| Mitochondrial metabolism in Parkinson's disease impairs quality control autophagy by hampering microtubule-dependent traffic. | |
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MedLine Citation:
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PMID: 22843496 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Abnormal presence of autophagic vacuoles is evident in brains of patients with Parkinson's disease (PD), in contrast to the rare detection of autophagosomes in a normal brain. However, the actual cause and pathological significance of these observations remain unknown. Here, we demonstrate a role for mitochondrial metabolism in the regulation of the autophagy-lysosomal pathway in ex vivo and in vitro models of PD. We show that transferring mitochondria from PD patients into cells previously depleted of mitochondrial DNA is sufficient to reproduce the alterations in the autophagic system observed in PD patient brains. Although the initial steps of this pathway are not compromised, there is an increased accumulation of autophagosomes associated with a defective autophagic activity. We prove that this functional decline was originated from a deficient mobilization of autophagosomes from their site of formation toward lysosomes due to disruption in microtubule-dependent trafficking. This contributed directly to a decreased proteolytic flux of α-synuclein and other autophagic substrates. Our results lend strong support for a direct impact of mitochondria in autophagy as defective autophagic clearance ability secondary to impaired microtubule trafficking is driven by dysfunctional mitochondria. We uncover mitochondria and mitochondria-dependent intracellular traffic as main players in the regulation of autophagy in PD. |
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Authors:
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Daniela M Arduíno; A Raquel Esteves; Luísa Cortes; Diana F Silva; Bindi Patel; Manuela Grazina; Russell H Swerdlow; Catarina R Oliveira; Sandra M Cardoso |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2012-07-27 |
Journal Detail:
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Title: Human molecular genetics Volume: 21 ISSN: 1460-2083 ISO Abbreviation: Hum. Mol. Genet. Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-10-16 Completed Date: 2013-04-03 Revised Date: 2013-04-26 |
Medline Journal Info:
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Nlm Unique ID: 9208958 Medline TA: Hum Mol Genet Country: England |
Other Details:
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Languages: eng Pagination: 4680-702 Citation Subset: IM |
Affiliation:
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CNC – Center for Neuroscience and Cell Biology, Institute of Biology, University of Coimbra, Coimbra, Portugal. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Autophagy / physiology Brain / metabolism, physiopathology Cell Differentiation Cells, Cultured DNA, Mitochondrial / genetics Humans Lysosomes / metabolism*, pathology Microtubules / metabolism*, pathology Middle Aged Mitochondria / metabolism*, pathology Neurons / cytology, metabolism, pathology Parkinson Disease* / metabolism, physiopathology Protein Transport Signal Transduction Vacuoles / metabolism, pathology alpha-Synuclein / chemistry, metabolism |
| Grant Support | |
ID/Acronym/Agency:
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AG038072/AG/NIA NIH HHS; P30 AG035982/AG/NIA NIH HHS; P30AG035982/AG/NIA NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/DNA, Mitochondrial; 0/SNCA protein, human; 0/alpha-Synuclein |
| Comments/Corrections | |
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