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Deficiencia de TLR3 en pacientes con encefalitis del herpes simple
Shen-Ying Zhang1, Emmanuelle Jouanguy, Sophie Ugolini
1Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale (INSERM), U550, Faculty Necker, Paris 75015, France.
Science (New York, N.Y.)
|September 18, 2007
Resumen
Una variante del gen Toll-like receptor 3 (TLR3) causa encefalitis por el virus del herpes simple 1 (HSV-1) en niños. TLR3 es crucial para controlar el HSV-1 en el sistema nervioso central, lo que sugiere la presión evolutiva de los virus neurotrópicos.
Área de la Ciencia:
- Inmunología Inmunología.
- Virología Virología.
- Genética La genética.
Sus antecedentes:
- Se sabe que los receptores Toll y Toll-like (TLR) confieren inmunidad en infecciones experimentales.
- Su papel en la defensa del huésped dentro de los ecosistemas naturales sigue siendo en gran medida no caracterizado.
- La encefalitis por el virus del herpes simple 1 (HSV-1) es una afección neurológica grave.
Objetivo del estudio:
- Investigar el papel del receptor 3 de tipo Toll (TLR3) en la defensa natural del huésped contra las infecciones virales, específicamente el HSV-1.
- Identificar los factores genéticos que contribuyen a la susceptibilidad a la encefalitis por HSV-1.
Principales métodos:
- Análisis genético de niños diagnosticados con encefalitis por HSV-1.
- Análisis de la expresión de TLR3 en el sistema nervioso central (SNC) y las células periféricas.
- Evaluación de las vías independientes de TLR3 en la defensa del huésped.
Principales resultados:
- Se identificó un alelo TLR3 dominante-negativo en niños sanos con encefalitis por HSV-1.
- La expresión de TLR3 en el SNC es esencial para controlar la propagación del HSV-1 desde el epitelio al cerebro a través de los nervios craneales.
- Las células epiteliales y dendríticas utilizan vías independientes de TLR3 para la contención del HSV-1 y la defensa contra otros patógenos en individuos con deficiencia de TLR3.
Conclusiones:
- El TLR3 humano juega un papel redundante en la defensa contra la mayoría de los microbios, pero es vital para la inmunidad natural contra el HSV-1 en el SNC.
- El papel crítico de TLR3 en el control de virus neurotrópicos como el HSV-1 puede haber impulsado su mantenimiento evolutivo.
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