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Elicitación de la vacuna y base estructural para la protección de anticuerpos contra los alfavirus
Matthew S Sutton1, Sergei Pletnev1, Victoria Callahan2
1Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
Cell
|June 9, 2023
Resumen
Un nuevo anticuerpo provocado por la vacuna, SKT05, proporciona una amplia protección contra múltiples alfavirus, incluido el virus de la encefalitis equina venezolana, al dirigirse a regiones virales conservadas. Este descubrimiento ofrece una estrategia prometedora para desarrollar vacunas efectivas contra el alfavirus.
Área de la Ciencia:
- Virología
- Inmunología
- Vacunas y vacunas
Sus antecedentes:
- Los alfavirus son virus de ARN emergentes que presentan riesgos significativos para la salud pública.
- Las vacunas existentes a menudo se dirigen a cepas específicas de alfavirus, lo que requiere soluciones de amplio espectro.
Objetivo del estudio:
- Identificar anticuerpos ampliamente protectores contra los alfavirus encefálicos.
- Caracterizar la base estructural del reconocimiento amplio del alfavirus por parte de los anticuerpos.
Principales métodos:
- Inmunización de macacos con partículas parecidas a virus de los virus de la encefalitis equina occidental, oriental y venezolana.
- Aislamiento y caracterización de anticuerpos específicos para el virus único y triple.
- Microscopía criolectrónica (Cryo-EM) para el análisis estructural de las interacciones anticuerpo-VLP.
- Estudios de protección in vivo en ratones contra varios desafíos de los alfavirus.
Principales resultados:
- Se identificó un anticuerpo triple específico, SKT05, con una amplia actividad de neutralización contra múltiples alfavirus.
- Cryo-EM reveló que SKT05 se une a los átomos de la columna vertebral conservados cerca del péptido de fusión, acomodando la variabilidad de la secuencia.
- SKT05 demostró protección in vivo contra el virus de la encefalitis equina venezolana, el virus de la chikungunya y el virus del río Ross.
Conclusiones:
- Un solo anticuerpo inducido por la vacuna puede conferir protección contra una amplia gama de alfavirus.
- Dirigirse a los epítopos virales conservados es una estrategia viable para desarrollar vacunas de alfavirus de amplio espectro.
- SKT05 representa un candidato prometedor para futuras intervenciones terapéuticas y profilácticas de los alfavirus.
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