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A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
Published on: August 12, 2018
El gen oncogénico y del grupo Polycomb bmi-1 regula la proliferación celular y la senescencia a través del locus
J J Jacobs1, K Kieboom, S Marino
1Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam.
Nature
|January 29, 1999
Resumen
El gen bmi-1, una proteína del grupo Polycomb, regula la progresión del ciclo celular y la senescencia. Su ausencia causa defectos, mientras que su sobreexpresión conduce a linfomas y cáncer, destacando su papel en la supresión de tumores.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Investigación de Investigación del Cáncer.
Sus antecedentes:
- Bmi-1 es una proteína del grupo de Polycomb involucrada en el silenciamiento de genes durante el desarrollo.
- La desregulación de Bmi-1 está relacionada con el cáncer y las anomalías del desarrollo.
- Las proteínas del grupo Polycomb mantienen una represión génica estable, crucial para el desarrollo.
Objetivo del estudio:
- Investigar el papel de bmi-1 en el control del ciclo celular y la senescencia.
- Para identificar los objetivos in vivo de Bmi-1.
- Para dilucidar la conexión entre las proteínas del grupo Polycomb, la regulación del ciclo celular y la senescencia.
Principales métodos:
- Análisis de fibroblastos y linfocitos embrionarios de ratón con deficiencia de bmi-1.
- Evaluación de la progresión del ciclo celular y los marcadores de senescencia.
- Análisis de la expresión génica de los supresores tumorales p16 y p19Arf (codificado por ink4a).
- Evaluación de los efectos de la sobreexpresión de bmi-1 en la inmortalización y transformación de los fibroblastos.
Principales resultados:
- La deficiencia de bmi-1 afecta la progresión del ciclo celular e induce la senescencia prematura en los fibroblastos.
- La deficiencia de bmi-1 conduce a una mayor expresión de los supresores tumorales p16 y p19Arf.
- La sobreexpresión de bmi-1 promueve la inmortalización de los fibroblastos y la transformación neoplásica.
- La eliminación de la tinta4a rescata los defectos linfoides y neurológicos en ratones con deficiencia de bmi-1.
Conclusiones:
- Bmi-1 actúa como un represor de la transcripción que vincula las proteínas del grupo Polycomb con el control del ciclo celular y la senescencia.
- Ink4a es un gen objetivo crítico in vivo regulado por Bmi-1.
- Bmi-1 juega un papel importante en la prevención de la senescencia prematura y el mantenimiento del desarrollo normal.
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