DDX5 y su asociado lncRNA Rmrp modulan las funciones efectoras de las células TH17
Wendy Huang1, Benjamin Thomas2, Ryan A Flynn3
1The Kimmel Center for Biology and Medicine of the Skirball Institute, New York University School of Medicine, New York, New York 10016, USA.
Nature
|December 18, 2015
Resumen
La proteína DEAD-box 5 (DDX5), una helicasa de ARN, se asocia con RORγt para regular la diferenciación de las células T ayudantes 17 (TH17). Esta interacción, dependiente del ARN no codificante largo de Rmrp, es crucial para la inflamación mediada por TH17.
Área de la Ciencia:
- Inmunología
- Biología molecular
- La genética
Sus antecedentes:
- Las células T ayudantes 17 (TH17) son vitales para la inmunidad de la mucosa, pero están implicadas en enfermedades inflamatorias crónicas.
- La diferenciación celular TH17 está regulada por el receptor nuclear RORγt.
Objetivo del estudio:
- Identificar nuevos socios de RORγt involucrados en la función de las células TH17.
- Aclarar el papel de las helicasas de ARN y los ARN largos no codificantes en las patologías mediadas por TH17.
Principales métodos:
- Co-inmunoprecipitación para identificar las interacciones con las proteínas.
- Pruebas de unión al ARN para evaluar la participación del lncRNA.
- Análisis de la expresión génica para cuantificar la transcripción del gen objetivo.
- Modelos de ratón con mutaciones genéticas dirigidas.
Principales resultados:
- La proteína DEAD-box 5 (DDX5) fue identificada como un socio que interactúa con RORγt.
- La interacción de DDX5 con RORγt y la coactivación transcripcional dependen de su actividad de la RNA helicasa y del Rmrp lncRNA.
- Un modelo de ratón que imitaba la mutación de hipoplasia de cartílago-pelo en Rmrp mostró una interacción alterada de DDX5-RORγt y una reducción de la transcripción del gen TH17.
Conclusiones:
- DDX5 y Rmrp son componentes esenciales del complejo transcripcional RORγt que regula la diferenciación celular TH17.
- Los hallazgos revelan un nuevo mecanismo que involucra a las RNA helicasas y los lncRNA en la regulación génica específica del tejido.
- Este estudio ofrece objetivos terapéuticos potenciales para las enfermedades inflamatorias dependientes de TH17.
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