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Proteasome activation and nNOS down-regulation in neuroblastoma cells expressing a Cu,Zn superoxide dismutase mutant involved in familial ALS.

Abstract：

:Reactive oxygen and nitrogen species have emerged as predominant effectors of neurodegeneration. We demonstrated that expression of the fully active G93A Cu,Zn superoxide dismutase mutant in neuroblastoma cells is associated with an increased level of oxidatively modified proteins, in terms of carbonylated residues. A parallel increase in proteasome activity was detected and this was mandatory in order to assure cell viability. In fact, proteasome inhibition by lactacystin or MG132 resulted in programmed cell death. Nitrosative stress was not involved in the oxidative unbalance, as a decrease in neuronal nitric oxide production and down-regulation of neuronal nitric oxide synthase (nNOS) level were detected. The nNOS down-regulation was correlated to increased proteolytic degradation by proteasome, because comparable levels of nNOS were detected in G93A and parental cells upon treatment with lactacystin. The altered rate of proteolysis observed in G93A cells was specific for nNOS as Cu,Zn superoxide dismutase (Cu,Zn SOD) degradation by proteasome was influenced neither by its mutation nor by increased proteasome activity. Treatment with the antioxidant 5,5'-dimethyl-1-pyrroline N-oxide resulted in inhibition of protein oxidation and decrease in proteasome activity to the basal levels. Overall these results confirm the pro-oxidant activity of G93A Cu,Zn SOD mutant and, at the same time, suggest a cross-talk between reactive oxygen and nitrogen species via the proteasome pathway.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Aquilano K,Rotilio G,Ciriolo MR

doi

10.1046/j.1471-4159.2003.01783.x

keywords:

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

1324-35

issue

5

eissn

0022-3042

issn

1471-4159

pii

1783

journal_volume

85

pub_type

杂志文章

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