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High Content Screening in Neurodegenerative Diseases
Published on: January 6, 2012
Loss of DJ-1 impairs antioxidant response by altered glutamine and serine metabolism
J Meiser1, S Delcambre1, A Wegner1
1Luxembourg Centre for Systems Biomedicine, University of Luxembourg, L-4367 Belvaux, Luxembourg.
Abstract:
The oncogene DJ-1 has been originally identified as a suppressor of PTEN. Further on, loss-of-function mutations have been described as a causative factor in Parkinson's disease (PD). DJ-1 has an important function in cellular antioxidant responses, but its role in central metabolism of neurons is still elusive. We applied stable isotope assisted metabolic profiling to investigate the effect of a functional loss of DJ-1 and show that DJ-1 deficient neuronal cells exhibit decreased glutamine influx and reduced serine biosynthesis. By providing precursors for GSH synthesis, these two metabolic pathways are important contributors to cellular antioxidant response. Down-regulation of these pathways, as a result of loss of DJ-1 leads to an impaired antioxidant response. Furthermore, DJ-1 deficient mouse microglia showed a weak but constitutive pro-inflammatory activation. The combined effects of altered central metabolism and constitutive activation of glia cells raise the susceptibility of dopaminergic neurons towards degeneration in patients harboring mutated DJ-1. Our work reveals metabolic alterations leading to increased cellular instability and identifies potential new intervention points that can further be studied in the light of novel translational medicine approaches.
Insights
Loss of the DJ-1 gene impairs neuronal metabolism and antioxidant defenses, contributing to Parkinson's disease pathogenesis. This metabolic dysfunction and glial activation increase neuronal vulnerability.
Area of Science:
- Neuroscience
- Metabolic Research
- Genetics
Background:
- The oncogene DJ-1, implicated in Parkinson's disease (PD) through loss-of-function mutations, plays a role in cellular antioxidant responses.
- Its specific function in neuronal central metabolism remains largely uncharacterized.
- DJ-1's dual role as an oncogene suppressor and its link to neurodegeneration highlights its complex cellular functions.
Purpose of the Study:
- To investigate the impact of DJ-1 functional loss on neuronal central metabolism.
- To elucidate the mechanisms by which DJ-1 deficiency affects cellular antioxidant capacity.
- To explore the consequences of DJ-1 loss on glial cell activation and neuronal susceptibility.
Main Methods:
- Stable isotope-assisted metabolic profiling was employed to analyze DJ-1 deficient neuronal cells.
- Metabolic pathways, including glutamine influx and serine biosynthesis, were quantified.
- Pro-inflammatory activation markers in DJ-1 deficient mouse microglia were assessed.
Main Results:
- DJ-1 deficient neuronal cells displayed reduced glutamine uptake and serine biosynthesis.
- These metabolic alterations impair the cellular antioxidant response by limiting precursors for glutathione (GSH) synthesis.
- DJ-1 deficient microglia exhibited a mild but persistent pro-inflammatory activation.
Conclusions:
- Functional loss of DJ-1 disrupts neuronal metabolism and antioxidant defenses, leading to cellular instability.
- Altered glial cell activity and metabolic dysfunction in DJ-1 deficient cells increase dopaminergic neuron susceptibility to degeneration.
- These findings identify potential therapeutic targets for Parkinson's disease and related neurodegenerative disorders.
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