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La autofagia suprime la tumorigénesis a través de la eliminación de p62
Robin Mathew1, Cristina M Karp, Brian Beaudoin
1University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA.
Cell
|June 16, 2009
Resumen
Los defectos de la autofagia en las células cancerosas conducen a la acumulación de p62/SQSTM1 (p62), causando estrés oxidativo y promoviendo el crecimiento tumoral. La restauración de la regulación p62 es crucial para comprender el desarrollo del cáncer y las posibles terapias.
Área de la Ciencia:
- Biología celular Biología celular.
- Oncología Oncología.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La autofagia es un proceso celular involucrado en la degradación de componentes dañados.
- La pérdida del gen de la autofagia beclin1 está relacionada con el desarrollo del cáncer.
- Las células tumorales usan la autofagia para sobrevivir al estrés, pero los defectos pueden, paradójicamente, promover el cáncer.
Objetivo del estudio:
- Para investigar el papel de los defectos de la autofagia en la progresión tumoral.
- Para entender cómo la deficiencia de autofagia conduce a la acumulación de proteínas específicas y daño celular.
- Para explorar el vínculo entre la acumulación de p62/SQSTM1 y la tumorigénesis.
Principales métodos:
- Análisis de las células tumorales con defecto de autofagia.
- Evaluación de los componentes celulares acumulados, incluidos p62/SQSTM1, chaperones ER, mitocondrias dañadas y especies reactivas del oxígeno (ROS).
- Investigando el impacto de la supresión de ROS y p62 en el daño inducido por un defecto de autofagia.
Principales resultados:
- Las células tumorales con defecto de autofagia acumulan p62/SQSTM1, chaperones ER, mitocondrias dañadas, ROS, y muestran daño en el genoma.
- La supresión de ROS o p62 evitó el daño causado por defectos de la autofagia, lo que indica que la desregulación de p62 impulsa el estrés oxidativo.
- La expresión sostenida de p62 alteró la señalización de NF-kappaB y la expresión génica, promoviendo la tumorigénesis.
Conclusiones:
- La autofagia defectuosa conduce a la regulación p62/SQSTM1 en los tumores, lo que contribuye a la progresión del cáncer.
- La acumulación de p62/SQSTM1 debido a defectos de la autofagia perturba las vías críticas de señalización, impulsando la oncogénesis.
- Dirigir la regulación p62 puede ofrecer estrategias terapéuticas para los cánceres con defectos de autofagia.
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