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La activación dependiente de 5'-trifosfato de la PKR por ARN con bucles de tallo cortos

Subba Rao Nallagatla¹, Jungwook Hwang, Rebecca Toroney

¹Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.

Science (New York, N.Y.)

|December 1, 2007

Resumen

Los ARN patógenos activan el sistema inmunológico.

Área de la Ciencia:

La inmunidad innata es la inmunidad innata.
Detección de ARN por detección de ARN.
Biología molecular La biología molecular.

Sus antecedentes:

El sistema inmune innato reconoce patrones moleculares en ARN patógenos.
La proteína quinasa activada por ARN (PKR) es una enzima inducida por el interferón involucrada en esta respuesta.
Anteriormente se pensaba que los ARN largos de doble cadena eran los principales activadores de la PKR.

Objetivo del estudio:

Para investigar el papel de la estructura secundaria de ARN y las modificaciones 5' en la activación de PKR.
Para determinar si la PKR puede distinguir entre el ARN patógeno y el propio ARN.
Para dilucidar el mecanismo de activación de PKR por el ARN 5'-trifosfato.

Principales métodos:

Se llevaron a cabo experimentos in vitro e in vivo.
Los ensayos de activación de PKR se realizaron utilizando varias construcciones de ARN.
Se evaluó el papel de RIG-I y el interferón tipo 1 (IFN-alfa) en la activación de PKR.

Principales resultados:

Los ARN con estructuras secundarias limitadas activan la PKR de una manera dependiente del 5'-trifosfato.
La activación de PKR por el ARN 5'-trifosfato es independiente de RIG-I.
El interferón tipo 1 (IFN-alfa) mejora la activación de PKR por el ARN 5'-trifosfato.

Conclusiones:

La vigilancia PKR de las características del ARN 5' permite la discriminación entre el ARN patógeno y el propio.
La activación del ARN 5'-trifosfato de PKR es un paso crítico en las primeras respuestas inmunes.
Este mecanismo contribuye a la capacidad del sistema inmune innato para detectar el ARN viral.

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