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Nitric oxide potentiates TNF-α-induced neurotoxicity through suppression of NF-κB.

Abstract：

:Modulation of enzyme activity through nitrosylation has recently been identified as a new physiological activity of nitric oxide (NO). We hypothesized that NO enhances the TNF-α-induced death of retinal neurons through a suppression of nuclear factor-κB (NF-κB) by nitrosylation. In this study, cells from the RGC-5 line were exposed to different concentrations (2.0, 10, and 50 ng/ml) of TNF-α, and the degree of TNF-α-induced cell death was determined by the WST-8 assay and by flow cytometric measurements of the externalization of phosphatidylserine. The effects of etanercept, a soluble TNFR-Fc fusion protein, and S-nitroso-N-penicillamine (SNAP), an NO donor, on the toxicity were determined. Experiments were also performed to determine whether nitric oxide synthase (NOS) was associated with the toxicity of TNF-α. The activation of NF-κB was determined by the detection of the p65 subunit in the nuclear extracts. Our results showed that exposure of RGC-5 cells to different concentrations of TNF-α significantly decreased the number of living cells in a dose-dependent way. The death was partially due to apoptosis with an externalization of phosphatidylserine, and the death was suppressed by etanercept. Exposure to TNF-α increased the activation of NF-κB and the expression of iNOS. Although NF-κB inhibitors suppressed the increase of iNOS, they also potentiated the TNF-α-induced death. Both L-NAME and aminoguanidine, both NOS inhibitors, rescued the cells from death. In contrast, addition of SNAP caused nitrosylation of the inhibitory κB kinase, and suppressed the NF-κB activation and potentiated the TNF-α-induced neurotoxicity. These results indicate that NO potentiates the neurotoxicity of TNF-α by suppressing NF-κB.

journal_name

Cell Mol Neurobiol

journal_title

Cellular and molecular neurobiology

authors

Nakaizumi A,Horie T,Kida T,Kurimoto T,Sugiyama T,Ikeda T,Oku H

doi

10.1007/s10571-011-9739-5

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

95-106

issue

1

eissn

0272-4340

issn

1573-6830

journal_volume

32

pub_type

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