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La eCD4-Ig expresada por AAV proporciona una protección duradera contra múltiples desafíos de SHIV.
Matthew R Gardner1, Lisa M Kattenhorn2, Hema R Kondur1
1Department of Infectious Diseases, The Scripps Research Institute, Jupiter, Florida 33458, USA.
Nature
|February 25, 2015
Resumen
Los vectores del virus adeno-asociado (AAV) que liberan eCD4-Ig, un potente inhibidor de entrada del VIH-1, ofrecen una alternativa potencial a la vacuna. Este enfoque demostró protección en macacos contra el virus de la inmunodeficiencia simio-humana.
Área de la Ciencia:
- Virología Virología.
- Inmunología Inmunología.
- Terapia génica Terapia génica La terapia génica es una terapia genética.
Sus antecedentes:
- Las vacunas convencionales para el virus de la inmunodeficiencia humana tipo 1 (VIH-1) son difíciles de desarrollar.
- Los vectores del virus adeno-asociado (AAV) pueden lograr la expresión a largo plazo de anticuerpos ampliamente neutralizantes (bNAbs) para el VIH-1.
- Los bNAbs existentes muestran una eficacia limitada contra una fracción significativa de los aislados del VIH-1.
Objetivo del estudio:
- Evaluar el potencial de eCD4-Ig, un nuevo inhibidor de entrada, como una alternativa a las vacunas convencionales contra el VIH-1.
- Evaluar la eficacia in vivo y la inmunogenicidad del eCD4-Ig liberado por AAV en un modelo de primate no humano.
Principales métodos:
- Desarrollo de eCD4-Ig, una proteína de fusión que combina CD4-Ig y un sulfopéptido CCR5-mimético.
- Pruebas de neutralización in vitro contra diversos aislamientos del virus del VIH-1, del VIH-2 y del virus de la inmunodeficiencia simiana.
- Estudios in vivo en macacos rhesus utilizando vectores AAV para entregar eCD4-Ig, seguido por el virus de la inmunodeficiencia simio-humana (VIH).
Principales resultados:
- eCD4-Ig demostró una potente y amplia actividad de neutralización contra una amplia gama de aislados del VIH, superando a los bNAbs existentes.
- La expresión mediada por AAV de eCD4-Ig en macacos rhesus se mantuvo durante más de 40 semanas.
- Los macacos que expresan eCD4-Ig estaban protegidos del desafío SHIV-AD8 y mostraron una inmunogenicidad reducida en comparación con los bNAbs.
Conclusiones:
- La eCD4-Ig suministrada por AAV representa una estrategia prometedora para la protección a largo plazo contra la infección por VIH-1.
- Este enfoque de terapia génica podría servir como una vacuna funcional, eludiendo la necesidad de los métodos tradicionales de vacunación.
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