Hif-2alpha mediates UV-induced apoptosis through a novel ATF3-dependent death pathway.
Cell Death Differ
; 15(9): 1472-80, 2008 Sep.
Article
en En
| MEDLINE
| ID: mdl-18511933
ABSTRACT
In this study, we describe a novel activating transcription factor 3 (ATF3)-dependent death pathway triggered by ultraviolet (UV) irradiation. We demonstrate that ATF3 contributes to UV-induced apoptosis through the regulation of hypoxia inducible factor (Hif)-2alpha expression, which in turn induces the expression of proapoptotic genes, such as Caspase7 or TRAIL (tumor necrosis factor (ligand) superfamily, member 10). Gain of function of Hif-2alpha as well as ATF3 is sufficient to trigger cell death, whereas loss of function of both proteins drastically inhibits UV-induced apoptosis. Repression of Hif-2alpha strongly impairs ATF3-mediated death, providing evidences that Hif-2alpha is the major death effector of ATF3. In addition, Hif-1alpha, already known as a proapoptotic gene, upon UV irradiation, is not able to compensate for the lack of Hif-2alpha expression, thereby confirming the major contribution of Hif-2alpha in UV-mediated cell death. We further demonstrate that this cascade of gene activation depends on p38 and c-Jun N-terminal kinase (JNK) activity. Impairment of such a pathway is likely to contribute to oncogenesis by promoting survival of cells that could accumulate severe chromosomal alterations.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Rayos Ultravioleta
/
Apoptosis
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Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico
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Factor de Transcripción Activador 3
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Cell Death Differ
Año:
2008
Tipo del documento:
Article
País de afiliación:
Francia