Journal
CELL METABOLISM
Volume 17, Issue 6, Pages 941-953Publisher
CELL PRESS
DOI: 10.1016/j.cmet.2013.04.014
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Funding
- Wellcome Trust/MRC [WT089698]
- MRC Protein Phosphorylation unit at the University of Dundee
- Parkinson's UK
- Kattan Trust
- UK MRC [G1000709]
- [MRC/COEN007/MR/J009660/1]
- MRC [G1000709, MC_G1000735, MR/J009660/1] Funding Source: UKRI
- Medical Research Council [G1000709, MC_G1000735, MR/J009660/1] Funding Source: researchfish
- Parkinson's UK [G-1104] Funding Source: researchfish
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Mutations in the glucocerebrosidase (gba) gene cause Gaucher disease (GD), the most common lysosomal storage disorder, and increase susceptibility to Parkinson's disease (PD). While the clinical and pathological features of idiopathic PD and PD related to gba (PD-GBA) mutations are very similar, cellular mechanisms underlying neurodegeneration in each are unclear. Using a mouse model of neuronopathic GD, we show that autophagic machinery and proteasomal machinery are defective in neurons and astrocytes lacking gba. Markers of neurodegeneration-p62/SQSTM1, ubiquitinated proteins, and insoluble alpha-synuclein-accumulate. Mitochondria were dysfunctional and fragmented, with impaired respiration, reduced respiratory chain complex activities, and a decreased potential maintained by reversal of the ATP synthase. Thus a primary lysosomal defect causes accumulation of dysfunctional mitochondria as a result of impaired autophagy and dysfunctional proteasomal pathways. These data provide conclusive evidence for mitochondrial dysfunction in GD and provide insight into the pathogenesis of PD and PD-GBA.
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