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Cyld inhibe la proliferación de las células tumorales al bloquear la señalización NF-kappaB dependiente de Bcl-3 y
Ramin Massoumi1, Katarzyna Chmielarska, Katharina Hennecke
1Department of Molecular Medicine, Max Planck Institute of Biochemistry, D-82152 Martinsried, Germany.
Cell
|May 23, 2006
Resumen
El gen deubiquitinasa CYLD regula el crecimiento de tumores de la piel mediante el control de diferentes vías de NF-kappaB. La pérdida de CYLD aumenta la susceptibilidad a los tumores de piel inducidos químicamente al afectar la proliferación celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Oncología Oncología.
- Dermatología Dermatología dermatología.
Sus antecedentes:
- Las mutaciones en el gen CYLD están vinculadas a los tumores de queratinocitos del folículo piloso.
- El gen CYLD codifica una enzima deubiquitinasa involucrada en la regulación de las vías de señalización celular.
- La actividad de la deubiquitinasa CYLD se dirige a las cadenas de ubiquitina ligadas a la lisina 63 en TRAF2, inhibiendo la activación del factor nuclear-kappaB (NF-kappaB) p65/p50.
Objetivo del estudio:
- Para investigar el papel del gen CYLD en la tumorigénesis de la piel inducida químicamente.
- Para aclarar las vías específicas de NF-kappaB reguladas por CYLD en los queratinocitos.
- Comprender cómo la inactivación de CYLD contribuye al desarrollo y la proliferación de tumores de la piel.
Principales métodos:
- Utilizó ratones Cyld knockout (Cyld-/-) para evaluar la susceptibilidad a los tumores de piel inducidos químicamente.
- Los tumores Cyld-/- analizados y los queratinocitos tratados con acetato de 12-O-tetradecanoilforbol-13 (TPA) o luz UV para la hiperproliferación y los niveles de ciclina D1.
- Investigó la translocación nuclear y la actividad de desubiquitinación de CYLD en relación con los componentes Bcl-3 y NF-kappaB (p50, p52).
Principales resultados:
- Los ratones que carecían de Cyld (Cyld-/-) exhibieron una alta susceptibilidad a los tumores de piel inducidos químicamente.
- Los tumores Cyld-/- y los queratinocitos tratados mostraron hiperproliferación y niveles elevados de ciclina D1.
- La inactivación de CYLD condujo a un aumento de la actividad nuclear de NF-kappaB p50 y p52 asociados con Bcl-3, impulsando la proliferación, en lugar de afectar la acción de p65/p50.
Conclusiones:
- CYLD regula negativamente distintas vías NF-kappaB basadas en señales externas.
- La inactivación de TRAF2 por CYLD influye en la supervivencia y la inflamación.
- La inhibición de Bcl-3 por CYLD controla la proliferación celular y el crecimiento tumoral, destacando el papel crítico de CYLD en la prevención de la tumorigénesis de la piel.
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