Stat1-dependent, p53-independent expression of p21(waf1) modulates oxysterol-induced apoptosis.
Mol Cell Biol
; 22(7): 1981-92, 2002 Apr.
Article
en En
| MEDLINE
| ID: mdl-11884587
7-Ketocholesterol (7kchol) is prominent in atherosclerotic lesions where apoptosis occurs. Using mouse fibroblasts lacking p53, p21(waf1), or Stat1, we found that optimal 7kchol-induced apoptosis requires p21(waf1) and Stat1 but not p53. Findings were analogous in a human cell system. Apoptosis was restored in Stat1-null human cells when wild-type Stat1 was restored. Phosphorylation of Stat1 on Ser(727) but not Tyr(701) was essential for optimum apoptosis. A neutralizing antibody against beta interferon (IFN-beta) blunted Ser(727) phosphorylation and apoptosis after 7kchol treatment; cells deficient in an IFN-beta receptor subunit exhibited blunted apoptosis. IFN-beta alone did not induce apoptosis; thus, 7kchol-induced release of IFN-beta was necessary but not sufficient for optimal apoptosis. In Stat1-null cells, expression of p21(waf1) was much less than in wild-type cells; introducing transient expression of p21(waf1) restored apoptosis. Stat1 and p21(waf1) were essential for downstream apoptotic events, including cytochrome c release from mitochondria and activation of caspases 9 and 3. Our data reveal key elements of the cellular pathway through which an important oxysterol induces apoptosis. Identification of the essential signaling events that may pertain in vivo could suggest targets for therapeutic intervention.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Transactivadores
/
Proteína p53 Supresora de Tumor
/
Apoptosis
/
Ciclinas
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Proteínas de Unión al ADN
/
Cetocolesteroles
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Mol Cell Biol
Año:
2002
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Estados Unidos