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A dual role for α-synuclein in facilitation and depression of dopamine release from substantia nigra neurons in vivo
- Source :
- Proceedings of the National Academy of Sciences of the United States of America, vol 117, iss 51, Proceedings of the National Academy of Sciences of the United States of America
- Publication Year :
- 2020
- Publisher :
- eScholarship, University of California, 2020.
-
Abstract
- Significance We report a long-sought& in vivo& physiological role for& α-synuclein (α-syn) in dopamine signaling. The results indicate that& α-syn is critical for activity-dependent dopamine plasticity, and that short repeated burst activity produces rapid presynaptic facilitation, while prolonged burst activity slowly depresses evoked dopamine release. We propose that the rapid facilitation is due to an enhanced fusion of synaptic vesicles at active zones during exocytosis while the depression is due to synaptic exhaustion. These results identify a& dynamic role of& α-syn, and are critical for defining& molecular mechanisms and therapeutic targets for various neurological disorders, where the firing properties of neurons are severely altered.<br />α-Synuclein is expressed at high levels at presynaptic terminals, but defining its role in the regulation of neurotransmission under physiologically relevant conditions has proven elusive. We report that, in vivo, α-synuclein is responsible for the facilitation of dopamine release triggered by action potential bursts separated by short intervals (seconds) and a depression of release with longer intervals between bursts (minutes). These forms of presynaptic plasticity appear to be independent of the presence of β- and γ-synucleins or effects on presynaptic calcium and are consistent with a role for synucleins in the enhancement of synaptic vesicle fusion and turnover. These results indicate that the presynaptic effects of α-synuclein depend on specific patterns of neuronal activity.
- Subjects :
- 0301 basic medicine
Male
Dopamine
animal diseases
Neurodegenerative
Inbred C57BL
Mice
chemistry.chemical_compound
0302 clinical medicine
gamma-Synuclein
Premovement neuronal activity
Mice, Knockout
Neurons
Neurotransmitter Agents
Multidisciplinary
Isoflurane
Depression
Biological Sciences
Substantia Nigra
Mental Health
Inhalation
Neurological
Anesthetics, Inhalation
Facilitation
alpha-Synuclein
Female
Synaptic Vesicles
dopamine
medicine.drug
Knockout
1.1 Normal biological development and functioning
chemistry.chemical_element
Substantia nigra
Calcium
Neurotransmission
03 medical and health sciences
In vivo
medicine
Animals
Calcium Signaling
in vivo neurotransmission
Anesthetics
Alpha-synuclein
Dopaminergic Neurons
Neurosciences
Brain Disorders
nervous system diseases
Mice, Inbred C57BL
030104 developmental biology
chemistry
nervous system
Neuroscience
030217 neurology & neurosurgery
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America, vol 117, iss 51, Proceedings of the National Academy of Sciences of the United States of America
- Accession number :
- edsair.doi.dedup.....9f87d71d9786547be30f188628713b1d