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Updated: May 21, 2026
14:32
Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates
Published on: February 27, 2016
SIRT7 vincula la desacetilación de H3K18 con el mantenimiento de la transformación oncogénica
Matthew F Barber1, Eriko Michishita-Kioi, Yuanxin Xi
1Department of Biology, Stanford University, Stanford, California 94305, USA.
Nature
|June 23, 2012
Resumen
SIRT7, una histona desacetilasa, estabiliza las células cancerosas mediante la desacetilación de H3K18Ac. El agotamiento de SIRT7 reduce el crecimiento tumoral, destacando su papel en la progresión del cáncer y su potencial como objetivo terapéutico.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La epigenética es la epigenética.
- Investigación del cáncer Investigación del cáncer.
Sus antecedentes:
- Las sirtuinas son proteínas que regulan las vías celulares, el metabolismo y el envejecimiento.
- Las funciones específicas y los objetivos de la sirtuina 7 de mamíferos (SIRT7) no estaban claros anteriormente.
- La acetilación de histonas, particularmente H3K18Ac, está relacionada con la transformación celular y el pronóstico del cáncer.
Objetivo del estudio:
- Para aclarar la actividad bioquímica y las funciones fisiológicas de SIRT7.
- Determinar el papel de SIRT7 en la estabilización del estado transformado de las células cancerosas.
- Para investigar el impacto de SIRT7 en la regulación de la cromatina y la formación de tumores.
Principales métodos:
- Pruebas bioquímicas para identificar la actividad enzimática de SIRT7 como una deacetilasa H3K18Ac dependiente de NAD ((+) dependiente.
- Estudios de unión de todo el genoma para mapear los promotores de genes diana de SIRT7.
- Experimentos relacionados con el agotamiento de SIRT7 en células cancerosas humanas y xenografts de ratón.
Principales resultados:
- SIRT7 desacetila H3K18Ac en promotores de genes específicos, lo que lleva a la represión de la transcripción.
- La interacción de SIRT7 con ELK4 influye en su espectro de genes diana, incluidos los genes supresores de tumores.
- SIRT7 es esencial para las características de las células cancerosas como el crecimiento independiente del anclaje y la evasión de la inhibición del contacto, y reduce el crecimiento del xenogénito tumoral tras el agotamiento.
Conclusiones:
- SIRT7 es una desacetilasa H3K18Ac altamente selectiva crucial para mantener la transformación de las células cancerosas.
- SIRT7 juega un papel fundamental en la regulación de la cromatina y en los programas de transformación celular.
- SIRT7 es esencial para la formación de tumores in vivo, lo que sugiere su potencial como objetivo terapéutico.
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