Neuroprotection by S-nitrosoglutathione of brain dopamine neurons from oxidative stress

Pekka Rauhala, Anya M.Y. Lin, Chuang C. Chiueh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

154 Scopus citations

Abstract

The proposed anti- and pro-oxidant effects of nitric oxide (NO) derivatives, such as S-nitrosoglutathione (GSNO) and peroxynitrite, were investigated in the rat nigrostriatal dopaminergic system. Intranigral infusion of freshly prepared GSNO (0-16.8 nmol, i.n.) prevented iron-induced (4.2 nmol, i.n.) oxidative stress and nigral injury, reflected by a decrease in striatal dopamine levels. This neuroprotective effect of GSNO was verified by ex vivo imaging of brain dopamine uptake sites using 125I-labeled RTI- 55. In addition, in vitro data indicate that GSNO concentration-dependently inhibited iron-evoked hydroxyl radical generation and brain lipid peroxidation. In this iron-induced oxidant stress model, GSNO was approximately 100-fold more potent than the antioxidant glutathione (GSH). Light-exposed, NO-exhausted GSNO produced neither antioxidative nor neuroprotective effects, which indicates that NO may mediate at least part of GSNO's effects. Moreover, GSNO completely (and GSH only partially) inhibited the weak pro-oxidant effect of peroxynitrite, which produced little injury to nigral neurons in vivo. This study provides relevant in vivo evidence suggesting that nanomol GSNO can protect brain dopamine neurons from iron- induced oxidative stress and degeneration. In conclusion, S-nitrosylation of GSH by NO and oxygen may be part of the antioxidative cellular defense system.

Original languageEnglish
Pages (from-to)165-173
Number of pages9
JournalFASEB Journal
Volume12
Issue number2
DOIs
StatePublished - 1998

Keywords

  • Hydroxyl radical
  • Lipid peroxidation
  • Nitric oxide
  • Parkinson's disease
  • Peroxynitrite

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