Cited by 165Parkinson's Disease Mechanisms and TreatmentsNuclear Receptors and SignalingAlzheimer's disease research and treatments

α-Synuclein Overexpression Increases Cytosolic Catecholamine Concentration

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Mosharov, Eugene V., Staal, Roland G. W., Bové, Jordi, Prou, Delphine, Hananiya, Anthonia, Markov, Dmitriy, Poulsen, Nathan, Larsen, Kristin E. +5 more·2006·The Journal of Neuroscience

Abstract

Dysregulation of dopamine homeostasis and elevation of the cytosolic level of the transmitter have been suggested to underlie the vulnerability of catecholaminergic neurons in Parkinson's disease. Because several known mutations in alpha-synuclein or overexpression of the wild-type (WT) protein causes familial forms of Parkinson's disease, we investigated possible links between alpha-synuclein pathogenesis and dopamine homeostasis. Chromaffin cells isolated from transgenic mice that overexpress A30P alpha-synuclein displayed significantly increased cytosolic catecholamine levels as measured by intracellular patch electrochemistry, whereas cells overexpressing the WT protein and those from knock-out animals were not different from controls. Likewise, catechol concentrations were higher in L-DOPA-treated PC12 cells overexpressing A30P or A53T compared with those expressing WT alpha-synuclein, although the ability of cells to maintain a low cytosolic dopamine level after L-DOPA challenge was markedly inhibited by either protein. We also found that incubation with low-micromolar concentrations of WT, A30P, or A53T alpha-synuclein inhibited ATP-dependent maintenance of pH gradients in isolated chromaffin vesicles and that the WT protein was significantly less potent in inducing the proton leakage. In summary, we demonstrate that overexpression of different types of alpha-synuclein disrupts vesicular pH and leads to a marked increase in the levels of cytosolic catechol species, an effect that may in turn trigger cellular oxyradical damage. Although multiple molecular mechanisms may be responsible for the perturbation of cytosolic catecholamine homeostasis, this study provides critical evidence about how alpha-synuclein might exert its cytotoxicity and selectively damage catecholaminergic cells.

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Crossref · 10.1523/jneurosci.0519-06.2006

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Authors
Mosharov, E. V., Staal, R. G. W., Bové, J., Prou, D., Hananiya, A., Markov, D., Poulsen, N., Larsen, K. E., Moore, C. M. H., Troyer, M. D., Edwards, R. H., Przedborski, S., & Sulzer, D.
Affiliations
  • Columbia University Irving Medical Center (US)
  • University of California, San Francisco (US)
Venue
The Journal of Neuroscience
Published
2006-09-06
Volume
26
Issue
36
Pages
9304-9311
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2160818993
Cited by
165
References
47
Citations by year
2026: 4 · 2025: 3 · 2024: 7 · 2023: 2 · 2022: 9 · 2021: 6 · 2020: 3 · 2019: 4 · 2018: 7 · 2017: 4 · 2016: 6 · 2015: 11 · 2014: 12 · 2013: 9 · 2012: 7
FWCI
10.41
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Defense
  • National Parkinson Foundation
  • Muscular Dystrophy Association
  • National Institutes of Health
  • Parkinsonfonden
  • National Institute on Aging (AG021191, R01AG021191)
  • National Institute of Mental Health
  • National Institute on Drug Abuse
  • National Institute of Neurological Disorders and Stroke
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
alpha-synuclein, Parkinson's disease, dopamine homeostasis, catecholaminergic neurons, A53T alpha-synuclein, chromaffin cells, PC12 cells, proton leak, L-DOPA, oxidative stress, alpha-synuclein overexpression
MeSH terms
Animals, Catecholamines, Cells, Cultured, Cytosol, Gene Expression Regulation, Mice, Transgenic, PC12 Cells, Chromaffin Cells, Mice, Rats, alpha-Synuclein

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