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Un factor específico de unión al ARNm regula la estabilidad dependiente del hierro del ARNm del receptor
E W Müllner1, B Neupert, L C Kühn
1Swiss Institute for Experimental Cancer Research Genetics Unit, Epalinges, Switzerland.
Cell
|July 28, 1989
Resumen
La homeostasis celular del hierro se mantiene por un factor común que regula tanto la estabilidad del ARNm del receptor de transferrina (hTR) como la traducción de la ferritina. Este factor es el factor.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Regulación genética Reglamento genético.
- Metabolismo del hierro.
Sus antecedentes:
- El hierro es esencial para la función celular y sus niveles están estrictamente regulados.
- La expresión del receptor de transferrina humana (hTR) está modulada por la disponibilidad de hierro.
- La regulación post-transcripcional juega un papel clave en el control de la expresión génica.
Objetivo del estudio:
- Para identificar el mecanismo regulador de la estabilidad del ARNm hTR dependiente del hierro.
- Para caracterizar el factor citoplasmático involucrado en la regulación del ARNm hTR.
- Para investigar la relación entre la hTR y la regulación del ARNm de la ferritina por el hierro.
Principales métodos:
- Ensayos de unión al ARN para identificar y caracterizar el factor citoplasmático.
- Análisis de la estabilidad del ARNm bajo diferentes condiciones de hierro.
- Ensayos de competencia utilizando secuencias reguladoras de ARNm de ferritina.
Principales resultados:
- Un factor citoplasmático específico se une a palíndromos homólogos en la región no traducida 3' del ARNm hTR.
- La quelación del hierro aumenta la actividad de unión del factor y los niveles de ARNm hTR.
- La adición de hierro disminuye rápidamente la actividad del factor, antes de la degradación del ARNm hTR.
- La unión del factor está en competencia con las secuencias reguladoras del ARNm de ferritina.
Conclusiones:
- Un factor citoplasmático común coordina la regulación dependiente del hierro de la expresión de hTR y ferritina.
- Este factor media el control post-transcripcional de la estabilidad del ARNm hTR.
- La homeostasis celular del hierro se mantiene a través de la regulación coordinada de la absorción de hierro (hTR) y el almacenamiento / utilización (ferritina).
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