Dataset Information

Proteomic characterisation of lysosomal and mitochondrial perturbations in human iPSC-derived neurons with PARK2 mutation

ABSTRACT: Mitochondrial dysfunction plays a major role in the pathogenesis of sporadic Parkinson’s disease (PD) and familial PD caused by mutations in the PARK2 gene. The protein, parkin, is vital for mitochondrial function, but the lack of key PD phenotypes in PARK2 knockout (KO) rodent models has hindered investigations into parkin’s role in PD pathogenesis. Human isogenic induced pluripotent stem cell (iPSC) lines with and without PARK2 KO enable studies of the effect of parkin dysfunction in dopaminergic neuronal cultures.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Permanent Cell Line Cell, Cell Culture

DISEASE(S): Parkinson's Disease

SUBMITTER: Pia Jensen

LAB HEAD: Martin Røssel Larsen

PROVIDER: PXD008894 | Pride | 2019-07-26

REPOSITORIES: Pride

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Publications

PARK2 Mutation Causes Metabolic Disturbances and Impaired Survival of Human iPSC-Derived Neurons.

Bogetofte Helle H Jensen Pia P Ryding Matias M Schmidt Sissel I SI Okarmus Justyna J Ritter Louise L Worm Christina S CS Hohnholt Michaela C MC Azevedo Carla C Roybon Laurent L Bak Lasse K LK Waagepetersen Helle H Ryan Brent J BJ Wade-Martins Richard R Larsen Martin R MR Meyer Morten M

Frontiers in cellular neuroscience 20190705

The protein parkin, encoded by the PARK2 gene, is vital for mitochondrial homeostasis, and although it has been implicated in Parkinson's disease (PD), the disease mechanisms remain unclear. We have applied mass spectrometry-based proteomics to investigate the effects of parkin dysfunction on the mitochondrial proteome in human isogenic induced pluripotent stem cell-derived neurons with and without PARK2 knockout (KO). The proteomic analysis quantified nearly 60% of all mitochondri ...[more]

PMID: 31333417

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Project description:Mutations in PARK2 gene are the most frequent cause of familial forms of Parkinson’s disease (PD). This gene encodes Parkin, an E3 ubiquitin ligase involved in several cellular mechanisms, such as the mitophagic process. Mutations in this gene, which cause the loss of function of Parkin, are responsible for the accumulation of damaged mitochondria. This improper disposal may generate increased levels of ROS, lower ATP production and apoptosis activation. Given the importance of mitochondrial dysfunctions and mitophagy impairment in PD pathogenesis, the aim of the present project was to investigate both whole-cell and mitochondrial proteome alterations in human skin fibroblasts of PARK2-mutated patients. To this purpose, total and mitochondrial-enriched protein fractions from fibroblasts of five PARK2-mutated patients and five control subjects were analyzed by quantitative shotgun proteomics, in order to identify proteins specifically altered by Parkin loss. Both the network-based and the GSEA analysis of proteomics results pointed out the importance of pathways in which Rab GTPase proteins are involved. An alteration of their levels also in the mitochondrial fraction may indicate a re-localization of these GTP/GDP molecular switches, master regulators of membrane trafficking. To have a more comprehensive view of the mitochondrial alterations due to PARK2 mutations, we investigated the impact of Parkin loss on mitochondrial function and network morphology. We unveiled that the mitochondrial membrane potential was reduced in PARK2-mutated patients. Nevertheless, PINK1 did not accumulate on depolarized mitochondria. Even after the treatment with CCCP, an ionophore that triggers mitophagy, the accumulation of PINK1 was less efficient in PARK2-mutated patients than in controls derived fibroblasts. The analysis of the mitochondrial network morphology showed a filamentous network with mitochondria distributed all over the cell that was comparable between PARK2-mutated patients and control subjects. Thus, our results suggested that the network morphology was not influenced by the mitochondrial depolarization and by the lack of Parkin, revealing a possible impairment of fission and, more in general, of mitochondrial dynamics. In conclusion, the present work highlighted new molecular factors and pathways altered by PARK2 mutations. Furthermore, we obtained a definition of the mitochondrial landscape and molecular mechanisms underlying the PARK2 form of Parkinson’s disease, which will help to unravel possible biochemical pathways altered also in the sporadic form of the disease. Indeed, it is known that in sporadic cases the genetic/epigenetic background and the environment lead over time to mitochondria impairment and to the accumulation of damaged organelles.

Dataset Information

Proteomic characterisation of lysosomal and mitochondrial perturbations in human iPSC-derived neurons with PARK2 mutation

Publications

<i>PARK2</i> Mutation Causes Metabolic Disturbances and Impaired Survival of Human iPSC-Derived Neurons.

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