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p63 y p73 son necesarios para la apoptosis dependiente de p53 en respuesta al daño del ADN

Elsa R Flores¹, Kenneth Y Tsai, Denise Crowley

¹Massachusetts Institute of Technology, Department of Biology and Center for Cancer Research, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

|April 5, 2002

Resumen

El gen supresor de tumores p53 es crucial para la respuesta al daño del ADN. La pérdida de p63 y p73 evita la apoptosis inducida por daño al ADN, incluso con p53 funcional, destacando sus funciones esenciales.

Área de la Ciencia:

Biología Molecular Biología Molecular
Investigación del cáncer Investigación del cáncer.
Biología celular Biología celular.

Sus antecedentes:

El gen supresor de tumores p53 juega un papel vital en las respuestas celulares al daño del ADN y es frecuentemente mutado en los cánceres humanos.
Los miembros de la familia p53, p63 y p73, son estructuralmente similares a p53 y están implicados en la apoptosis, pero su vínculo directo con la supresión tumoral es menos claro.

Objetivo del estudio:

Investigar el papel de p63 y p73 en la apoptosis inducida por daño al ADN, dada su similitud estructural con p53 y la capacidad de transactivar los genes diana de p53.
Para determinar si p63 y p73 son esenciales para la apoptosis en respuesta al daño del ADN, particularmente en el contexto de la p53 funcional.

Principales métodos:

Se utilizaron fibroblastos embrionarios de ratón deficientes en uno o una combinación de miembros de la familia p53.
Empleó el oncogén del adenovirus E1A para sensibilizar las células para la inducción de la apoptosis y facilitar los análisis bioquímicos.
Se examinaron las funciones de p63 y p73 utilizando modelos in vitro (sistema E1A) e in vivo en los que la apoptosis es p53-dependiente.

Principales resultados:

La ausencia combinada de p63 y p73 condujo a una falla en la apoptosis inducida por daño al ADN.
Esta falla se produjo incluso en células que poseen p53 funcional, lo que indica un papel crítico para p63 y p73 más allá de la función directa de p53.
Se demostró que p63 y p73 son esenciales para iniciar la apoptosis después del daño al ADN.

Conclusiones:

p63 y p73 son indispensables para la apoptosis inducida por daño al ADN.
La pérdida de p63 y p73 compromete los mecanismos de defensa celular contra el daño del ADN, independientemente del estado funcional de p53.
Estos hallazgos revelan un papel cooperativo crítico para la familia p53 en el mantenimiento de la integridad genómica y la prevención del desarrollo del cáncer.

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