Accumulation of labile zinc in neurons and astrocytes in the spinal cords of G93A SOD-1 transgenic mice.
Neurobiol Dis
; 34(2): 221-9, 2009 May.
Article
em En
| MEDLINE
| ID: mdl-19344646
ABSTRACT
Zinc dyshomeostasis may trigger oxidative stress, which is likely the key mechanism of neuronal death in amyotrophic lateral sclerosis (ALS), including familial forms such as G93A SOD-1 ALS. Since zinc binding by G93A SOD-1 is weaker than by normal SOD-1, we assessed whether labile zinc levels are altered in the spinal cords of G93A SOD-1 transgenic (Tg) mice. Whereas no zinc-containing cells were found in wild-type (WT) mice, neurons and astrocytes with high levels of labile zinc appeared in G93A SOD-1 Tg mice, in correlation with motoneuron degeneration. The level of HNE, an endogenous neurotoxic molecule, was increased around zinc-accumulating cells and mSOD-1 positive cells, suggesting a link between HNE, SOD-1 mutation and zinc accumulation. Moreover, exposure of cultured spinal neurons and astrocytes from G93A SOD-1 Tg mice to HNE increased labile zinc levels, and exposure to zinc increased 4-hydroxynonenal (HNE) levels, to a greater degree than in WT neurons and astrocytes. Administration of the zinc chelator TPEN extended survival in G93A SOD-1 Tg mice. These results indicate that zinc dyshomeostasis occurs in the spinal cords of Tg mice, and that this dyshomeostasis may contribute to motoneuron degeneration.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Medula Espinal
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Superóxido Dismutase
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Zinco
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Astrócitos
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Esclerose Lateral Amiotrófica
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Neurônios Motores
Limite:
Animals
Idioma:
En
Revista:
Neurobiol Dis
Assunto da revista:
NEUROLOGIA
Ano de publicação:
2009
Tipo de documento:
Article