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La elevación sistémica de PTEN induce un estado metabólico supresor del tumor
Isabel Garcia-Cao1, Min Sup Song, Robin M Hobbs
1Cancer Genetics Program, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
Cell
|March 10, 2012
Resumen
El aumento de los niveles de PTEN (fosfatasa y homólogo de la tensina) en ratones reduce el riesgo de cáncer y promueve un metabolismo saludable. Este hallazgo sugiere la elevación de PTEN como una estrategia potencial para la prevención y terapia del cáncer.
Área de la Ciencia:
- Oncología Oncología.
- La investigación en el metabolismo.
- Genética La genética.
Sus antecedentes:
- La pérdida de la función de PTEN (fosfatasa y homólogo de la tensina) está relacionada con el desarrollo y la progresión del cáncer.
- Restaurar o aumentar los niveles de PTEN podría ofrecer un nuevo enfoque para la prevención y el tratamiento del cáncer.
Objetivo del estudio:
- Investigar los efectos de la expresión elevada de PTEN en la salud del organismo, el metabolismo y la resistencia al cáncer.
- Explorar los mecanismos subyacentes por los cuales el PTEN influye en el metabolismo celular y la transformación oncogénica.
Principales métodos:
- Líneas de ratón transgénico generadas con diferentes niveles de expresión de PTEN utilizando transgénesis mediada por cromosomas artificiales bacterianos (BAC).
- Parámetros fisiológicos analizados que incluyen el tamaño corporal, el metabolismo, el gasto energético y la acumulación de grasa corporal.
- Perfiles metabólicos celulares evaluados, incluida la absorción de glucosa y glutamina, actividad mitocondrial y resistencia a la transformación oncogénica.
- Investigó el papel de las vías dependientes e independientes de PI3K en la mediación de los efectos metabólicos de PTEN.
Principales resultados:
- Los ratones "Super-PTEN" viables exhibieron un tamaño corporal reducido debido a la disminución del número de células, pero mantuvieron un tamaño celular normal.
- El aumento de PTEN condujo a un perfil metabólico más saludable con un mayor gasto energético y una reducción de la grasa corporal.
- Las células elevadas en PTEN demostraron una reducción de la absorción de glucosa y glutamina, una mayor fosforilación oxidativa mitocondrial y resistencia a la transformación oncogénica.
- La elevación de PTEN suprimió la glutaminólisis y el efecto Warburg, las principales alteraciones metabólicas en las células tumorales.
Conclusiones:
- La elevación de PTEN a nivel del organismo confiere resistencia a la transformación oncogénica y promueve un estado metabólicamente saludable.
- PTEN regula un interruptor metabólico que afecta el metabolismo de la glucosa y la glutamina, potencialmente a través de vías dependientes y independientes de PI3K.
- Estos hallazgos destacan el PTEN como un objetivo prometedor para la prevención y la terapia del cáncer mediante la modulación del metabolismo celular.
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