c-myb has a character of oxidative stress resistance in aged human diploid fibroblasts: regulates SAPK/JNK and Hsp60 pathway consequently.
Biogerontology
; 11(3): 267-74, 2010 Jun.
Article
em En
| MEDLINE
| ID: mdl-19707884
ABSTRACT
This study examined whether c-myb acts as a survival molecule in aged cells. A previous in vitro ageing model suggested that aged cells have a higher cell capacity for survival after exposure to oxidative stress, which involves blockage of the translocation of Hsp60 from the mitochondria to the cytoplasm followed by SAPK/JNK inactivation, than young cells. In human diploid fibroblasts (HDFs), c-myb expression increased gradually with ageing, and this increase had a significant influence on the cell survival capacity after exposure to oxidative stress. To clarify the role of c-myb in oxidative stress, young cells under 21 passages, which lacked c-myb expression, were transfected with adenovirus-mediated c-myb for express c-myb. These c-myb-over-expressed young cells showed increased cell viability upon exposure to oxidative stress to a similar extent to that of the aged cells. In addition, these c-myb-over-expressed young cells did not exhibit SAPK/JNK activation, Hsp60 displacement and cytochrome C release, as was observed in aged cells. The aged cells that had c-myb suppressed using siRNA c-myb showed reduced cell viability and increased apoptosis in a manner to that observed in young cells. From this study, c-myb blocked SAPK/JNK and Hsp60 translocation upon exposure to oxidative stress. This result suggests that c-myb might act as a modulator of cell survival in the ageing process by suppressing apoptosis in aged cells.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Envelhecimento
/
Estresse Oxidativo
/
Chaperonina 60
/
Proteínas Quinases Ativadas por Mitógeno
/
Proteínas Proto-Oncogênicas c-myb
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MAP Quinase Quinase 4
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Diploide
Limite:
Humans
Idioma:
En
Revista:
Biogerontology
Assunto da revista:
GERIATRIA
Ano de publicação:
2010
Tipo de documento:
Article