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Updated: Jul 18, 2026
21:08
Engineering Cell-permeable Protein
Published on: December 28, 2009
El canal Cl regulado por fosforilación en las células CHO que expresan de forma estable el gen de la fibrosis
J A Tabcharani1, X B Chang, J R Riordan
1Department of Physiology, McGill University, Montreal, Québec, Canada.
Nature
|August 15, 1991
Resumen
El gen de la fibrosis quística expresa un canal de cloruro en las células no epiteliales, activado por la AMP cíclica y regulado por la fosforilación. Este estudio demuestra el control directo de la fosforilación del canal regulador transmembrana de la fibrosis quística.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Fisiología celular Fisiología celular.
- Función del canal iónico Función del canal iónico
Sus antecedentes:
- Se sabe que el producto del gen de la fibrosis quística, el regulador transmembrana de la fibrosis quística (CFTR), regula los canales de cloruro.
- Se ha observado conductividad de cloruro estimulada por AMP cíclico (cAMP) en células epiteliales mediadas por un canal Cl- de baja conductividad.
- La demostración directa del control de fosforilación de este canal en células no epiteliales ha sido insuficiente.
Objetivo del estudio:
- Investigar la regulación directa del canal de cloruro del regulador transmembranar de la fibrosis quística (CFTR) por fosforilación en un sistema de células no epiteliales.
- Caracterizar las propiedades funcionales y los mecanismos reguladores de la conductancia del cloruro mediada por CFTR.
Principales métodos:
- Transfección estable de células de ovario de hámster chino (CHO) con el gen de la fibrosis quística.
- Registros electrofisiológicos para medir la actividad del canal de cloruro.
- Aplicación de análogos de cAMP que atraviesan la membrana y de proteínas quinasas/fosfatasas purificadas para estudiar la regulación de los canales.
Principales resultados:
- La expresión estable del gen de la fibrosis quística en las células CHO dio lugar a la aparición de un canal Cl- ohmico de baja conductividad.
- Esta actividad de canal fue estimulada por análogos de cAMP permeantes de membrana aplicados a la superficie celular (en la célula).
- La actividad del canal fue regulada por las proteínas cinasas A y C (fosforilación) y la fosfatasa alcalina (desfosforilación) cuando se aplicó al lado intracelular de la membrana (fuera de la célula).
Conclusiones:
- El regulador transmembranar de la fibrosis quística funciona como un canal de cloruro regulado directamente por los eventos de fosforilación y desfosforilación.
- Las vías reguladoras de la quinasa convergentes exhiben sinergia en el control de la actividad del canal CFTR.
- Estos hallazgos proporcionan una fuerte evidencia del papel de la CFTR como un canal iónico regulado y resaltan los complejos mecanismos regulatorios.
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