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Septins
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El inflamatorio Nlrp9b restringe la infección por rotavirus en las células epiteliales intestinales
Shu Zhu1, Siyuan Ding2,3, Penghua Wang4
1Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
Nature
|June 22, 2017
Resumen
Los investigadores descubrieron Nlrp9b, una proteína en las células intestinales, que combate el rotavirus. Esta proteína desencadena la muerte celular para restringir la propagación viral, ofreciendo nuevos objetivos para las terapias antivirales.
Área de la Ciencia:
- Inmunología
- Virología
- Gastroenterología
Sus antecedentes:
- El rotavirus causa diarrea severa en los niños, lo que lleva a una mortalidad significativa.
- Los mecanismos de detección y restricción de los virus entéricos por la inmunidad innata del huésped, particularmente los inflamatorios del receptor NOD (NLR), siguen siendo poco conocidos.
- El papel de las células epiteliales intestinales en las respuestas antivirales contra el rotavirus requiere más investigación.
Objetivo del estudio:
- Identificar y caracterizar los nuevos factores del huésped implicados en la restricción de la infección por rotavirus en la mucosa intestinal.
- Aclarar el mecanismo por el cual el NLR Nlrp9b restringe la replicación del rotavirus en las células epiteliales intestinales.
- Investigar el papel de la activación inflamatoria mediada por Nlrp9b en la defensa del huésped contra el rotavirus in vivo.
Principales métodos:
- Caracterización de la expresión y función de Nlrp9b en las células epiteliales intestinales.
- Investigación de la formación del complejo inflamatorio Nlrp9b con Asc y caspase-1.
- Evaluación de la replicación del rotavirus y la susceptibilidad del huésped en ratones con deficiencia de Nlrp9b y en modelos in vivo con componentes inflamatorios agotados.
Principales resultados:
- Nlrp9b reconoce específicamente el ARN corto de doble cadena (dsRNA) del rotavirus a través de la RNA helicasa Dhx9.
- Nlrp9b forma complejos inflamatorios, activando la caspasa-1 para la maduración de IL-18 y la piroptosis inducida por Gsdmd.
- El agotamiento de Nlrp9b o de los componentes inflamatorios en ratones aumenta la susceptibilidad a la infección por rotavirus.
Conclusiones:
- Nlrp9b actúa como un sensor crítico y efector de la inmunidad innata en las células epiteliales intestinales contra el rotavirus.
- La vía del inflamatorio Nlrp9b restringe la replicación del rotavirus a través de la piroptosis.
- Esta vía representa un objetivo terapéutico potencial para modular la defensa del huésped contra el rotavirus y otros patógenos virales.
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