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Repulsión de los viriones superinfectantes: un mecanismo para la rápida propagación del virus
Virginie Doceul1, Michael Hollinshead1, Lonneke van der Linden1
1Department of Virology, Faculty of Medicine, Imperial College London, St Mary's Campus, Norfolk Place, London W2 1PG, UK.
Science (New York, N.Y.)
|January 23, 2010
Resumen
El virus Vaccinia se propaga cuatro veces más rápido de lo que permite su ciclo de replicación. Las células recién infectadas usan proteínas superficiales para repeler los virus entrantes, dirigiéndolos a las células no infectadas para una propagación más rápida.
Área de la Ciencia:
- Virología Virología.
- Biología celular Biología celular.
- La biofísica es la biofísica.
Sus antecedentes:
- Los virus generalmente se propagan a través de la infección, la replicación y la liberación, con una tasa de propagación limitada por la cinética de la replicación.
- La tasa de propagación del virus de la vacuna (VACV) a través de las células huésped parece superar las predicciones basadas únicamente en su ciclo de replicación.
Objetivo del estudio:
- Investigar el mecanismo por el cual el virus de la vacuna logra una rápida propagación de célula a célula.
- Identificar los factores virales responsables de acelerar la diseminación del virus más allá de las tasas de replicación.
Principales métodos:
- Análisis cuantitativo de la dinámica de propagación del virus de la vacuna a través de las monocapas celulares.
- Identificación y caracterización de las proteínas de superficie virales involucradas en la transmisión de célula a célula.
- Prueba para medir las interacciones virión-célula y los fenómenos de repulsión.
Principales resultados:
- El virus Vaccinia se propaga a través de una célula cada 75 minutos, significativamente más rápido de lo que sugiere su cinética de replicación.
- Las células recién infectadas expresan proteínas superficiales (A33 y A36) que repelen activamente los viriones entrantes.
- Este mecanismo de repulsión dirige los viriones superinfectantes hacia las células vecinas no infectadas, mejorando la propagación.
Conclusiones:
- El virus Vaccinia emplea un mecanismo de repulsión activo, mediado por la expresión temprana de las proteínas A33 y A36, para lograr una rápida propagación de célula a célula.
- Este mecanismo permite que los virus se propaguen más rápido de lo que su ciclo de replicación por sí solo permitiría.
- Mecanismos similares de interacción entre virus y huésped pueden impulsar una rápida diseminación en otros sistemas virales.
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