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Rescate del tráfico de ΔF508-CFTR a través de una vía de secreción no convencional dependiente del GRASP
Heon Yung Gee1, Shin Hye Noh, Bor Luen Tang
1Department of Pharmacology, Brain Korea 21 Project for Medical Sciences, Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul 120-752, Korea.
Cell
|September 3, 2011
Resumen
La expresión superficial de la mutación de fibrosis quística ΔF508-CFTR se restaura a través de una vía no convencional dependiente de GRASP. Este enfoque rescata la función CFTR y la supervivencia en ratones, ofreciendo una potencial estrategia terapéutica.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Fisiología Fisiología Fisiología.
Sus antecedentes:
- La mutación primaria en la fibrosis quística, la deleción Phe508 (ΔF508), afecta el tráfico de proteínas CFTR y la expresión en la superficie celular.
- Las vías convencionales de secreción de proteínas no logran transportar correctamente el ΔF508-CFTR a la superficie celular.
Objetivo del estudio:
- Para investigar una vía de secreción no convencional para rescatar la expresión superficial ΔF508-CFTR.
- Explorar el papel de la secreción dependiente de GRASP en la corrección de la disfunción del CFTR.
Principales métodos:
- Utilizó análisis moleculares y fisiológicos para estudiar el tráfico de CFTR.
- Se han investigado las vías de ER inducidas por el estrés y la secreción mediada por GRASP.
- Examinó la fosforilación y las interacciones de proteínas críticas para el tráfico.
- Se generaron ratones transgénicos ΔF508-CFTR que expresan GRASP.
Principales resultados:
- La expresión superficial ΔF508-CFTR fue rescatada in vitro e in vivo a través de una vía dependiente de GRASP.
- Los mecanismos de estrés de ER promueven el tráfico de tipo silvestre y ΔF508-CFTR a través de esta ruta no convencional.
- La fosforilación de GRASP y su interacción basada en PDZ con CFTR son esenciales para este rescate.
- La expresión transgénica de GRASP en ratones restauró la función CFTR y mejoró la supervivencia sin toxicidad.
Conclusiones:
- La secreción no convencional dependiente de GRASP ofrece una estrategia viable para corregir los defectos de ΔF508-CFTR.
- Esta vía proporciona información sobre el tráfico de proteínas mediado por el estrés ER.
- Dirigirse a GRASP representa una vía terapéutica potencial para la fibrosis quística y otras enfermedades de plegamiento incorrecto de proteínas.
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