N-actylcysteine protects Chinese hamster ovary (CHO) cells from lead-induced oxidative stress.
Toxicology
; 108(1-2): 57-64, 1996 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-8644118
ABSTRACT
In vitro administration of lead acetate (PbA) to cultures of Chinese hamster ovary (CHO) cells had a concentration-dependent inhibitory effect on colony formation. Colony formation was returned to control levels in lead-treated cultures that were supplemented with 1 mM N-actylcysteine (NAC), a well-documented synthetic antioxidant. In order to investigate the nature of NAC's protective effect, we measured L-gamma-glutamyl-L-cysteinylglycine (GSH), oxidized glutathione (GSSG), malondialdehyde (MDA) and catalase activity both in the presence and absence of NAC in lead-exposed CHO cells. Increases in both MDA levels (p < 0.05) and catalase activity (P < 0.05) were observed in cultures that received only PbA, but supplementation with NAC returned these measures to pretreatment levels. The ratio of GSH to GSSG increased in lead-exposed cells incubated in NAC-enhanced media, but declined in cultures treated with PbA only. Our results suggest that NAC can confer protection against lead-induced oxidative stress to CHO cells, possibly through the enhancement of the cell's own antioxidant defense mechanisms.
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Base de dados:
MEDLINE
Assunto principal:
Compostos Organometálicos
/
Acetilcisteína
/
Sequestradores de Radicais Livres
/
Chumbo
Idioma:
En
Revista:
Toxicology
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Estados Unidos