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Replicación de la variante Omicron del SARS-CoV-2 en el bronquio y el pulmón humanos ex vivo
Kenrie P Y Hui1,2, John C W Ho1, Man-Chun Cheung1
1School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
Nature
|February 1, 2022
Resumen
La variante Omicron del SARS-CoV-2 se replica más rápido en los bronquios humanos pero con menos eficiencia en los pulmones en comparación con otras variantes. Esta diferencia en la replicación puede contribuir a Omicron
Área de la Ciencia:
- Virología y Biología Molecular
- Enfermedades infecciosas
- Medicina de las vías respiratorias
Sus antecedentes:
- El surgimiento de variantes de SARS-CoV-2 de preocupación con una mayor transmisibilidad representa una amenaza para la salud mundial.
- La variante Omicron exhibe evasión inmune, pero la causa de su alta transmisibilidad (evasión inmune frente a propiedades intrínsecas) no está clara.
- Comprender las propiedades virológicas específicas de las variantes es crucial para las estrategias de salud pública.
Objetivo del estudio:
- Para comparar la capacidad de replicación y el tropismo celular de las variantes del SARS-CoV-2 (tipo salvaje, D614G, Alpha, Beta, Delta, Omicron).
- Investigar la dependencia de estas variantes en TMPRSS2 y las catepsinas para la entrada celular.
- Para correlacionar los hallazgos in vitro con los patrones de gravedad clínica observados de las variantes del SARS-CoV-2.
Principales métodos:
- Se utilizaron cultivos explantados ex vivo de bronquios y pulmones humanos para evaluar la replicación viral.
- Se analizó el tropismo celular de diferentes variantes del SARS-CoV-2.
- Se evaluó la dependencia de TMPRSS2 y las catepsinas para la entrada viral en cada variante.
Principales resultados:
- La variante Omicron mostró una replicación más rápida en los bronquios, pero una replicación menos eficiente en el parénquima pulmonar en comparación con otras variantes.
- Todas las variantes de preocupación mostraron un tropismo celular similar al virus de tipo salvaje.
- Omicron exhibió una mayor dependencia de las catepsinas para la entrada celular, lo que sugiere una vía de entrada distinta.
Conclusiones:
- El perfil de replicación distintivo de Omicron en las vías respiratorias humanas puede explicar la reducción de la gravedad de la enfermedad observada en estudios epidemiológicos.
- La competencia de replicación diferencial y la dependencia de la catepsina resaltan las características biológicas únicas de la variante Omicron.
- Estos hallazgos proporcionan información biológica que se correlaciona con las observaciones epidemiológicas del comportamiento de la variante SARS-CoV-2.
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