Toxic effects of sulphite in combination with peroxynitrite on neuronal cells.

Abstract

Sulphite is widely used as a preservative and antioxidant in foods, beverages, and pharmaceuticals. Endogenous sulphite is generated during the normal metabolism of sulphur-containing amino acids, and alterations in sulphur amino acid metabolism occur in some neurodegenerative diseases. In particular, sulphite oxidase deficiency produces severe mental retardation, seizures, spastic quadriparesis, dislocated lenses, and early death. Exposure of a neuronal cell line (rat mesencephalic cells) to high levels of sulphite induced a time-dependent decrease in viability. Peroxynitrite was also toxic to this cell line, and sulphite affected the toxicity of ONOO-. Sulphite concentrations of < or = 0.5 mM markedly potentiated cell damage induced by 200 microM ONOO-. We propose that sulphite can act as a neurotoxic agent, especially in combination with peroxynitrite. Sulphite radicals may be involved in the neurotoxic effect.

• Authors: M Reist, K A Marshall, P Jenner, B Halliwell
• Journal: Journal of neurochemistry (J Neurochem) Vol. 71 Issue 6 Pg. 2431-8 (Dec 1998) ISSN: 0022-3042 [Print] England
• PMID: 9832141 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Drug Combinations
• Nitrates
• Oxidants
• Sulfites
• peroxynitric acid
• 3-nitrotyrosine
• Tyrosine

Topics

• Animals
• Cell Line
• Cell Survival (drug effects)
• DNA Fragmentation
• Drug Combinations
• Neurons (drug effects, physiology)
• Nitrates (poisoning)
• Oxidants (poisoning)
• Rats
• Sulfites (poisoning)
• Tyrosine (analogs & derivatives, biosynthesis, metabolism)