Cited by 303Parkinson's Disease Mechanisms and TreatmentsAutophagy in Disease and TherapyNuclear Receptors and Signaling

Disrupted Autophagy Leads to Dopaminergic Axon and Dendrite Degeneration and Promotes Presynaptic Accumulation of α-Synuclein and LRRK2 in the Brain

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Friedman, Lauren G., Lachenmayer, M. Lenard, Wang, Jing, He, Liqiang, Poulose, Shibu M., Komatsu, Masaaki, Holstein, Gay R., Yue, Zhenyu·2012·The Journal of Neuroscience

Abstract

Parkinson's disease (PD) is characterized pathologically by the formation of ubiquitin and α-synuclein (α-syn)-containing inclusions (Lewy bodies), dystrophic dopamine (DA) terminals, and degeneration of midbrain DA neurons. The precise molecular mechanisms underlying these pathological features remain elusive. Accumulating evidence has implicated dysfunctional autophagy, the cell self-digestion and neuroprotective pathway, as one of the pathogenic systems contributing to the development of idiopathic PD. Here we characterize autophagy-deficient mouse models and provide in vivo evidence for the potential role that impaired autophagy plays in pathogenesis associated with PD. Cell-specific deletion of essential autophagy gene Atg7 in midbrain DA neurons causes delayed neurodegeneration, accompanied by late-onset locomotor deficits. In contrast,Atg7-deficient DA neurons in the midbrain exhibit early dendritic and axonal dystrophy, reduced striatal dopamine content, and the formation of somatic and dendritic ubiquitinated inclusions in DA neurons. Furthermore, whole-brain-specific loss of Atg7 leads to presynaptic accumulation of α-syn and LRRK2 proteins, which are encoded by two autosomal dominantly inherited PD-related genes. Our results suggest that disrupted autophagy may be associated with enhanced levels of endogenous α-syn and LRRK2 proteins in vivo. Our findings implicate dysfunctional autophagy as one of the failing cellular mechanisms involved in the pathogenesis of idiopathic PD.

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Authors
Friedman, L. G., Lachenmayer, M. L., Wang, J., He, L., Poulose, S. M., Komatsu, M., Holstein, G. R., & Yue, Z.
Affiliations
  • Icahn School of Medicine at Mount Sinai (US)
  • Tokyo Metropolitan Institute of Medical Science (JP)
Venue
The Journal of Neuroscience
Published
2012-05-30
Volume
32
Issue
22
Pages
7585-7593
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2126478464
Cited by
303
References
30
Citations by year
2026: 14 · 2025: 20 · 2024: 18 · 2023: 21 · 2022: 18 · 2021: 23 · 2020: 29 · 2019: 19 · 2018: 22 · 2017: 19 · 2016: 24 · 2015: 20 · 2014: 13 · 2013: 30 · 2012: 12
FWCI
15.68
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (9724504, 1 S10 RR0 9145-01)
  • Michael J. Fox Foundation for Parkinson's Research
  • Bachmann-Strauss Dystonia and Parkinson Foundation
  • Parkinson Alliance
  • Deutsche Forschungsgemeinschaft
  • National Institutes of Health (1S10 RR0 9145-01)
  • U.S. Public Health Service (RNS055683A)
  • Parkinsonfonden
  • National Institute of Mental Health (T32MH096678)
  • National Cancer Institute (R24CA095823)
  • National Institute of Neurological Disorders and Stroke (R21NS055683, R01NS072359, R01NS060809, NS060809, R01NS060123)
  • National Center for Research Resources (1 S10RR0 9145-01)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
Keywords
Parkinson's disease, autophagy, ATG7, dopaminergic neurons, axonal degeneration, dendritic degeneration, alpha-synuclein, LRRK2, Lewy bodies, midbrain, striatal dopamine, locomotor deficits, neurodegeneration
MeSH terms
Autophagy-Related Protein 5, Autophagy-Related Protein 7, Animals, Autophagy, Brain, Cells, Cultured, Inclusion Bodies, Chromatography, High Pressure Liquid, Dendrites, Disease Models, Animal, Dopamine, Embryo, Mammalian, Fibroblasts, Gene Expression Regulation, Intermediate Filament Proteins, Mice, Transgenic, Microtubule-Associated Proteins, Motor Activity, Movement Disorders, Nerve Degeneration, Nerve Tissue Proteins, Tyrosine 3-Monooxygenase, Presynaptic Terminals, Ubiquitin, Ephrin-B1, Mice, alpha-Synuclein, Dopaminergic Neurons, Nestin

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