Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5855446 | NeuroToxicology | 2011 | 7 Pages |
α-Synuclein (α-Syn) plays a crucial role in the pathophysiology of Parkinson's disease (PD). α-Syn has been extensively studied in many neuronal cell-based PD models but has yielded mixed results. The objective of this study was to re-evaluate the dual cytotoxic/protective roles of α-Syn in dopaminergic SH-SY5Y cells. Stable SH-SY5Y cells overexpressing wild type or familial α-Syn mutants (A30P, E46K and A53T) were subjected to acute and chronic rotenone and maneb treatment. Compared with untransfected SH-SY5Y cells, wild type α-Syn attenuated rotenone and maneb-induced cell death along with an attenuation of toxin-induced mitochondrial membrane potential changes and Reactive Oxygen Species level, whereas the mutant α-Syn constructs exacerbated environmental toxins-induced cytotoxicity. After chronic treatment, wild type α-Syn but not the mutant variants was found to rescue cells from subsequent acute hydrogen peroxide insult. These results suggest that the fundamental property of wild type α-Syn may be protective, and such property may be lost by its familial PD mutations.
⺠α-Syn gene-environment interaction was studied in dopaminergic SH-SY5Y cells. ⺠wt α-Syn attenuated rotenone and maneb cytotoxicity, with reduced ÎΨm and ROS level. ⺠Mutants A30P, E46K, A53T exacerbated environmental toxins-induced cytotoxicity. ⺠Fundamental property of wt α-Syn is protective and is lost by familial PD mutations.