Dopamine auto-oxidation aggravates non-apoptotic cell death induced by over-expression of human A53T mutant alpha-synuclein in dopaminergic PC12 cells
Article first published online: 27 NOV 2008
© 2008 The Authors. Journal Compilation © 2008 International Society for Neurochemistry
Journal of Neurochemistry
Volume 108, Issue 3, pages 601–610, February 2009
How to Cite
Zhou, Z. D., Kerk, S. Y., Xiong, G. G. and Lim, T. M. (2009), Dopamine auto-oxidation aggravates non-apoptotic cell death induced by over-expression of human A53T mutant alpha-synuclein in dopaminergic PC12 cells. Journal of Neurochemistry, 108: 601–610. doi: 10.1111/j.1471-4159.2008.05795.x
- Issue published online: 9 JAN 2009
- Article first published online: 27 NOV 2008
- Received September 10, 2008; revised manuscript received November 1, 2008; accepted November 4, 2008.
- non-apoptotic cell death;
- Parkinson’s disease;
- PC12 cells;
- rescuing strategies
In this study, we demonstrated that transient transfection and over-expression of human mutant A53T alpha-synuclein (α-syn) could induce expression level- and time-dependent, non-apoptotic cell death in PC12 cells, while wild-type and mutant A30P α-syn could not. The non-apoptotic cell death induced by over-expression of A53T α-syn in PC12 cells was found to be dopamine (DA) related. It could be alleviated by nerve growth factor but not by chemicals that abrogate endoplasmic reticulum stress. Furthermore, PC12 cell death could be alleviated by N-acetyl-cysteine (NAC) as well as by l-cysteine; but not by cell permeable tyrosinase inhibitors. NAC could prevent DA auto-oxidation and tyrosinase-catalyzed DA oxidation, whereas l-cysteine could potently abrogate DA auto-oxidation but could not prevent tyrosinase-catalyzed DA oxidation. Both NAC and l-cysteine could increase the reduced and total GSH levels, and concurrently decrease the oxidized GSH level in PC12 cells. On the other hand, over-expression of human mutant A53T α-syn could decrease the reduced and total GSH levels, and increase the oxidized GSH level in the cells. Taken together, we concluded that auto-oxidation of endogenous DA aggravates non-apoptotic cell death induced by over-expression of human mutant A53T α-syn in PC12 cells.