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La segregación de la transferrina a un compartimento para-Golgi ligeramente ácido (pH 6.5) en la vía de reciclaje
Cell
|July 1, 1984
Resumen
Este estudio revela distintas vías intracelulares para la transferrina y la alfa 2-macroglobulina en las células CHO. Un compartimento ligeramente ácido facilita el reciclaje de la transferrina de vuelta a la superficie celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Fisiología molecular y celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Comprender los mecanismos de clasificación intracelular es crucial para la función celular.
- Los ligandos como la transferrina y la alfa 2-macroglobulina siguen destinos diferentes después de la internalización.
- Las células CHO proporcionan un sistema modelo para investigar las vías endocíticas.
Objetivo del estudio:
- Para investigar la clasificación intracelular y el tráfico de transferrina y alfa 2-macroglobulina.
- Para diferenciar los compartimentos celulares involucrados en el reciclaje de ligandos frente a la degradación.
- Para caracterizar las propiedades físico-químicas de estos compartimentos.
Principales métodos:
- Se han utilizado células de ovario de hámster chino (CHO).
- Empleado la fluorescencia y el etiquetado en oro coloidal de la transferrina y la alfa 2-macroglobulina.
- Aplicación de localización ultraestructural y microscopía de fluorescencia con intensificación de imagen.
- Se realizó un análisis de imágenes digitales para determinar el pH del compartimento.
Principales resultados:
- La transferrina y la alfa 2-macroglobulina se segregan rápidamente en compartimentos intracelulares distintos en un plazo de 5 minutos.
- La transferrina se localizó en una estructura juxtanuclear, mientras que la alfa 2-macroglobulina apareció punteada.
- Los estudios ultraestructurales mostraron transferrina en las vesículas / túbulos cerca del Golgi, y alfa 2-macroglobulina en las vesículas endocíticas.
- El compartimento que contiene transferrina tenía un pH de 6.4, distinto de las vesículas endocíticas más ácidas (pH 5.4) que contienen alfa 2-macroglobulina.
Conclusiones:
- Se definió un nuevo compartimento ligeramente ácido involucrado en el reciclaje de componentes internalizados.
- Se demostró que este compartimento es distinto de las vesículas endocíticas.
- Proporcionó información sobre los mecanismos moleculares de la clasificación de ligandos intracelulares y el reciclaje de receptores.
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