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Updated: May 11, 2026
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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
La PML regula la acetilación de p53 y la senescencia prematura inducida por el Ras oncogénico
M Pearson1, R Carbone, C Sebastiani
1European Institute of Oncology, Department of Experimental Oncology, Milan, Italy.
Nature
|July 26, 2000
Resumen
La proteína de la leucemia promyelocítica (PML) regula el supresor del tumor p53.
Área de la Ciencia:
- Oncología Oncología.
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
Sus antecedentes:
- El supresor de tumores p53 induce la senescencia celular en respuesta a las señales oncogénicas.
- La actividad de p53 está modulada por la estabilidad de la proteína y la modificación post-traducional, incluida la fosforilación y la acetilación.
- El mecanismo de activación de p53 por oncogenes sigue siendo en gran medida desconocido.
Objetivo del estudio:
- Investigar el papel del supresor tumoral PML en la regulación de la respuesta p53 a las señales oncogénicas.
- Para dilucidar el mecanismo por el cual Ras oncogénico activa p53.3.
- Determinar el requisito de los cuerpos nucleares de PML para la acetilación y la senescencia de p53.
Principales métodos:
- Sobreexpresión de PML y Ras oncogénico en los fibroblastos.
- Análisis de la acetilación de p53 en la lisina 382.2.
- Inmunofluorescencia para estudiar la re-localización de p53 y CBP.
- Coinmunoprecipitación para detectar la formación del complejo p53-PML-CBP.
- Estudios en fibroblastos PML-/- para evaluar la necesidad de PML.
Principales resultados:
- El Ras oncogénico regula la expresión de la LMP.
- La sobreexpresión de la LMP induce la senescencia dependiente de p53.
- Ras induce la acetilación de p53 en la lisina 382, esencial para su función.
- Ras promueve la re-localización de p53 y CBP en los cuerpos nucleares de PML, formando un complejo p53-PML-CBP.
- La acetilación de p53 inducida por Ras, la estabilización compleja y la senescencia se eliminan en los fibroblastos PML-/-.
Conclusiones:
- El supresor del tumor PML regula la respuesta de p53 a las señales oncogénicas.
- Los cuerpos nucleares de PML son esenciales para la acetilación de p53 y la posterior inducción de la senescencia en la expresión de oncogenes.
- Se establece un vínculo directo entre la PML y la acetilación y la senescencia de p53.
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