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Las funciones inhibidoras del crecimiento y supresoras de tumores de p53 dependen de su represión de la expresión de
Samuel Godar1, Tan A Ince, George W Bell
1Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.
Cell
|July 11, 2008
Resumen
La proteína supresora de tumores p53 inhibe la expresión de CD44 bajo estrés. La pérdida de la función p53 promueve el crecimiento tumoral al aumentar los niveles de CD44, destacando el CD44 como promotor tumoral.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Oncología Oncología.
Sus antecedentes:
- El supresor tumoral p53 es crucial para las respuestas de estrés celular.
- CD44 es una molécula de la superficie celular involucrada en la adhesión y migración celular.
- La desregulación de p53 y CD44 está implicada en el desarrollo del cáncer.
Objetivo del estudio:
- Para investigar la relación reguladora entre la expresión de p53 y CD44.
- Para determinar el papel de CD44 en las células tumorales con deficiencia de p53.
- Explorar las implicaciones de esta interacción en la progresión del cáncer.
Principales métodos:
- Análisis de la unión de p53 al promotor de CD44.
- Medición de la expresión de CD44 en células con función p53 variable.
- Evaluación del crecimiento celular y la capacidad de iniciar un tumor.
Principales resultados:
- p53 inhibe directamente la expresión de CD44 al unirse a su promotor.
- La pérdida de la función p53 conduce a un aumento de la expresión de CD44.
- El aumento de CD44 es esencial para el crecimiento de las células tumorales mamarias con deficiencia de p53.
- La expresión de CD44 está regulada positivamente por p63, un parálogo de p53.
Conclusiones:
- CD44 actúa como promotor tumoral en las células que carecen de p53.
- La inactivación de p53 y la subsiguiente desrepresión de CD44 puede facilitar la supervivencia de las células premalignas.
- Dirigirse a CD44 podría ser una estrategia terapéutica para los cánceres con mutación p53.
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