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Updated: May 6, 2026
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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
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Un programa de linaje de melanocitos confiere resistencia a la inhibición de la vía de la MAP quinasa
Cory M Johannessen1, Laura A Johnson, Federica Piccioni
11] The Broad Institute of Harvard University and Massachusetts Institute of Technology, 7 Cambridge Center, Cambridge, Massachusetts 02142, USA [2] Department of Medical Oncology, Dana-Farber Cancer Institute, 44 Binney Street, Boston, Massachusetts 02115, USA [3] Harvard Medical School, 25 Shattuck Street, Boston, Massachusetts 02115, USA.
Nature
|November 5, 2013
Resumen
BRAF ((V600E) el melanoma se basa en la señalización RAF-MEK-ERK. Los investigadores identificaron una vía dependiente de la cAMP que involucra a CREB que impulsa la resistencia a las terapias dirigidas, sugiriendo tratamientos combinados para mejorar la eficacia.
Área de la Ciencia:
- Oncología Oncología.
- Biología Molecular Biología Molecular
- Farmacología Farmacología.
Sus antecedentes:
- Los melanomas malignos con mutaciones BRAF (V600E) dependen de la señalización RAF-MEK-ERK.
- Los inhibidores de RAF y MEK son efectivos, pero se enfrentan a desafíos de resistencia.
Objetivo del estudio:
- Caracterizar globalmente los mecanismos de resistencia en el melanoma BRAF (V600E).
- Identificar nuevas dianas terapéuticas y combinaciones para superar la resistencia a los medicamentos.
Principales métodos:
- Estudios sistemáticos de resistencia a la ganancia de función que involucran la expresión de más de 15.500 genes.
- Tratamiento de una línea celular de melanoma BRAF ((V600E) con inhibidores RAF, MEK, ERK o combinados RAF-MEK.
- Análisis de biopsias de pacientes para evaluar la actividad de CREB en tumores recidivantes.
Principales resultados:
- Una red de señalización melanocítica dependiente de la AMP cíclica, incluido el CREB, fue identificada como un impulsor de la resistencia.
- El CREB fosforilado fue suprimido por la inhibición de RAF-MEK, pero restaurado en tumores recurrentes.
- Los factores de transcripción como c-FOS, NR4A1, NR4A2 y MITF también confirieron resistencia.
Conclusiones:
- La desregulación oncogénica de las dependencias del linaje de melanocitos puede causar resistencia a los inhibidores de RAF-MEK-ERK.
- La combinación de inhibidores de la vía MAPK con inhibidores de la histona desacetilasa puede superar la resistencia mediada por MITF y CAMP.
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