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The Journal of Neuroscience, October 15, 2002, 22(20):8797-8807
Synaptic Vesicle Depletion Correlates with Attenuated Synaptic
Responses to Prolonged Repetitive Stimulation in Mice Lacking
-Synuclein
Deborah E.
Cabin1, *,
Kazuhiro
Shimazu3, *,
Diane
Murphy2,
Nelson B.
Cole1,
Wolfram
Gottschalk3,
Kellie L.
McIlwain4, 5,
Bonnie
Orrison1,
Amy
Chen1,
Christopher E.
Ellis1,
Richard
Paylor4,
Bai
Lu3, and
Robert L.
Nussbaum1
1 Genetic Diseases Research Branch and
2 Neurodegeneration Cluster, National Human Genome Research
Institute, Bethesda, Maryland 20892-4472, 3 Laboratory of
Cellular and Synaptic Neurophysiology, National Institute of Child
Health and Human Development, Bethesda, Maryland 20892-4448, 4 Department of Molecular Genetics, Baylor College of
Medicine, Houston, Texas 77030, and 5 Primal, Inc.,
Seattle, Washington 98104
Although the mutation of -synuclein, a protein associated with
presynaptic vesicles, is implicated in the etiology and pathogenesis of
Parkinson's disease, the biological function of the normal protein is unknown. Mice that lack -synuclein have been generated by
homologous recombination in embryonic stem cells. Electron microscopic
examination of hippocampal synapses revealed a striking selective
deficiency of undocked vesicles without affecting docked vesicles.
Field recording of CA1 synapses in hippocampal slices from the mutant
mice demonstrated normal basal synaptic transmission, paired-pulse
facilitation, and response to a brief train of high-frequency stimulation (100 Hz, 40 pulses) that exhausts only docked vesicles. In
contrast, the -synuclein knock-out mice exhibited significant impairments in synaptic response to a prolonged train of repetitive stimulation (12.5 Hz, 300 pulses) capable of depleting docked as well
as reserve pool vesicles. Moreover, the replenishment of the docked
vesicles by reserve pool vesicles after depletion was slower in the
mutant synapses. Thus, -synuclein may be required for the genesis
and/or maintenance of a subset of presynaptic vesicles, those in the
"reserve" or "resting" pools. These results reveal, for the
first time, the normal function of endogenous -synuclein in
regulating synaptic vesicle mobilization at nerve terminals.
Key words:
-synuclein; genetically engineered mice; docked
synaptic vesicles; reserve pool; readily releasable pool; hippocampus; amphetamine sensitivity
*
D.E.C. and K.S. contributed equally to this work.
Copyright © 2002 Society for Neuroscience 0270-6474/02/22208797-11$05.00/0
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