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La supresión de IKK beta de TSC1 vincula la inflamación y la angiogénesis tumoral a través de la vía mTOR
Dung-Fang Lee1, Hsu-Ping Kuo, Chun-Te Chen
1Department of Molecular and Cellular Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA.
Cell
|August 19, 2007
Resumen
El factor de necrosis tumoral alfa (TNFalpha) vincula la inflamación con el cáncer. Este estudio revela que IKKbeta fosforila el TSC1, activa el mTOR, promueve el crecimiento tumoral y la angiogénesis, ofreciendo un objetivo potencial de intervención contra el cáncer.
Área de la Ciencia:
- Oncología Oncología.
- Biología Molecular Biología Molecular
- Inmunología Inmunología.
Sus antecedentes:
- El factor de necrosis tumoral alfa (TNFalpha) está implicado en la patogénesis del cáncer.
- El complejo TSC1/TSC2 suprime la vía mTOR, y su disfunción contribuye a la tumorigénesis.
Objetivo del estudio:
- Para dilucidar los mecanismos moleculares que vinculan la señalización de TNFalpha al desarrollo del cáncer.
- Investigar el papel de IKKbeta en la regulación del complejo TSC1/TSC2 y la activación de la vía mTOR.
Principales métodos:
- Coinmunoprecipitación para evaluar las interacciones de las proteínas.
- Ensayos de kinasa in vitro para determinar los sitios de fosforilación.
- Análisis de muestras de tumores para la expresión de proteínas y la fosforilación.
- Correlación de marcadores moleculares con los resultados clínicos en pacientes con cáncer de mama.
Principales resultados:
- IKKbeta interactúa directamente con y fosforila el TSC1 en Ser487 y Ser511.
- La supresión de TSC1 mediada por IKKbeta conduce a la activación de la vía mTOR, la angiogénesis mejorada y el desarrollo de tumores.
- La IKKbeta activada, la fosforilación de TSC1 y la expresión de VEGF se correlacionan con malos resultados en el cáncer de mama.
Conclusiones:
- Se identifica una nueva vía que involucra a IKKbeta, TSC1 y mTOR en la tumorigénesis inducida por la inflamación.
- Esta vía es crítica para la angiogénesis tumoral y representa un objetivo terapéutico potencial para la intervención contra el cáncer.
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