Abstract
α-Synuclein plays a key role in the pathological neurodegeneration in Parkinson’s disease. Although its contribution to normal physiology remains elusive, the selective degeneration of α-synuclein-containing dopaminergic neurons in Parkinson’s disease may be linked to abnormal α-synuclein induced toxicity. In the present study, a complex of α-synuclein and vesicular monoamine transporter-2 was identified by GST-Pull Down experiment. In wild-type α-synuclein stably transfected SH-SY5Y cell lines, the activity of vesicular monoamine transporter-2 decreased by 31% as determined by [3H] dopamine uptake, and its expression also decreased in both protein and mRNA levels using western and northern blot analysis. Overexpression of wild-type α-synuclein did not induce cell death or apoptosis, but significantly enhanced the intracellular reactive oxygen species level as assayed by flow cytometry. These data suggest that Up-regulated α-synuclein expression inhibits the activity of vesicular monoamine transporter-2, thereby interrupting dopamine homeostasis and resulting in dopaminergic neuron injury in Parkinson’s disease.







Abbreviations
- PD:
-
Parkinson’s disease
- VMAT2:
-
Vesicular monoamine transporter-2
- ROS:
-
Reactive oxygen species
- TH:
-
Tyrosine hydroxylase
- DAT:
-
Dopamine transporter
- DA:
-
Dopamine
- PBS:
-
Phosphate-buffered saline
- PVDF:
-
Polyvinylidene difluoride
- MAO:
-
Monoamine oxidase
- MPTP:
-
1-Methyl- 4-phenyl-1,2,3,6-tetrahydropyridine
- MPP+ :
-
1-Methyl-4-phenylpyridinium
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Acknowledgments
We thank Pro. Biao Chen (Xuanwu hospital, Beijing China) for providing the wild-type α-synuclein cDNA and Yu Hu (Peking Union Medical College, Being, China) for her excellent technical support in the radioactive experiment.
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Guo, J.T., Chen, A.Q., Kong, Q. et al. Inhibition of Vesicular Monoamine Transporter-2 Activity in α-Synuclein Stably Transfected SH-SY5Y Cells. Cell Mol Neurobiol 28, 35–47 (2008). https://doi.org/10.1007/s10571-007-9227-0
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DOI: https://doi.org/10.1007/s10571-007-9227-0