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Malachite Green Assay for the Discovery of Heat-Shock Protein 90 Inhibitors
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Desarrollo de un inhibidor Hsp90 dirigido a las mitocondrias basado en las estructuras cristalinas del TRAP1 humano
Changwook Lee, Hye-Kyung Park, Hanbin Jeong
1∥New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, 701-310, Korea.
Journal of the American Chemical Society
|March 19, 2015
Resumen
Los investigadores desarrollaron un nuevo inhibidor mitocondrial de TRAP1, SMTIN-P01, para atacar las células cancerosas de manera más efectiva. Este nuevo fármaco muestra una mejor citotoxicidad en comparación con los inhibidores Hsp90 existentes al acumularse específicamente en las mitocondrias.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Investigación de Investigación del Cáncer.
Sus antecedentes:
- La proteína de choque térmico 90 (Hsp90) y su parálogo TRAP1 están implicados en la supervivencia y el metabolismo de las células cancerosas.
- Los inhibidores de Hsp90 se exploran para la terapia del cáncer, pero sus objetivos mitocondriales siguen sin estar claros.
- El papel de TRAP1 en el cáncer lo sugiere como un potencial objetivo terapéutico.
Objetivo del estudio:
- Para identificar el objetivo mitocondrial específico de los inhibidores de Hsp90 en las células cancerosas.
- Desarrollar nuevos inhibidores que ataquen eficazmente el TRAP1.1 mitocondrial.
- Para aclarar el mecanismo de la hidrólisis de ATP TRAP1 y su papel en la función de chaperón.
Principales métodos:
- Estructuras cristalinas determinadas de TRAP1 humano complejo con inhibidores de Hsp90.
- Sintetizó un nuevo inhibidor de TRAP1 dirigido a las mitocondrias, SMTIN-P01, mediante la modificación de PU-H71.1.
- Evaluó la citotoxicidad y el modo de acción de SMTIN-P01 en células cancerosas.
- Se determinó la estructura de un complejo de TRAP1-adenilil-imidodifosfato (AMP-PNP).
Principales resultados:
- Identificó TRAP1 como el objetivo mitocondrial primario, no inhibido efectivamente por los inhibidores actuales de Hsp90 debido a una mala acumulación mitocondrial.
- SMTIN-P01 demostró una mayor acumulación en las mitocondrias y una citotoxicidad significativamente mejorada en comparación con PU-H71.1.
- Se reveló un modo de acción distinto para SMTIN-P01.
- Propuso un mecanismo molecular para la hidrólisis de ATP en TRAP1 basado en el análisis estructural.
Conclusiones:
- TRAP1 es el objetivo mitocondrial clave para la terapia del cáncer, que requiere inhibidores específicos.
- SMTIN-P01 representa una nueva estrategia prometedora para atacar el TRAP1 mitocondrial en el cáncer.
- Comprender el mecanismo de hidrólisis de ATP de TRAP1 es crucial para desarrollar agentes anticancerígenos efectivos.
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