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Una función de la ciclina D1 en la reparación del ADN descubierta por los análisis del interactoma de proteínas en

Siwanon Jirawatnotai¹, Yiduo Hu, Wojciech Michowski

¹Department of Cancer Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02215, USA.

|June 10, 2011

Resumen

La ciclina D1, una proteína del ciclo celular, ayuda inesperadamente a la reparación del ADN al unirse a RAD51 en los sitios dañados. La inhibición de la ciclina D1 puede tratar los cánceres retinoblastoma-negativos, ampliando su potencial terapéutico.

Área de la Ciencia:

Biología Molecular Biología Molecular
Investigación del cáncer Investigación del cáncer.
Mecanismos de reparación del ADN.

Sus antecedentes:

La ciclina D1 es un regulador clave del ciclo celular que con frecuencia se sobreexpresa en los cánceres humanos.
Su papel preciso en el cáncer más allá de la progresión del ciclo celular sigue siendo incompletamente entendido.

Objetivo del estudio:

Identificar nuevas funciones moleculares de la ciclina D1 en el cáncer humano.
Para investigar la interacción entre la ciclina D1 y las vías de reparación del ADN.

Principales métodos:

Cribado proteómico para identificar las proteínas que interactúan con la ciclina D1 en tumores humanos.
Co-inmunoprecipitación e inmunofluorescencia para estudiar las interacciones y localización de las proteínas.
Evaluación de la capacidad de reparación del ADN y la sensibilidad celular a la radiación tras el agotamiento de la ciclina D1.

Principales resultados:

El análisis proteómico reveló que la ciclina D1 interactúa con las proteínas de reparación del ADN, en particular RAD51.1.
La ciclina D1 se une directamente a RAD51, y esta interacción es inducida por la radiación y depende del BRCA2.
El agotamiento de la ciclina D1 afecta el reclutamiento de RAD51 a los sitios de daño del ADN, dificulta la reparación de la recombinación homóloga y aumenta la radiosensibilidad, incluso en las células cancerosas negativas de retinoblastoma.

Conclusiones:

La ciclina D1 posee una función no reconocida previamente en la reparación del ADN mediada por recombinación homóloga.
Dirigirse a la ciclina D1 puede ofrecer beneficios terapéuticos para los cánceres negativos de retinoblastoma, un grupo que generalmente no se considera sensible a la inhibición de la ciclina D1.

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