Hepatitis C virus core protein inhibits mitochondrial electron transport and increases reactive oxygen species (ROS) production.
J Biol Chem
; 280(45): 37481-8, 2005 Nov 11.
Article
em En
| MEDLINE
| ID: mdl-16150732
ABSTRACT
Hepatitis C infection causes a state of chronic oxidative stress, which may contribute to fibrosis and carcinogenesis in the liver. Previous studies have shown that expression of the HCV core protein in hepatoma cells depolarized mitochondria and increased reactive oxygen species (ROS) production, but the mechanisms of these effects are unknown. In this study we examined the properties of liver mitochondria from transgenic mice expressing HCV core protein, and from normal liver mitochondria incubated with recombinant core protein. Liver mitochondria from transgenic mice expressing the HCV proteins core, E1 and E2 demonstrated oxidation of the glutathione pool and a decrease in NADPH content. In addition, there was reduced activity of electron transport complex I, and increased ROS production from complex I substrates. There were no abnormalities observed in complex II or complex III function. Incubation of control mitochondria in vitro with recombinant core protein also caused glutathione oxidation, selective complex I inhibition, and increased ROS production. Proteinase K digestion of either transgenic mitochondria or control mitochondria incubated with core protein showed that core protein associates strongly with mitochondria, remains associated with the outer membrane, and is not taken up across the outer membrane. Core protein also increased Ca(2+) uptake into isolated mitochondria. These results suggest that interaction of core protein with mitochondria and subsequent oxidation of the glutathione pool and complex I inhibition may be an important cause of the oxidative stress seen in chronic hepatitis C.
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Base de dados:
MEDLINE
Assunto principal:
Mitocôndrias Hepáticas
/
Espécies Reativas de Oxigênio
/
Hepacivirus
/
Complexo I de Transporte de Elétrons
/
Antígenos do Núcleo do Vírus da Hepatite B
Limite:
Animals
Idioma:
En
Revista:
J Biol Chem
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Estados Unidos