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Control de la proliferación celular por las memorias de la mitosis
Franz Meitinger1,2,3,4, Hazrat Belal4, Robert L Davis5
1Department of Cell and Developmental Biology, School of Biological Sciences, University of California San Diego, La Jolla, CA 92093, USA.
Science (New York, N.Y.)
|March 28, 2024
Resumen
La mitosis extendida forma complejos proteicos que desencadenan una respuesta p53, previniendo la proliferación de células hijas problemáticas. Este monitoreo mitótico se pierde en muchos cánceres, lo que sugiere que TP53BP1 y USP28 son supresores de tumores.
Área de la Ciencia:
- Biología celular
- Biología molecular
- La genética
Sus antecedentes:
- La duración mitótica es crítica para la salud celular; la mitosis extendida se correlaciona con la desagregación cromosómica y la inestabilidad genómica.
- Las células problemáticas con mitosis extendida representan riesgos para la integridad genómica.
Objetivo del estudio:
- Investigar los mecanismos moleculares que vinculan la mitosis extendida con los resultados celulares.
- Determinar el papel de la proteína 1 de unión a la p53 (53BP1) y de la proteasa 28 específica de la ubiquitina (USP28) en el seguimiento de la extensión mitótica.
Principales métodos:
- Análisis de la formación de complejos proteicos durante la mitosis extendida.
- Investigación de la participación de la cinasa tipo Polo 1 (PLK1) en el ensamblaje complejo.
- Evaluación de la respuesta p53 en la fase G1 después de la mitosis.
- Evaluación de la proliferación celular en la progenie de las células con mitosis extendida.
- Correlación de la capacidad de monitoreo mitótico con las mutaciones cancerosas y la sensibilidad a los fármacos antimitóticos.
Principales resultados:
- La mitosis extendida desencadena la formación de complejos proteicos 53BP1-USP28-p53.
- Estos complejos se transmiten a las células hijas, induciendo una detención de G1 dependiente de p53.
- Las células que experimentaron una mitosis triple extendida o extensiones sucesivas más cortas mostraron una detención de la proliferación.
- Se observó pérdida de la monitorización de la extensión mitótica en cánceres de tipo p53 mutante y en algunos cánceres de tipo p53 salvaje.
- Los cánceres que mantuvieron el monitoreo mitótico fueron sensibles a los agentes antimitóticos.
Conclusiones:
- La extensión mitótica activa un mecanismo de vigilancia que involucra a 53BP1, USP28 y p53 que previene la proliferación de células aberrantes.
- TP53BP1 y USP28 funcionan como supresores tumorales al permitir el monitoreo mitótico.
- La capacidad de monitorear la extensión mitótica es un biomarcador predictivo de la respuesta al tratamiento antimitótico en el cáncer.
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