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La variante de histona macroH2A suprime la progresión del melanoma a través de la regulación de la CDK8
Avnish Kapoor1, Matthew S Goldberg, Lara K Cumberland
1Department of Oncological Sciences, Mount Sinai School of Medicine, 1425 Madison Avenue, New York, New York 10029, USA.
Nature
|December 24, 2010
Resumen
La variante de histona macroH2A (mH2A) suprime la progresión del melanoma maligno. La pérdida de mH2A se correlaciona con un aumento de la malignidad, la proliferación y la metástasis del melanoma mediante la regulación al alza de la CDK8.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología del cáncer Biología del cáncer.
- Biología de la cromatina Biología de la cromatina
Sus antecedentes:
- El cáncer implica alteraciones genéticas y epigenéticas, incluidos cambios en la cromatina.
- El papel de las variantes de histona en la iniciación y progresión del cáncer no se entiende completamente.
- Las variantes de histona, como macroH2A (mH2A), alteran la función del nucleosoma y las propiedades de la cromatina.
Objetivo del estudio:
- Para investigar el papel de la variante de histona macroH2A (mH2A) en la progresión del melanoma maligno.
- Para determinar la correlación entre la expresión de mH2A y la malignidad del melanoma.
- Para dilucidar los mecanismos moleculares por los cuales mH2A influye en el desarrollo del melanoma.
Principales métodos:
- Analizando la expresión de la isoforma mH2A en líneas celulares de melanoma y tejidos de pacientes.
- Realización de experimentos de eliminación y restauración de mH2A en células de melanoma.
- Investigar el efecto de mH2A en la proliferación celular, la migración, el crecimiento y la metástasis in vitro e in vivo.
- Evaluación del papel de la CDK8 en la progresión del melanoma mediado por mH2A.
Principales resultados:
- La pérdida de las isoformas de mH2A se correlaciona positivamente con el aumento de la malignidad de las células del melanoma.
- La reducción de mH2A en las células de melanoma de baja malignidad aumentó la proliferación, la migración, el crecimiento y la metástasis.
- La restauración de la expresión de mH2A invirtió estos fenotipos malignos.
- La pérdida de mH2A promueve la progresión tumoral en parte a través de la regulación al alza transcripcional de CDK8.
- La supresión de CDK8 inhibió la proliferación de células de melanoma, y el bloqueo de CDK8 contrarrestó la ventaja proliferativa de la pérdida de mH2A.
- Se observó una correlación inversa significativa entre la expresión de mH2A y CDK8 en muestras de pacientes con melanoma.
Conclusiones:
- MacroH2A (mH2A) actúa como un supresor de la progresión del melanoma maligno.
- La pérdida de mH2A contribuye al desarrollo del melanoma y la metástasis a través de la regulación de la CDK8.
- mH2A es un componente crítico de la cromatina que inhibe la progresión del melanoma maligno.
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