N-acetylcysteine attenuates arsenite-induced oxidative injury in dorsal root ganglion explants.

Abstract:

:Chronic exposure to arsenic causes health problems, including peripheral neuropathy. Oxidative stress is one of the mechanisms underlying arsenic-induced neurotoxicity. For this report, we studied the protective effect of N-acetylcysteine (NAC) on arsenic-induced oxidative injury in dorsal root ganglion (DRG) explants. After 24-h incubation, NAC concentration-dependently attenuated arsenite-induced depletion in glutathione (GSH) content and increases in the ratio of oxidized GSH/reduced GSH (GSSG/GSH ratio) in DRG explants. Furthermore, NAC inhibited arsenite-induced elevation in the expression of stress proteins, such as heat shock protein 70 and heme oxygenase 1, as well as arsenite-induced phosphorylation of p38 mitogen-activated protein kinase. Incubation with NAC ameliorated arsenite-induced apoptosis by abolishing both mitochondrial and endoplasmic reticulum (ER) pathways. In the mitochondrial pathway, NAC attenuated arsenite-induced elevation in Bcl-2 level and cytosolic cytochrome c, as well as arsenite-induced reduction in procaspase-3 levels. In the ER pathway, NAC suppressed arsenite-induced increases in activating transcription factor 6 and C/EBP homologous protein in the nuclear fraction. Furthermore, arsenite-induced reductions in procaspase-12 and elevation in BIP and caspase-12, an ER-specific enzyme, were prevented after NAC incubation. Taken together, our results demonstrate that NAC is neuroprotective against arsenite-induced oxidative injury in DRG explants. Furthermore, NAC inhibits arsenite-induced toxicity by inhibiting ER and mitochondrion activation. Our data indicate that NAC is potentially therapeutic for arsenite-induced peripheral neuropathy.

journal_name

Ann N Y Acad Sci

authors

Chao PL,Fan SF,Chou YH,Lin AM

doi

10.1196/annals.1403.020

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

276-88

eissn

0077-8923

issn

1749-6632

pii

1122/1/276

journal_volume

1122

pub_type

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