p53-dependent apoptosis and transcription of p21waf/cip1/sdi1 in SCID mice following gamma-irradiation.
Biochimie
; 79(9-10): 607-12, 1997 Oct.
Article
em En
| MEDLINE
| ID: mdl-9466699
ABSTRACT
The recruitment and activation of DNA-repair mechanisms at the sites of DNA-damage after exposure of cells to genotoxic stress are poorly understood. The DNA-dependent kinase (DNA-PK) was considered to be a likely candidate for initiating these events because of the conditions required for its activation, its phosphorylation of p53 in vitro and the extreme radiosensitivity induced by its inactivation in vivo. We analyzed irradiation-induced p53-activation in SCID mice, which lack DNA-PK activity, and found that p53-dependent apoptosis and p21waf/cip1/sdi1 transcription in these animals are at least as efficient as in wild-type mice. Thus, our results show that DNA-PK is not the main sensor for genotoxic stress and is not required for p53 activation. In fact, they rather suggest that DNA-PK may play a role in p53 down-regulation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Transcrição Gênica
/
Proteína Supressora de Tumor p53
/
Apoptose
/
Ciclinas
/
Proteínas de Ligação a DNA
Limite:
Animals
Idioma:
En
Revista:
Biochimie
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Estados Unidos