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Published on: March 15, 2019
Evidencia de un superantígeno viral en los seres humanos
M Lafon1, M Lafage, A Martinez-Arends
1Unité de la Rage, Institut Pasteur, Paris, France.
Nature
|August 6, 1992
Resumen
El nucleocápsido del virus de la rabia actúa como un superantígeno, estimulando los linfocitos T. Este hallazgo identifica el primer superantígeno viral humano, que se une a las moléculas HLA clase II.
Área de la Ciencia:
- Inmunología Inmunología.
- Virología Virología.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los superantígenos son toxinas microbianas que activan potentemente los linfocitos T mediante la vinculación cruzada de receptores de células T con moléculas de clase II del CMH.
- Los superantígenos bacterianos causan enfermedades como la intoxicación alimentaria y el síndrome de shock tóxico.
- Los superantígenos virales se conocen en ratones, pero no se han identificado en humanos.
Objetivo del estudio:
- Para identificar y caracterizar un potencial superantígeno viral en humanos.
- Para investigar el papel del nucleocáptido del virus de la rabia en las respuestas inmunes.
Principales métodos:
- Ensayos de unión para evaluar la interacción con las moléculas de HLA clase II.
- Pruebas de proliferación de linfocitos T para evaluar la actividad del superantígeno.
- Análisis del uso de los linfocitos T V beta.
Principales resultados:
- La proteína nucleocapsida del virus de la rabia fue identificada como un superantígeno exógeno.
- Este superantígeno se dirige específicamente a los linfocitos T humanos que expresan secuencias V beta 8.
- El nucleocápsido se une a la cadena alfa de las moléculas de HLA clase II.
Conclusiones:
- El nucleocápsido del virus de la rabia funciona como un superantígeno viral humano.
- Este descubrimiento tiene implicaciones para la comprensión de la patogénesis viral y la activación de células T.
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