Abstract
Parkinson’s disease (PD) is a chronic progressive neurodegenerative movement disorder characterized by the selective loss of nigrostriatal dopaminergic neurons. However, the molecular pathways leading to the dopaminergic neuron degeneration have remained obscure until recently. Reports demonstrated that reduction of brain-derived neurotrophic factor (BDNF) was involved in the etiology and pathogenesis of PD, but its mechanism has not been elucidated. α-Synuclein has a causal role in Parkinson’s disease, and could interfere with transcriptional regulation of dopamine neurons. In this study, α-synuclein overexpression was found to decrease the expression of BDNF, and also to suppress the transactivation of nuclear factors of activated T-cells (NFAT) and cAMP response element binding protein (CREB), both of which regulate BDNF expression. Furthermore, overexpressed α-synuclein could associate with protein kinase C (PKC) and impair its activity. Meanwhile glycogen synthase kinase-3β (GSK3β) was activated and extracellular signal-regulated protein kinase (ERK) activity was inhibited by overexpression of α-synuclein; both of them were downstream kinases of PKC. Therefore, the impaired PKC signal pathway caused by α-synuclein overexpression might account at least partially for the down-regulation of BDNF.
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Abbreviations
- BDNF:
-
Brain-derived neurotrophic factor
- NFAT:
-
Nuclear factor of activated T-cells
- MPP+ :
-
1-Methyl, 4-pheny1, pyridinium
- GSK3β:
-
Glycogen synthase kinase 3β
- PD:
-
Parkinson’s disease
- MPTP:
-
1-Methyl, 4-phenyl, 1,2,3,6-tetrahydropyridine
- PKC:
-
Protein kinase C
- CREB:
-
cAMP response element binding protein
- ERK:
-
Extracellular signal-regulated protein kinases
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Acknowledgments
The authors thank Professor Perlmann from Ludwig Institute for Cancer Research for kindly donating the NBRE3x constructs. This work was supported by National Key Basic Research & Development Program (973 project Grant No. 2004CB518906), Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT No.IRT0514), the National Natural Science Foundation of China (No. 30572342 and NO. 30271499) and Special Purpose for New Drug Development (2009ZX09303).
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Yuan, Y., Sun, J., Zhao, M. et al. Overexpression of α-Synuclein Down-Regulates BDNF Expression. Cell Mol Neurobiol 30, 939–946 (2010). https://doi.org/10.1007/s10571-010-9523-y
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DOI: https://doi.org/10.1007/s10571-010-9523-y