukaryotic elongation factor-2 kinase is increased in Parkinson disease brain and its inhibition reduces alpha synuclein toxicity

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  • Asad Jan
  • Brandon Jansonius, British Columbia Cancer Research Centre, Vancouver, Canada
  • Alberto Delaidelli, University of British Columbia, Canada
  • Forum Bhanshali, University of British Columbia, Canada
  • Yi Andy An, University of British Columbia, Canada
  • Nelson Ferreira
  • Lisa M Smits, University of Luxembourg, Luxembourg
  • Gian Luca Negri, University of British Columbia, Canada
  • Jens C Schwamborn, University of Luxembourg, Luxembourg
  • Poul H Jensen
  • Ian R Mackenzie, University of British Columbia, Canada
  • Stefan Taubert, University of British Columbia, Canada
  • Poul H Sorensen, British Columbia Cancer Research Centre, Vancouver, University of British Columbia, Canada

Parkinson disease (PD) is the second most common neurodegenerative disorder and the leading neurodegenerative cause of motor disability. Pathologic accumulation of aggregated alpha synuclein (AS) protein in brain, and imbalance in the nigrostriatal system due to the loss of dopaminergic neurons in the substantia nigra- pars compacta, are hallmark features in PD. AS aggregation and propagation are considered to trigger neurotoxic mechanisms in PD, including mitochondrial deficits and oxidative stress. The eukaryotic elongation factor-2 kinase (eEF2K) mediates critical regulation of dendritic mRNA translation and is a crucial molecule in diverse forms of synaptic plasticity. Here we show that eEF2K activity, assessed by immuonohistochemical detection of eEF2 phosphorylation on serine residue 56, is increased in postmortem PD midbrain and hippocampus. Induction of aggressive, AS-related motor phenotypes in a transgenic PD M83 mouse model also increased brain eEF2K expression and activity. In cultures of dopaminergic N2A cells, overexpression of wild-type human AS or the A53T mutant increased eEF2K activity. eEF2K inhibition prevented the cytotoxicity associated with AS overexpression in N2A cells by improving mitochondrial function and reduced oxidative stress. Furthermore, genetic deletion of the eEF2K ortholog efk-1 in C. elegans attenuated human A53T AS induced defects in behavioural assays reliant on dopaminergic neuron function. These data suggest a role for eEF2K activity in AS toxicity, and support eEF2K inhibition as a potential target in reducing AS-induced oxidative stress in PD.

Original languageEnglish
Article number54
JournalActa Neuropathologica Communications
Volume6
Issue1
Number of pages17
ISSN2051-5960
DOIs
Publication statusPublished - 2018

    Research areas

  • eEF2K, Parkinson disease, mRNA translation, Alpha synuclein

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