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PRAK es esencial para la senescencia inducida por ras y la supresión tumoral
Peiqing Sun1, Naoto Yoshizuka, Liguo New
1Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. pqsun@scripps.edu
Cell
|January 27, 2007
Resumen
La senescencia inducida por oncogenes, un supresor tumoral, está mediada por la proteína quinasa regulada/activada por p38 (PRAK). La activación de PRAK por p38 en respuesta a ras oncogénico promueve la senescencia, inhibiendo el desarrollo de tumores.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Investigación de Investigación del Cáncer.
Sus antecedentes:
- La senescencia inducida por oncogenes es un mecanismo crítico de supresión de tumores, similar a la apoptosis.
- Las vías de señalización específicas que median la senescencia no se comprenden completamente.
- La proteína quinasa regulada/activada por p38 (PRAK), un sustrato de la MAPK p38, tiene funciones fisiológicas poco definidas.
Objetivo del estudio:
- Para dilucidar el papel de la PRAK en la supresión de tumores.
- Investigar la participación de PRAK en la senescencia inducida por oncogenes.
- Identificar los objetivos y los mecanismos posteriores de la señalización de PRAK en la senescencia.
Principales métodos:
- Se utilizaron modelos de ratón de la carcinogénesis de la piel (inducida por DMBA).
- Investigó la función de la PRAK en las células primarias y su papel en la transformación oncogénica.
- Examinó la interacción directa y la fosforilación de p53 por PRAK in vitro e in vivo.
Principales resultados:
- La deficiencia de PRAK en ratones condujo a un aumento de la carcinogénesis de la piel y al deterioro de la inducción de la senescencia.
- La inactivación de PRAK en las células primarias abrogó la senescencia y promovió la transformación oncogénica.
- Se demostró que PRAK fosforila directamente y activa p53.
Conclusiones:
- PRAK actúa como mediador de la senescencia inducida por oncogenes tras la activación por p38 MAPK.
- El PRAK juega un papel importante en la supresión de tumores al promover la senescencia.
- El eje PRAK-p53 es una vía clave en la senescencia inducida por ras y la supresión tumoral.
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