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El adaptador de ligasa AMBRA1 E3 regula la estabilidad de la ciclina D
Andrea C Chaikovsky1,2, Chuan Li3, Edwin E Jeng2
1Department of Pediatrics, Stanford University, Stanford, CA, USA.
Nature
|April 15, 2021
Resumen
El regulador de autofagia y beclina 1 (AMBRA1) controla los niveles de ciclina D marcando su degradación. La pérdida de AMBRA1 aumenta la ciclina D, promoviendo el crecimiento del cáncer y reduciendo la sensibilidad a los inhibidores de la CDK4/ 6.
Área de la Ciencia:
- Biología celular
- Biología molecular
- En el campo de la oncología
Sus antecedentes:
- El inicio de la división celular integra las entradas celulares, con las ciclinas de tipo D (ciclina D) que las vinculan a la replicación del ADN.
- El aumento de la actividad de la ciclina D-CDK4/ 6 está relacionado con el cáncer debido a la proliferación celular no controlada.
- Los mecanismos que regulan los niveles de ciclina D aún no se comprenden por completo.
Objetivo del estudio:
- Identificar los reguladores clave de la degradación de la ciclina D.
- Investigar el papel de AMBRA1 en el control del ciclo celular y el cáncer.
- Comprender el impacto de AMBRA1 en la respuesta al inhibidor de CDK4/ 6.
Principales métodos:
- Examen genético de todo el genoma para identificar los reguladores de la respuesta de inhibición de CDK4/6.
- Modelos celulares y de ratón para evaluar los efectos de la pérdida de AMBRA1.
- Ensayos bioquímicos para elucidar el mecanismo de degradación de la ciclina D.
Principales resultados:
- AMBRA1 fue identificado como el regulador primario de la degradación de la ciclina D.
- La pérdida de AMBRA1 conduce a niveles elevados de ciclina D, promoviendo la proliferación y reduciendo la sensibilidad a la inhibición de la CDK4/ 6.
- AMBRA1 actúa como receptor de sustrato para el complejo de la ligasa CUL4 E3, mediando la ubicuidad de la ciclina D y la degradación proteasómica.
Conclusiones:
- AMBRA1 es un regulador crítico de los niveles celulares de ciclina D.
- La pérdida de AMBRA1 aumenta el crecimiento del adenocarcinoma pulmonar en ratones.
- Los niveles bajos de AMBRA1 se correlacionan con una menor supervivencia en pacientes con adenocarcinoma pulmonar, lo que sugiere un papel en el desarrollo del cáncer y la respuesta terapéutica.
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