Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 295, Issue 30, Pages 10138-10152Publisher
ELSEVIER
DOI: 10.1074/jbc.RA119.011650
Keywords
?-synuclein; amyloid-? (A?; ); mitochondria; neurodegeneration; HtrA2; Omi; HtrA serine peptidase 2; Parkinson disease; protein aggregation; protein homeostasis; Lon protease; Lon peptidase 1 mitochondrial; ?-synuclein (a-synuclein); amyloid-? (AB); mitochondria; neurodegenerative disease; neurodegeneration; HtrA serine peptidase 2; HtrA2; Omi; protein homeostasis
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [LA 3609/2-1]
- Wellcome Trust [065807/Z/01/Z, 203249/Z/16/Z]
- UK Medical Research Council (MRC) [MR/K02292X/1]
- Alzheimer Research UK (ARUK) [ARUK-PG013-14]
- Michael J Fox Foundation [16238]
- Infinitus China Ltd.
- UK Engineering and Physical Sciences Research Council (EPSRC)
- MRC [MC_U105184326, MR/K02292X/1, MR/N012453/1] Funding Source: UKRI
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Mitochondrial dysfunction has long been implicated in the neurodegenerative disorder Parkinson's disease (PD); however, it is unclear how mitochondrial impairment and ?-synuclein pathology are coupled. Using specific mitochondrial inhibitors, EM analysis, and biochemical assays, we report here that intramitochondrial protein homeostasis plays a major role in ?-synuclein aggregation. We found that interference with intramitochondrial proteases, such as HtrA2 and Lon protease, and mitochondrial protein import significantly aggravates ?-synuclein seeding. In contrast, direct inhibition of mitochondrial complex I, an increase in intracellular calcium concentration, or formation of reactive oxygen species, all of which have been associated with mitochondrial stress, did not affect ?-synuclein pathology. We further demonstrate that similar mechanisms are involved in amyloid-? 1-42 (A?42) aggregation. Our results suggest that, in addition to other protein quality control pathways, such as the ubiquitin?proteasome system, mitochondriaper secan influence protein homeostasis of cytosolic aggregation-prone proteins. We propose that approaches that seek to maintain mitochondrial fitness, rather than target downstream mitochondrial dysfunction, may aid in the search for therapeutic strategies to manage PD and related neuropathologies.
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