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Estabilización del ARNm de la interleucina-2 por la vía de la quinasa c-junio NH2-terminal

C Y Chen¹, F Del Gatto-Konczak, Z Wu

¹Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.

Science (New York, N.Y.)

|June 25, 1998

Resumen

La estabilidad del ARN mensajero (ARNm) de la interleucina-2 (IL-2) en las células T está regulada por múltiples elementos. La vía de la kinasa amino-terminal (JNK) c-Jun controla específicamente la rotación y síntesis del ARNm IL-2.

Área de la Ciencia:

Inmunología Inmunología.
Biología Molecular Biología Molecular
La señalización celular de las células.

Sus antecedentes:

La interleucina-2 (IL-2) es crucial para la proliferación y la función de las células T.
La regulación de la producción de IL-2 implica el control post-transcripcional de su ARN mensajero (ARNm).
Comprender los mecanismos de estabilización del ARNm es clave para controlar las respuestas inmunes.

Objetivo del estudio:

Para investigar las vías de señalización que estabilizan el ARNm IL-2 en las células T activadas.
Para identificar elementos cis específicos dentro del ARNm IL-2 involucrados en la estabilización.
Para aclarar el papel de la vía c-Jun amino-terminal quinasa (JNK) en la regulación del ARNm IL-2.

Principales métodos:

Análisis de la estabilidad del ARNm IL-2 en las células T activadas.
Identificación y caracterización de elementos de acción cis en las regiones 5' y 3' no traducidas (UTR) del ARNm IL-2.
Examen de los efectos de la activación de la vía JNK en los niveles de ARNm IL-2.

Principales resultados:

El ARNm IL-2 posee al menos dos elementos cis distintos que median en la estabilización.
Un elemento 5' cis, incluyendo la región 5' no traducida (UTR) y el inicio de la región codificante, es crítico para la estabilización mediada por JNK.
Las transcripciones de IL-2 que carecen del elemento 5' siguen respondiendo a otras señales de activación de células T a través de la 3' UTR.
La vía del JNK influye tanto en la rotación como en la síntesis del ARNm IL-2.

Conclusiones:

Múltiples elementos cis dentro del ARNm IL-2 cooperan para regular su estabilidad.
La vía de señalización JNK juega un papel importante en el control de la estabilidad y la producción de ARNm IL-2.
La regulación combinatoria del ARNm IL-2 por diferentes elementos y vías de señalización ajusta las respuestas inmunes.

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